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2nd December 2004
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Chief Harley Engineer
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Join Date: Nov 2004
Location: Fort Sill, Oklahoma
Posts: 555 Sportster/Buell Model: 883r /1200 upgrade Sportster/Buell Year: 02
Reputation: 24
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Is this not a sweet bike?
Is this not a sweet bike????
And I have a question, if 2-1 pipes make more HP why do racers and Track runners have 2-2? Just wondering
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2nd December 2004
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Biker
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Join Date: Nov 2004
Posts: 99
Reputation: 0
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Disclaimer... I'm definately not an expert on this topic...
I think that the 2:1 pipes help in a particular region of the torque/HP curves, down around the low end. But it doesn't matter so much either way up at higher RPMs. So if your racing at high RPMs all the time 2:1 doesn't help a whole lot. Thats why the call the straight open pipes "Drag Pipes" cause they are only really good if you are drag racing, not so good when you are puttin around town.
Gary
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2nd December 2004
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Senior Master Custom Bike Builder
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Join Date: Nov 2004
Location: Philippines
Posts: 5,259
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Looks alot like this bike from Japan: (of course, this is a much newer bike)
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2nd December 2004
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Chief Harley Engineer
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Join Date: Nov 2004
Location: Fort Sill, Oklahoma
Posts: 555 Sportster/Buell Model: 883r /1200 upgrade Sportster/Buell Year: 02
Reputation: 24
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Understand that. I just dont see a FOT throughout the entire race. Unless redlining into power slides around turns. I can see that NVM. Got it. I just think this is a kick ass bike.
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2nd December 2004
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Chief Harley Engineer
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Join Date: Nov 2004
Location: Whitehall, WI
Posts: 531 Sportster/Buell Model: Sportster Hugger Sportster/Buell Year: 2001
Reputation: 10
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I agree, that XR is a very sweet bike, very clean. Man, what I wouldn't do to have one of those...
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2nd December 2004
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Flat Track Racer
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Join Date: Nov 2004
Posts: 226
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Quote:
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Originally Posted by SkippyRay
And I have a question, if 2-1 pipes make more HP why do racers and Track runners have 2-2? Just wondering
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Ask George Crim that question. |
2nd December 2004
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Senior Master Custom Bike Builder
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Join Date: Nov 2004
Location: beaver dam wi. 10,000dam beavers can't be wrong
Posts: 8,977 Sportster/Buell Model: xlh Sportster/Buell Year: 95 Other Motorcycle Model: wla flathead45 Other Motorcycle Year: 1945
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skippy , those bikes were made in the early mid 70's and at that time not a lot was known about exaust tuning (compared to now) so pipes were pipes
almost bought one in the mid 80's for 1000 bucks (wish I would have) stone stock and it was a 1000cc not a 750 with thunderbolt heads killer performance back then . wish I could find a set now
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I still believe that overhead valves are a passing fad
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2nd December 2004
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Chief Harley Engineer
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Join Date: Nov 2004
Location: Fort Sill, Oklahoma
Posts: 555 Sportster/Buell Model: 883r /1200 upgrade Sportster/Buell Year: 02
Reputation: 24
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Would be nice to own thats for sure
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2nd December 2004
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Chief Master Mechanic
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Join Date: Nov 2004
Location: Kent, England
Posts: 473 Sportster/Buell Model: XL1200R Roadster Sportster/Buell Year: 2004 Other Motorcycle Model: Yamaha XJR1300 Other Motorcycle Year: 2004
Reputation: 22
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Have you seen the 05 accessory catalogue? They now list a new crated XR750 engine (around £10,000) according to my dealer.
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1200RSC - Roadster Sport Custom (Roadster Base, Sport suspension, SE Stage 2 engine and Custom bodywork)
"This man is depriving a village somewhere of an idiot"!
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2nd December 2004
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Senior Master Custom Bike Builder
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Join Date: Nov 2004
Location: the tropical north of Australia
Posts: 6,542 Sportster/Buell Model: 11 second 1200S Sportster/Buell Year: '98 Other Motorcycle Model: about a dozen others.....
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Different pipes have differing power characteristics the 2-2 's like on the flat trackers tend to give a wide flat torque curve...good for playin the throttle on a low traction surface...gives a predictable power output.
A 2-1 tends to dip around 2700 and come good 3500 and up
2-2 with cross-over usually will be good around the 2500 mark
Straight drag pipes don't work untill over 4500.
Most (read all I've seen) sporty racers over here use at locally made 2-1 of which I'm runnin on my sporty
Buells are a 2-1 ..................
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Havin a few beers in the shed with my mates.
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