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FE Power Forums => FE Technical Forum => Topic started by: 66FAIRLANE on February 24, 2020, 04:56:54 AM

Title: Issue With New Ring Gaps
Post by: 66FAIRLANE on February 24, 2020, 04:56:54 AM

I decided to gap my piston rings tonight. This is a fresh build using a freshly bored 390 block & my existing 040 over L2291F's.

Slipped a top ring into No.1 and squared it with a piston. Gap is between 024-025. Put the second ring in & same deal. This seems excessive to me? Box says 040 but that is the vendors sticker which obscures part of the Hastings sticker. The Hastings sticker only has 4.050 & the ring sizes. I downloaded a QR code reader as that is visible & that came back with '2m574040' which suggests to me they are meant to be 040 over according to the original label. I even put a mic over the feeler gauge & of course no error there.

I then set about measuring bore & pistons. Measured pistons (well one) at 4.089 & the bore at 4.091, which is the .002 clearance we discussed so I can't see any errors there.

Is this gap too large? Ring box pics for shits & giggles below.

(https://i.postimg.cc/28fPh5wy/20200224_192532.jpg) (https://postimg.cc/mh8XGBKW)

(https://i.postimg.cc/zXS4j1tj/20200224_192541.jpg) (https://postimg.cc/7fhBHjyG)

Title: Re: Issue With New Ring Gaps
Post by: Barry_R on February 24, 2020, 05:58:55 AM

Those are normal rebuilder style rings.
Race stuff would be different. 
Ring gaps of .024-.025 are perfectly normal.
You'll be fine.

Title: Re: Issue With New Ring Gaps
Post by: 66FAIRLANE on February 24, 2020, 06:04:24 AM

Thanks Barry.