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most compression with boost? (success stories?)

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Old 08-07-2012, 04:27 PM
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Originally Posted by red98ls1
I'm planning to run 12.5 CR with about 16psi.
on E85.
Old 08-07-2012, 05:02 PM
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I think a lot of people get greedy with timing on E85 and blow stuff up.
Old 08-07-2012, 08:17 PM
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10.6 to 1, 14 deg timing, meth injection, 12 lbs on dyno 741/689. Forged lq9, Afr heads.
Old 08-07-2012, 08:26 PM
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This is good to see. I was concerned that i would be eventually putting boost to my stock compression LH6 (9.9:1) on pump 93 and having issues.
Old 08-07-2012, 08:41 PM
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Given a certain volume in a combustion chamber to create X amount of cylinder pressure, I am going to fill as much of that volume as humanly possible with a combustible (air/fuel) rather than filling it with an aluminum piston (notsomuch combustible)
Old 08-07-2012, 10:00 PM
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Old 08-07-2012, 10:10 PM
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Also known as the size of the bomb

Kurt
Originally Posted by The Beast
Given a certain volume in a combustion chamber to create X amount of cylinder pressure, I am going to fill as much of that volume as humanly possible with a combustible (air/fuel) rather than filling it with an aluminum piston (notsomuch combustible)
Old 08-07-2012, 11:15 PM
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I have been curious about this for a while as well. I plan on going with a stroked LS2/LS3 this winter and will have to run it NA for about 6 months to a year until I have funds for the blower. I planned on running on 93 pump fuel (no meth, etc) and was wondering what the highest CR I could run safely. Sounds like 9.5 to maybe 10:1 at the most? Probably wont see more than 15-16 psi.
Old 08-08-2012, 02:06 AM
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Originally Posted by Rickys S/C Z28
i have been looking at the same question . What i have seen is BAKED's car(stock cube ls1) 11:5:1 on E85 ported 241's with a glide at 15 pounds make 800 plus and run 8's at 3400 pounds.

Mine has 853's on it, get it right lol

On e85, 16.5 psi it went 8.92 @ 159 in my 3430 lb Camaro with a 1.40 60'... on 16*of timing...

On 19psi it made 930rwhp. If I thought the stock block and crank were up to the task I would push it up to 25 psi or so but thats gonna have to wait till my new motor is finished. New motor will be at least 11.5:1
Old 08-08-2012, 02:07 AM
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Almist forgot... I am runnibg a Bullseye 80mm with the "Batmo" wheel
Old 08-08-2012, 02:32 AM
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10.2:1, 16psi boost, 15* timing, pump gas + meth
wouldn't advise it without meth or e85.
Old 08-08-2012, 08:47 AM
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Originally Posted by The Beast
Given a certain volume in a combustion chamber to create X amount of cylinder pressure, I am going to fill as much of that volume as humanly possible with a combustible (air/fuel) rather than filling it with an aluminum piston (notsomuch combustible)
Originally Posted by 427
Also known as the size of the bomb

Kurt

-so long as you have the time to burn it all
-I already got this aluminum all up in my way and I'd rather not remove it tho Kurt has seen how I can force that issue.
Old 08-08-2012, 11:00 AM
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If you can't burn it all because of the time it takes you are doing something way wrong, or running nitro.
How high is the comp in the engine you have?

Kurt
Originally Posted by MIGHTYMOUSE
-so long as you have the time to burn it all
-I already got this aluminum all up in my way and I'd rather not remove it tho Kurt has seen how I can force that issue.
Old 08-08-2012, 02:00 PM
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its got mahle -3cc pistons and the heads are down .030, stock ls7 gaskets (ls7 block and rotating asm)

Last edited by MIGHTYMOUSE; 08-08-2012 at 02:17 PM.
Old 08-08-2012, 09:43 PM
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What power level you trying for? Mahle makes 4032 and 2618 pistons, if you plan on 850 plus it should have the 2618. That ratio will not forgive mistakes is the downside. The upside is this aint your first rodeo!

Kurt
Old 08-09-2012, 06:00 AM
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I really want to up the CR in mine to around 10-1 or so.
Old 08-09-2012, 07:37 AM
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i dunno which one, was just a fleeting thought.. suppose i should leave this one alone
Old 08-09-2012, 08:29 AM
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Am i missing something here? do you have another car already?
Old 08-09-2012, 10:01 AM
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i have something with the wrong pistons in it!
Old 08-09-2012, 04:27 PM
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Originally Posted by BAKED
Mine has 853's on it, get it right lol

On e85, 16.5 psi it went 8.92 @ 159 in my 3430 lb Camaro with a 1.40 60'... on 16*of timing...

On 19psi it made 930rwhp. If I thought the stock block and crank were up to the task I would push it up to 25 psi or so but thats gonna have to wait till my new motor is finished. New motor will be at least 11.5:1
MY BAD ! hahahahahhahah 11.5:1 and boost! are you crazy? that will never work hahhahahaha


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