2023 ZO6 LT6 engine spec

[lfalzarano]

From the assistant chief engineer who states the LT6 DOHC will produce 670HP at 8400 RPMs!

https://youtu.be/_uta6RWwx7s

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[WARP TEN]

A great video of the engine and a great explanation of how it works. Maybe I didn't hear it, but I don't think Jeremy asked about how they overcome the inherent increased vibration of a flat plane crank engine, something I would like to hear more about. I would bet that cutaway engine cost at least $100,000 if not much more. --Bob

[tpepmeie]

Well, with an 80mm (3.15") stroke, the second order vibration should not be too noticeable. The ford flat plane engine has a 93mm stroke, which is getting up there for such a configuration, so they had to resort to a non-traditional counterweight design (and perhaps firing order?) to mitigate the vibrations.

The LT5 LeMans engine had a 92.4mm flat plane crank, and I'm told it shook pretty bad.

I think 80mm was a great choice by GM for this one. Ferrari F136-type engine in the 430 and 458 were 81mm stroke, and I can personally attest that I never even felt nor cared about any vibrations....

[XfireZ51]

Todd,

The GM FPC avoids the Ford issue due to using the UDUD configuration whereas the Voodoo changed the firing order and needed to add 50# to the counterweights.
Great explanation of what went wrong for Ford found here.

https://www.corvetteforum.com/forums/c8-z06-zr1-eray-zora-discussion/4578271-this-is-how-they-got-to-670-hp-and-they-learned-a-lesson-from-ford.html#post1604219016

Also, I have read that GM will be using their magnetorheological system for the motor mounts.