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Hi from AUS.
I am restoring a 1921, 61" Harley Davidson and sidecar. Sadly there's no original finish left, and a lot of repairs happening, so I have to refinish. I was hoping that sone of you old Harley fans might be able to confirm the amount of interference fit required for the crank pin bearing race rings when pressing them into the con rod eyes. I thought about 0.0025" might be about right, but I would like to get yor ideas on the amount of press fit interference. Also, has anybody used the forged dome topped pistons supplied by Competition Distributing for J and JD models? I had never thought of using a domed piston in a pocket valve cylinder. All the J pistons I have seen are flat top. I know that with modern higher octane fuels, a little higher compression ratio probably shouldn't be a major problem.
Any comments or thoughts on these subjects?
Mike21F
I am restoring a 1921, 61" Harley Davidson and sidecar. Sadly there's no original finish left, and a lot of repairs happening, so I have to refinish. I was hoping that sone of you old Harley fans might be able to confirm the amount of interference fit required for the crank pin bearing race rings when pressing them into the con rod eyes. I thought about 0.0025" might be about right, but I would like to get yor ideas on the amount of press fit interference. Also, has anybody used the forged dome topped pistons supplied by Competition Distributing for J and JD models? I had never thought of using a domed piston in a pocket valve cylinder. All the J pistons I have seen are flat top. I know that with modern higher octane fuels, a little higher compression ratio probably shouldn't be a major problem.
Any comments or thoughts on these subjects?
Mike21F