Compression Ratio on an LQ4
Thread Starter
Teching In
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Joined: Jan 2009
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From: I've got that Wheeling Feeling, WV
Compression Ratio on an LQ4 ok, so i recently blew a rod bearing in my 5.3 in my s10.
why not go bigger.
I found an lq4 for cheap, im going to re use the crank and block (machine whats needed and what not) here is my list of plans
Eagle H-Beam 6.125 rods
Mahle 4cc dish pistons
my factory ported 5.3 heads
patriot performance 590/580 cam
but my question is, what do you guys think my compression ratio will be with my setup, ive seen the 5.3 heads on a 6.0 takes it to 10.5:1, but with the 4cc pistons will it be higher?
I plan on running nitrous, as my FJO box and jets were all on and my motor started knocking before i could take it to tune for nitrous.
i will be pulling nitrous through the rail (factory ls1 rail now) but may upgrade later to bigger injectors (camaro factory injectors) and a bigger rail kit.
dont plan on more than a 150-200 shot but will this all work?
sorry for the book of a post lol
why not go bigger.
I found an lq4 for cheap, im going to re use the crank and block (machine whats needed and what not) here is my list of plans
Eagle H-Beam 6.125 rods
Mahle 4cc dish pistons
my factory ported 5.3 heads
patriot performance 590/580 cam
but my question is, what do you guys think my compression ratio will be with my setup, ive seen the 5.3 heads on a 6.0 takes it to 10.5:1, but with the 4cc pistons will it be higher?
I plan on running nitrous, as my FJO box and jets were all on and my motor started knocking before i could take it to tune for nitrous.
i will be pulling nitrous through the rail (factory ls1 rail now) but may upgrade later to bigger injectors (camaro factory injectors) and a bigger rail kit.
dont plan on more than a 150-200 shot but will this all work?
sorry for the book of a post lol
Thread Starter
Teching In
iTrader: (4)
Joined: Jan 2009
Posts: 37
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From: I've got that Wheeling Feeling, WV
i havent figured out what head gasket, probably a cometic .036, and cc's on an lm7 head are 62cc
yes stock deck height.
ive found a calculator so i think im getting the hang of this
yes stock deck height.
ive found a calculator so i think im getting the hang of this
Staging Lane
Joined: May 2011
Posts: 69
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From: Finleyville
I'm thinking either way it's gonna run like a ****. Your probably going to have some serious traction issues. Did you have the heads flow tested after the porting? And we're they machined for a bigger intake valve?
Thread Starter
Teching In
iTrader: (4)
Joined: Jan 2009
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From: I've got that Wheeling Feeling, WV
I had traction issues with the 5.3. Going to have to get scientific with my cal tracs and see what I can do for traction. I guess -4cc pistons would take me over 12:1 which isn't a good thing. I'm going to look for -10 or -12 ish area and get down around 10.8:1.
If I remember I'll post up pictures on my truck in the correct section.
