longevity vs performance
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longevity vs performance

This is a discussion on longevity vs performance within the Technical forums, part of the Caferacer.net Forums category; anyone care to make a judgement on whether or not it's okay to rering a stock engine with .25 oversize rings and file them down ...

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  1. #1
    Senior Member roccitycafe's Avatar
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    longevity vs performance

    anyone care to make a judgement on whether or not it's okay to rering a stock engine with .25 oversize rings and file them down to basically stock size to run a tighter ring gap for better compression? I've been told this is a good idea on race motors, but for a stocker it will cause irregular wear on the cylinders and will cause problems over time (not a big deal for racing, but a big deal for a street bike)

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    bfd
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    Senior Member bfd's Avatar
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    Since you have a motor that is easy to get spares for, I'd try to find the right size first. I don't think I'd ever run the wrong size rings on the track. They are not super flexible, squeezing in is as bad as spreading out. I've cracked them during installation being very careful. I'd find the right size for the bore, or go up on the bore if it's between sizes.

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    bfd
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    Senior Member bfd's Avatar
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    Since you have a motor that is easy to get spares for, I'd try to find the right size first. I don't think I'd ever run the wrong size rings on the track. They are not super flexible, squeezing in is as bad as spreading out. I've cracked them during installation being very careful. I'd find the right size for the bore, or go up on the bore if it's between sizes.

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    Senior Member crazypj's Avatar
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    It's different with a 4" bore and wide rings.
    I imagine trying to 'file to fit' 3 piece oil rings on a CB360/350 is going to be difficult?
    I dabble in rocket science, when I\'m not picking my nose
    The other night I gave my girlfriend an orgasm, but, she spat it back at me

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    Senior Member crazypj's Avatar
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    It's different with a 4" bore and wide rings.
    I imagine trying to 'file to fit' 3 piece oil rings on a CB360/350 is going to be difficult?
    I dabble in rocket science, when I\'m not picking my nose
    The other night I gave my girlfriend an orgasm, but, she spat it back at me

    'you can take my word for it or argue until you find out I'm right'

  7. #6
    Senior Member HackAsaw's Avatar
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    If the rings that are actually for your bore size don't require filing to obtain a SAFE gap....

    they are probably crap anyhow


    lemme give ya a million dollar clue


    Total Seal Gapless second ring and top if likely available....


    Do you understand why conventional rings must have an adequate gap? My guess is you do not or you'd realize it's more important on a race engine.
    Accidental inventor of the worlds fastest wearing rocker arms and other edible engine parts! Try my yummy blue cheese camshafts!

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    Senior Member HackAsaw's Avatar
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    If the rings that are actually for your bore size don't require filing to obtain a SAFE gap....

    they are probably crap anyhow


    lemme give ya a million dollar clue


    Total Seal Gapless second ring and top if likely available....


    Do you understand why conventional rings must have an adequate gap? My guess is you do not or you'd realize it's more important on a race engine.
    Accidental inventor of the worlds fastest wearing rocker arms and other edible engine parts! Try my yummy blue cheese camshafts!

  9. #8
    Senior Member roccitycafe's Avatar
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    i was planning on filing to the lower clearance spec per the shop manual, pj's right, the rings I got were probably crap and too loose. I do understand the different expansion rates of the cylinder, piston and rings...

    I looked at total seal's design, it's really genius, the article they wrote up on the dyno seems the proof is in the pudding, I'll have to see if they have rings to fit the 350

  10. #9
    Senior Member roccitycafe's Avatar
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    i was planning on filing to the lower clearance spec per the shop manual, pj's right, the rings I got were probably crap and too loose. I do understand the different expansion rates of the cylinder, piston and rings...

    I looked at total seal's design, it's really genius, the article they wrote up on the dyno seems the proof is in the pudding, I'll have to see if they have rings to fit the 350

  11. #10
    Senior Member Kurlon's Avatar
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    I've heard some people praise Total Seal gapless rings, and others pan them. One of these days I'll get a set for my mini...

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