using 8:5:1 pistons?
11-08-2006, 08:13 AM
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Re: using 8:5:1 pistons? (snaileg)
im running 8:1 je pistons. plean on running high boost.
medium compression pistons are good for moderate boost levels, low compression is good for High compression pistons.
i like lower compression to run high levels of boost.
that and my block is fulley built, sleeved,je pistons,crower h beam rods.
at that compression level i can probably run 30 psi safely, (with a great tune) and all the needed upgrades and whatnot
medium compression pistons are good for moderate boost levels, low compression is good for High compression pistons.
i like lower compression to run high levels of boost.
that and my block is fulley built, sleeved,je pistons,crower h beam rods.
at that compression level i can probably run 30 psi safely, (with a great tune) and all the needed upgrades and whatnot
11-08-2006, 11:18 AM
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Re: using 8:5:1 pistons? (b18sihatch)
The lower compression you go the more boost you have to run to reach you goal. The more compression you run the less boost you have to run to reach your goal.
It's a give and take IMO. I'm running 10:1 for my boost setup.
It's a give and take IMO. I'm running 10:1 for my boost setup.
11-08-2006, 11:27 AM
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Re: using 8:5:1 pistons? (QuarterMileMaster)
Everything can be compensated with boost basically, lower compression is just going to call for a psi or two at the most to make up for the lesser bit of compression. Lower compression is also nice because it allows you sometimes to get away with difference in octane levels.
Honestly i dont think most people even know there actual compression anayways. After decking blocks and adding in aftermarket head gaskets mated with random CC'd pistons.../rant
Honestly i dont think most people even know there actual compression anayways. After decking blocks and adding in aftermarket head gaskets mated with random CC'd pistons.../rant
11-08-2006, 12:00 PM
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Re: using 8:5:1 pistons? (urbansi)
I have srp 8.5:1 pistons. But theyre in an LS block with a GSR head that has been decked twice, and to make it more confusing I have a cometic 3-layer HG. I have no idea what my exact compression ratio is, I saw a CR calculator on the net somewhere, it was pretty cool but I still dont really know exactly what mine is...
11-08-2006, 04:11 PM
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Re: using 8:5:1 pistons? (TurboCoop)
i dont think the compression ratio calculator would take into consideration your stuff has been decked lol.
or the fact that you have a aftermarket headgasket. i would like to say decking might raise the compression ratio and the gasket would lower it. i would say you arent anywhere above 8:7:1 maybe a little more.
the lower the compression is also good because it will allow high levels and keep the stress on the sleeves lower.
than say running 15psi with 10:1 compression you are adding even more stress to a high level compression block.
a higher compression pistoned block with sleeved and high psi levels would be good but i would recomend sleeves for that kinda application
or the fact that you have a aftermarket headgasket. i would like to say decking might raise the compression ratio and the gasket would lower it. i would say you arent anywhere above 8:7:1 maybe a little more.
the lower the compression is also good because it will allow high levels and keep the stress on the sleeves lower.
than say running 15psi with 10:1 compression you are adding even more stress to a high level compression block.
a higher compression pistoned block with sleeved and high psi levels would be good but i would recomend sleeves for that kinda application
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