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Such an informative thread, really helping out in planning my LS2 H/C build. Shame all the pictures are broken thought
Hey 05, I have a build going right over on the Corvette forum with a bunch of pictures posted.
Build list
2005 Z51 Corvette with an LS2
Texas Speed 1 7/8 catless headers
Z06 Bimode exhaust
Ported FAST 102mm
Ported Throttle body
Comp cam 230/234 .612/.598 114
I'm adding a set of Tony Mamo 223 Sportsmans heads and Yella Terra Roller Rockers. Also adding some LS7 injectors to support my fueling needs. My previous FAST setup was not ported so I sent it off have it ported.
Actually, it is in the stickies. A long time ago, PatG combined a bunch of stickies into a single thread, likely because the sticky section was getting enormous.
Compression is your friend, especially when running a larger camshaft. Raising static compression will really pump up torque, but so will raising dynamic compression. Every 1 point increase in static compression ratio (SCR) will increase your torque 3-4%. There are limits to how much you can run on pump gas, but you can cheat this limit with tighter quench and better tuning.
For my quest to 500 rwhp, we chose to get static compression into the upper 11s and dynamic compression into the upper 8s. A 57cc chamber coupled with flat top pistons and 2cc valve relief made my compression fairly high for pump gas, but we got some additional help with a .041" head gasket (Fel-Pro 1041). The thin gasket raised our compression from 11.50:1 to 11.92:1 (compared to a stock .053" gasket), but the tighter quench made the motor less prone to detonate at 11.92 than it would at 11.50:1.
The intake valve closing point of 48 degrees ABDC at .050" made my dynamic compression 8.86:1. With the tight quench and outstanding chamber design of the AFR 205 heads, I get 0 knock retard on 93 octane. Ignition timing at peak torque is 28 degrees and 30 degrees at peak hp.
I know this is an old post but great to see you can runca.86 dynamic compression ratio.
I'm wondering what online calculators you used. I use the Wallace Racing calculators for mine.
08-07-2016, 02:01 PM
