Do I have a good combo?
03-14-2012, 05:54 PM
#1
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Do I have a good combo? I will make this short I have a 02 LS1 6spd. It is stock bore and stroke it currently has all the boltons, 3.90 gear, 100 shot, and a 224R cam. I have on order a set of PRC 5.3 2.5 heads milled to 61cc. I am guessing my CR will be 11.1 using factory GM headgaskets. My question being is there anything little thing I can change that would improve my combo to make more power. I don not however want to change the cam or up the size shot of nitrous. Thanks guys for your knowledege. I'm sure you all know alot more than I do.
03-14-2012, 06:17 PM
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Yeah I am worried about getting the compression to high for a true street car that will only ever see 93 octane. Thats why I went with factory thickness head gaskets.This "quench" what is that and not having a good quench be a bad thing for me? Thanks for your reply.
03-14-2012, 07:17 PM
#4
Sorry, I tool this from a Honda site, but explains it pretty good. You want to try and get your quench zone to around .035". More area and you run more of a chance of getting detonation, and less you run the risk of having the piston getting close and "kissing" the head
Quench zones promote more complete burning and reduce the likeliness of detonation by increasing turbulence of the fuel air mixture as the piston comes to TDC by squishing the fuel air mixture toward the sparkplug and away from the end zones of the combustion chamber. This reduces the amount of fuel-air mixture near the ends of the combustion chamber where it does not completely burn (thus being wasted) by pushing or squishing it toward the centrally located sparkplug where it can easily be ignited. When heads have additional quench area, they normally need less timing advance to make power. Thus a skillful tuner can tune the engine to be further from the detonation threshold, making the engine more reliable.
Quench zones promote more complete burning and reduce the likeliness of detonation by increasing turbulence of the fuel air mixture as the piston comes to TDC by squishing the fuel air mixture toward the sparkplug and away from the end zones of the combustion chamber. This reduces the amount of fuel-air mixture near the ends of the combustion chamber where it does not completely burn (thus being wasted) by pushing or squishing it toward the centrally located sparkplug where it can easily be ignited. When heads have additional quench area, they normally need less timing advance to make power. Thus a skillful tuner can tune the engine to be further from the detonation threshold, making the engine more reliable.
03-14-2012, 08:08 PM
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Thanks I did a little research my self and it looks if I do not change anything that my quench will be 41-44 being as my block will not be decked prior to head install. Stock GM headgaskets compress to .51 and the piston sticks out the top of the cylinder by what I gather avg of .007-.010 then that is what my quench would be. If I am wrong please someone correct me and point me in the right direction.
03-14-2012, 08:39 PM
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Yeah the only way to know for sure would be to actually measure. I already have the stock GM gaskets 28-12498544 on their way. I may just call the sponsor to double check with them on their reccomendation or I'll call the shop thats putting on the hads and tuning it. They have built more than a few LS motors so they know their stuff.
