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Garage19

Was wadding through the piles of crap on my hard drive and found this copy of a letter from Mahle stating how to distinguish the manufacturing process of one of their pistons.

I know they are used in the LET so thought it might be of interest.

In the inside of every MAHLE - Piston you can find a casting number.
This number consists out of two numbers, then a letter and again two numbers.
From the letter you can find out of what kind the piston is:

D... Duotherm piston
F... Squeeze-cast piston
KB... Ferrotherm piston
L... Solid skirt piston
P... Forged piston
V... Auto-/Hydrothermik piston/
Auto-/Hydrothermatik piston

For example: A piston with the casting number 96 P 26 would be a forged piston.

Mit freundlichen Grüßen / Kind Regards

Claudia Richter
MAHLE Aftermarket GmbH
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tathan · Posted: Fri Aug 24, 2007 10:38 pm Post subject:

That should put a few urban myths to bed forever Thumbs Up

good gen!

Spanishfly · Posted: Sat Aug 25, 2007 2:25 pm Post subject:

Nice gen!
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ChrisR · Posted: Wed Aug 29, 2007 11:58 am Post subject:

stupink · Posted: Wed Aug 29, 2007 8:03 pm Post subject:

Cool, so the let ones are true forged pistons afterall not squeeze cast.

jimspeed007 · Posted: Mon Sep 10, 2007 1:35 pm Post subject:

thats cool then.. i seem to have 2 sets of forged c20xe pistons according to that then.

Eck · Posted: Fri Sep 14, 2007 1:29 am Post subject:

So LET pistons are 86P47+ clap

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wayne451 · Posted: Fri Sep 14, 2007 2:37 am Post subject:

So the first lot of numbers are the bore in mm then? Whats the second lot about or have I missed something? Only seems to be info about the letters?
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Stanley South Africa

Stanley South Africa · Posted: Mon Dec 31, 2007 11:53 am Post subject: Auto -hydrathermik pistons

Anyone
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inboost · Posted: Sat Jan 05, 2008 6:55 am Post subject: nasen nascar +27 11 4933958

The 20let pistons were good for about 300 - 400 Hp
we had issues with ring lands

we now use ross pistons and make over 800hp
have stock in SA

if you have to use this piston rather drop rod 1.5 mm on bigend
or use MLS gasket stacked up

leve the piston as is

kc · Posted: Mon Jul 28, 2008 2:06 pm Post subject:

quite usefull that wher abouts on the inside of the piston i cant see any on mine