Oil Expander Ends - Positon/Phasing on Piston Important?
 

Hey Everybody,

I think that I positioned the ends of the oil expander over the pistion pin instead of the skirt.

Does it matter?

I think I had better STOP working in the garage late at night!

Thanks Again,
Craig

Re: Oil Expander Ends - Positon/Phasing on Piston Important?
 

If you look at it like a clock, and the exhaust side skirt is 6 o'clock, that's where I like my expander gap, the two rails I like at 2 and 10. Yes, I think it is important. If I think I missed location on one, I'll take it back out every time.

Re: Oil Expander Ends - Positon/Phasing on Piston Important?
 

may i ask why alan?

Re: Oil Expander Ends - Positon/Phasing on Piston Important?
 

I've been putting the expander end gap over the pin for close to 50 years with no issues.

Re: Oil Expander Ends - Positon/Phasing on Piston Important?
 

Upon disassembly have you inspected if rings or rails have rotated?

Re: Oil Expander Ends - Positon/Phasing on Piston Important?
 

They always move anyway. I always say the best way to insure the top two end gaps don't line up is to install them that way. (lined up)
They never stay where you put them anyway.

Re: Oil Expander Ends - Positon/Phasing on Piston Important?
 

I always like that oil use reasoning of ring gaps must be lined up,DUH big dummy compression,oil can't travel around to other side and go through that gap it can only go leak through lined up ring gaps.LOL
I usaully keep all gaps turned away from skirt sides and stagger from one side to other,IE top ring to front 2nd to rear 1st. oil rail front 2nd oil rail back,how long they stay that way don't know,do they rotate at same rates don't know that either.
Maybe I can hone cyls.alternating clockwise& counterclockwise according to firing order so that rotation of rings has one piston pushing and one pulling and create perpetual motion LOL crap I let the cat out of the bag before I patented it and had Pro Stockers paying thousands of dollars for my top secret cylinder honing.
Mike Taylor3601

Re: Oil Expander Ends - Positon/Phasing on Piston Important?
 

Hey Everybody,

I aligned all the rings according to the Sealed Power instruction sheet. When I installed all of the pistons - 2 or 3 of them ended up with the the oil ring assembly being rotated so that the expander end gaps were pointed toward the pin. The Oil Scraper ring ends are all spaced correctly.

Well, would you take it all apart to re-postion that oil ring assembly?

Thanks Again, Craig

Re: Oil Expander Ends - Positon/Phasing on Piston Important?
 

I wouldn't. They hardly ever (more like never) stay where you put them anyway.

Re: Oil Expander Ends - Positon/Phasing on Piston Important?
 

GM spent millions trying to figure that one out. Remember the problems with 307 and 396 oil useage? Ring placement and rotation speed during break in was part of the problem. Some engines rotate the rings at a real slow rate, others faster. The method of placement GM found is now put in every Mahle/CP/Clevite ring box on a little green piece of paper. I could get Real Technical, but for time sake... Just use their little paper. It works.