Robert Bays
Basic
- Joined
- Dec 14, 2018
- Messages
- 12
I built a 906cc 8 valve Triumph race motor, it was awesome.
My current Cdo is pretty hopped up and is quick on the road, it’s got 65rwhp. The 906 8 valve produced 84rwhp on the same dyno.
It would be interesting to see what the Big D kit consists of...
Commando.What's a "Cdo?
Oh.....Duh.....How do you get 908 cc's from a Triumph? Do you have dyno readouts? I'm interested in that sort of thing..Tim Joyce,a past leading AHRMA Triumph rider was getting about 70-75 RWHP from two valve Triumph 750's with extensively modified headsCommando.
Have you thought about flat slides? Mikuni TM's are inexpensive and from my experience, easy to tune with great throttle response.I also got just shy of 75rwhp from a 2 valve Triumph, but it was 840cc and had squished heads and etc.
The 906cc wasn’t really a Triumph per se, it was a Nourish in Triumph unIt cases, albeit extensively welded and strengthened, 80.5mm bore and 89mm stroke, 180 degree crank, Dresda cam timing (based on Z cams but with more duration), 38mm carbs and ports, 11.5:1 CR, blah, blah. A very quick bike.
Actually, IIRC, although it did produce 84bhp on the dyno, that’s not how I raced it. For some reason that I don’t understand, with 1000 series mk1 carbs it produced a much fatter torque and power curve than it did with smoothbores. Whilst the 1000 series carbs produced less peak power, the overall power and torque characteristic were better. I think in this set up it produced 79bhp and that’s how I raced it.