Uncle Bob's new hot rod

[HobbyMan]

I wonder what kinda revs you could get with 4 electric valves before floating them.

[TomB]

Easy!

When the speed of the crank revs overtakes the speed the electric valves move. The answer then is, make the electric valves quicker. If the electric valve speed can always out pace the crank revs then you will not get valve float.

Another way is to use Desmodromic valve operation which is directly connected to the crank with closing as well as opening the valves, adopted by Ducati.

click Desmodromic

[Pat Kelly]

Just replace the valvetrain completely.
Use a large diameter shaft to replace the cams. In that shaft are passages that allow air/fuel into each cylinder (at the correct time) and exhaust out (at the correct time) as the shafts rotate. This would eliminate valve float as the valves are the ports being opened and closed through the rotating shafts. Limiting factor for RPM would be piston speed.

[Trikerneil]

There is a friction problem to be solved with rotary valves.
THIS makes interesting reading.

[HobbyMan]

Actually there is a commercially available RC engine with similar properties. One buddy of mine had this engine where there was a hole in the piston sleeve and it rotated around the piston inside the case. So, as the exhaust stroke came around, The hole aligned up with the exhaust port in the cylinder, then as the sleeve rotated, the passage would cover up and eventually, It would get around to opening the intake duct. So, the sleeve is rotating while the piston is going up and down. What a weird running engine. It had a LOT of friction trying to turn it over when it was cold. Neat idea even though it seemed hard to tune.

[TomB]

Interesting site Neil

[lisk]

Hi Guys, I was looking at this picture of Bob's bike. Looks cool, lots of work and money! I was wondering about the lower "Air Spoiler" or "Scoop" that's bolted on below the front of the engine. Always wanted something like that on my XS. Anyone know where that may have come from or where I can find it? Thanks guys.

Happy New Year!

[lisk]

Air Scoop

Nice pictures. Anyone know where I can get an air scoop or air "something" like the one mounted below the engine at the front of this bike? I've always wanted one of those on my XS?

Happy New Year!

[50gary]

http://www.airtech-streamlining.com/index.html
Try this one, they have tonnes of bodywork for bike of all types.
I have some of their stuff and quality is good.
Cheers, 50gary

[Pat Kelly]

universal air scoop

[lisk]

Thanks guys!

Thanks for the info guys! Pat I appreciate that info on JC Whitney. I will be ordering one there. Have a great one guys and happy riding....well not in my case as it is semi-winter here!! Take care.