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Author Topic: Is it worth 'fettling' new cast pistons prior to install?  (Read 534 times)
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mangocrazy
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« on: May 31, 2017, 10:07:27 PM »

I'm slowly approaching the point where rebuild operations can occur on my 2 litre Spider engine, and I have a new set of (allegedly) 10:1 cast Vick-Auto pistons ready to be fitted to the recently rebored and honed block. I was wondering whether to fit the pistons 'as is' or whether it's worth using a Dremel and various abrasive wheels to remove any sharp edges, casting flash and areas where there is unnecessary extra material? At the same time I was thinking of ensuring that all pistons weighed the same down to 1/100th of a gram using a set of digital scales I have.

Is this worth doing, or is it unnecessary or even unwise? I'd only be removing material from non-bearing surfaces and would only be removing modest amounts of material.
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peteracs
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« Reply #1 on: June 01, 2017, 06:23:22 AM »

Hi

From what I have read, sharp edges in the combustion chamber leads to hot spots, so should be avoided.

If you are going to the bother of balancing the pistons then I would suggest also doing the con rods etc.

Peter
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WestonE
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« Reply #2 on: June 01, 2017, 10:12:02 AM »

Fit as is unless you have a valve to piston clearance issue in which case have the valve pockets machined after your dry build check.

Eric
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