Custom 4032 pistons

[Inline__engine]

Hi

Can anyone point me in the right direction of a good contact to get some modern quality custom 4032 pistons made for a normally aspirated street engine? im wanting some nice modern features such as gusseted skirt and skirt coatings etc

i have all engine specs, a sample piston and CAD model of a dome that gives me the correct CR but need a contact who i can work with to get it into production. Im not afraid of paying money for quality.

i can get some 2618 pistons but i want something more suited to my application with quieter performance, better wear characteristics and i dont need the added heat capability that a forced induction engine would.

TIA

[Inline__engine]

Do you have a contact there you've used before?

[Inline__engine]

Thanks for everyone's suggestions. I guess as noted that I’m needing to go through a dealer but one that is willing to work with me a bit not just take my money and just spit out any random design with the right crown +/- cc to give the desired CR as IMO there is more to it than that.

It’s not an obscure build and plenty of 2618 slugs are available but am not aware of any in the higher silicon alloy and even less engineered with consideration of combustion requirements.

I’ve got some suggestions for dealers to contact now so I will make some inquiries and see.

On a similar note has anyone taken a silicone or epoxy mould of their cylinder head and sent that off ? What approach would the piston designer do differently with the chamber mould?
i could see them being able to minimize some crevices especially on a high comp engine where dome might need to closely follow the complex chamber but on a mild 11:1 build any real advantages? Would they shape it so the mixture is forced closer to the hot side of the head ?

[Inline__engine]

hoffman900 said:

All but Mahle go direct.

are you saying you can go direct to all companies except Mahle?

[Inline__engine]

hoffman900 said:

The big ones that work with multi million dollar professional racing programs, like CP, Mahle, and Gibtec - where the engines are fully instrumented and have several dynos going full time of R&D, have a lot of engineering chops to draw from. CP and Mahle also do some high end OEM work.

i agree that they can do it, but for the average guy off the street buying a single set i cant see them doing much other than adhering to some basic principles....

[Inline__engine]

Is it worth giving up being able to use a fancy Box shape, X-forging or FSR style piston over a full round skirt shape ? One manufacturer i've been discussing with only does 2618 in the X-forging style.

It’s a street engine so longevity, quietness, etc matter so 4032 is the best bet, but it is a high performance engine all the same and as best I can tell the piston might weight a little more due to not being able to use metal as efficiently and using a slightly longer pin and there might be some added skirt friction. Is this a good tradeoff?

So the question is a full round skirt going to give up performance or should I look for find a different manufacturer….? how much difference would these aspects typically make ?

Edited by Inline__engine on Monday 17th October 22:14

[Inline__engine]

hoffman900 said:

CP-Carrillo and Mahle are the two premier piston manufacturers. Not sure about getting Mahle to design you something, but CP can design what you want.

CP is Calvert (Calvert brothers) and P is for Pankl. They have also since bought Carrillo rods a couple years ago.

CP was formed when Wayne Brooks and the Calverts sold JE (they were the owners). The Calverts linked up with Pankl and Wayne retired. He has since opened up Racetec pistons. They're not really in the market your looking for however (beautiful Pistons though).

CP:
http://www.cp-carrillo.com
Racetec:
http://racetecpistons.com
Diamond:
http://www.diamondracing.net

Diamond would be another source.

JE is good, but not what it was.

The Wossner stuff while I'm sure is high quality always looked unfinished to me.

For a girder / box style piston, for sure go with CP.

I've also attached a piston I've had Racetec do for me for an air cooled application

Edited by hoffman900 on Monday 30th May 15:01

I sent them a ton of pertinent information, picked out my ring pack from Total Seal, send them a chmsber mold, and sent them a Wiseco piston and basically said "make me something better".

Edited by hoffman900 on Monday 30th May 15:31

CP and JE cant do box/X style in 4032 only 2618

[Inline__engine]

things got put on hold for a bit....last piece to the puzzle

[Inline__engine]

i'm more looking at it from point of view is a full round skirt inferior in any measurable way over a braced design in a street engine bearing in mind its not an F1 or nascar engine.....would one ever notice the difference?

i don't feel using 2618 is a compromise i want to make for this engine, its not the right choice

Edited by Inline__engine on Tuesday 18th October 23:01

[Inline__engine]

Mahle MS slugs alloy M124 alloy (4032)

Edited by Inline__engine on Sunday 9th September 00:50

[Inline__engine]

jason61c said:

Mahle are about 40% more than most. Are they worth the extra?

they are not much more expensive when you compare like for like, e.g. compared to JE where you pay extra for FSR skirt, coatings, accumulator groove, etc and the Mahle machining quality appears better