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      06-19-2016, 09:51 PM   #1
deansbimmer
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Piston selection: S65 94mm on Alusil bores

I'd like to learn up on sources and tech for an engine build I'm starting. I've successfully built a couple of stock S65 which are still running strong but this is the first time I'm going to need aftermarket pistons for one.

I have a remanufactured S65 block with original AluSil cylinders that Dinan bored and honed to 94mm. Other than the increased bore, my plan is to assemble it mostly stock while addressing the engine's weak spots (rod/main bearings, valve springs, etc). It is going in a 2011 E93 M3 I'm putting together for my wife so I want to be confident in the components.

Therefore I need to source some pistons, which probably won't be an off the shelf product. Of Mahle, CP, and JE, so far I've only got an estimate on a set from JE (forged alloy w/ ferro coating) at $3k and 3 weeks, per VAC. I don't know what Dinan can offer for their block because they have been impossible to contact and don't return messages (Very frustrated at them right now).I would prefer Mahle but don't know who has experience in ordering them for the S65.

What other knowledgeable sources could I contact? Do any of the forum's engine experts have any input or advice? This is the only component I have to lock down before I can start assembly. Thanks in advance
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      06-19-2016, 11:33 PM   #2
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Dinan sell a 94mm rebuild kit i think
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      06-20-2016, 12:08 AM   #3
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We can order Mahle pistons for any custom configuration you like. We also have experience having Mahle custom make pistons when your block is already bored and honed. Usually you have the block bored to the pistons, not make the pistons made to fit the block. We can help either way. PM me for details.
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      06-20-2016, 12:16 AM   #4
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Quote:
Originally Posted by Green-Eggs View Post
Usually you have the block bored to the pistons, not make the pistons made to fit the block. We can help either way. PM me for details.
Understood. That's partly why I'm so frustrated at Dinan. They have the specs from the block job so Pistons could be ordered later. I've been trying to get ahold of the guy (or anybody) for almost 2 weeks now with no luck. Pm sent.
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