JDM 3V 302E Stroker ShortblockMotor cp piston problem

[Metallicats]

Need help !!!!!!!!!!last year, I bought the 302E stroker shortblock motor equipped with CP piston.Last week,I broke one piston.My tuner talk to JDM to order a new piston and it is no longer available.We need to purchased a new set of piston but i don't want this,i just need one.First view,JDM don't want to help us.I need your help to found the # of the part or exactly the spec to buy directly from CP.I don't want to blame the engine because I'm very happy with my setup.

 

[BruceH]

Need help !!!!!!!!!!last year, I bought the 302E stroker shortblock motor equipped with CP piston.Last week,I broke one piston.My tuner talk to JDM to order a new piston and it is no longer available.We need to purchased a new set of piston but i don't want this,i just need one.First view,JDM don't want to help us.I need your help to found the # of the part or exactly the spec to buy directly from CP.I don't want to blame the engine because I'm very happy with my setup.

That was a special Saleen designed piston. A one off for CP. They made a batch for Saleen out of 4032 aluminum at the odd compression height required for a 3.8" stroke. The remaining supplies have been exhausted. MindIfISmoke? on this forum has 7 of the high compression stroker pistons. Like you, he had one go out. You might want to contact him.

JDM and Brenspeed both stock pistons with the correct compression height for your crank and rods. Other than those three options you are looking at custom made pistons.

 

[Speed+Clinic]

Brenspeed runs them, CP still makes them but they are made from crappy 4032 aluminium.

Either way I would go with a set of Manley pistons, they do make them for the 3.8 Stroke with the 3.850 Rod. And they are made out of 2618 aluminium which can handle a shitload more of a beating. Oh and they are cheaper

 

[TheKurgan]

K gonna throw some flame on the fire.

I wouldn't say 4032 is crappy. It doesn't have the tensile strength of 2618 but it's probably better for a street car due to less wear. And are you sure they actually are 4032 ? The one he needs is from a 302, not the same piston for a 281 even though they are both CP. Most pistons CP makes seem to be 2618.

OP: How did you break it ?

 

[Speed+Clinic]

K gonna throw some flame on the fire.

I wouldn't say 4032 is crappy. It doesn't have the tensile strength of 2618 but it's probably better for a street car due to less wear. And are you sure they actually are 4032 ? The one he needs is from a 302, not the same piston for a 281 even though they are both CP. Most pistons CP makes seem to be 2618.

OP: How did you break it ?

4032 is crappy but better than stock. It does have a higher silicon content so it helps during the cold starts and such since the piston expands less with the heat. (silicon doesn't expand with heat). I am 100% sure they are 4032, this is the only piston that CP makes that isn't out of 2618. If it is for a 3.8 stroke crank that automatically eliminates 281.

Go with Manley Pistons. Cheaper and made out of 2618.

Directly from mike lozano @ cp-carrillo.com

Hello,
We do not have pistons in stock for the Saleen engines but one of our vendors does. Please contact: Brenspeed @ (574)594-9559. They do carry a +.010” oversize Saleen 3valve piston kit to work with the 3.800” stroke and 5.850” rod.

The pistons we made for Saleen are made from 4032 alloy. The majority of everything else we produce is made from 2618 alloy.

Mike Lozano
CP Pistons
Sales & Tech Support


1902 McGaw
Irvine, CA 92614

Office PH: 949-567-9000
Fax: 949-567-9029


www.cp-carrillo.com

 

[702GT]

I think Summit sells the CP's individually as well.

 

[SherrodMustang]

I have made a whole lot of horsepower so far using those crappy CP pistons... interesting...

 

[BruceH]

I have made a whole lot of horsepower so far using those crappy CP pistons... interesting...

I used the stock stroke version made for saleen in my last motor. Horsepower1 on ebay was blowing them out a few years ago with rings and manley rods for $737. Only took it up to 599rwhp though. CP makes some nice pistons.

 

[BMR Tech]

The fastest 2V Modular Powered Mustang in the world runs 4032 Pistons with 44 #'s of boost through an 88mm Turbo.

OP, your best bet may be to go with a new set of pistons.

You could try to contact Livernois and see if they have an option for you in the Mahle brand.

 

[JimIII@JDM]

He wants 2 individual pistons, which we do not have on the shelf. CP wants us to buy sets. We have a piston now with Manley that we use in all of our 302 motors to date and I can offer a full set of them. They are stronger, and cheaper, and are designed to our spec, not saleen's. We have improved the ring land design and use the 2618 material. You dont want to throw two random pistons in you want them balanced the same. Better to go with a new complete set, which I was happy to offer but he did not respond back to me after we exchanged emails.

I will continue to help you if you like, I just can't get two seperate pistons. For that I appologize. Call me if I can help...732-780-0770

Thanks,

JimIII

 

[19COBRA93]

I've been through this same thing with the Saleen CP's. My stroker is currently down, but when I build it back up I'm going to be running the JDM Manley's. I personally don't like the ring land design on the Saleen CP's and am not surprised they failed. The Manley's have a much better design, and the price is very nice too.

 

[TheKurgan]

Ring land design should be different for a 4032 piston right ? Those pistons are installed with tighter clearances...

 

[SherrodMustang]

The fastest 2V Modular Powered Mustang in the world runs 4032 Pistons with 44 #'s of boost through an 88mm Turbo......

There you go!

31lbs of boost on my... with zero problems to speak of!

 

[Speed+Clinic]

So on this thread they are 4 diferent people that experimented cp piston failures?

 

[Speed+Clinic]

There you go!

31lbs of boost on my... with zero problems to speak of!

You always run e-85? the problem with having a higher silicon % is that they make the pistons a little bit more brittle to detonation. If you always use "race gas or e085" your detonation margin is small. On the other hand you are much more likely to get detonation with 93 oct. One small detonation on the cp and there goes your ring land.

 

[TheKurgan]

So on this thread they are 4 diferent people that experimented cp piston failures?

With 0 explanations...

 

[TheKurgan]

You always run e-85? the problem with having a higher silicon % is that they make the pistons a little bit more brittle to detonation.

And with a lower sillicon %, you will need to set the engine up with loose clearances because of the expansion which results in more wear and noise.

 

[SherrodMustang]

detonation will kill the best pistons money can buy.... just saying.

But true, I do run E85 all the time and nothing else... pretty much impossible to get E85 to detonate, why I love this stuff... super cooling, cheaper than pump gas, high octane and smells freaking awesome... lol

The bad... harder to find, more frequent oil changes and takes a larger fuel system to run.


Makes a shit ton of horsepower for $3 gallon....

 

[JimIII@JDM]

detonation will kill the best pistons money can buy.... just saying.
QUOTE]

No matter how good the material of the piston, if you get detonation...your going to break it! I cant agree more with Sherrod here.

We have had 3v mustangs with stock pistons close to 600 RWHP and run 10.0's in the 1/4 mile with about 200 passes in 2 full race season on one particular car. We ran straight VP MS 109 race fuel to protect the motor.

 

[19COBRA93]

My CP's failed because I was running too much boost/timing on pump gas. It's not the pistons fault. It's my fault. I would have destroyed a set of $2500 custom pistons just as easily.