GM's LT1 Engine Explained

GM Powertrain engineer John Rydzewski explains many of the features in the 2014 LT1 Corvette engine, including direct injection, continuous variable valve control, the rotating assembly, engine block, intake manifold, 11.5:1 compression ratio, and combustion system.

[@creepycrawler4690]

It took me a minute to figure out, this is not the same Lt1 engine I have in my 95 z28 like I was expecting this video to be.

[@justinmilby4552]

Nor is it an original lt1 350 from 1970 high performance gm cars. They have a gen 1, gen 2, and gen 5 engines named lt1. All them are unique but share same name.

[@35057]

Toby Dog the only similarities they share to the old SBCs are the 4.4” bore spacing.

[@The_Drive_Inside]

What a great video.... very very informative. Thank you for posting this 👍🏻👍🏻👍🏻

[@redmunkee]

"What is it in inches? You're not Canadian are you?" I LOLed at that, but in all fairness, he's an engineer. So of course he's accustomed to the scientifically superior metric standard of measurement.

[@driver1823]

Canada is metric has been for long time

[@Dezmo888]

and all this literally seconds after he asks a question using a metric measurment.

[@johnnytooby9980]

Maybe in your description note the lt1 designation for year seeing the 91-96 lt1 cars!

[@rondail5675]

Great review! Makes me love my engine in my 2017 Corvettte. Is using a Range AFM Disabler good or bad for the longevity of the engine? Thoughts?

[@revolutionday1]

Seems like he'd be a good guy to have a beer with.

[@bentrishaleemartin926]

I love the lt1 in my 17 vette.

[@JETZcorp]

I'm not really a Chevy guy, but this is pretty sweet. I'd be curious to know what kind of CFM we're looking at on the heads, and how that compares to the 392 Hemis. The general consensus I've heard is that Hemis tend to have big head flow and the LS have invincible bottom-ends, relatively speaking. I wonder how true that is, and how that might change with the LT1.

[@5571350M8]

That's engineering without cost effectiveness. They could make an LT1 with light, expensive, forged alloys, but it would have to cost a lot more. This is a $53k starting price car meant for all to have.

[@w41duvernay]

How long will it take GM performance to come out with a header flange for this engine?

[@zulizin]

Wow, hard to understand the hate that people are projecting on this thing. The 1LR-GUE that is being touted down below is a Yamaha-Toyota co-developed engine that comes in a $350,000 base price car. It makes less torque at 6,800 RPM than the Gen V LT1 makes at 1,500 RPM and revs to 9,500 in order to make it's power which caused a need for unnecessarily expensive materials in the construction of the engine. You're comparing a car that the everyday man will not have the chance to drive, let alone buy in his natural lifetime to a car that is readily available for the middle class man. Then the people projecting lots of hate that a 455 pre-emissions standards by the government could produce the same torque numbers years ago. There are rules, and regulations put on car manufacturers by the government which makes it necessary to incorporate things in order to not only meet said emissions laws but by some feat of engineering meet horsepower expectations from people who want more horsepower than they can apply to the road themselves, street or track. If you could do it better why don't you? If you can make a RELIABLE engine make more horsepower and meet emissions standards then you need to quit your day job(if you even have one) and go get paid to engineer new engines for your choice of manufacturer.

[@howabouthetruth2157]

+zulizin Very well said zulizin..........I couldn't have said it better myself.

[@kevin122759]

The new LT1 is no joke. My daughter has a 2016 Camaro ss with aftermarket cam, headers and tune and has been dynoed at 510 hp and 510 torque at the wheels. She is running a 11.0 quarter mile at 125 mph. Now she wants forced induction. My LS2 with the same power adders is putting out 100 hp less to the wheels.

[@professorh8398]

Dropping one into my Honda Fit, tomorrow. Should be a breeze.

[@ConcernSpirit]

Tears want this for my 97 ws6

[@RobertSmith-le8wp]

Replace the LT1 with an LT1

[@nedaCFilms]

Third LT1 design... why not RPO code it the LT6?

[@fjmiv13]

no it wasn't in the video, but if you look at the complete engine the first thing you'll notice is the alternator is on the left side and not the right side

[@victorrodriguez8917]

It's the L83 5.3 identical ????

