Oval Shaped Valves

[Hans Hintermaier]

Hi all,
I own some books of "Apfelbeck", his philosophy was the "radial 
diametral" 4 valve head. His construction goes back to the '30th when 
he built up his first head for 500ccm singles. The last engines I know 
were prototypes for KTM and Rotax around '92. Between he made F2 
4cyl. 2lit., BMW sidecar racing- and other engines.
He also experimented with more than 4 valves, but his flowbench 
results for his radial-diametral head were much better than for any 
other concept. 
If anybody of you wants to construct a new head, :-) I can give you the
book-titles or ISBN, or some GIF's of his latest KTM-head. They 
rebuilt an LC4 engine with it, it makes more than 90HP out of 500 ccm...
There are also lots of easy theoretical and practical tips for every
motor-screwer included. Sorry- only in german language, I think.
Hans
hiha@ brain.nefo.med.uni-muenchen.de
Munich / Germany