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O_gur said:for the air head fellows out there.
Exactly how rare is a dual overhead cam air head?
You had it correct before the "whoaa." That's how it is done. I have a photo or two of an overhead cam BMW that utilized desmodromic valve gear.pmdave said:Wow, you sent my brain spinning for a moment there. I started imagining what would be involved to drive overhead cams from the crank of the typical airhead--say an R100... The only logical approach would be to install a gear drive from a new gear on the camshaft, driven via a shaft to the cylinder head, to a.... whoaaa. There's no way to convert an airhead to overhead cams, let alone dual overhead cams.
Rennesport motors are NOT desmodromic. I have a photo or two of a bike with a motor that a guy built by adding some Ducati bevel-head parts. I'll be able to share when I get back to work next week.donkey doctor said:Wasn't that overhead cam operated by a tower shaft with bevel gears at each end, similar to the way Ducati do it. I didn't realize that they were desmdronic...
woodnsteel said:Ikchris writes;
"PS: Although Oilheads have cams in their heads, the valves are not below the cam (between the cam and the piston), so technically these aren't overhead cam engines, either."
In the vintage american motorcycle world, OHV motors are referred to as "push-rod" motors as opposed to flatheads. Oilheads have chain driven cams in the heads as opposed to in the block, and no push-rods. The cams rotate above, or "over the top" of the pistons. If the oilhead motor is not a flathead, not a push-rod motor, then I submit that it is right and proper to call it an OHC motor.......with all due respect.