[@SHADOWBLACKs650]

Nasty little engine. ... Awsome

[@THEFALLOFSONY]

GM makes the best motors

[@adamdrury9677]

THANK YOU! I've been searching everywhere to find out if the lt block is all new or a version of the ls. Nobody is talking about whether or not this is completely new block or similar to ls.

[@hirthirthirt1693]

why are those intake-ports are still not polished? There is no gasoline in the ports anymore because of the injection so they could be shine as hell, right?

[@kyleallen3857]

Hirthirt hirt That’s contrary to what the science says It has to do with a barrier layer of air that actually improves flow, over a mirror polished surface

[@FGCTekken]

Does this new gen 5 LT1 have the same engine mount points as a gen 4 LS3?

[@madtownmadman]

From what the engineer said, it seems that the mounting points on the gen V motors are a bit different than the gen III and IV.

[@FGCTekken]

Alright. Thanks for the response.

[@MatthewQuinton]

the engine mounts are about 1/2 inch wider so if you have adjustable ls mounts they will work

[@cadillac718bx36]

Everyone knows in this world that GM can build one bad ass v8 wheather like them or not, all these engines root back to corvette racing which is very succesful in wins compared to other manufacturers, plus the amount of testing and analyzing and time spent on these v8 engines are great attributes to building a reliable durable engine

[@megavettes]

Gonna make a good fit to replace my old lt1 in my 1995 trans am

[@ChuckBeefOG]

+megavettes Buy an LS, they are half the price with a much larger aftermarket.

[@alexalanis8077]

we got the 4.3l v6 in the 2014 shop truck. Essentially a 3/4 lt1. It's got balls. more than the 4.8l and even a 5.3l we got. Tell me your bringing the Syclone and Typhoon back with a turbo 4.3l.

[@kevin122759]

4.3 V6???? My neighbor has one in his pickup and I raced him with my 4.2 inline 6 in my trailblazer and I ran off and left him. Perhaps having dual overhead cams makes a big difference.

[@johnbeer5242]

Alex Alanis its not stock is it

[@johnbeer5242]

2014 ? does it have more balls than 2014 5.3 ?.🤔

[@robsonrissotrainer]

the problem with direct injection is the amount of carbon it builds up on the intake valve, i dont like this fact

[@slightly85]

Do you happen to know where the carbon would be coming from? Since the DI engines are more emissions friendly than those engines of yesteryear, there is no need for an EGR valve anymore, therefore you don't have the same carbon coming into your intake like on previous engine designs, the only real issue is PCV, but that is minor.

[@robsonrissotrainer]

+slightly85 ohh cool because im about to get a c7 for now, what is this pcv?

[@slightly85]

positive crankcase ventilation, google is a wonderful thing. Vents off any blow by from the pistons into the crankcase.

[@robsonrissotrainer]

slightly85 wow its sounds great, thanks for answering, i will check it out

[@drwombat]

+slightly85 the carbon comes primarily from deposits left on the back or under side of the valve from the air fuel mixture add the pcv fumes in the mix and you get a carbon problem as early as 50k

[@MotaDrives]

Onwed threw 5th gen lt1s. Crank went at 1800 along with bearings and lifters.

[@danielmillard8134]

Those intake runners need porting! lol

[@GearheadGarden]

Interesting although the vid is 2 years old now. I wonder if they went forward with it. One thing that always makes me worry with a new engine design, however, is what's the first thing that's going to need to be re-enginnered. There's an awful lot of solenoid, pumps, etc in this motor which makes it pretty much disposable and repairs expensive. I always feel better when the inside of the motor is kept simple.

[@Closeoutracer]

+El Camino Guy Agree.. Looks to me like they are leaving the sphere of good judgement in favor of going over-techno while making rebuilding this engine not economically possible. Dead engine in 8 years and too expensive to rebuild. VVT isn't all that, never was.. people get all wrapped up in technocrap because some engineer tells a great story and forgets the benefit bottom line.

[@MICKSHRED]

@@Closeoutracer its has CVVT continuous variable valve timing.

[@MICKSHRED]

Do you live under a rock

[@TheBikemaster94]

yea nikka

[@kramerroberts549]

Can i swap out my LS3 and install an LT1?

