What Compression Pistons??
09-21-2004, 09:19 PM
#1
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What Compression Pistons??
I need to purchase a set of Forged pistons for my FI setup. Lookin into CP pistons, but not sure what Compression to go with.
First off, I have a GS-R (B18C1). I'm also putting in a Cometic 0.120" Head Gasket which will lower my Compression Ratio to 8.2:1 cuz it's so thick.
Now should I go with 9.0:1 Pistons or 9.8:1 Pistons?
Another quick question...
So if I get 9.8:1 Pistons and put the Cometic 0.120" head gasket in, how low will my Compressions Ratio be around? What about with 9.0:1 Pistons?
First off, I have a GS-R (B18C1). I'm also putting in a Cometic 0.120" Head Gasket which will lower my Compression Ratio to 8.2:1 cuz it's so thick.
Now should I go with 9.0:1 Pistons or 9.8:1 Pistons?
Another quick question...
So if I get 9.8:1 Pistons and put the Cometic 0.120" head gasket in, how low will my Compressions Ratio be around? What about with 9.0:1 Pistons?
09-21-2004, 11:59 PM
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Re: What Compression Pistons?? (Deckedlude)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Deckedlude »</TD></TR><TR><TD CLASS="quote">**** the headgasket and just get 9:1 pistons</TD></TR></TABLE> agreed
09-22-2004, 07:48 AM
#6
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Re: What Compression Pistons?? (project dc2)
hmmm... why not both? The Head Gasket AND some Forged Pistons? I would use an OEM HG, but I already spent $120.00 bucks on this Cometic HG. They told me it would be great for Boosted applications.
09-22-2004, 07:55 AM
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Re: What Compression Pistons?? (B00ST2nR)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B00ST2nR »</TD></TR><TR><TD CLASS="quote">hmmm... why not both? The Head Gasket AND some Forged Pistons? I would use an OEM HG, but I already spent $120.00 bucks on this Cometic HG. They told me it would be great for Boosted applications.</TD></TR></TABLE>
Why both? A thicker headgasket destroys your quench, messes with your cam timing, and is more prone to blow out because it's thicker. Running 9:1 Cp pistons and a .12" cometic will result in 7.6:1 compression. Running 9.8:1 pistons and a .12" cometic will result in 8.2:1 compression. That 8.2:1 with the massive head gasket will probably handle as much boost and power on pump gas as a 9:1 motor with a stock thickness headgasket. Return or sell the headgasket, run some 9:1 pistons, and be done with it. A thick headgasket just adds too many headaches, especially if you're going to run low comp pistons anyways.
Why both? A thicker headgasket destroys your quench, messes with your cam timing, and is more prone to blow out because it's thicker. Running 9:1 Cp pistons and a .12" cometic will result in 7.6:1 compression. Running 9.8:1 pistons and a .12" cometic will result in 8.2:1 compression. That 8.2:1 with the massive head gasket will probably handle as much boost and power on pump gas as a 9:1 motor with a stock thickness headgasket. Return or sell the headgasket, run some 9:1 pistons, and be done with it. A thick headgasket just adds too many headaches, especially if you're going to run low comp pistons anyways.
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09-22-2004, 02:05 PM
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Re: What Compression Pistons?? (fast94ex)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fast94ex »</TD></TR><TR><TD CLASS="quote">You could just mill the head to get the compression where you want it.</TD></TR></TABLE>
that just makes **** complicatd. keep it simple.
that just makes **** complicatd. keep it simple.
09-22-2004, 02:50 PM
#11
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Re: What Compression Pistons?? (project dc2)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by project dc2 »</TD></TR><TR><TD CLASS="quote">
that just makes **** complicatd. keep it simple. </TD></TR></TABLE>
Yep.
I just got myself some 9:1 CP Pistons with Eagle Rods. I'll be using a stock Head Gasket.
that just makes **** complicatd. keep it simple. </TD></TR></TABLE>
Yep.
I just got myself some 9:1 CP Pistons with Eagle Rods. I'll be using a stock Head Gasket.
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