Gallery, Projects and General > Project Logs
Webster IC Engine build log.
Bogstandard:
Does this C-o-C explain it any better?
dbvandy:
I skipped all of that on my Webster as it is not needed to have the tiny socket head screws to hold the pin in. Just make it out of brass (worked fine for me) or stainless with brass ends (more work than I wanted to do.) The original one I made was stainless and it started to "polish" the cylinder walls, so I made one out of brass.
Doug
raynerd:
John, yes, thanks a lot. If only all the parts were written in c-o-c, it would make much more sense to me!! :ddb:
Thanks again for your time and effort in posting.
dbvandy - yes, I did wonder if it was needed. If you are not using the grub screws how is yours staying in position - friction fit?
Chris
raynerd:
...just another quick question.
I`ve ordered the 11/16 ID by 3/32 cross section O-rings. This obviously gives me the 7/8" OD I need. My question is, should it be slightly compressed in the groove or should the groove me 3/32 by 3/32" so that the o-ring is perfectly sitting with an OD of 7/8" ?
I`m guessing it should be a little bit compressed. Can anyone shed any light over the groove dimensions?
dbvandy:
--- Quote from: craynerd on March 17, 2011, 09:32:48 AM ---
dbvandy - yes, I did wonder if it was needed. If you are not using the grub screws how is yours staying in position - friction fit?
--- End quote ---
My pin floats. it is about .020 smaller than the cylinder so it does ride along the cylinder wall, but it is brass, so it does not matter. I did the exact same setup with the otto and it works great.
With the Webster I followed the spec for Viton o-rings and oversized the groove... the o-ring slides up and down the piston about .040. This just did not look right to me, so on the Otto, I cut the groove just a little larger than the thickness of the o-ring so that when it compresses, it fills the hole.
This is the sheet I followed, but I don't think it needs to be as wide as shown:
Doug
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