[@alphagaming9004]

KRAMER ROBERTS why would you?

[@jdburge17]

the rebirth of the dead legend lt1 lives

[@JohnnyAnderson1]

why did they call this a lt1???

[@om1513]

my question is why didn't they make direct injection years ago since diesel engine have been running that way for decades knowing how efficient those engines are and long lasting. As a HD Diesel Mechanic I jus think it would of made more sense years ago.

[@gsnuf2]

very true sir

[@kabloosh699]

Direction injection prevents the valves from being cleaned so they end up with carbon build up. Dual injected engines will solve that but direct injection only engines may require cleaning of the valves every so often.

[@JohnnyAnderson1]

I must have missed all that????

[@javiercremades4221]

Cylinders steel o nikasil?

[@kyleallen3857]

Javier Cremades Aluminum Block with Steel cylinder sleeves

[@linoacuna7230]

how old is the lt1 now.everyone is into the ls1 and so on

[@Dr_Xyzt]

Don't confuse the new LT1 with the old one from the 90's. This is an all new engine.

[@linoacuna7230]

So they brought back the lt1 is what u saying.because am only families with the ones that came in the camaros and firebirds

[@linoacuna7230]

What new cars have the new lt1s ??

[@Dr_Xyzt]

The new design is on every 5.3 and 6.2, 2014 and up. Silverados, Sierras, Corvettes. The 2016 camaros have the 6.2's.

[@Dr_Xyzt]

Yeah. The new engine, in the grand scheme of things, is LS based. They've simply named it "LT1" and it's more or less a decent remodel of the LS. This is likely the second to last generation of Pushrod V8's we're ever going to see.

[@cesarconh895]

So this engine is based pretty much on the ls7?

[@cjpp78ytube]

Or you could just compare the 5.0L toyota v8 in the current ISF sport sedan. 5.0L 416hp vs LT1 6.2L 450hp

[@highlanderc]

I'm dizzy....

[@jetman1027]

Got to be honest here.... most people are keeping cars longer and driving them longer with that thought.... the mileage is usually a lot higher.... I believe they are out tricking themselves and therefore with all these moving components they will not last making the reliability factor decrease. My belief is KISS... Thanks

[@fjmiv13]

cuz it went back to the LT1 design, its flipped from the LS series

[@aboutmyfathersbusiness8324]

VVT scares me. Id be changing the oil every 2k...

[@kyleallen3857]

AboutMy FathersBusiness It’s the AFM/DOD that should really scare you

[@snake3276120]

Engineers use metric units during design and calculation not imperial

[@1969gorilla]

Let's also not forget the LFA costs half a million dollars....nearly the equivalent of ten new Corvettes. Thanks but no thanks.

[@JBWHITEGT]

i wonder if GM has fixed all there oil leaks along with there electrical problems???

[@deanlutgert8292]

The camera man was making me sea sick with his constant zooming in and out what was wrong with the old motor looks like a big waist of money

[@Shadow0fd3ath24]

Afm wouldn't be necessary with a good tune from the factory meant for 87 oct

[@brandenmiller3148]

Soo I can just swap this lt1 straight into my 94 z28 right? Hahaha

[@bigredracer7848]

What did you designed to protect the computer in the hall this from an EMP pulse are you just hoping that everything fails and then nobody can go anywhere is that why you're building these cars not to withstand an EMP blast

[@V8Supercar1]

6.2L = 378 cubic inches

[@matrox]

I hope the presenter knew it was a 376ci.

[@cjpp78ytube]

Well wait till the next supra comes out if you want engineering comparison in this price range. Rumors of 2014 being when it returns.

[@RobertSmith-le8wp]

I’ll take my ‘05 Silverado with its very simple 5.3 LS engine. The later LS and LT engines have become WAAAAAY to complex with variable valve timing and displacement on demand. Mine has well over 300,000 miles with the only thing ever needing replaced is the water pump which I was able to do myself for around $100 and less than an hour. I’ve heard way too many horror stories with collapsed lifters and engine ticking. A cam in block engine is supposed to be simple, not complex like this. The 1999-2006 were the best engines ever made. I suppose you can’t expect a good thing to last forever

[@cjpp78ytube]

the car is a limited edition vehicle, only 500 in the world. The 4.8L makes 550hp not 100. No carbon fiber?lol The whole car is made of carbon fiber. Its the only car in the world with a carbon fiber woven chassis. woven on the only looms in the world that can do it , owned by toyota. best part is the car sounds exactky like a f1 car. no comparison to this thing but you was talking engineering

[@cjpp78ytube]

oh and torque doesnt win races. if it did the new vette would be faster than LFA but it wont be.

