F20 oversize pistons

dep

Member
What 4" or other oversize pistons will fit in an F20? I've got 3-3/4 sleeves. Rice has some but they are $480 for 4. Wondered if i could retro fit something cheaper? Deere 3010?
 
Bore size should be easy to find, but finding a set that has the wrist pin the same size, and in the same place.
 
That may be tough to find. It is easy to find 4" pistons and the wrist pin size is not a big deal as it is easy to make a custom sized bushing. The problem is finding a piston with the correct compression height, which is the distance from the top of the piston to the center of the pin. If the compression height is less than original you loose compression, which you don't want as this engine is low compression anyway. A little more compression height won't hurt, as long as the top ring does not pop out of the sleeve at the top of the piston stroke.

You are going to have to locate a piston specification book and start looking through it to see if you can find a piston that will work. I tried doing this several months ago and was unsuccessful. The pistons I found in the book that would have worked turned out to be no longer available.

The set from Rice may not be that bad of a deal considering that you know they are the right pistons for an F20, plus they come with rings.

You can also keep an eye out for used 4" pistons out of an F20, they show up for sale occasionally here on YT or ebay.

Deere 3010 gas pistons are 4" diameter, they MIGHT work, you will just have to find out what their compression height is.
 
I wouldn't be afraid to run a piston without a top ring if you could find one that was ok in all other dimensions but just had a compression height that was higher and the top ring land was past the top of the sleeve, that combustion chamber is huge , and I think it would be ok as long as it still had 2 compression rings and the oil ring . If you find such a piston , I will try it .
 

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