thinking of buying this low comp botom end but trying to find out what pistons they are ??

they look abit like skimmed mahles to me

 

What makes you think they are skimmed Mahle's? Usually, when you skim Mahle's you lose the valve pockets and there is no need to have them added again, obviously.

So, can't be absolutely sure what they are.

 

Looks alot like skimmed Mahle's mate. The pockets doesn't need to be removed totaly. Mine 1mm skimmed Mahle's have just a little bit less left og the pocket than those on the pic. Maybe 0.75mm or 0.50mm skimmed those on the pic

 

i had skimmed mahles on my old engine, and they didn`t look like that. they only had a little left of the valve pocket. i got a pic somewhere if that helps

 

Those pockets are massive, they are never mahles.

Mahles will have the Mahle logo cast up inside the piston.....get your torch and magnifying glass out.

 

the name should be under the crown of the piston,by the looks they have not been skimmed,you lose most of the valve pockets

 

i know mate but ive not bought it yet an dont think the owners gonna rip it apart

can any one confirm its low comp just by looking at how much the pistons stick out the top of the block

 

Have you asked the onwer of this to prove some receipts for these pistons?

If not leave it alone

 

this was my pistons on my old engine, and dont ask why the pistons are different, it must of had a bad engine build by someone, but i have built a new engine now.

this was a AE piston, skimmed to low comp.



these where mahle ones skimmed



the pistons prity much where level with the face when in TDC.

 

I was thinking they were AE Federal Moguls anyway, now ive seen those pictures id be willing to place money on it.

Lee, yes you should be able to tell if they are skimmed or not by how much they sit proud of the black face.

 

well if safechav is right, and there AE Federal Mogul pistons stay away, the one in my pic (the one with the pocket still in it) lasted 2k miles before cracking down the side. And speeking to Burton about them, they said there made of chocolate and very very weak.

 

Thats all they can really be, Mahles and AE's are the easiest pistons to acquire, although i have heard a few bad things about both the AE pistons and rings for the CVH now.

 

ive got some more info on the engine

its a Stage 1 1.6 Exchange Turbo Engine from specialised engines

anyone know what pistons they use ??

 

quote from there website

but mahle dont make low comp pistons do they ?

 

does the standard rs turbo pistons have pockets or are they totally flat?

 

Well the pistons in an RST are low compression compared to the pistons fitted to a N/A block. Thats probably what they mean!

Yes standard RS Turbo Mahles have very small pockets.

I bought these ones brand new, so this is DEFINATELY what a set of standard Mahles look like (yes i know they are dirty before anyone comments )

 

cheers safe chav ,my old bottom end was supposed to have been rebuilt at well lane turbo centre...i have the recipts for all the work but you know yourself it don't count for jack, the guy told me it was running mahle low comp pistons..i thought the 0.5 over sized one i did not realise that they did the standard rst piston as well the pics you've posted look exactly like the ones in my bottom end..

 

cheers safe chav ,my old bottom end was supposed to have been rebuilt at well lane turbo centre...i have the recipts for all the work but you know yourself it don't count for jack, the guy told me it was running mahle low comp pistons..i thought the 0.5 over sized one i did not realise that they did the standard rst piston as well the pics you've posted look exactly like the ones in my bottom end..

 

Those are 0.5mm oversize aswell. Thats only the diameter of the piston, which allows you to hone the bores to get ride of any scoring/lips/wear

 

ah ok ..ach well it's handy to have lying about any way wots the spec of that cabby in your sig?

 

Standard

It did have a power engineering sx428T cam but that bit the dust after quite a thrashing one day.

The head has had some porting and polishing work done along the lines somewhere, a scorpion and a K&N. Standard boost it does the limiter in 5th like that so it cant be bad