Rumely Oil Pull engine

I don't think mine are anything special about the £10mark sounds right, 3 stone at that size.

For 30mm I would say you could go with a BS120, 3.12mm wide groove and 2.5mm deep

Thanks Jason, I'll get one ordered.

I have a query regarding the fitting of the ball bearings on my crankshaft. I was going to fit the outers in the housings using loctite bearing retainer but i want to ensure that the inners don't creep on the crankshaft. Or am I being a bit pernickety? I would have liked them a bit tighter than the fit I achieved but perfection is rarely attained in model engineering so I wondered if there is anything I could put on the shaft that would prevent rotation but still allow me to dismantle it easily. The ball bearings are doubled each side and are 17x 35x10.

Thinking about "Pull Rods" for the valves, how about a lever follower, under the cam. with a refined form of clevis on the pull rod?

Was that how the real engine did it?

Otherwise, the spring arrangement shown provides the opening force for the valve by keeping the follower in contact with the cam. and then if the linkage is secured to the valve, as a valve spring to hold it on the seat..

Or was the cam internal, with the pull rod external to the follower?

Howard

Hi Howard, yes the original cams were internal. What I have decided on is as you suggest, a lever follower under the cam with a bell crank action to pull the valve rod.