How Super Knock Can Destroy Modern Engines

What Is Super Knock And How Can LSPI Destroy Turbo Engines?
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New cars are trending towards downsized turbocharged engines using direct injection. While these engines offer better efficiency and fuel economy, this trend has increased the likelihood of engines experiencing destructive super knock, which results from LSPI. Low Speed Pre-Ignition (LSPI) isn’t fully understood, but it can result in knock occurring, potentially destroying pistons, connecting rods, and spark plugs.
Light knock and super knock are different in how they occur in respect to spark plug timing, as super knock can occur without the spark plug ever firing. This video will describe the differences between light knock and super knock, how cylinder pressure is affected by each, how tuning can be used to avoid LSPI, and how motor oil can also be used as a resource to reduce the likelihood of LSPI and subsequent knock occurrences.
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[@lexmaximaguy8788]

knock knock.......who there?? rod bearing 1 2 3 4.....

[@jGRite]

Rod bearing 1 2 3 & 4 who?

[@lexmaximaguy8788]

@@jGRite who who you got a blown engine....

[@sebbonxxsebbon6824]

@@jGRite Rod Bearing moving out from your block.

[@CaptainNero]

Hyundai.....lol

[@boboutelama5748]

Thank you. i had a bad day, and now it's good again.

[@jasonyoung6420]

it's not a problem, it's a feature - free crank inspection windows for everyone!

[@captaincrust2180]

This made my day lol

[@Rhett.Castillo]

As a pro ECU tuner, I see this problem all the time in the newer LT Chevy engines with DI. Especially with aftermarket superchargers. Gotta be very careful tuning these new engines. Great video!

[@mistamaog]

Ouch, one of the engines I hoped it wouldn't happen to

[@karimnasser6710]

do you rempap these engines or do you use tuning chips ?

[@OtisFlint]

@@karimnasser6710 Tuning chips? Is it 1990?

[@ralanham76]

@@OtisFlint it's 1999dec31

[@mrelectron6220]

Rhett Castillo have any of your customers considered a water/methanol system to reduce chances of this problem from what I've read it seems to work well for forced induction.

[@greynolds17]

raindrop, rod knock, there's a hole in your engine block.

[@psnmadracer27]

Knockin on your pistons go pop pop *BANG*

[@straight_intro]

My superknock is bad and boujee, eating up pistons like smoothie

[@MrCwatson3]

Valvedrop, rodknock would be better lol

[@riverkcarolina]

Mazda speed 3 people call this “zoom zoom boom”

[@kx250braap]

@Ungregistered User aren't flat tappet cams/valves used in pretty much every car engine unless u go with a roller setup which is for higher performance?

[@Nevsack63]

Never go full throttle at low revs in an MPS. My tune alleviates most of this by pushing the torque curve towards 4000 to 6000rpm to avoid bending rods

[@RadDadisRad]

So do the ecoboost crowd now too.

[@ofwgthaidgaf]

Facts ive blown 2 motors already

[@edumafra82]

Dude, I'm from Brazil and really like seeing your videos, not only for the great explanations themselves, but to get familiarized with mechanical terms in English. The content presented is always rich, yet in a simple and clear didactics!

[@pedrodossantos5890]

Grande erro, porque eu mesmo já num sei os termos mecânicos em português

[@edumafra82]

@@pedrodossantos5890 E o que tem de errado em alguém que já conhece os termos em português, como no meu caso, querer aprendê-los em inglês? Cada comentário...

[@ianferreiraian]

O canal dele é excelente. O bom é que o inglês dele é bem tranquilo de entender. Alguns canais europeus, com inglês britânico, são bem mais difíceis de entender.

[@edumafra82]

@@ianferreiraian Sim, a pronúncia dele é clara, não é aquela tipo "cachorro roendo osso", emendando palavras. E a didática também é muito simples!

[@mychevysparkevdidntcatchfi1489]

It'd be cool if Project Farm can induce super knock with his see through head engine and slomo guys capture it using high speed camera.

