066: Why Domed Pistons are a BAD Idea from an Ilmor Engineer. [

Think you fully understand the high-performance combustion engine? This tech-heavy episode with ‪@IlmorEngineeringLtd‬'s DeWayne Logan might fill in a few knowledge gaps you never even knew you had.
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DeWayne is a calibration and mechanical development engineer for Ilmor, based out of Michigan in the United States. The company has been in the high-performance engine game for a long time now, having supplied engines for the Formula One, NASCAR, and Indycar series.
In this conversation, DeWayne and Tuned In host Andre Simon wade deep into the weeds of high-end race engine development, touching on many different aspects that go into creating something like Ilmor’s 700+hp, 2.2-litre, twin-turbo Indycar V6. Sure, that power figure’s not anything we haven’t seen before, but keep in mind that these engines need to produce that power reliably for hours on end at wide-open throttle in a race situation, and do it for far longer in testing.
DeWayne spends time really breaking down some of the key considerations of engine operation and development, like the relationship between compression ratio, fuel octane, and boost pressure, as well as how to go about selecting the correct compression ratio for a given engine.
Knock, detonation, pre-ignition, and super knock are also broken down and explained, allowing us to fully understand exactly what these conditions are and how they affect the operation of our engine and its durability.
There’s a whole lot of high-protein engine development knowledge to chew on in this episode!
🧰 Learn more about Performance Engine Building by coming along to the next FREE lesson: hpcdmy.co/eby
#highperformanceacademy #learntotune #enginebuilding101 #dontletthesmokeout #wiring101 #dieseltuning #datanerd #gofasterwithdata #racecraft #learndriveoptimise #motorsport #f1 #formula1 #ilmor #indycar #engines #nascar #build #engineer

[@hpa101]

🔥 Get a T-Shirt or Mug by leaving an Apple Podcast review, or even a question! www.hpa-tunedin.com/ If we read out your review at the end of a future episode, get in touch to grab your freebie. Easy 🧠- Taz 🧔🏻

[@rickcupola6262]

It's a breath of fresh air to hear from an engineer from the motorsports field. The perspective on BSFC and combustion speed by the OEM compared to the aftermarket is very insightful.

[@TML34]

I have no idea what you just said or are referring to. 😂 I’ll listen to the podcast now.

[@Kj16V]

😂​@@TML34

[@Scott-to8ri]

Different goals

[@lukeh5725]

Andre has a great ability to explain the technical/academic speak in plain English without being condescending to the guest or viewers.

[@martinrodger9565]

Another phenomenal session. Andre facilitates these guests to project so well. Dewayne is a great speaker.

[@rogercaddell4407]

I really enjoyed this podcast, technical topics were discussed in ways that made them understandable. Thank you.

[@hpa101]

Our pleasure! So happy you enjoyed it and cheers for the support 😎 - Taz.

[@brianbob7514]

Love hearing from these Motorsport engineers

[@bigbothoee8617]

This is insane awesome info I've worked for oems I've found that I've learned more in the tuner industry, Thanks for this made my day

[@neelsvanniekerk1807]

This is so good. Enjoyed having a number of things confirmed and some trashed in a professional and respectful manner. I have followed Dewayne on SpeedTalk and he is a fountain of knowledge.

[@coollee303]

These podcasts are 🔥. I look forward to every one

[@MafiaboysWorld]

So you're saying I _can't_ have 17:1 CR and next to 0 CFM of flow. 🤣👍

[@magnusdanielsson2749]

This was a very interesting episode. Very interesting insights presented.

[@Vehicular.Shenanigans]

24:03 the m139 in s trim makes 2.1 bar (30 psi) of boost, Which is a lot for pump gas. Especially to do reliably all day.

[@squirmish70]

I think the new version in the new C63 makes even more.

[@Vehicular.Shenanigans]

@@squirmish70 the m177 only makes about 20! Lots of potential in that motor

[@jdoe9518]

Atmospheric pressure is 1 bar (14.7 psi) so it depends where the "boost" is measured before it can be determined if a figure is a "lot" for a certain fuel.

[@Vehicular.Shenanigans]

@@jdoe9518 when you say boost it’s assumed you’re talking about psig not psia

[@jdoe9518]

@@Vehicular.Shenanigans no one should ever assume and didn't specify.

[@michelhadid]

Thanks for this episode!

[@sexyfacenation]

Thanks. Cooked my brain now I will have a sleep! Great stuff bro

[@bernardwarr4187]

I think if I can add to the chat, one of the highlights for Ilmor, was the Roger Penske, Ilmor Mercedes 1994 wins, at the Indy 500, if not slightly controversial. Would be interested to know more about Ilmors involvement with the Mercedes CLK Gtrs. They built and converted some of the M120 v12s but all so I believe they made some V8 engines for the program?

[@champ0682]

Loved this session. Amazing insight into those minds of the OEMs. Are there any rotary guys at ilmor ?

[@ttamn92]

Also I had never seen or worked with in cylinder pressure sensors until I worked at the R&D division of an OEM and talk about a whole world being opened up in front of me lol.. I was introduced to so many tools and techniques during my time working on contract with them and I would have loved to continue that but I was at a point where I needed a bit more stability and even though it never happened to me I had seen contracts get terminated at no fault of the worker but boom just like that they were no longer working there and sometimes they would be back working on a different contract or something but I couldn't have that happen to me and I also realized that even though my contract was a long term contract and had no set end date I was just nervous I guess just buying a house and having a baby but I did absolutely love that job

[@aussi3212]

I wonder what engine combo Dwayne's mustang has, hopefully not a ilmore LS

[@denisbassom172]

Interesting one, thanks.

