what it??
03-31-2008, 08:56 PM
#1
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Join Date: Dec 2006
Location: scranton, nd
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what it??
what if i put in forged pistons and aluminum heads and bumped the copression to 11.5 or so and ran a pretty big cam? would this make some good hp? it would be cheap.
i am really just talking out my a$$ so set me strait.
my goal is low 11s
i am really just talking out my a$$ so set me strait.
my goal is low 11s
j/k
03-31-2008, 10:13 PM
#7
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Posts: 4,800
Porting is the key to performance and good porting is not cheap but gets good results for the money. 11.5 is not that high a compression ratio for an LT1, with good quench and the right cam over 12:1 is done fairly often.
My car made 290rwhp with a ZZ4 cam and untouched iron heads, the swap to ported aluminum heads a thin gasket and a cam only in the mid 220s duration pushed that number up substantially. Do not have dyno numbers but the performance says at least 390rwhp meaning a gain of 100rwhp or more over an already cammed setup. Compression is 11.2-3, heads milled to 53cc and used a .026 gasket with pistons .026 down, virgin shortblock, never even pulled a bearing cap.
My car made 290rwhp with a ZZ4 cam and untouched iron heads, the swap to ported aluminum heads a thin gasket and a cam only in the mid 220s duration pushed that number up substantially. Do not have dyno numbers but the performance says at least 390rwhp meaning a gain of 100rwhp or more over an already cammed setup. Compression is 11.2-3, heads milled to 53cc and used a .026 gasket with pistons .026 down, virgin shortblock, never even pulled a bearing cap.
04-01-2008, 11:02 AM
#8
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i want to run pump gas, we dont have 93 octane so i dont want to go to hight on the compression. what about edelbrock heads from summit, and a good cam, but i think if i do that i will not be able to spray any more? right?
04-01-2008, 11:11 AM
#9
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Static compression ratio is not what determines octane requirement. Its the dynamic compression ratio, which reflect, among other things, the overlap in the cam.
The Edelbrock LT1 heads are no different than the stock heads. The Edelbrock LT4's are better, but you can get the same level of performance from ported stock heads/matching cam. Try one of out Supporting Vendors.
04-01-2008, 11:33 AM
#11
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If you are at 3,000-ft (~26.1 "Hg), you are losing 10% of the compression compared to sea level (~29.9"Hg), due to the fact that the air in the cylinders is less dense. Running 11.5:1 should not be a problem.