[@RadDadisRad]

It would need to be a gasoline direct injection engine

[@thatguy1919]

Ungregistered User wrong, older engines with larger compression ratios are way more likely to knock

[@sasjadevries]

@Ungregistered User Nope, it doesn't apply to modern engines, it applies to all. It's just that modern engines usually run hotter. And they usually have direct injection which causes deposits. Btw, *here is how to cause preignition and the super duper knock:* (1) Machine your engine parts with a dull endmill, machine as roughly as possible and DON'T deburr. (2) Cause as much carbon deposits as you can; to do that mix oil into your fuel and reduce the pressure of your injection system or use work out injectors to get a crapy fuel mist. (3) Hook up an EGT gauge and tune your engine to run hot. After that your engine should go boom. (unless you blow your headgasket first, XD) Burrs and carbon deposits kinda work like a glow plug: they do get warm by the combustion but they don't get cooled by the cylinder walls. Just think about it: a burr sticking to the side of a block of metal has a relatively high surface area that's contacting with the air around it, but it's connected to the rest of block of metal by a small surface area. Carbon deposits that get on the valves can have the same effect. But with carbon deposits it depends on how porous they are, how smooth they are, etc; not all carbon deposits are equal. The smooth carbon deposits that almost seem to be brushed on won't cause knock as quickly as the rough ones.

[@jarrodheley7879]

If anybody can do it, he can! Love that guy.

[@muimasmacho]

Predetonation = a condition where the engine is trying to compress an explosion. Good luck with that.

[@huntergman8338]

Reminds me of hydrostatic shock.

[@seraphina985]

@@huntergman8338 Reminds me of water hammer also ie the problem that occurs when you try to close a valve on a rapidly flowing pipeline full of fluid in effect trying to arrest it's momentum too suddenly. This can similarly result in failure of the valve and/or the pipeline especially if you try this on a long distance pipeline where you can have literally tons of water in motion suddenly being forced to stop violently the pressure spikes can reach levels that are in the realms of an actual explosive device going off right next to the valve.

[@huntergman8338]

@@seraphina985 Ether way, something will break and it will be expensive.

[@seraphina985]

@@huntergman8338 Indeed, exceeding the rated pressure limits of a vessel is a bad idea however it happens. There is a reason why such limits exist after all once you pass them you are eating through your margin of safety and probably permanently reducing that margin through added metal fatigue too even if you remain short of causing outright catastrophic failure.

[@huntergman8338]

@@seraphina985 Like a fat man at a buffet. That belt gets weaker with every bite.

[@bbkangs]

I don’t always have knock, but when I do... I prefer *SUPERKNOCK*

[@kareem2262]

@bbkangs lmao 😂😂

[@williamparker2922]

I'm dead 😂

[@camarobossman]

Omg Im drying.

[@andrewstout9579]

Great topic this week! Valuable information as always! Thanks for making such detailed videos!

[@myd4980]

Really informative video about a serious topic. Thanks for that 👍

[@atlspeed]

Engine: “This form is Light Knock!” (Spools up) “But this is to go..even further...beyond”..... *Super Knock*

[@nickprocive824]

Que 5 straight episodes of screaming.

[@nap8187]

nick procive revving*

[@bikerman198923]

Look Vegeta it's a pokemon

[@636theofthebeast8]

Wow, mega top quality content as always.

[@lorimills8866]

Love your videos as usual..very informative...keep sharing x

[@ramonpena3011]

How about using a higher octane gasoline??? How about to get the coldest air through the intake that you possibly can set up for??, How about, because it is a turbo engine and direct injection, will assume, by delaying closing the exhaust valve during the intake stroke and also delaying the fuel injection you can evacuate the burned gasses with forced fresh air and lower your chamber temperature???. How about upgrading your intercooler to a better quality that can give you more cooling and a correct amount of flow by the engine set up????.. remember that the manufacturers go the cheapest they can get. I am a great fan, really like your channel but those are questions that I will like to be answered. Keep up the good work. Thanks for being educating us.

[@TheAlapalooza]

Yeah, i was also wondering about running higher octane gasoline.

