85.95 RINGS

10 posts · joined Jul 2009 · 12 Nov 2009, 3:35 pm

#746929

i hope i am not Robinson Cruso here, when i pulled my 1600DP top end apart i found forged pistons marked and measured at 85.95 in matching barrels. i have reassembled
with stock size 85.5mm rings because that's all i could find.
does anyone know where these pistons may have come from and where the hell do i get rings the correct size for them?Sorry no pics but from memory they were Mahle.

13bwagon Officially Full-On Dubber

316 posts · joined Nov 2006 · 12 Nov 2009, 4:59 pm

#746939

did you put one of your new rings in the barrels to check the gap?
im not sure what the min gap you can run the closer the better!
sorry not much help

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13bwagon Officially Full-On Dubber

316 posts · joined Nov 2006 · 12 Nov 2009, 5:00 pm

#746940

now that i think about it i have some over size rings here i will dig them out

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1500S Custom Title Time!

1,418 posts · joined Mar 2005 · 12 Nov 2009, 8:01 pm

#746964

POOR BUGGER wrote:i hope i am not Robinson Cruso here, when i pulled my 1600DP top end apart i found forged pistons marked and measured at 85.95 in matching barrels. i have reassembled
with stock size 85.5mm rings because that's all i could find.
does anyone know where these pistons may have come from and where the hell do i get rings the correct size for them?Sorry no pics but from memory they were Mahle.

That's 0.5 mm oversize on the piston so by puting standard rings in you have simulated a set of worn out rings! Too much gap and most likely will be out of round.

DH

grumble Son of Jim - Creator of Good

2,672 posts · joined Jun 2008 · 12 Nov 2009, 8:06 pm

#746967

As a rule of thumb over the years the gap was .004" per inch of diameter and 1500s is right you have achieved nothing. You will need to get a set of .5mm o/s rings.

POOR BUGGER Learner Dubber

10 posts · joined Jul 2009 · 16 Nov 2009, 9:27 am

#747631

Thanks for the replies, I realise the gap is too big. I need to source over size rings.
The engine is just a stop gap untill the minister of finance gives me a better VW budget🙁