[@ttamn92]

This is very interesting to me because I have had very good results using pistons with a small dome and higher compression than most consider good compression ratio for a boosted engine but I decided to try a few things to see what happens and this was in a 4g63 engine and I had a good relationship with cp pistons and together with an engineer I knew that works for CP designed a piston that would have close to 12:1-12.2:1 compression ratio and I had to change the cams I had been using for a set of Kelford cams that would have slightly less valve lift just because it ended up being very tight in the cylinder..but the camshafts were also a large improvement I'm sure but I was able to get up on boost almost 1200 rpm earlier and had a much flatter torque curve than before...we made a bit over 90ish more HP on the dyno and 110ish more torque... again I'm sure the better cams helped achieve this but it was a much smoother and overall less "peaky" run ..we were able to run less boost but still had similer cylinder pressures Now this was just something I was curious about and wanted to play around with when I was trying it and I never had the track record or experience with that setup to try to build something like that for a customer but I'm curious what would have happened if I had not changed my racecar and ran that setup for a few years to see what the problem areas might have been But I am very interested in why I had such good results and I know a few others that are going to higher compression ratios on boosted engines and also having mostly positive results.... I'm always trying to learn especially when it's something that I was thinking worked differently or whatnot

[@customzdream]

Makes me sad that electric power vehicles are moving in considering how mind blowing these engineers have the air pumps operating . Such knowledge will one day be not needed. Great listen. 👍

[@hpa101]

Did you listen to the Hannah Westbrook podcast? At the end she gives her opinion that bio fuels will see ICE engines live on in motorsport for a long time yet. Motorsport usually leads consumer vehicle tech if that's also anything to go by. All just speculation of course although F1 certainly is committed to ICE in some form for the foreseeable future 😎 - Taz

[@customzdream]

@@hpa101 have not heard that podcast but will get on it. Love listening to your podcast as I work on my car In the shed. I call it going to school .lol

[@hpa101]

Hahaha good man! Even Andre is learning from these guests. There is just so much knowledge out there to absorb and a pleasure to be a part of bringing a bit your way 😎 - Taz

[@IcanDriveIt]

EVs are an agenda driven fad pushed by the leaders of today, the WEF. The process leading to the end state of mass produced EVs is a luxury and benefit of globalization, which COVID and the Ukraine war have done a sufficient job of killing. Regional markets are more reliable and if you live in the US like me, we do not produce the minerals needed for EVs in this region of the globe. We are heavily reliant on the Congo and China. If we see China invade Taiwan, the subsequent sanctions will kill any hope of mass market EVs for a generation. Our leaders need to realize that internal combustion is not going away, and that fuels can be burned cleaner. Cleaner fuels have yet to be explored. Remember, before the 1980s, natural gas was considered useless. Times and means change.

[@bigbothoee8617]

Lolol he got a dino in his garage home garage mission complete in my eyes really inspiring love this pod

[@hpa101]

Life goals right! - Taz.

[@moraescarlosalberto6381]

Boa tarde ótimo o vídeo estão de parabéns

[@nord.tuning]

Great podcast. I always listen to it when i drive to work, a great source of information. Although the story about detonation and colliding flame fronts made me raise my eyebrows. Here's how David Vizard explains it: kzbin.info/www/bejne/o36kiHmhlq16i8k

[@laurean5998]

Same. There was no mention of detonation. There should have been mention of the differences between deflagration and detonation. Detonations concentrate mass on their very thin supersonic propagation front, causing extreme pressue spikes, which are able to break fragile areas like ringlands and create a pinging sound. They also stir up boundry layers, which will lead to much higher heat transfer in addition to the higher temperatures due to the extreme pressure. Even if he claimed there was no detonation during a knock event he should have explicitly said that to prevent confusion.

[@laurean5998]

Also there is a clear analogy to the diesel combustion process and the diesel knocking

[@Velocitist]

26:41

[@zacharymorris9917]

What book did he say to read?

[@squirmish70]

Internal Combustion Engine Fundamentals - Heywood

[@zacharymorris9917]

@@squirmish70 thank you!

[@LuckyFruitRacing]

It was mildly amusing to see that the term "gas" being slang for "gasoline" has become so entrenched in American language that your reference to the boundary layer of "gas" across the piston, went over his head. Great episode mind you!

[@squirmish70]

It didn't. Just...hadn't encountered it.

[@11ride4life]

No he understands what a liquid, solid and gas is he refers to exhaust gas in his answer.. Try again to make us look dumb just because we come from the most influential and powerful country in the world.. Take a bath in petrol you tard..

[@LuckyFruitRacing]

@@11ride4life what the fuck are you talking about? I thought it was an amusing misunderstanding of language. There's no need to be a complete cunt. Check yourself.

[@uwu3130]

nice :3

[@mbalunovic]

Mercedes wont put out an engine on its very edge.. The same Mercedes - SLR MClaren had an engine replacement interval set at 60oookm. yes, you read it correctly. Not service but a full engine replacement at 60ooo km.... funny fact is Mercedes has been "throned" the worst by the reliability by Forbes..

[@ilham7345]

more like doomed piston