how long do gas ported pistons last ? reliable for all motor daily driver ??

do they make them for 12.5 cr ??

curious to get more info on this..

oh and who offers them ?

 

About 10,000 miles then you may need new rings.

 

hows the car coming along GreenR?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HotWheelz &raquo;</TD></TR><TR><TD CLASS="quote"> reliable for all motor daily driver ??
</TD></TR></TABLE>
Depends on what you call reliable, but in most cases no.

 

If you use lateral gas ports, they will not fill with carbon and you can actually INCREASE ring life as well as seal.
This option is available on all CP Pistons.

 

well i have a fully built head, and mild bottom..

i need to get more performance from the bottom end in my N/A form.

93 closed deck block,
11.0:1 CR type-s pistons .25 oversized
crower pro billet rods
prodrive gears,
fully balanced rotating assembly
balance shaft removal kit
Unorthodox pulley.
clutchmasters flywheel 8 pound.

might change things around.

i need to sleeve so that's a must, then i need to know about pistons.

looking for 12.5 area. only issue is i have a hondata s200 unit. could it be tuned to run on 91 because that's the highest we have around here...

what are the going prices for these gas ported pistons, and do they really give out more power than their normal 12.5 counterparts ?

 

Gas porting adds about $60 to the cost of your pistons. Better ring seal gives you better power.

 

with gas porting it also increases wear in the cylinder wall.

when i order my custom pistons im goin NON gas ported. if my JEs can last 2yrs of hard abuse and still make impressive #s and compression #s as well ill stick to non ported pistons.

 

EARL YOU COULD NOT BE MORE WRONG ON THIS ISUE ANY TYPE OF EXTRA PRESSURE ON THE RINGS WILL INCRESE RING WARE GAS PORTS ARE GOOD FOR RACING NOT STREET USE. CP JE ARE ALL GOOD PARTS BUT ITS THE ENGINEER BEHIND BETTER PARTS ARIAS PISTONS!

 

Turn caps lock off...

I think you are both kinda right...Here's why:

One trane of thought would be that lateral gas ports will last longer than gas ports in the top of the piston. The thing is though, if you ever look at the top of a piston that is well tuned and having efficient combustion without oil burning\too rich, the burn will be in the middle of the cylinder, away from the gas ports. Eventually the piston will accumulate carbon, but the motor will have been re-ringed by then. If\when the top gas ports accumulate carbon, you will loose a significant ammount of ring seal because the rings were 'broken in' with a certain pressure provided by the gas ports.

Any extra pressure on the rings will increase wear, lets use the analogy of sand paper.

Rub your finger against the paper lightly...then rub it against the same paper with more pressure. It will wear off the skin on your finger.

Bottom line is, these aren't for a street-motor that you daily drive and put a shitload of miles on, unless you like rebuilding your motor when it starts to loose compression. I'm done...

Suprdave

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TOM J &raquo;</TD></TR><TR><TD CLASS="quote">EARL YOU COULD NOT BE MORE WRONG ON THIS ISUE ANY TYPE OF EXTRA PRESSURE ON THE RINGS WILL INCRESE RING WARE GAS PORTS ARE GOOD FOR RACING NOT STREET USE. CP JE ARE ALL GOOD PARTS BUT ITS THE ENGINEER BEHIND BETTER PARTS ARIAS PISTONS! </TD></TR></TABLE>Here are my thoughts...If everyone was building their motors to last 100,000 miles and get great gas mileage, lateral gas ports may not be proper. But most turbo motors are luckey to live 20,000 miles before something goes wrong and they over boost or lean out and break something. They are rebuilt again. Sure the rings wear quicker, the cylinder wall wears quicker but it is not like the rings only seal good for 20 minutes. I feel you are looking at maybe 10% less life BUT the life that you do have will be one with better ring seal at the end. I could be wrong...

 

very well put Dave. Alot of people dont understand some parts are just not made to be used on a every day vehcle.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdkindle &raquo;</TD></TR><TR><TD CLASS="quote">hows the car coming along GreenR?</TD></TR></TABLE>

Need cams and a few odds and ends hope to be ready for WWIII at MIR in NOV.

 

I have 12.3:1 Gas Ported Pistons... I heard so many different numbers from so many different people, that I just told myself I'd keep the pistons, throw them in the car, see how long the run for, and when they're are kaput, i'd just get 85.5mm pistons with 14.5:1 compression, retire the motor to track duty only, and throw a b18 in my hatch to drive everyday.

 

I understand the top gas ported piston but the lateral gas ports is kind of vague. Any one has a pic of that ??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rev limiter &raquo;</TD></TR><TR><TD CLASS="quote">I understand the top gas ported piston but the lateral gas ports is kind of vague. Any one has a pic of that ??</TD></TR></TABLE>

same as normal, but the holes are sideways right above the ring.. looks sort of like notches in the side of the piston on top of the ring.

i wouldnt expect to get more than 5000 miles from some gas ported pistons... especially if you drive like me.

 

If you use lateral or vertical gas ports properly with back cut rings, the ring life actually increases because the gas pressure is only forcing on the power stroke and is NOT doing anything on the other three strokes. This compared to a higher tension ring that always has high drag on all four strokes. I have used gas ports on the street without any problems. Easy power and definately worth the money.

 

So it all comes down who puts them in your engine. I mean that persons has to know what he is doing and needs some experience with gas ported pistons.

Back cut rings ?? What exactly is back cut than ?? And do the rings come with the pistons or do you have to order them seperatly ?? Are have them back cut by a shop ??

 

pix of lateral gas ports

 

lateral gas ports with a gt42R turbo doing 3.5bar would definitely run well.

 

I am going to start my race motor build soon and I have been going back and forth on the issue of using gas ported pistons, so I have a few questions about them:

BTW, this is going to be on a K24 or k20 block running about 20-25psi of boost.

How often would a rebuild be necessary to keep a race motor running at it's best (or close to it's best) with gas ported pistons?

Do they just pertain for drag racing, or will they be able used in a motor that will see some road courses?

Who here uses gas ported pistons? Was there a proven benefit by using gas ported instead of regular pistons?


Sorry about so many questions guys, but I haven't been able to find much information about gas ported pistons other than opinions and heresay.

 

I guess it all comes down to if anyone actually has a motor with gas ported pistons that has lasted in the area of 50k miles and still has good leakdown.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rochesterricer &raquo;</TD></TR><TR><TD CLASS="quote">I guess it all comes down to if anyone actually has a motor with gas ported pistons that has lasted in the area of 50k miles and still has good leakdown.</TD></TR></TABLE>

I don't really care about it lasting 50k miles, nor do I expect any race motor to last that long. This engine will not see ANY street duty.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lsvtecpower &raquo;</TD></TR><TR><TD CLASS="quote">lateral gas ports with a gt42R turbo doing 3.5bar would definitely run well. </TD></TR></TABLE>

51psi huh...You should stock up on Headgaskets, hah. That turbo would make around 750whp on gas @ 32-33psi...On Methanol and 50psi...should see 900whp.

If it held together...good luck.