Valve To Piston Clearance...
#11
I kinda embarrassed myself with the pics that I posted of my initial clearance testing.. So this morning I'm going to disassemble the cylinders and pistons and clean them up and reassemble.. Wish I had a Trock but then you can't get your valve to valve pocket radius clearance, can you.. So I'll repost later today hopefully.. Thanks for all the help guys, this is the first time I've done this.. Usually when ever I built a motor, I just relied on machine shops advice.. And this time I was told I'd better check it..
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Ohio HD (04-20-2024)
#12
#13
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98hotrodfatboy (04-20-2024)
#14
Another question, I remove O-rings from the cylinder bases and the Cometic are like a quad seal o-ring. Have you ever used them and pros and cons would be appreciated.. I do see that the cases are cleared in the seal areas but was wondering if the quad style seals might be too tall and not squish properly.. I never had any issues with the regular o-ring but these are what came in the Cometic kit.. Also should I put a slight coat of oil on the o-ring on installation.. Thanks..
Last edited by 98hotrodfatboy; 04-20-2024 at 09:07 AM.
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98hotrodfatboy (04-20-2024)
#16
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Ohio HD (04-20-2024)
#17
I've not used them. I typically get -155 viton O rings from Mcmaster.
One thing you can try if worried is to slide the cylinder in place, use 2 holded down spacers and tighten the cylinder to the case, It should feel springy then stop when the cylinder touches the case. If it feels smooshy, the seal is holding the cylinder off the case.. Not good..
You could also measure the cross section area of the ring and compare to the measured cross section of the groove. You would like to see the ring have a slightly smaller cross sectional area than the area of the groove. Maybe 5 to 10 percent..
One thing you can try if worried is to slide the cylinder in place, use 2 holded down spacers and tighten the cylinder to the case, It should feel springy then stop when the cylinder touches the case. If it feels smooshy, the seal is holding the cylinder off the case.. Not good..
You could also measure the cross section area of the ring and compare to the measured cross section of the groove. You would like to see the ring have a slightly smaller cross sectional area than the area of the groove. Maybe 5 to 10 percent..
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harpwrench (04-20-2024)
#20
Just a note I measured the o-ring for the bases being used for about 4,000 mi it came in at .095".. I should be fine .
Last edited by 98hotrodfatboy; 04-20-2024 at 11:19 AM.