[@gammalight1312]

With direct injection motors, replacing the cams solves most of the problems

[@perforongo9078]

1) Some manufacturers do use higher octane gasoline. The problem with that is that customers don't like paying for premium gasoline (at least in America). 2) If you kept the exhaust valve open during the intake stroke you wouldn't just be sucking in cold intake air, you'd also suck in the hot exhaust gases you were trying to just get rid of. This method would harm exhaust scavenging, and would make knock worse. 3) Doesn't solve the problem completely, the problem can't just be reduced to putting in colder intake air, it's about preventing local temperature concentrations in the cylinder. The cylinder has to stay at a particular temperature to perform at it's best, just cooling the entire thing down won't solve the problem entirely.

[@gammalight1312]

@Ungregistered User its actually P*C*V it stands for pollution control valve. Its emissions equipment that recycles oil vapor instead of letting it make a mess under the hood or making oil slicks on the streets. Its important but its advised to install a oil catch can between it and the intake system to prevent octane dilution.

[@NBSV1]

@Ungregistered User It stands for Positive Crankcase Ventilation. With old cars they just let the crankcase vent with a tube or basically an open hole. That allowed all the gasses and some oil to escape which made a mess and was bad for the environment. So, modern cars put the crankcase gasses and everything back into the intake. That way everything gets burned and emissions are better. It also means the vacuum of the intake helps pull everything out of the crankcase so it's more efficient.

[@diogov8]

Thanks for the class!

[@jajsamurai]

Its funny that people dont like light knock when that is basically what mazda's sky active engine is designed to do. Spark Controlled Compression Ignition is just using the spark to start ignition and then the increase in pressure causes compression ignition every where else. the only difference I can see between the two is that light engine knock is not consistent and happens in only one location and then propogates instead of being a controlled universal compression ignition. Such a small change can take it from being engine knock, to a super advanced engine technology that you WANT.

[@mrprice8536]

You know that the skyactive X is capable of both compression ignition (like diesels do) and spark ignition as it has spark plugs too. I wonder how reliable and long lasting they will be.

[@jeffbeasley8235]

The SPCCI engines are built to handle the high pressure and temperature that comes with this kind of operation. Kind of like a diesel.

[@XxForJuliusxX]

Good video as always!

[@xeonic84]

Sweet bruh. Thanks for the very informative video.

[@davidmcastaneda1177]

Quite clear explanation and short accurate video!! You've got one more subscriber. I really appreciate that you take your time and draw on the board like that, that makes the videos even more understandable.

[@miguelceja88]

Thanks for a great informative video!

[@john4iraq]

Well explained👌 thank you so much

[@kendavis8647]

I miss the 70s engines that would run on after the ignition was switched off.

[@bikerman198923]

My 71 vw bug with a 2165cc dual 44mm carb would turn if a couple times if hot

[@kendavis8647]

@Addicus Taylor Detonation because of the new emission devices on cars. Also timing was advanced.

[@heh2k]

@Billy Bhanchode Carbon build up.

[@kj9832]

Great explanation as usual 💯

[@graemesears8054]

Excellent explanation and I'll give a different motor oil a try.

[@walterarenas9297]

Oh wow this makes a lot more sense! Thank you!!

[@Misterlikeseverythin]

Lesson - don't go below 3.5k RPM 😂.

[@David-lr2vi]

Misterlikeseverythin. Lesson. Flog the crap out of it! 👍

[@juliansalemme]

Great Video champ

[@burgerbirger2221]

Cool vid😁👍 Didn't know about superknock until i read about the sn plus api-spec.

[@Totone56]

Holly molly, this kind of video is fascinating, i love when you cover this kind of topics

[@georgebonney90]

Thank God another EE video I really needed to learn something today

[@EvgueniPolikarpov]

Cool! Jason, do you have a link by any chance, that talks about the Ca-related LSPI in oils that you mentioned? Would be huge help. Or was it "personal communication"? Thanks!

