Wiseco Wire Lock Installation

CyFi6

CyFi6

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Oct 11, 2007
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Just want to be 100% sure I am installing these right. I havent been able to find any detailed install instructions for these, but from what I read around the net is to put the opening in the lock about 90 deg from the slot in the piston. Is this correct? One of my OEM pistons I pulled out of my MR2 a while ago used wire locks and the end of the lock was lined right up with the slot in the piston.
Here is a pic of the first one I installed.
Thanks
p1835865_1.jpg
 
CyFi6

CyFi6

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Just finished putting all of them together, so its hard to see the end of the pin, but there looks to be a small chamfer on the ends of the pin. They should be the correct groove since these locks came with the piston kit.

Edit just looked at my other set and yes there is a chamfer on the pins.
p1835879_1.jpg
 
CyFi6

CyFi6

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Makes sense. Ive got another question about my ring gaps. I used your formula IJ that I found when searching (.004" per inch of bore for top ring, .005 for bottom). The target ring gaps for me would be about .013" top and .017 bottom. Measured ring gap out of the box is .011" top and .023" bottom. As you can see I have a problem, the bottom ring gap is already too large. I measured the piston (3.3055") and the bore (3.3081") which gives me a perfect .0025" clearance that Wiseco spec sheet calls for.

The "bore size" listed on the spec sheet is "3.070"", but using the circumference formula (pi*d=c) even if my bore was exactly 3.3070" my 2nd ring gap would be about .020", still bigger than desired. Is it a big deal that my second ring is at .023"-.024" gap? Should I contact Wiseco? Thanks.
 
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IJ.

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Mar 30, 2005
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CyFi6;1836014 said:
Makes sense. Ive got another question about my ring gaps. I used your formula IJ that I found when searching (.004" per inch of bore for top ring, .005 for bottom). The target ring gaps for me would be about .013" top and .017 bottom. Measured ring gap out of the box is .011" top and .023" bottom. As you can see I have a problem, the bottom ring gap is already too large. I measured the piston (3.3055") and the bore (3.3081") which gives me a perfect .0025" clearance that Wiseco spec sheet calls for.

The "bore size" listed on the spec sheet is "3.070"", but using the circumference formula (pi*d=c) even if my bore was exactly 3.3070" my 2nd ring gap would be about .020", still bigger than desired. Is it a big deal that my second ring is at .023"-.024" gap? Should I contact Wiseco? Thanks.
Click to expand...

Depending on expected output of the engine I'll add a few thou to whatever I come up with, I wouldn't have an issue running 23 on the 2nd ring.
 
CyFi6

CyFi6

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Ok sounds good then, I wont worry myself over it. Do I need to match the top ring by opening it up, or should I be fine filing the top just to .013"-.014"?
 
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IJ.

Grumpy Old Man
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You want the top ring slightly smaller in gap (used to be the other way around then someone found with thin rings it would casue flutter so now we set 2 bigger so it can outleak 1)

I'd probably shoot for 17/18ish on the top and make sure you dress up the ends after filing, I used to use a diamond file and a tiny hobby vise but bought a proper ring filer as it gives a much squarer job.
 
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