Re: how much compression can these things take?
As far as i understand, the main fuction of the slant head is to allow the engine to fit into the more space restricted designes of modern bicycle frames.
A side affect of this design is to have a cylinder head with reduced volume and thereby increasing the compression ratio over the conventional cylinder head. Some people report gaining power when switching from the straight plug to the angled plug design.
As a purist, i prefer the straight plug cylinder head with it's vertical and centrally located sparkplug design.
I've experimented with the Rock Solid Billet Cylinder Head (of which has very high compression) yet wasn't able to get it to work. In the end reverting back to the standard head.
Having said that, other people have reported tremendous success with the billet cylinder head.
Last edited by Fabian; 06-02-2010 at 11:20 AM.