EXTREME high speed track
08-25-2011 | 05:04 PM
#16
Tech Fanatic
Joined: Dec 2010
Posts: 805
Picco sold a rally engine when they had the Evo2, I believe the main difference was an off-road coolinghead, but there might have been some alterations to the timings as well. But Tecnopower, RB, Rossi, Novarossi, OPS (sure i have missed some) have them.
The biggest disadvantage is the lack of torque down low, but extra care when assembling the drivetrain will cure much of that (=reduce both mass and friction).
I´m not saying my route has been easy to take, pipe is critical, no commercial race fuel have worked well and the carb have needed work on throttle, needle and venturi to work at all (just to name some of all the things done).
Tune by smoke or temp won´t work well (95-100c and it´s to lean, 85-90c with almost no smoke at peak rpm and it runs perfect).
But on tarmac it will hang with 2-shifted GT-cars...
Sorry if it became slightly of topic, this was about a racetrack, not my somewhat unusual mod/route.
Lille-bror:
Give me a shout if you´re in need of a "store-bror" and I will take you up on that cold beer!
The biggest disadvantage is the lack of torque down low, but extra care when assembling the drivetrain will cure much of that (=reduce both mass and friction).
I´m not saying my route has been easy to take, pipe is critical, no commercial race fuel have worked well and the carb have needed work on throttle, needle and venturi to work at all (just to name some of all the things done).
Tune by smoke or temp won´t work well (95-100c and it´s to lean, 85-90c with almost no smoke at peak rpm and it runs perfect).
But on tarmac it will hang with 2-shifted GT-cars...
Sorry if it became slightly of topic, this was about a racetrack, not my somewhat unusual mod/route.
Lille-bror:
Give me a shout if you´re in need of a "store-bror" and I will take you up on that cold beer!
08-25-2011 | 06:36 PM
#17
Tech Regular
Joined: Jun 2010
Posts: 434
From: melb, australia
so on a track like that with a top end rally/on-rd engine where band is very high , you would have to be EXTRA nice and smooth around the track and keep the revs up close to the sweet spot .. yes? tryin to keep it flowing and not bog down to much .
08-25-2011 | 09:24 PM
#18
Tech Fanatic
Joined: Dec 2010
Posts: 805
The thing is that the power band is very smooth, so it´s quite easy to drive and it has nice strong pull if you´re smooth on the trigger. But if I punch it traction is never enough, it will leave the line with wheelspin with soft on-road tires on tarmac. Smooth flowing tracks when the car is never stopped to a halt it´s great, but for short run ups to jumps there are better engine configurations out there that will snap with better control (less over-throttling).
I haven't had the pleasure to try a B6 or X7, but after reading what people say about them my guess is that they are up for the job. With less hassle... 
I haven't had the pleasure to try a B6 or X7, but after reading what people say about them my guess is that they are up for the job.
With less hassle...
08-28-2011 | 04:00 AM
#20
Tech Master
Joined: Jul 2004
Posts: 1,842
From: Norway
you would like this one: http://www.novarossi.it/eng/products...?name=KANGAROO .21RALLY&display=public
and then the rmv clutch with alu shoes and 1.1mm spings. if you run a Mugen or similar gearing ca, use a 15t clutchbell
and then the rmv clutch with alu shoes and 1.1mm spings. if you run a Mugen or similar gearing ca, use a 15t clutchbell
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
