Well, I just got in a set of new 9.8:1 Cp Pistons for a GSR. They look very well made in my opinion. One thing i noticed right away is that this pistons doesnt have the grooves around the top part of the piston like a JE does. Anyone know what the theory is behind not have the grooves?? See picture # 4 for the closeup of what i am talking about. We'll have to wait a couple weeks to see how these hold up to 650+whp. I'll be trying them out in my motor.

 

the grooves "soften" the blow of detonation. They take a little of the beating before the rings, it usually helps a motor a little bit before blowing. How much do these run?

 

damn, those are the exact pistons im gonna get

 

whatcha know, I got the same ones




CP Pistons by far the nicest ive seen

 

man those are beautiful!!................. nails

 

very nice indeed

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Toda Party &raquo;</TD></TR><TR><TD CLASS="quote">man those are beautiful!!................. nails</TD></TR></TABLE>
I was thinking the same thing! LOL!

 

Mase you do have some beautiful hands. Can you recommend a nail shop

 

Mase you have such lovely hands

 

haha mase. not only do you tan but you paint your nails!! JK, I am sure its Danielles nails..

art

 

that really is gorgeous machine work. It seems they run their machines better than JE or wiseco, the only helpful addition would be detonation ring things

 

They are sweet pistons. When I go to a larger bore I will buy these in 83mm. The cool thing is that they have the gas ports in them. Earl had a nice post on these a while back.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93LSivic &raquo;</TD></TR><TR><TD CLASS="quote">They are sweet pistons. When I go to a larger bore I will buy these in 83mm. The cool thing is that they have the gas ports in them. Earl had a nice post on these a while back.</TD></TR></TABLE>
You dont want to use the lateral gas ports on the street.

art

 

Care to elaborate? I havent researched these at all. Maybe you can start me off Art. Im ***uming these are for drag only tolerances.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Arturbo &raquo;</TD></TR><TR><TD CLASS="quote">haha mase. not only do you tan but you paint your nails!! JK, I am sure its Danielles nails..

art</TD></TR></TABLE>


no actually, they are stans moms nails

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93LSivic &raquo;</TD></TR><TR><TD CLASS="quote">Care to elaborate? I havent researched these at all. Maybe you can start me off Art. Im ***uming these are for drag only tolerances.</TD></TR></TABLE>

i believe the gasports are for airflow to go through and to push the rings more to the wall to seal better. pushing the rings on a daily driven street car would be harsh to the rings causing a short lifespan

 

so cp pistons should not be used on the street then right?for a daily driving basis

 

no. you can get them without the gasports. its just an option

heres the link.

https://honda-tech.com/zerothread?id=507347

 

Turbo R hit the nail on the head. Its good for ring seal but not good for longevity of the rings.

Goldberg, the CP pistons are great for the street. You do not need the lateral gas ports.

BTW, Endyn also has the lateral gas ports. As a matter of fact probably all the piston companies do.

art

 

NIce pistons and damn mase!
always impressive with the ladies!

 

Nice pistons....I might have to use these on my build up

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FFgeoff &raquo;</TD></TR><TR><TD CLASS="quote">the grooves "soften" the blow of detonation. They take a little of the beating before the rings, it usually helps a motor a little bit before blowing. How much do these run?</TD></TR></TABLE>

Hocus pocus....some say that actually promotes detonation. CP told us they have a reason for not running those groves at the top, but I forget. But Geoff, if you count how many ring lands there are on the side of the piston, you will notice there is 1 too many. Between the 1st and second ring there is a little grove there that is CP's anti-detonation groove.

 

i thought that gap was called a gas trap? i could be wrong tho.

 

do you soak in polmolive?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SEFI8LOxCivic &raquo;</TD></TR><TR><TD CLASS="quote">i thought that gap was called a gas trap? i could be wrong tho.</TD></TR></TABLE>You are correct. It is actually called an accumulator groove to catch any potential compression leaking past the upper ring.
As to the anti-detonation rings, CP says that if they worked, they would use them. The rings started out as a marketing tool by another manufacturer to help sell pistons. They caught on with everyone from there but were never effective as to stopping or controlling detonation, only weakening the piston.
CP Pistons are not the cheapest but they are the most accurate piston made. Retail on these pistons/rings is $900. I sell them to H-Ters at $495 per set of rings/pistons for off the shelf sizes. Go to http://www.cppistons.com for their catalog.