After many hours research and consulting OCS, I decided to try something somewhat new with my piston rings.
I have decided to run Total Seal Gapless pistons rings. The setup includes a gapless top ring, with conventional second and oil control rings. To my knowledge I’m the only person in the UK to be running gapless rings on a VG30, but I know of at least one other in the states that have shown very positive results.
The term gapless is a bit of a misnomer. It’s a 2 piece ring, with their individual ring gaps rotated 180 degrees from each other, effectively making the area around the ring gapless. The positives include virtually 0 blowby (so a 0-1% leakdown vs 5% on a conventional ring), increased vacuum and reduced oil fuel dilution. The other benefit is you can run a larger ring gap on the 2 pieces, allowing the a wider margin for thermal expansion without the downside of increased blow by
The only real downside that I can see is the cost, at around 30% more than a CP Piston ring pack.
Hopefully this will help with slightly improving my idle vacuum (due to my cam profile) and a generally more efficient engine.
By
nickz32 ·
Managed to get a good look underneath the car
yesterday whilst the engine oil was being changed.
There is an oil leak at the rear of the car
just in front of the Diff, checked the Diff oil and this was full, i have done a
search on the forum and there are a few references to this being the propshaft seal?
Anyone had this and sorted it?
what was involved and cost?
Also, i have noticed a slight clunk just before moving off, either forward or reverse,
manual TT 91, any ideas what this could be?
is it related to the above oil leak problem?
or something to do with the propshaft?
any info would be appreciated.
Cheerz
Ian.