Pistons- Slipper Skirt OK?
Turbo Mini Forums

I had a look at my engine today, and noted that I had slipper skirt type pistons in there. It ran fine, when it was together, but I was also running the stock 5 or 6 pounds of boost. I plan on eventually running 15 pounds, though. Will a slipper skirt piston be a problem? Should I buy new, turbo-specific pistons?

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1967 Cooper 's' Turbo build @ www.drjing.com

I can't say to be honest, but all modern cars have got slipper pistons. All A+ engines did as well, APART from the turbo..

Theoreticly, the full skirt ones will be more stabile, but are they overkill??

Yes, that's what I'm concerned with. Every turbo piston I've seen is non-slipper skirt, and I believe it's because of the greater pressures on the pistons. So, if they go out of round under high boost, that would be a problem! But you're right: Is it overkill?

No one knows?

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1967 Cooper 's' Turbo build @ www.drjing.com

Thanks for the tip, mini1071s! That's not a bad price, either! Do you have a link for them?

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1967 Cooper 's' Turbo build @ www.drjing.com

any numbers on the ones you are using ?
21251 shite, 21253 resonable but far from ultimate ,

Thanks, Stuart. When I get the engine back from the machinist, I'll check the numbers. All I know is that they are 20 over, and I have a set of 30 overs and 40 overs. Don't know numbers on any of them... I'll see what I have.

Thanks for the link, mini1071s. I'll give them a look-see, and definitely consider buying if anything happens...

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1967 Cooper 's' Turbo build @ www.drjing.com