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#1 |
![]() Join Date: Feb 2011
Location: Clayton, North Carolina
Posts: 1,133
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From the assistant chief engineer who states the LT6 DOHC will produce 670HP at 8400 RPMs!
https://youtu.be/_uta6RWwx7s Image1635277788.081125.jpg IMG_4568.jpg Sent from my iPhone using ZR-1 Net Registry
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Lou[COLOR="Red"][B][SIZE="4"][/SIZE][/B][/COLOR] Last edited by lfalzarano; 10-26-2021 at 03:50 PM. |
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#2 |
![]() Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,063
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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
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2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" |
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#3 |
Join Date: Aug 2005
Location: Fishers, IN
Posts: 809
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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....
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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. |
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#4 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,696
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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...post1604219016 Also, I have read that GM will be using their magnetorheological system for the motor mounts.
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