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Old 07-29-2002, 04:24 PM
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Join Date: Nov 2001
Location: Atlanta, GA
Posts: 553
Piston Rings for forced induction

Can anyone recommend piston rings for forced induction applications? I will be running a turbo with around 16lbs of boost. Thankyou!
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George Carstens
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Old 07-30-2002, 02:18 AM
They call me Darth Speed
 
Join Date: Apr 2002
Location: Hawaii
Posts: 327
Piston Rings

I have vast experience using Total seal and Deves (also Sealed power and factory german stuff (never know who it is really made by))

Total Seal seals well when the block is prepped to their specs.
I have some turbo cars with over 100k on them and the leakdown is still 2% the highest cylinder is 4%. Most stock rings you would be lucky if you get less than 10%. I set my ring end gaps .0035" per 1" of bore. NON-Turbo I set it at .003" per 1" bore. The #2 ring on the Total Seal is gapless as where they use a oil control ring with the 2nd cast iron ring 180 dregrees apart to
form a no gap 2nd ring. The main thing when installing the rings is to check for binding in the grooves. You can install the rings on the piston and twist them back and forth to make sure they rotate smoothly. (I hope I am explaining this right. It is hard to describe.) Then remove the rings and clean the groove and rings to wipe off any flash. All rings must move freely in the ring lands.
If they get stuck this will cause a compression failure. If it feels tight spray some WD40 and work it back and forth smoothly until it frees up.

Deves has an excellent Top Ring. I some times use Deves 1st and Oil control rings and use Total Seal GAPLESS 2nd ring. The deves 2nd ring has too much pressure applied to the 2nd ring by means of a wavy spring inserted in the 2nd ring land. This causes ring drag.

Chromemoly Top rings are great but require a long break in period. like about 3000 miles before they really start seat. I recommend using straight weight NON-Synthetic oil to break them in for the first 5000 miles.

If you are going to order special pistons you can change the ring groove width also. For turbo I recommend 1.5mm/1.75mm/3mm
groove widths.

GOOD LUCK!
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