engine compression 11-1 vs 93 octane
Thread Starter
12 Second Club
Joined: Mar 2005
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From: Corpus Christi
engine compression 11-1 vs 93 octane planning on installing patriot heads 2.05"/1.59"/59cc/11-1 compression what do I need to be worried about as far as high compression is involved?what do u guys recommend compression wise, will 93 octane be enough and what about detonation? will pcm re-programing help here? I will have engine dyno tune when head/cam swap. (tsp 231/237-.598/595 112lsa) bottom end stock
Thanks
fuerzaws6
Thanks
fuerzaws6
The static compression is not as much of an issue for detonation as is DYNAMIC compression. The cam specs and installed intake centerline determine this. The more you advance the cam, the earlier you close the intake valve. Earlier intake valve closings build more cylinder pressure (as a general rule). A cam like the TSP 231/237 112LSA has lots of overlap and might be more octane tolerant than a TR 224/224 112LSA (+4) cam would be. The Thunder Cam builds more cylinder pressure and might be more prone to detonate.
Bottom line, with a good tune, your life with 11 to 1 and the TSP cam should be as carefree as the strock cam with 10 to 1.
Bottom line, with a good tune, your life with 11 to 1 and the TSP cam should be as carefree as the strock cam with 10 to 1.
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Thread Starter
12 Second Club
Joined: Mar 2005
Posts: 1,498
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From: Corpus Christi
thanks guys for reply. I'm going with 11-1 comp. now, what hp should I be getting with this set-up? all stock except hooker headers lt on y-pipe w/ borla cat-back , slp lid. I know other factors play on this so just wanting ballpark figure.
Thanks
fuerzaws6
Thanks
fuerzaws6
TECH Resident
Joined: Aug 2004
Posts: 875
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From: Portland Oregon
I'm about 11.5:1 and ran this new motor with half a tank of race fuel and half unleaded. Never had a knock until I filled up with unleaded two times no race fuel. That is with a stock timing tune at over 2000. So I think that at 11 you are safe, but close to a knock.
Just don't advance your timing. Leave the low octane knock table active.
Just don't advance your timing. Leave the low octane knock table active.
