Can someone give me some advice on these pistons i have , they are Mahle , stamped on the face is sp 0027 , 80,443 (oversized .50mm) with 86 T and an arrow. Question being are these forged or cast?

Any help much appreciated.

Cheers

Ken

 

Any writing inside the piston?

 

Yea , there is Mahle with A1 under it , 80v157+ to the left of the word Mahle , theres also a p 031, a 16 with a 7 under it enclosed in a circle and the number 80st138 stamped inside.....oh and on the face there is a stamp with made in Germany and 515 stamped....

 

coincidence or what i happen to have the same pistons with same markings on ebay,would like as much info about these too

 

The standard Mahle RST pistons are high pressure cast. A forged is usually shiny in appearence and cast ones are usually dull...

 

Still none the wiser anyone got a nice picture they can put up of a standard Rs Turbo Mahle Piston , so i can compare with mine.

 

That one in my siggy is a forged Cossie piston...

I don't have piccies of standard ones though..

 

Here we go... one set cast, one set forged.

Standard pistons...





Cossie forged...

 

CheeRS Daz , i think going of the pics my ones are most likely cast , but if anyone has a nice picture of a mahle forged one then please show us . By the way Daz them pistons and rods are the muts nuts

 

At least you know!

The rods and pistons cost a fooking mint too! Not much change out of 1.5k but that also buys a little bit of peace of mind...

 

whats the deal with these then as they're shiny, mahle but yet come under the cast section of burton powers catalogue

Scott

 

Tell me about it Scott , in the Burtons catalog the pistons are called Mahle/Forged then on there online catalog they come under the Cast pistons section, same part number ... my ones look like both.... god damn confusing....

 

The v stands for cast in german. It would be "p" for forged.

 

Cheers Jesse , Cast it is then ..Just means im not gonna be able to run as much boost as i was planning .

Thanks for everyones help

 

Yeah but how much boost will they take?( mahle cast) i am hoping to run 20 psi with grs and 5th injector, am i dreaming.

 

No you're not if they are of the same type than std. RST pistons. I run 20psi daily and have experimented with upto 30psi with no problems what so ever. I'm running the std. RST pistons and thus standard compression too.
Of course the fuelling and ignition has to be bang on.

 

That's not shiny. It's a dull grey colour. When I said shiny I meant shiny. Almost like chrome....

 

They are nice pistons aren't they Daz

 

who else does forged pistons apart from cosworth and accralite ?

cant seem to find anymore in the UK

Scott

 

Yes!!

Almost a shame to get the oiled up and full of carbon...

JL and Arias also make forged pistons...

 

i brought some Ross Racing pistons the other day for mine 1mm oversize , forged low comp ones from P.T.S nearly 500 quid though, susposed to be good, they put them in drag cars etc.

But untill i get the car back on the road, i dont know how good they are!

 

[quote="grimmeRST"]i brought some Ross Racing pistons the other day for mine 1mm oversize , forged low comp ones from P.T.S nearly 500 quid though

Bloody pts told me they want £570 for a set and a 5 week waiting list

Just ordered some cosworth racing pistons from burton

 

Yeah i was lucky they had one set on the shelf, if not they come from the USA!.

Got the Cosworth ones then!, they are meant to be good according to alan!.

Mine should be back on the road in 2 weeks!!!, thank god.

 

As above there is no true forged Mahle piston.. all there pistons are 'squish' cast for want of a better word (and not knowing the propper term ) the metal is put under pressure into the casting thingio and out comes a harder than normal cast piston due to the metal being forced in so you dont get air bubbles etc in them.

Mahle pistons are good for 30+ psi of boost but they cannot disipate heat as well as a true forged piston and are obviously not as strong.

 

Like I said above...high pressure cast.