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Post by royldoc on Apr 4, 2011 10:19:33 GMT -6
I'm doing a bbk upgrade and the set of rings I got have no marks on them at all. one is a copper color one is black and the oil ring set. Now I have installed many sets of rings on various types of engines. So I know that rings have a beveled edge and they must be installed with the bevel in the right direction. They are usually marked on the side that goes up. I'm guessing the copper colored one is the top ring. As I look at the edge of the rings I can't determine which way the bevel goes.
Roy
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Post by robb on Apr 4, 2011 10:41:56 GMT -6
With 35 years experience with pistons and rings I say the bevel goes up.
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Post by royldoc on Apr 4, 2011 10:55:29 GMT -6
Yes robb you are correct the bevel goes up. but my problem is when I look at the edge of the rings I can't see the bevel. I even used a very large 8x magnifying lens.
Roy
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Post by robb on Apr 4, 2011 16:03:28 GMT -6
Combustion gasses will always get behind the top ring bevel or not. If the second has no bevel then it will be a sort of low tension ring probably doing more for oil controll than anything else. I wouldn't let the lack of a bevel keep me from installing them. They may have some reason for not having a bevel, inscrutable to westerners.
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Post by wildman on Apr 4, 2011 16:54:27 GMT -6
Some GY6 rings don't have any bevel at all... Some GY6 rings have the bevel on the bottom edge of the rings, & some Herve a bevel on both top & bottom... Some GY6 rings have no marks indicating top or 1st or 2nd ring... If there's no indicators I wouldn't worry about up or down, if one ring is chrome or silver or color I'd use it as 1st ring... & of coarse set gap acordingly...
David Sr.
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Post by sprocket on Apr 4, 2011 17:09:59 GMT -6
And hone the cylinder walls. I just met a guy that did a complete engine rebuild and he didn't use a hone... ugh
I guess he will get a second chance in about 3000 miles...
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Post by wildman on Apr 4, 2011 17:18:43 GMT -6
If it's a new bore kit, shouldn't need honing... You only need to hone used cylinders to get rid of the glazing & for seating new rings in use bore...
David Sr.
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Post by sprocket on Apr 4, 2011 17:37:39 GMT -6
Sorry Dave you are right... I missed the 'bbk' part.. I thought it was a rebuild using the old jug...
Good to see you here after a long winter
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Post by wildman on Apr 4, 2011 17:42:37 GMT -6
Yep, still a lot of up & down weather here for a month or so yet, but hoping to get a few ride in this month...
David Sr.
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Post by sprocket on Apr 4, 2011 17:50:30 GMT -6
David when are you going to loose those training wheels? ;-)
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Post by wildman on Apr 4, 2011 17:56:30 GMT -6
I loose the training wheels from time to time...
David Sr.
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Post by royldoc on Apr 5, 2011 12:05:38 GMT -6
Hey guy's thanks for the input. This is a new jug so I don't need to hone the cylinder. Whenever I do a ring job I always hone the cylinder to break the glaze and put cross hatch pattern on the cylinder walls. This helps new rings seat properly.
Roy
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