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  #21 (permalink)  
Old 05-07-2007
Scot03Bonnie's Avatar
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250 Grand Prix
 
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Location: Atlanta north 'burbs
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<<813 South Bay cams>>
It wasn't so much a decision about the cams as it was a decision about the entire combination of parts.
I actually had quite a discussion with Matt Capri about this engine build. I was out there on business so I stopped in and spent a couple of hours getting to know him, looking at and listening to his street tracker, looking at the parts and some engines in process of assembly, and talking about the development work he's been doing. He showed me the progression of tests they'd been doing as they introduced the various changes and it became obvious that this combination of bore, stroke, compression ratio, valve size, port flow, and cam profile was the one out of everything they had done that would produce the highest, flattest torque curve, and would not require spinning the engine up around 9K to get big power. He also talked me out of the 1150 barrel kit even though I was intent on building the biggest engine I could get. Ultimately, it isn't worth the small incremental ponies you get vs. the expense and it saves machining the cases. The 813 cams are very streetable, there's no issue with off-idle throttle response or idle quality and the carbs are so infinitely tuneable that you can set them up to get exactly what you want. Matt specifies valve clearances that are .002" tighter than the Triumph specs because these cams have a more consistently machined lobe surface. But again it's the combination, not any one thing on it's own, and to me it would have been a waste of time to run cams other than what had proven to work best.
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Old 05-08-2007
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To be honest mate I am a bit peeved off, cos that is virtually the same paint job I was planning to do my on tank! I absolutely adore that shade of red, but now I might look like a copycat if I persue it grrr :-D

It really is proof of how these bikes can be made to look like the motorcycling equivilent of the supermarine spitfire.

It is just such a bloody sexy bike!
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  #23 (permalink)  
Old 05-08-2007
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i really want to see some dyno numbers

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  #24 (permalink)  
Old 05-08-2007
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250 Grand Prix
 
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Location: Atlanta north 'burbs
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Beastie-
Sorry, mate! but, the '67 is a fave of many, so don't worry 'bout the copycat thing. It'll be done many times. "that shade of red" is actually many coats of candy purple urethane over gold base, which gives it a reddish glow when the sun hits it. In the shade it actually looks more purple.
Glad you like it!
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Old 05-08-2007
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ftl-
RE: dyno numbers- I'll post those when I start my tuning runs. Suffice to say for the moment, this thing is a beast.
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Old 05-08-2007
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http://www.mecatwin.com/fr/motos/triumph/tt/g8.htm

I did have my eye on that perticular style as well, although I cant seem to get hold of the guys at mecatwin to find out exactly what shade of red that is.

One thing though on your tank, that flange doesnt seem as visible, is it just the camera angles or did you do something to make it not stand out as much?
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Old 05-08-2007
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250 Grand Prix
 
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That is a nice color and I like the "wing" too. It looks pretty close to what I have, and you can tell it was a cloudy day when they took that shot.

The flange seam on the tank did not recieve any special treatment, we just made sure the white covered the outer part that you can see, and inside it's purple. I think this paint scheme just sort of works to take the eye away from that or makes it disappear.
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