Originally Posted by
DP-buggyboy
The goal of this design is to end up with a 4 stroke engine that bolts directly into any place a current .21 two-stroke fits, and is able to use the same (or at least very similar) gearing and clutch hardware. The reality may be slightly different than that, but that's the point - to find out if it's possible. Nobody has ever attempted this before (that I know of). It will need to be compact, VERY high-revving and if I can manage, I would like it to not require a cooling fan... Pie-in-the-sky stuff for sure, but the project should be at least lots of fun.
You know the term "floating valves" ?
With surch high rpm's a very strong return spring is needed to close the valves folowing the camshaft. Having such a pressure and so resistance on the camshaft you will loose power.....
The only thing to solve this is using rotating valves. Once I have seen an engine using 2 rotating tubes above the cylinder, one with an hole to the cylinder to let the fuel through the tube in and one tube with a hole conected to the exhaust.