Information on Jim Feuling's Exhaust Cam Design

[4SFEDFOUR]

I posted a thread on this but cannot seem to find it. Mods please delete if duplicate.

I am looking for information on a cam shaft design credited to Jim Feuling. The design incorporates an extra valve opening event prior to the main valve opening to promote cylinder evacuation. I understand it did little to aid in its inteded purpose but it did make the 4 cylinder Quad 4 motor sound like an 8 cyclinder.

Anyone have more information on this?

 

[evelrod]

I'm still into bikes, mostly vintage. One of the forums I use is Kneeslider and this was my first hit.

http://thekneeslider.com/archives/2005/03/31/jim-feuling/

Rod

 

[4SFEDFOUR]

Thanks Evelrod... I have seen this info before... not able to find anything on the cam though. I hear there was a Road&Track article on it.

 

[izzmus]

Not Jim Feuling's work, but here's a similar concept applied to the intake valves so that pistons with no intake reliefs can be used:

http://www.theoldone.com/articles/The_Soft_Head_1999/