by frankdamp » Thu Dec 11, 2008 11:11 am
Be very wary of the P-11. It was a scary piece of work. When I was at Norton-Villiers in Wolverhampton, we found out about a lawsuit in California against N-V for injuries in a P-11 off-road accident. Nobody at N-V knew what a P-11 was!
We tracked it down to the US importer (Berliner Motors, I think) who had stuffed an Atlas engine into a Matchless 500 Scrambler frame and badged it as a Norton. We got one to test. It had the candy-apple red tank and black frame - quite a handsome beast.
It had a very unsettling dynamic characteristic. I did the initial break-in miles, limiting myself to less than 75 mph. It felt slightly uncomforable in the yaw axis and would start to weave as speed built up, getting to about about 12" from side to side at 60 mph, and you couldn't do anything to stop it. As speed went up, the amplitude of the weaving got bigger, until at 75 it was almost a full freeway lane wide from side to side.
The other test rider, who did the later testing, was braver than me and he found that at about 85, it straightened out. We tried all kinds of changes trying to fix it, but wthout decent test instrumentation we couldn't really sort out the cause.
That bike and my old 650SS commuting bike were still in the experimental shop at Marston Road when it closed down. I don't think they went to Andover. Have no idea what happened to them.
Frank Damp
ex-Norton Villiers - Marston Road
Develpment & Competition Department
1967-68