[@karimnasser6710]

I honestly never seen any report of early engine breakdowns due to "super knock". LSPI is also not the problem of the modern engines like it was mentioned. this type of abnormal combustion is not new, and it can also occure in NA engines with high compression ratios. it is a preignition caused by a hot surface accompanied with knock. cause of knock: a very advanced spark timing(usually spark timing should not be that advanced at low rpm) if you read the reference given below, there are at least 6 types of abnormal combustions, knock can be directly regulated using spark retardation, but for preignition u need to cool the engine temperature down. john B heywood - internal combustion engine fundamentals chapter 9- part 6: Abnormal combustion

[@rohitbauri5958]

Please make a video on suspension Rebound, Compression and Preload.

[@rohitbauri5958]

@@E.Asinus hahaha, it took me a while to understand.

[@mikeyskutako1145]

It's a very good video boss

[@_Webpersona]

Awesome videos! Could you please do a one explaining the mechanics behind head gaskets?

[@victorgonza4528]

good one man

[@wh0019]

Best channel on youtube handsdown

[@coscorrodrift]

Super interesting video! We covered some of this (or something similar) in our Internal Combustion Engines class (the name wasn't Super Knock though 😂) but there was still stuff to be learned, very interesting to see oil manufacturers testing for LSPI. We didn't cover that, or at least I can't recall it right now. To the people reading the comments, this isn't some super dumbed down content by the way, in uni we cover this in a similar way. Amazing to see this type of content on KZbin!

[@agastbody]

Thanks a lot !

[@religionbuster7180]

hi jayson. may i ask the pros and cons of deleting an egr system in diesel engine, theres plenty of vids out there but your explanations is the only one i trust. thank you

[@songofyesterday]

Great video, concerned for my ecoboost mustang now. Too bad I can't use my favorite oil Castrol Edge EP 5W-30 anymore, not API SN Plus.

[@kj9832]

Can we have a video on Mitsubishi Super Select 4WD? It's kinda unique

[@andraslibal]

So even engines have a "normal" size, going much below it brings unwanted consequences. Just like making cars too small has detrimental effect on a lot of things (usability, stability, safety etc)

[@kawrx2002]

It's not quite "the size" of the engine that increases risk of this; it's the cylinder pressure when/as the piston reaches the top of the compression stroke.....it's just that smaller engines typically have higher compression ratios or use forced induction.

[@stuartmolyneux64]

I have an engine susceptible to LSPI. It's a 2016 Vauxhall Astra 1.4 turbo (140ps) - same engine as some Chevy Cruze models. My solutions so far : 1. Use 98 octane fuel (widely available in the UK) 2. Never drive uphill in 4th/5th/6th gear with high throttle load at

[@sampickett3843]

Justin, Are there different fuel formulations or fuel additives that mitigate or prevent super knock?

[@VIDSTORAGE]

I switched to a very expensive motor oil about 6 years ago and it keeps LSPI from happening or does a great job of keeping it at a very low percentage of happening with the low octane fuel by keeping the pistons from over heating ....

[@tjtoobs]

Wow thanks so much! I own a 2016 Jetta 1.4L Turbo and drive spiritually often, this is good to know and I just checked my last oil change the oil was API SN certified, or atleast it said API SN on it, is there a certain label?

[@craigquann]

Hi octane fuel can help as well. Less likely to pre ignite.

[@adriangutierrez9582]

Old comment but E85 solves a lot of issues

[@chrisbouchard4719]

Would the new api rating be a must on high compression performance engines?

[@jasonligo895]

Thank you for explaining this. I would never have imagined that motor oil could be a potential source. Now I understand more about the SN Plus designation. Previously, I always thought the electrode of the spark plug, being long and thin, would not have been able to get rid of heat fast enough and would be the likely source of pre-ignition knock in higher compression engines.

[@jasonligo895]

Now that I think more about the compounds in the oil, it seems the calcium is a catalyst for lower temperature ignition compared to the other metals mentioned such as magnesium?

[@franciscogarfias371]

Can we get a video about colder spark plugs to follow this video

[@JayTdub13]

So if your car is tuned for a higher octane, let’s say 91-93 and you run 87 to be cheap, that would cause light knock or potentially both? Awesome video!

