piston pin lock rings - Team Camaro Tech
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post #1 of 5 (permalink) Old Dec 16th, 08, 10:24 AM Thread Starter
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piston pin lock rings

Has anyone here ever run into a problem installing spiral lock rings in a full floating pin piston?

I'm fighting a set of pistons right now and am almost sure that the ring groove is too narrow for the lock rings that were supplied by the piston manufacturer. It is difficult to measure the width of the ring groove inside the piston. I'm wondering if there are different lock ring widths available?
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post #2 of 5 (permalink) Old Dec 16th, 08, 10:33 AM
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Mike
 
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Re: piston pin lock rings

Quote:
Originally Posted by 67funcar View Post
Has anyone here ever run into a problem installing spiral lock rings in a full floating pin piston?

I'm fighting a set of pistons right now and am almost sure that the ring groove is too narrow for the lock rings that were supplied by the piston manufacturer. It is difficult to measure the width of the ring groove inside the piston. I'm wondering if there are different lock ring widths available?
396/427 Used a .072 spirolox in the old L88 and ZL1 pistons. I think most std size is .062? 283-400 SB all use the same as far as I recall.
Putting in spiro lox is difficult, you have to start 1 tail in carefully spreading the lock and I use a small screwdriver to spin the lock into place around the circumference keeping it seperated slightly as you go.

2.5 pins are hard as the pin is in a long way especially if it is a bigger bore - ie. - 4.155

Check with the piston manufacturer regarding the locks, I kinda doubt they would supply the wrong ones but you never know.

2002 Jerry Bickle Cavalier, 446" Small Block, Brodix Canted Valve, lenco 5 speed, 7.54 @ 180. mph,1.06 60', 2235 lbs for 2014. GM Canada Docs, Highly Optioned 69 RSZ28 , Hugger Orange, White Stripes, 42,000 mile survivor, owned since 1973.
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post #3 of 5 (permalink) Old Dec 16th, 08, 12:16 PM
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Don
 
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Re: piston pin lock rings

My guess is you have a sbc? Most of those are .041 . Your grove should be about that unless you have off brand pistons. I have seen double spirolox , doube E ring and round G rings and lastly ,teflon buttons.
As mentioned above, you pretty much need to start with the tail end of a partially open spiral, then wind in with a small screw driver tip, Once you get the hang of it, no problems.
But if the ring grove is too small, this will not happen. . Need to somehow measure that grove.
And if you use Tru Arcs, install with the sharp edge of the lock , away from the pin.

Don
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post #4 of 5 (permalink) Old Dec 16th, 08, 12:27 PM
SY1
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Dave
 
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Re: piston pin lock rings

Yes there are different thickness locks for different SBC pistons. You need to use the correct ones. Also if you didn't buy these brand new they it's hard to tell what you've got. Some guys had the grooves cut to run double locks. I bought a set of 302 pistons from Yunick that he'd modified to run double locks in. Find out what make of piston you have and visit their website or call their tech line and they should be able to tell you what locks you need.

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post #5 of 5 (permalink) Old Dec 16th, 08, 02:24 PM Thread Starter
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Re: piston pin lock rings

I measured the grooves - approx. .055" wide. The lock rings are .072"

Finally got hold of piston manufacturer - they supplied the wrong lock rings.
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