Quote:
Originally Posted by Keithc8
One thing not mentioned here is the affect of the combustion gases on the rings and how it goes by the rings and turns them. You will almost always see the end gaps lined up on the compression rings on engines that have been run a while and I think this is caused by the combustion gases going by the top ring and turning it as it looks for the gap on the second ring to go by and then turns it back the other direction. I do not think the oil rings move much. |
I pulled an aluminum block 4.6 ltr modular engine, out of a 96 Lincoln that had 105K miles on it. All 8 pistons had the compression ring gaps aligned, but not the
oil rings, as you described. The gaps on all 8 pistons were located in the same spot (say at the 6 O'clock position), as I was quite puzzled by it. At the time I assumed it must have been assembled that way, because I couldn't understand how 8 pistons would have all ended up in the same position.
So this begs the question, why not go to the gap-less ring technology, and eliminate the compression ring gaps?
What is wrong with gap-less rings? I never hear any builders say much about them, and as far as I know, I never heard of a new car manufacturer using them (which they may).