installing rings in piston grooves



installing rings in piston grooves

Postby grumpyvette » July 30th, 2013, 11:57 am

obviously if you've been around engine rebuilds, long enough, your aware that you'll eventually see guys installing rings in piston grooves by spiral twisting them into place, like the picture below depicts
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the problem, with that method is that its not at all difficult to leave the piston ring twisted permanently, or warping it to the point it either breaks , or its bent ,degrading its ability to seal against the bore wall.
so its a good idea to carefully use a expander tool, but only expand the ring enough to install it.
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http://www.summitracing.com/parts/shc-94662
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if you have oil ring expanders with the plastic bits,they are there to prevent you from over lapping the ends of the oil ring expander, theres some oil ring expander s that are vertical ,some horizontal, but all have the ends butt , none over-lap
related info

http://www.manleyperformance.com/dl/tec ... -rings.pdf

http://www.rosspistons.com/information/ ... lation.pdf

http://www.circletrack.com/enginetech/1 ... education/

viewtopic.php?f=53&t=3897

viewtopic.php?f=53&t=509

viewtopic.php?f=53&t=5454

viewtopic.php?f=53&t=2795

viewtopic.php?f=50&t=55&p=98&hilit=ring+compressor#p98

https://www.uempistons.com/installation ... lation.pdf

viewtopic.php?f=53&t=247&p=1089&hilit=ring+compressor#p1089

viewtopic.php?f=50&t=8744&p=30912&hilit=cleaning+piston+grooves#p30912

viewtopic.php?f=53&t=509&p=632&hilit=ring+compressor#p632

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GET THE RING END GAP TOO TIGHT AND WHEN THE RINGS EXPAND WITH ENGINE HEAT THE ENDS TOUCH THE RINGS LOCK IN THE BORE AND THE PISTON LANDS SHEAR OFFGET THE GAP A BIT TOO LARGE AND YOU MIGHT BURN A BIT MORE OIL OR LOOSE SOME COMPRESSION, YOU'LL SEE A CHART LATER IN THE THREAD, BUT GENERALLY YOU'LL WANT .0045-.0065 PER INCH OF BORE DIAM. FOR A RING END GAP

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IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Re: installing rings in piston grooves

Postby 87vette81big » July 30th, 2013, 12:35 pm

I can't even tell you how many Racers & engine builders I have seen twist piston rings on.
At least 2 dozen.
Own a set of Snap On Piston Ring installation pliers.
Not bad on price. $ 25.00
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