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June 30th, 2007
June 30th, 2007
June 30th, 2007
June 30th, 2007
June 30th, 2007

[User Picture]04:53 pm - A thought I had...
...regarding a possible engine design using current-day techniques in a different configuration.

Namely... take a pushrod configuration engine set up as an interference engine, gear-driven directly off the crankshaft or possibly chain-driven. Then put dual-overhead-cams on it, that are belt-driven or chain-driven as desired. Or... if you go gear-driven for the pushrods, that could raise things far enough you can use that as a driving gear for the camshafts as well.

Now, here comes the fun trick. It's a variation of the Desmodromic valvetrain idea. Use the pushrods to close the valves. And use the camshafts to open them back up, and push the pushrods back down into place if needed.

Suddenly that 'leftover gear' in a gear-driven camshaft system has a use. Closing the valves, as a safety measure to allow for high RPMs safely. And that 'third camshaft' would be far enough displaced from the DOHC camshafts that it shouldn't be hard to angle all the parts around each other.

It's just a thought I had... but I've no way at all to capitalize on it so I figured I'd punt it up here as a possible way to combine variable-valve-timing with Desmodromic valve-systems in a way that doesn't make the head suddenly larger and heavier AND more complex to lay out than the entire lower end of the engine. :-)0 commentsLeave a comment
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