[@JordieG8]

Knock = secondary ignition event after the spark plug fires Pre Ignition = uncontrolled ignition event pre spark plug. Fin

[@JordieG8]

@Ungregistered User no, knock is a secondary ignition point somewhere else in the cylinder that results from the pressure increase after the spark plug fires. You end up with completing flame fronts that accelerate the burn and increase cylinder pressure at an undesirable rate. Pre Ignition is an ignition event prior to the spark plug firing.

[@JordieG8]

That is what I said, A secondary ignition event after the the spark plug or "Primary ignition" event occurs.

[@circuitdotlt]

I had a rod knock. No smoke, good acceleration. Turns out bearings are fine. Piece of piston in the sump. 0.7L turbo charged 80kW engine. Now my second engine is developing the same symptoms - knock originating from wall of middle cylinder (3cyl engine)...

[@TheSPOFARRELL]

Can you do a video on how the Multiair springs in FIAT's 1.4 Multiair engine work and what their purpose is?

[@doneB830]

Nice vid as usual , could you do a video on the reason why Diesel engines exhaust systems don’t rust out like gas engines exhaust

[@twiggy27111976]

Knock and pre-ignition are two totally different things. "Super knock" is pre-ignition and has been an issue with engines for years. Knock is the noise of two flame fronts hitting each other.

[@Roosterism]

Definitely seen way more Ca than Mg in my oil tests, but some of my additives ontop of regular synthetic oils may be introducing more. Though, mine is far from "modern" anymore lol. And definitely not high compression. Using Valvoline FS high mileage as well. Intriguing

[@darrenlomax1283]

Would it be wise to run a new style of engine on super unleaded only?

[@robertshanahan6623]

Good to know about API SN Plus. My parents just bought an Edge with a 2.0T so I'll make sure to recommend it to them. But I guess my Mustang's Coyote engine isn't considered "modern" since it's big, NA, and based on my current tank's MPG of 12, not efficient

[@krunalmule7604]

Please make video on Electric Variable Transmission (EVT).

[@ScatPackRob]

If oil is contributing to super knock, do we need super catch cans or some other method to prevent blow by from reentering the combustion chamber? Great video.

[@paccube]

I'm wondering if this would be a little worse with CVT's, since most scenarios involving high loads at steady state driving would start at very low RPM's. Any thoughts?

[@harrisondalby4419]

Great video!! I am hoping either Jason or someone in the comments can help me wrap my head around another engine related subject, that being how the horsepower formula accounts for the work done by all cylinders in a four stroke engine with 4 cylinders or less. My confusion arises from the fact that there is no power stroke over lap in an in-line 4 cylinder engine. If I understand that the formula HP= (torque x rpm)/5252, and that the torque is the force the crankshaft is experiencing at the particular rpm when the measurement is taken, wouldn’t this only account for the power one cylinder is adding? Again, relating this back to a 4 cylinder having no power-stroke overlap, means that the crank only experiences the torque one cylinder adds to it at a particular time. This is in contrast to engine with more then 4 cylinders where power-stroke overlap occurs. Another way to look at it is that if only one piston is adding force to the crank at a time, what would be the difference of calculating the horsepower of a 4- cylinder and a 2 cylinder ( hypothetically lets say they have the same efficiency,) and each engines per cylinder displacement and stroke are the same. If you ran them both to the same rpm, and took a horsepower measurement would they be the same, since once again only one piston is providing power to the crank at a time, how would the power the other cylinders provide in the same amount of crank rotations be accounted for?

[@fuhdenden]

Please make a video about car body type pros and cons

[@Guitarfollower22]

Brb, gotta check my laundry detergent. Don’t want LSPI in my washer machine.

[@prayformojo1117]

Another factor that doesn't get enough attention is differing fuel quality between markets in North America. ACN (Arizona, California, Nevada) 91 octane fuels are far more knock prone than 91 octane fuels in other states. Same problem in Western Canada where 91/94 behave poorly compared to similar 91/94 in the East. This probably comes down to refinery feedstock, heavy grade oil probably nets a poorer quality gasoline. Our AKI system is prone to refiners juicing RON numbers and leaving MON lower than similar fuels in Europe. AKI is RON+MON/2. Anyone running off the shelf tunes for cars need to ensure the fuel they have in their market is appropriate, not all 91/93s are created equal.

