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Re: Alusil Pistons
Posted: Wed Jul 08, 2026 5:11 am
by Bergerac
Tom wrote: Tue Jul 07, 2026 8:20 pm
Bergerac wrote: Tue Jul 07, 2026 7:50 pm
blade7 wrote: Tue Jul 07, 2026 4:16 pm
Someone on the PCGB forum used Mahle Motorsport pistons for their Alusil rebuild within the last couple of years I think. I'll admit I was sceptical and posted that, but it seems it's all good. So showed how much I knew.
I've got Mahle Motorsport pistons in my alusil build, no problems so far. Not the cheapest option though
Did you custom order them?
Mine were custom order, they have some 8V options off the shelf but only in oversize. My buildsheet wont help, theyre for a 3L 16V and they were built off the measurements for my block & CR target. It really is an easy process to complete thier custom order form, they have enough designs on file to fill any gaps you have.
https://www.us.mahle.com/en/motorsports ... ston-sets/

- Screenshot 2026-07-08 200549.png (118.63 KiB) Viewed 33 times
Re: Alusil Pistons
Posted: Wed Jul 08, 2026 8:40 am
by gruhsy
Ah
Thanks
Definitely a special order being 100mm
Bergerac wrote: Wed Jul 08, 2026 5:11 am
Tom wrote: Tue Jul 07, 2026 8:20 pm
Bergerac wrote: Tue Jul 07, 2026 7:50 pm
I've got Mahle Motorsport pistons in my alusil build, no problems so far. Not the cheapest option though
Did you custom order them?
Mine were custom order, they have some 8V options off the shelf but only in oversize. My buildsheet wont help, theyre for a 3L 16V and they were built off the measurements for my block & CR target. It really is an easy process to complete thier custom order form, they have enough designs on file to fill any gaps you have.
https://www.us.mahle.com/en/motorsports ... ston-sets/
Screenshot 2026-07-08 200549.png
Re: Alusil Pistons
Posted: Wed Jul 08, 2026 9:18 am
by blade7
It still seems a mystery whether the original Porsche pistons are forged or cast, due to the very low expansion rate?