RSMike

iTrader: (1)

~200hp per piston

SmurfZilla

iTrader: (33)

My car made 777 with more in it.

My engine builder has a good relationship with Mahle. They got a set of 10.5:1 compression pistons custom made for my 2.4L LR build.

Over 6000 miles and no issues......well with the motor anyway.

We had to swap the headgasket about 2000 miles in and everything still looked good.

BRONCO

YEAH BUT ARE THESE THE 4032 ALLOY? or are you guys talking about the powerpak+ I was under the impression 550 is considered the limit with powerpak 4032? If they can take upto 700 I'm defo in

CurseDSM

iTrader: (3)

These are the exact same ones I used in my talon. 500+ hp and will get more.

http://www.extremepsi.com/store/prod...6&cat=0&page=1

RSMike

iTrader: (1)

I emailed Mahle directly and they assured me that the 4032 pistons are rated to 200hp each (800hp for 4 cylinder).

Feel free to email them if you require more information, they replied to me within 2 days.

94AWDcoupe

iTrader: (125)

I spoke with them on the phone before ever using them. They told me 150hp per piston. After using numerous sets I wouldnt recommend more than that either. 525whp is a safe limit. These pistons are not beefy by any standards.

BRONCO

See this is the problem... alot of different opinions and it seems Mahle are not clear either??? I will be running about 550 for now but want scope should I want to whack a bigger turbo on in the future... Maybe 670max. I really like the thought of Mahle pistons as having spoken to a few people who have built engines using them, they seem to seriously rate the quality!!

CurseDSM

iTrader: (3)

If your that worried about what we tell you then order some Wiesco 1400 hd pistons and be done with it. Those will handle anything you throw at it. But I am sure you will reply with well there a light piston yadda yadda. These pistons will be just fine for what your running. Like I said if there good for F1 they should be just fine for an evo.

BRONCO

Dont think you have a clue what your talking about... Pistons can be made out of different types of alloy and finnished differently. Mahle pistons in a f1 car will not be the same ones in your evo lol! DO YOU KNOW THE DIFFERENCE BETWEEN A 4032 ALLOY PISTON AND A 2618?

My03evo

iTrader: (1)

When I was in the search to get new pistons I liked the Mahle's but after doing reseach on the 2 diff alloys I ended up getting the HD wiseco's. Mainly because I'm in the 40psi range and obviously making alot of power but google or I prefer yahoo "4032 Vs 2618 pistons" and read a couple links and you'll see they both have there's pros and cons but if you're making power get the 2618, they might be louder in the morning and require more piston to wall clearance since they expand more than the 4032 but I rather have the peace of mind the pistons arent going to fail when it's making power.

Use yahoo or whatever and read the links it gives you and make a decision for yourself....

94AWDcoupe

iTrader: (125)

without more info on your custom pistons this info is somewhat useless.

They also make pistons from 2618. and even if they were 4032 they may have been made with higher HP in mind. thicker crowns, ring lands, and pins may have been used here.

BlackonBlack2

iTrader: (56)

i'm actually in the same boat... and I was reading up on them as well...
I might have some mixed info here as well...

but i'm comparing the mahle 2618's custom to the WISECO 1400hd which are also 2618's for my 2.4 build..
I've talked with mahle my self... and they recommend a 2618 piston for any dsm's making more then 500hp...

what i'm getting confused on is wtp ratio... from what i've read this information could be all wrong... but... boosted/nitrous applications like a wider wtp ratio...and n\a applications like a tighter wtp ratio...

the recommended wtp is
mahle .0016-.0024
WISECO hd recommended .0045-.0050

so in my eyes... the wiseco hd would be better for a boosted app vs the tighter wtp ratio on the mahle's which are recommended for n/a cars
but the pros for the mahle is weight... which i'm trying to find out for sure... but i think is a good 80grams lighter...
other then that the architectural structure of the two pistons are equal...

its hard to vote against WISECO b/c they have been proven over and over... but i didn't know if there would be a benefit with going with the mahle lighter pistons..

pls correct me if i'm wrong about anything...its my 1st time building a motor... so i could be wrong.. thanks

BRONCO

Well after speaking with a fair few people I have ordered the Mahle pistons with some R&R very light rods I have been lead to believe that the 4032 piston wont take so kindly to det so the most important thing is not having this situation. I just couldnt ignore all the good things I heard about the pistons and want to try them out. They have a good service life which i'm after and should last just aswell mileage wise... as the o.e.m item.

Cheers,
BRONCO

CurseDSM

iTrader: (3)

Don't get in my **** about what I know and what I don't know. You asked about the pistons I gave you the exact same pistons I use and the reference to F1 is because they use Mahle pistons in F1 racing.

RSMike

iTrader: (1)

The Mahle 1.6 thou to 2.4 thou clearance for the Mahle's is including the skirt coating.

4032 expands 15% less than 2618 alloy.
The Mahle piston clearance is actually 3 thou, but the coating is 1.4 to 0.6 thou.
This was also explained to me by Mahle.

(this is assumed that an 86mm piston is installed into an 86.000mm bore. The piston is actually 3 thou smaller than the 86mm bore).
Sorry for the mix in measuring units

Cheers, Mike