[@pmdinaz]

Is there something to be said for the lack of humidity as to why the change seems more measurable between the regions?

[@prayformojo1117]

@@pmdinaz I think it's mostly regulations, with crude quality being another potential component.

[@2damaxmr2]

Piss poor quality of 91 + octane makes me dont want to tune my car.

[@robertkeefer1552]

Isn't an oil that meets Dexos Gen 2 specs the same as SN Plus?

[@gregorjanos1740]

I have this in my BMW 116i. Since the valve seals are being changed it's a bit better.

[@BuzzaB77]

yup, all the ecoboost Ford fiesta ST's are blowing up over here.

[@FrozenDung]

That's just Ford for you

[@RadDadisRad]

Mikey The new GM LTs are doing it too...

[@gravemind6536]

Ecoboost would be better named Ecoboom. They are god awful engines.

[@autohelix]

I have one and I have not heard anything about this.

[@miroslavmilan]

Yet.

[@tarrencebrooks5004]

Would there be enough pressure in the cylinder from the super knock to cause the spark plug to crack?

[@AD-uw6bd]

Hi Jason, hopefully you scrolled far enough to see my question: Would adding a catch tank/can to the engine potentially reduce engine knock or super knock, due to the fact that it removes part of the oil/fuel mixture that can make its way into the cylinder? Thanks -Adam

[@ianirizarry30]

would magnesium also fill in wear spots?

[@andreaslarsson3999]

Would it be possible to build a scrubber like in diving equipment,and use it to raise the oxygen level in the intake air and ditch the turbo?

[@dns711]

LSPI is probably what caused my 2016 Subaru Forester XT to develop a hole in the engine block around 45,000 miles. Subaru covered a new block, then new heads. I had a brand new 50th Anniversary NA Forester for over 12 weeks. As soon as I got the car back, I sold it to Carmax. I now drive a 2019 RAM 1500 Limited. No more worrying about LSPI. And I can pull my Jeep on a trailer.

[@theicedman]

Did I see you I at mt. Cook like two weeks ago?

[@jirace]

@Engineering Explained If oil in the cylinder is bad for knock then shouldn't rotaries and two stroke piston motors have uncontrolled knock or super knock? Do they?

[@1contrarian]

Does the fuel type make any difference?

[@davidraezer5937]

Pushing the design envelope. All engines are predisposed to pre-ignition. LSPI or super knock is that the new bomb cyclone of the internal combustion engine? Engineering will need to make more robust components to give an adequate design envelope. Also not sure if adding fuel to the mix would compound the LSPI or reside it due to cooling but modern engine management can respond within the combustion cycle especially with direct injection. Cam timing not as quick but also can compensate. Good study and a lot of useful information.

[@jamesjorgensen7608]

Would changing to a heavier weight oil reduce the potential for lspi?

[@vikramb149]

Hi Sir, is it okay to change the gears manually with the gas pedal pressed in an automated manual transmission car? Please advice

[@kevinheckeler]

I'm certain GM's 2.0T LTG engine suffers from this condition. Several 2014+ Buick Regal, 2013+ Cadillac ATS, etc owners have reported failures (cracks) at the top of the pistons, exactly where this condition would cause a fatal issue. It seems to happen regardless of driving style or whether the engine is tuned/modded, and at varying times from 500 miles to 50,000 miles.

[@raghavendrawali3435]

Bro vedio on anti ackerman and it's calculation...please...

[@pkonneker]

So the flammable metal decreases the early flames? Neat!

[@tomgeorge3726]

Hi, Your graph shows super knock happening AFTER spark, but earlier you explained it as occurring before spark (pre-ignition), on the compression stroke.

