The Ford Barn - New pistons

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31 RPU

11-02-2013 06:34 PM

New pistons

Just got a set of new aluminum pistons for my engine rebuild from Brattons. These pistons don't have a slit at all in the skirt. How much clearance do you allow in the cylinder walls for these pistons? Is it the same as the pistons with the slit? There are no dumb questions...right?

Thanks

Tom Wesenberg

11-02-2013 08:03 PM

Re: New pistons

Pistons with the slit can be fit a little tighter. Usually the new pistons have a clearance recommendation with them. Off hand I'd think about .0025 to .0035" would be OK, but wait for Dave or Herm to answer.

J and M Machine

11-06-2013 09:01 PM

Re: New pistons

Correct: on the pistons they do recommend .002-.003" as i contacted them in Taiwan and a few weeks later i received a response.

31 RPU

11-07-2013 05:22 AM

Re: New pistons

Ok, another question. The wrist pins can be pushed in with my thumb. It this ok? I thought they were supposed to be a tight fit?

dave in australia

11-07-2013 06:47 AM

Re: New pistons

Quote:

Originally Posted by 31 RPU (Post 760163)

Ok, another question. The wrist pins can be pushed in with my thumb. It this ok? I thought they were supposed to be a tight fit?

They will need c clips at each end. A full floating gudgeon should move in and out with finger pressure.

31 RPU

11-07-2013 08:07 AM

Re: New pistons

Not sure if I stated that correctly. The wrist pins slide into the piston easily. I thought they should be tight??

They have snap rings with the set. I have already fitted the connecting rod bushings to the wrist pin.

J and M Machine

11-07-2013 08:09 AM

Re: New pistons

You stated it correctly.
They should be easy enough to slide through but not loose enough to fall out.

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