While we’re on the Scrambles theme, what are the differences between 42/46 and 46/46 ?
So, Clubman vs. Scrambles. Again, there's the issue of a silencer, such as it is on a Clubman, and a straight pipe on the Scrambles.
Surprisingly (to those who haven't looked at the curves), there is relatively little difference. The difference in maximum hp would be important on a track, but perhaps less so for a bike ridden on the road.
Clubman: 28.5 hp @ 5000 rpm; 36.5 hp @6000 rpm; 39 [email protected]
6500 rpm; 40 hp @7000 rpm
Catalina: 32 hp @5000 rpm; 37.5 @6000 rpm; 39.5hp @ 6500rpm
Note that there was a steady increase in the highest hp over the period of development, and there is variation even with the same cams, so I'm quoting results from the latest curves I have. Basically, with Scrambles cams you give up a little at redline, but gain at lower rpm.
It's a personal decision, but I'm not planning on riding at the IoM so I never intend on any my engines seeing anything close to redline. Given that, for me, Scrambles cams seem the way to go. Interestingly, the only dyno curve I have for a Competition model shows 41.7 hp. @ 7000 rpm. That model was built by the factory with Scrambles cams (the curve is actually for the bike I own, and when I rebuilt the engine I found Scrambles cams in it)..