ZR-1 Net Registry Forums - View Single Post

tpepmeie · 10-27-2021

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....

10-27-2021	#3
tpepmeie Join Date: Aug 2005 Location: Fishers, IN Posts: 786	Re: 2023 ZO6 LT6 engine spec 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.... __________________ Todd ____________________________________ *** our email address has changed! info@pepmeierengines.com pepmeierengines.com Friend us on Facebook too: www.facebook.com/profile.php?id=100011443683384 Pepmeier Engine Development Last edited by tpepmeie; 10-27-2021 at 04:44 PM.