[@srabik007]

Exactly. Wanted to point it out, but you were quicker :)

[@apw50]

Look at the

[@apw50]

Look at the pressure rise before the spark timing line

[@luisaguilar7311]

Sweet videos, love your work. I have a question though, I drive diesel trucks and my boss just recently bought a 2018 Freightliner M2 with a DD8 ( I believe) motor. According to the manual it says it can go 45,000 miles in between oil changes.. that's crazy!! But what my boss doesn't know is that he can't use the old API for diesel engines instead there was a new revision in 2017 that added API FA-4 . I don't know too much, but it would be cool if you can find out what is causing the higher maintenance intervals. Is it the oil , or is it engine design , or both? Would like to see more videos on diesel trucks. Thanks

[@Mr4512hkj]

I actually work at the assembly plant that builds those m2s. It'd be interesting if it was Mt Holly plant truck because I probably worked on it if so lol. The DD8s are relatively new. I think the new oil and engines are supposed to work together for better efficiency and service intervals.

[@luisaguilar7311]

@@Mr4512hkj whereabouts is that? I'm in the New England area. As I heard they are fairly new. Everyone is surprised how long you can wait for the oil change. Pretty neat ,as long as its reliable.

[@Mr4512hkj]

@@luisaguilar7311 It's near Charlotte NC. The engineers from corporate were in my plant a year or two ago. Making sure we could figure it out. lol

[@luisaguilar7311]

@@Mr4512hkj nice. Do you like working there? Must be a good job. Especially in Freightliner, job security must be good, since all big fleets drive Freightliner

[@4speed3pedals]

This video made me think about Smokey Yunick and his patented flame ignition. Is enough known about how it works mechanically that a video could be made of it?

[@paulalexandre4190]

Hiii what do you think of 2 or 3 spark plugs per cylinder. Does it reduce the probability of super knock _ (DSTI Engine in Bajajs motorcycles engines )

[@jamesplotkin4674]

Super knock occurs before any spark, so you can have a dozen plugs in there and it wouldn't make any difference. Watch the video all the way through. Jason discusses this.

[@rubikfan1]

beside fuel efficientcy. are there any downsides when doing high rpm low load? say when a 5 gear car is doing 130km/h on the highway.

[@fernandoanatomia]

Does using a fuel more resistent to knock, like E85 or E100, help?

[@Namesakes.unit-x-10sq10]

Yes.

[@Lead_Foot]

You answered your own question in the question.

[@3V4NG3L10NN]

Can you please explain why LSPI is most likely to occur at low RPM and high engine loads? I guess at HIGH RPM and high engine loads you also have high pressure and high temperatures?

[@0318paul]

You're channel got me wondering if you could make a video about low power diesel engines. I have a VW Crafter that's putting out a 100hp and 250nm of torque out of a 2.0 litre diesel engine. Why don't they just use a 1.6 TDI Passat engine that makes 120hp and 250nm of torque? Wouldn't this be more efficient? Or is a bigger engine better of the lifespan of it?

[@Iconic_Scarab]

So how does the incresed likelihood of knock and superknock affect engine longevity in modern vehicles. Also on an unrelated note a video discussing the engine oil acidity and its effects over time and what oil companies do to help resist this would be nice.

[@rezandigiga5461]

But can it be used though? I see mazda skyactiv x designed somewhat to have a "knock" and ignition just as piston compress fully at the same time.

[@edl8056]

This is an off topic question but: do vtec engines require 91+ octane gas or can they run on low octane ? Thanks

[@siraff4461]

This is why small turbo engines seem gutless at the low end. It's also why you then wind them up a few more rpm, get them into boost and they drink.

[@dexterjsullen]

But real question, I have a twin turbo v12 2004 but lately my intake temps been high since I have recalibrate my intercooler system my car been throwing codes of random misfire, how bad is that.

[@ianirizarry30]

very

[@InsideOfMyOwnMind]

When you use compression as the crank angle sensor.

[@uguroncel6995]

I believe redlining once a day would keep this problem away 😂

[@craigquann]

Could help reduce carbon buildup in the cylinder... so really your not wrong... but I dont think the cop will buy it!