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Re: 620 all fuel pistons

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mike m

06-29-2013 05:58:20

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There's a good chance it has allready had gas pistons installed.
Also a good chance it has broken top piston rings. Those models it is a common problem due to alum. Pistons and high hours they get.

If all of the allfuel parts are keep intact what's wrong with gas pistons and just running gas? One could likely just mill some off the top of the gas piston to lower the compression? You would have to compare to all fuel ones to check on if this is possible.

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06-29-2013 07:48:16

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 Re: 620 all fuel pistons in reply to mike m, 06-29-2013 05:58:20  
Broken rings could also be from detonation. Somebody may have tried to run low octane fuel on gasoline pistons.

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mike m

06-29-2013 11:36:40

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 Re: 620 all fuel pistons in reply to buickanddeere, 06-29-2013 07:48:16  
Top ring grooves wear plus thin rings plus flexing in worn bores equals broken rings. Seen them run so long the pieces wore their way up to the top of the piston and started beating against it.

Never seen broken rings in the like model A with cast pistons and thick rings.

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