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12:8 compression how much timing do it i need

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Old Jun 5, 2010 | 04:48 PM
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Default 12:8 compression how much timing do it i need

just wondering where should the timing be at on that kind of compression should it be high or low
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Old Jun 5, 2010 | 04:53 PM
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Default Re: 12:8 compression how much timing do it i need

put it on the dyno and find out.
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Last edited by q16racer; Mar 13, 2011 at 04:44 PM.
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Old Jun 5, 2010 | 04:55 PM
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Default Re: 12:8 compression how much timing do it i need

im going to i just would like to know how much advanced is the timing to run that much compresison
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Old Jun 5, 2010 | 05:01 PM
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Default Re: 12:8 compression how much timing do it i need

depends on how well the head flows and how well the engine expels the exhaust gases.

are you tuning the engine yourself?
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Last edited by q16racer; Mar 13, 2011 at 04:44 PM.
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Old Jun 5, 2010 | 05:03 PM
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Default Re: 12:8 compression how much timing do it i need

going to place to have it tuned but im trying to figure you why im running so shitty its a h22a type s pistons and milled 60 over head in a h2b setup but it doesnt feel so powerful as it should im trying to figure out why
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Old Jun 5, 2010 | 05:32 PM
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Default Re: 12:8 compression how much timing do it i need

what cams? what computer? what engine management?

why did you shave the head down so much?
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Last edited by q16racer; Mar 13, 2011 at 04:44 PM.
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Old Jun 5, 2010 | 10:12 PM
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Default Re: 12:8 compression how much timing do it i need

Originally Posted by buffgsr
milled 60 over head
Milling it that much is going to retard the hell out of your cam timing. You might need to degree the cams back to spec.
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Old Jun 6, 2010 | 04:21 PM
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Default Re: 12:8 compression how much timing do it i need

Yeah, you milled that head quite a bit there.
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Old Jun 6, 2010 | 05:03 PM
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Default Re: 12:8 compression how much timing do it i need

Originally Posted by 92civlude
Milling it that much is going to retard the hell out of your cam timing. You might need to degree the cams back to spec.
Yeah, and ignition timing at the same time. Overall with more compression you will be running less timing. .06" doesnt leave much piston to head clearance either unless you re-counterbored the head for the pistons. I'm pretty sure taking .06" off will get rid of the quench pads in the head completely.
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Old Jun 6, 2010 | 07:18 PM
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Default Re: 12:8 compression how much timing do it i need

i know i have high 12:1 CR pistons and my ignition timing is pretty advanced to get it to run any decent without a tune. i blow quit a bit of black smoke and im running really rich. at least your getting a tune
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