I'm looking to run a low expansion alloy piston in my 2.3 engine.
Only looking to run about 500whp.

Can anyone recommend low expansion pistons that they have used and/or researched here.

Here's my list so far

HKS (expensive, nickel coated crowns)
Supertech
Mahle

Any more to add to the list?

I will be running an 86mm piston, and 7600rpm rev limit.
Manley H beam rod.
ACL bearings.
100% daily driver

Cheers, Mike

 

for 500 whp non on the list.... those are 4032 alu and I think 2618 is the way to go at that power.

 

My tuner has been running HKS low expansion SR22 pistons for 4 years in his drift car.
He's running 550whp, and the car is treated very very roughly.
After pulling down the engine 3 times over those 4 years, the pistons are perfect. The nickel coating is still good too.

If they can make 550+whp on a stock engine, why can't i do it with aftermarket forged pistons?

 

JE . Just make sure you get the correct piston to wall clearance.

 

JE does not offer a low expansion alloy piston as far as i know

 

pretty sure most piston manufacturers will make you pistons in 4032. JE does for sure.

 

You have over 1000 posts yet still haven't found the search feature . . . Here let me provide this link I found from google for you. http://www.jepistons.com/Catalogs/SR...ishi/4g63.aspx
4032 type piston is what you are asking about btw. 2618 is high expanding

 

Also piston skirt / cyl wall wear isn't what is going to cause the piston failure you are going to run in to when trying to run that kinda power so Idk what your point is by stating that. The reason you want 2618 is because it can expand under high heat psi power levels as well as the softer metal is more forgiving to knock and detonation spikes things that will cause it to crack not wear the wall.

 

Hey Mike

I believe the Supertech and Wiseco make good alternative 4032 Alloy pistons to HKS...

There are DSM's and EVO's that have been running Wiseco's for years and are still making power and some of them are in excess of 600HP+

For a race motor 2618 is the stonger Alloy and lots off old school racers subscribe to the happy slappy engine theory to minimise failures due to heat expansion...

My philosophy is 4032 for street cars and 2618 for out and out race cars;

Built my street car 4G63 stroker with Wiseco 4032 started out with a GT30R and upgraded to a 6262 so I have had a brand new set of 86mm CP's sitting under my Coffie Table as backups, going on 3years now and the Wiseco's are still running strong...

 

Mahle hands down. Been sold on them for years. I have run just about everything out there. Hold a mahle in your hand next to any other other piston. mahle is a step above. The machining is incredible.

wiseco and JE both offer 4032 alloy on request. JE would be my second choice.

 

I disagree a bit... daily drives usually get filled with pump fuel at times... and as the question came from NZ, down under, and according to me they dont have high octane fuels/E85 at the pumps.
To build a 2.3l 500whp car you have to boost it... at least 24psi+ and no 95 ron fuel will cope with that boost on most cars.... maybe some direct injection cars....

what is the down side of 2618 alloy pistons expect the cool running slap noise?

 

shorter life.

 

all the 4032 ones I saw failed way before the 2618.... but thats just here in sunny SA.

 

assuming nothing terrible happens, a 4032 piston should last longer and a cast piston should last even longer than that.

 

+1

Seen Mahle's hold up at 1000whp on pump gas with no signs of damage or fatigue.