Awesome Track Day Car

Bear said:
I would have thought a megabusa would return more miles than that if looked after. They are 1.3 and technically a touring bike so would expect it to last a bit longer than a normal race bike engine, although I dont know anything about it really.
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Busa engine's phenomenally strong, but car use puts different stresses on them from what they're built for. 'Specially if you blow them, and track them... which of course, you would :)
 
Northwind said:
Busa engine's phenomenally strong, but car use puts different stresses on them from what they're built for. 'Specially if you blow them, and track them... which of course, you would :)
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Car doesnt really add too much stress, as we gear them far lower than you would on a bike...

gearing a 200 mph engine for 130 mph removes a lot of the stress you would think was added..


:D
 
Dr Who said:
gearing a 200 mph engine for 130 mph removes a lot of the stress you would think was added..
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Not higher, but different. Transmission stresses break more Busa engines than anything else, there's a reason that complete heads are so expensive- overrun one hard and you can bend all 8 exhaust valves. Much easier done on a low-geared kit car than a long-legged 200kg bike- dependant on how it's plumbed in of course. I know of a Locost/1400 cc Busa with a Sigma slipper clutch and a holeshot turbo in it, the slipper needs rebuilt after every trackday but the motor will probably last forever. If he stops crashing it anyway :)
 
The_Dark_Side said:
btw very nice spec in the OP.
i just can't like the Vortex "bulges" infront of the windscreen.
i just prefer the classic se7en look.
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The bulges actually add wind deflection but I know what you are saying...

The torsional forces on the crank arent as excessive as one might think due to the primary reduction in the engine...

But it can break gearboxes... obviously if you lift off and bang it down the box to overrev it you are gonna do some damage, thats why mechanical sympathy is important...

:D
 
The_Dark_Side said:
i'm not sure i follow you.
different how?
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Quote: me "Transmission stresses break more Busa engines than anything else, there's a reason that complete heads are so expensive- overrun one hard and you can bend all 8 exhaust valves. Much easier done on a low-geared kit car than a long-legged 200kg bike"
 
Northwind said:
Quote: me "Transmission stresses break more Busa engines than anything else, there's a reason that complete heads are so expensive- overrun one hard and you can bend all 8 exhaust valves. Much easier done on a low-geared kit car than a long-legged 200kg bike"
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and the fact the quote ends with "200kg" indicates that the weight of the vehicle is the deciding factor, namely that the weight of the vehicle will be riding through the gearbox shafts into the engine.

which is pretty much what i initially said.
 
Um... yes? Did you think I was disagreeing with you? :D

Wee aside... Why do people use Blade engines for kit cars, just because they're cheaper? GSXR1100 would be better surely, more torque, stronger bottom end, more tried and tested tuning options...
 
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