piston rings
- Thread starter johnny_k
- Start date
sx_turbo
Lifer
you have to file the rings on the ross pistons,not sure on other makes but id presume so also,otherwise when they warm up theyl expand too much and you'l have problems
this is correct, a few people have been caught out, you need to be very very careful.
it's not an easy thing to do
if they came oversized than they are not for stock bore, which means you still could get the right size ones.
i think youd be better off bringing them to someone who knows what they are doing...
i wouldnt use the same gap as the standard rings,because there simply not the same!!
Dub-Se7en
Lifer
this is the spec according to the sheet i got
Top
bore size in inches (2.913 for you) x 0.004 (spec in book for top ring) + 0.004 (recommended for turbo)
= 0.015652
Bottom
bore size in inches (2.913 for you) x 0.005 (equastion in booklet for bottom ring) + 0.004 (again, for turbocharging)
= 0.018565
should give you your figures in thousanths of an inch
** don't take these figures as gospel! **
i've actually bought a ring grinding machine now, it was such a ballache to find someone who still gaps rings thesedays
Top
bore size in inches (2.913 for you) x 0.004 (spec in book for top ring) + 0.004 (recommended for turbo)
= 0.015652
Bottom
bore size in inches (2.913 for you) x 0.005 (equastion in booklet for bottom ring) + 0.004 (again, for turbocharging)
= 0.018565
should give you your figures in thousanths of an inch
** don't take these figures as gospel! **
i've actually bought a ring grinding machine now, it was such a ballache to find someone who still gaps rings thesedays
Last edited:
Dub-Se7en
Lifer
Ross rings are all supplied unfinished, you have to gap them yourself.
are these 74mm ross pistons oversize or standard?
no even with the 74mm pistons you have will expand,you may need to get your bores measured too,just to be sure that when those pistons expand you dont rip the bores out of it
i think you should bring your block and pistons/rods to someone who knows what there at...just to be on the safe side...if you do it yourself the engine may only last 20minutes
johnny_k
Member +
would this sound correct
.397mm off the top ring and
.471mm off the second ring
iam going to get sombody to do it for me! ring grinders are very hard to find!
H
hoochhenry
Guest
does the ring fit into the engine block if so ,put an old ring off your pistons in the bore too and see the diferenace in the size with feeler gague
Dub-Se7en
Lifer
the stock piston ring gap won't apply here.
H
hoochhenry
Guest
what about wiseco pistons dont they become pre set rings?
johnny_k
Member +
do you file that much off the ring or is that the gap that has to be between them when inserted into the bore?