[@Closeoutracer]

Stop using the LT1 name for the love of God... give new things new names. This is the 3rd time the LT1 moniker has been used. Boring, redundant, trying to appeal to the lowest hanging (not paying attention) fruit from a marketing perspective.

[@GlycerinZ]

Yeah they already used it in the 90s. Why would they use the same name? At least call it LT2. I clicked on this thinking it had to do with the 90s LT1.

[@sancharino6878]

And 1970

[@sdcoinshooter]

Closeoutracer I agree, I clicked on this believing it was an explanation of the engine in my 95 Vette. NOPE

[@Zerobudget2000]

Umm... name a sportbike that comes from the factory with a compression ratio greater than 13:1..... usually they dont exceed 13:1 because it causes detonation of pump gas... and most crankshafts are steel... even on sportbikes...

[@dnsean03]

prob expensive to mod.. screw that I'll stick with ls1

[@Viages]

Very cool , but a shitty design too many problems with the injectors , valve springs, lifters and so on.

[@TAWS-wq3hx]

And finally GM makes an actual good and useful move in this design with headaches. The original and guaranteed MECHANICAL fuel pump. Ild love to meet the idiot who came up with the concept of an intank electic fuel pump. Failure prone from the getgo.

[@oscrthgrch7]

Putting a fuel pump in the tank cools it, and helps muffle the noise. Yes, it makes it a pain to work on, but there are sound reasons for doing it.

[@Rob749s]

+96TAWS6455 What's this electricity thing? It can't be reliable, I can't even see it!

[@glennmanchester1568]

They last a very very long time and are very reliable as a rule if you dont run them out of. Gas often

[@1974cobramustang]

IT'S ALL about the $$$$$$

[@cjpp78ytube]

lol take one look at the Lexus LFA if you want an example of Toyota engineering. How about a 4.8L engine that makes a 100 more horsepower than this new 6.something liter Lt1. The toyota engine also revs to 9,000rpm and can do it faster than a mechanical tachometer can read. Its also a v10 the physical size of a dohc v6. I think thats engineering.

[@sportsmansparadice42]

I really hope this motor puts out more than 450HP from a 6.2 liter. If not that's weak sauce.. The Porsche GT3 4.0 liter with 12.6:1 compression that puts out 500HP all motor. No turbos, No supercharger just a small 4.0 liter producing 125hp per iter

[@johnjames5020]

That sounds good on paper, but look at all the specs. You have to turn 8250 rpms to get that HP (longevity?) and it only makes 339 ft lbs of torque. At 6000 rpms! Fun on the track. Nothing great for a street motor. MPG isn't impressive either. 17 combined. Also stop looking at engine size vs hp. Power to engine weight is the better metric. Just noticed your profile picture is of a Corvette/LT1. LOL.

[@1991tommygun]

So basically its a bunch of bullshit slapped on an ls engine, more junk to go wrong, i deleted cam phazers and all that vct bullshit on my modular ford engine for a reason!

[@kyleallen3857]

1991tommygun Blame the Liberals and their Climate Protection Policies If we keep electing Democrats, eventually there will be no such thing as a Muscle Car

[@1991tommygun]

Kyle Allen ur not wrong!

[@jaydenchen9172]

that is stupid emgine design! AFM system make a lot driver have cam and lifter problem

[@kyleallen3857]

Jayden chen Blame the Liberals and their Climate Protection Policies If we keep electing Democrats, eventually there will be no sick thing as a Muscle Car

[@0311campbelljk]

Who cares about fuel economy when you by a corvette.

[@georgewashington938]

blah blah blah

[@yordybenitez4125]

Corvette cars are becoming the worst when it comes to reliability. Not to mention the engines; two of them have to be replaced at only 6000 miles. What a joke.