earl

CP Pistons are called the most accurate piston made. All ring lands are measured by lasers to insure they are dead flat. There is no extra flat ring land charge. In fact most manufacturers can't even offer this option. Ring seal is made up of two components. One is accomplished between the ring and the cylinder wall. This is what most people think of. But there is another area that is of equal importance. It is between the ring land and the ring. If this is not perfect, compression will leak at that point. It MUST be perfectly flat. Also check how little of the piston actually touches the wall.


Now check the lateral gas port OPTION (see arrow). This allows pressure going down the side of the pistons to slide behind the upper ring to actually push the ring harder against the wall for better ring seal. Compression ratios are dead nuts on plus there are many other reinforcements built into the forgings that give it extra strength.




This is a piston that you do not have to give to your machinist to do a bore job. If you buy an 83mm piston, your machinist bores the block to EXACTLY 83mm and the clearance is built into the piston at the time it is made.

1.8T_EG

... great info earl!!!... cant wait to get mine!!!

TurboDANDEE

With the gas ports, would that shorten the lives of the rings since its getting more grip than others?

LJR-LUDE01

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1.8T_EG &raquo;</TD></TR><TR><TD CLASS="quote">... great info earl!!!... cant wait to get mine!!!</TD></TR></TABLE>

same here

kamira

looking good earl. I cant wait to get my pistons , remeber gsr bore.

earl

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboDANDEE &raquo;</TD></TR><TR><TD CLASS="quote">With the gas ports, would that shorten the lives of the rings since its getting more grip than others?</TD></TR></TABLE>The lateral gas ports are an option on our race motors, not a standard item. I don't think you would want them on the street because they would probably wear out quickly. For our race motor, they will seal for a longer period of time and give a stronger seal.

SiRkid

beautiful

TurboDANDEE

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by earl &raquo;</TD></TR><TR><TD CLASS="quote">The lateral gas ports are an option on our race motors, not a standard item. I don't think you would want them on the street because they would probably wear out quickly. For our race motor, they will seal for a longer period of time and give a stronger seal.</TD></TR></TABLE>

good info

DR. ON POINT

nice... do they make pistons for DSM's?

DouLik

Good stuff earl, i was tryin to talk my friend into gettin these pistons for his ca18det. I was quoted about 700 for a set of pistons. Nice looking set of pistons you got there!

earl

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DR. ON POINT &raquo;</TD></TR><TR><TD CLASS="quote">nice... do they make pistons for DSM's?</TD></TR></TABLE>
4G63T first and second gen
6G72T
as to off the shelf pistons

BoostedH23a1

sexy

DownOnPower

if you buy an 83mm piston and have the bore 83mm it should be fine? what about the expansion of the piston.

bambooluv

nice.

earl

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DownOnPower &raquo;</TD></TR><TR><TD CLASS="quote">if you buy an 83mm piston and have the bore 83mm it should be fine? what about the expansion of the piston.</TD></TR></TABLE>The clearance is manufactured into the piston. It comes .003-4" undersized. Not exactly sure on the exact amount.

EKFerioHawaii

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beatdownvictim &raquo;</TD></TR><TR><TD CLASS="quote">Good stuff earl, i was tryin to talk my friend into gettin these pistons for his ca18det. I was quoted about 700 for a set of pistons. Nice looking set of pistons you got there!</TD></TR></TABLE>

Wow. Post some specs of the CA when/if he/she is done with the motor.

Speedworks801

Thanks Earl! Good insight.

The Mole

Howa about pistons for the Nissan motors?

Suprdave

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by earl &raquo;</TD></TR><TR><TD CLASS="quote">The clearance is manufactured into the piston. It comes .003-4" undersized. Not exactly sure on the exact amount. </TD></TR></TABLE>

It's .0030. Wow, I can't believe it's built into the piston already...that's awesome.

What about finish honing tho? Take 81.5mm for example. Wouldn't you have it bored to 3.206" Then finish honed to 3.209? I think my #s are right, Im not at home. I'm taking an LS Customer Block to the machinist on monday to be machined...with some 12.5:1 CPs. Good thing I saw this thread...

Suprdave

earl

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The Mole &raquo;</TD></TR><TR><TD CLASS="quote">Howa about pistons for the Nissan motors?</TD></TR></TABLE>
http://www.cppistons.com
6 models available for Nissan