Guys,



I started working on this old stock car motor from the late 50's early 60's that I picked up a while ago and I need help with a couple of things.



First: What should the ring gap be for the first and second rings?

Second: If the rings I have are to far out where can I pick some up?



The Janns pistons have 1/16 LC stamped on them.



Thanks YGuys!!!

Brian

Brian

Piston rings really do not care what piston or what motor the go into. They care about ring grove width as in 1/16 of an inch and the ring manufactures advise about .004 Of an inch FOR EACH inch of piston diameter as a minimum and more for a maximum. The website of the piston rings you choose will tell you.

What kind of gas are you thinking of running in your engine? Pete

 

 

Mr Gates did it again. Damm

Pete,

I will be running 100+ octane, this will not be a street motor.

I found this info on the Hastingsmfg.com:
http://www.hastingsmfg.com/Race_Catalog_Pdfs/File_Fit_Plastigage.pdf 

Thanks for your time,
Brian

When I needed rings for my odball .0425 over 312 pistons, I made a phone call to Grant Piston Rings and talked to their tech guy. He put togeather a set for me for a little over $100 + shipping.

To add to what Pete has mentioned, you’ll need to verify exactly which ring widths are required in your pistons.  Many of the older Jahns pistons used the original ring widths of 5/64, 3/32, & 3/16.  But it’s entirely possible that your set of pistons is different than this.  Once you’ve determined this, then either going through the ring selections in the catalogues or getting with the ring manufacturers themselves can get you a set of rings.

 

Rule of thumb for ring end gaps is 0.004” per inch of bore for the top ring and 0.003” per inch of bore for the second ring.  Maintain at least 0.015” gaps on the oil ring rails.  Boosted or nitrous applications will require more gap.

Lorena, Texas (South of Waco)

Ted;

So how much more ring end gap is needed for a supercharged motor?

Thanks,

Rono

  Ron Lane,  Meridian, ID

Ted, so far the ring gaps are close to the Hastings Ring End Gap Factor chart that I have linked above, .008" for circle track, mine are coming in at .032"-.035". I guess I should get some new rings.



I will be running a Offy 6 X 2 or a Edelbrock 257 with Edelbrock 1405 carbs but I'm not a big fan on how they look on the intake and would like to replace them with the Carter WCFB so with that said I would trade my Ed's for the Carters.



Thanks again all, I will keep you updated on this vintage build.