Blown flathead guys - ring gap qun...

What do you guys use for top/second ring gap sizes for a blown FH? Rings are plasma moly

This is an 8BA, 3 5/16" x 3 3/4" with Ross forged, 3 ring pistons.

Rat

 

Anyone ?

Any input here would be a great help !

Rat

 

Too late I'm sure but I prefer gapless rings for a blower motor.

Can't give you a number I'm afraid. Look in the book or call the manufacturer's tech line?

 

Have the manuf details in the box - but Im curious for real world experience with these pistons/rings in a blown FH.

Blown 49, Bored & Stroked, Bruce L ?

Rat

 

Hi Rat
What i always use is Top ring 0.004 x bore plus 0.004 for blown engines = .017
Second ring 0.005 x bore plus 0.004 for blown engines = .020
Hope that helps
Cheers Jim

 

Sorry Rat i can't give you any useful info other than I have used 0.003" per bore circumference!

Jim

 

Thanx BJJ.....

Rat

 

Read the instructions.

 

I agree with Jim and you can't go wrong with these figures.