LT6 / C8 Z06 engine - Page 2 - ZR-1 Net Registry Forums

tpepmeie · 10-28-2021

The more I learn about this engine, the more blown away I become. I can't find a single design where they compromised. This could pass for a full blown race engine, but with a warranty and emissions compliant! Can we get an LT5 to the same performance, HP/Liter or BMEP? Yes, but the expense would be nuts AND the cams would be way too radical to pass any kind of emissions test.

I've read the valves are 42mm inlet/35mm exhaust. Thats a lot of valve area for a 4.100" bore (32.5%), again straight out of modern 4-valve race engines.

It make you wonder how one might improve on this beast. The ONLY area I see is bigger more aggressive cams, and run the engine speed higher. At 8400, it is only running to ~4400 ft/min piston speed. Taking that out to 4700 or 4800 ft/min, as long as you keep the efficiency up would be around 9000 rpm! There is enough valve area to keep the gas speeds reasonable. Could give another 50hp at the same 13.07 bar BMEP. That's about it!

So much want....

XfireZ51 · 10-28-2021

Todd,

Did u catch that they moved the injectors to the exhaust side of the chamber? Giving them more space for bigger valves, which they needed due to the 110%VE
they were getting. The science in this motor is simply amazing.
What about the windage system in the crankcase? 😵*💫

10-28-2021	#11
tpepmeie Join Date: Aug 2005 Location: Fishers, IN Posts: 775	Re: LT6 / C8 Z06 engine The more I learn about this engine, the more blown away I become. I can't find a single design where they compromised. This could pass for a full blown race engine, but with a warranty and emissions compliant! Can we get an LT5 to the same performance, HP/Liter or BMEP? Yes, but the expense would be nuts AND the cams would be way too radical to pass any kind of emissions test. I've read the valves are 42mm inlet/35mm exhaust. Thats a lot of valve area for a 4.100" bore (32.5%), again straight out of modern 4-valve race engines. It make you wonder how one might improve on this beast. The ONLY area I see is bigger more aggressive cams, and run the engine speed higher. At 8400, it is only running to ~4400 ft/min piston speed. Taking that out to 4700 or 4800 ft/min, as long as you keep the efficiency up would be around 9000 rpm! There is enough valve area to keep the gas speeds reasonable. Could give another 50hp at the same 13.07 bar BMEP. That's about it! So much want.... __________________ Todd ____________________________________ [SIGPIC][/SIGPIC] [email]pepmeierengines@yahoo.com[/email] [URL="http://toddpepmeier.wix.com/pepmeierengines"]visit our website[/URL] [URL="http://pepmeierenginedevelopment.blogspot.com/"]Blog[/URL] Friend us on Facebook too: [url="https://www.facebook.com/profile.php?id=100011443683384"] Pepmeier Engine Development[/url]

10-28-2021	#12
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,661	Re: LT6 / C8 Z06 engine Todd, Did u catch that they moved the injectors to the exhaust side of the chamber? Giving them more space for bigger valves, which they needed due to the 110%VE they were getting. The science in this motor is simply amazing. What about the windage system in the crankcase? 😵💫 __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX Last edited by XfireZ51; 10-28-2021 at 10:06 PM.*