Quote:
Originally Posted by oil pan 4
Trust me you don't want to use total seal pistol rings on a street driven vehicle.
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Really? What was your experience?
I have not used them on my re-builds, but am thinking I would on one of the engines I have awaiting rebuild. (I have a couple 1.6IDI VW diesels that need rebuilding)
I have talked to a couple of guys that sent in a set of OEM (Mahle)top (compression)rings to Total Seal for modification, to become "Gapless" rings. Total Seal recommended that they not modify the other two Mahle rings, so they used the conventional Mahle middle and bottom (oil) rings when rebuilding their VW IDI diesel engines. They found that compression was greatly improved when the engine was cold,(490PSI across all cylinders) which massively helped with starting) and they found that oil contamination, as measured by a lab, was reduced pretty dramatically- oil life was extended by at least 2X.
They have been running their engines for 7+ years now, I haven't heard of any issues. I know they were thinking that the modified top rings would produce less wear on the overbored cylinders.
As you know, that can be a problem - once you overbore, it is pretty common for your cylinder wear to increase, as compared to the original engine cylinders, because the underlying metal of the cylinders is just a bit softer.