The Ford Barn

Scottie · 10-19-2017, 02:52 AM

I have a 39 91A that Im rebuilding and looking for a set of rings 4 ring domed piston .0825 oversize - stamped on piston crown (3 1/16 bore std) The pistons are marked and are Ford branded, no problem getting 80 over but would no doubt be undersized by 12 thou on a worn bore at least (4-6 thou wear) The only ones I can find are early tractor ring sets but they are 3 & 3/16 bore. Otherwise do these 24 stud 3&1/16 blocks go out more than 80 or sleeve? Any help appreciated Cheers Scottie

flatheadmurre · 10-19-2017, 03:52 AM

Contact Egge they atleast used to be able to supply them.

JWL · 10-19-2017, 06:06 AM

The typical use for the .0825 pistons was in sleeved blocks when the sleeves were removed. Both the 3 1/16 and the 3 3/16 bore engines had the .0825 oversize available.

Better do some wall thickness investigating, however, several 3 1/16 engines have been taken to 3 3/16.

rotorwrench · 10-19-2017, 09:04 AM

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Sleeves can be installed but the tin can types are no longer available. This would require standard thick wall sleeves but the cost could be up there these days. It used to be around $100 per bore to machine & install for sleeves but it may be higher now.

10-19-2017, 02:52 AM	#1
Scottie Junior Member Join Date: Jun 2014 Location: Hawkes Bay, NZ Posts: 16	Piston Rings I have a 39 91A that Im rebuilding and looking for a set of rings 4 ring domed piston .0825 oversize - stamped on piston crown (3 1/16 bore std) The pistons are marked and are Ford branded, no problem getting 80 over but would no doubt be undersized by 12 thou on a worn bore at least (4-6 thou wear) The only ones I can find are early tractor ring sets but they are 3 & 3/16 bore. Otherwise do these 24 stud 3&1/16 blocks go out more than 80 or sleeve? Any help appreciated Cheers Scottie

10-19-2017, 03:52 AM	#2
flatheadmurre Senior Member Join Date: Apr 2015 Location: Sweden Posts: 3,045	Re: Piston Rings Contact Egge they atleast used to be able to supply them.

10-19-2017, 06:06 AM	#3
JWL Member Emeritus Join Date: May 2010 Location: Fitzgerald, Georgia Posts: 2,204	Re: Piston Rings The typical use for the .0825 pistons was in sleeved blocks when the sleeves were removed. Both the 3 1/16 and the 3 3/16 bore engines had the .0825 oversize available. Better do some wall thickness investigating, however, several 3 1/16 engines have been taken to 3 3/16.

10-19-2017, 09:04 AM	#4
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,497	Re: Piston Rings Sponsored Links (Register now to hide all advertisements) Sleeves can be installed but the tin can types are no longer available. This would require standard thick wall sleeves but the cost could be up there these days. It used to be around $100 per bore to machine & install for sleeves but it may be higher now.