Hyabusa Engine Swap

Any topics pertaining to engine transplants (non-BMC powerplants). If you've dropped a big-block in your bugeye, this is the forum for you.

Hyabusa Engine Swap

Postby FcHc80 » Tue Apr 04, 2006 11:27 pm

Does anyone know of a motorcycle swap? I thought that it made sense 175hp and less weight. I've seen midgit race cars with these motors, but haven't found any info on swaps. Any thoughts?
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Postby trevor » Wed Apr 05, 2006 8:21 am

You'd have to rev the nuts off of it to get enough power to move the car. Motorcycle engines do not have alot of low rpm torque. Then you will also need to have a gearbox for reverse. It is doable, but I do not think it would be to pleasant for the average drive. It would be interesting though.
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Postby Charlie Tolman » Wed Apr 05, 2006 9:27 am

Many of these motorcycle engines make their power in the 10,000 to 12,000 rpm range.

Even a differential gear ratio of 5.375 : 1 would not be numerically high enough for a practical appl;ication.

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Postby FcHc80 » Wed Apr 05, 2006 2:25 pm

While you'd still have to rev it, the hayabusa that I was thinking about makes 100lb ft@3000rpm (upto 128@7500) at the wheel. Its HP passes 100 around 6000rpm (upto 150hp@9500rpm). So you might not use the full extent of its power a lot, It seems like it might be streetable. At the very least, it'd be a intresting race car.
P.S. Turbo kits take them over 250hp.
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Postby admin » Wed Apr 05, 2006 8:16 pm

Guy locally has a 'Busa in a Lotus 7 clone. Went like greased snot...I've often thought about such a swap...bet if you sorted it out that such a kit would be a good seller!
:)
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Postby Charlie Tolman » Thu Apr 06, 2006 1:38 am

There is an inconsistency in the above torque and horsepower numbers.

A. 100 ft-lbs of torque at 3000 rpm is 57 horsepower.
C. 87 ft-lbs of torque at 6000 rpm is 100 horsepower.
B. 128 ft-lbs of torque at 7500 rpm is 183 horsepower.
D. 83 ft-lbs of torque at 9500 rpm is 150 horsepower.

Number sets A and B have a calculated horsepower value.
Number sets C and D have a calculated torque value.

The torque curve jumps around as the rpm value increases. While the horsepower curve probably has the correct shape, are the numbers the result of correct torque values ??

Perhaps a differential gear ratio of 5.375:1 might work after all.

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Postby pirate » Thu Apr 19, 2007 7:08 pm

they change the timing on the first 4 gears i belive, cause the bike has a hard time keeping the rear wheel from spinning but you can trick it into thinking its always in 4 so you will always have max hp
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Postby MGDave » Fri Jan 25, 2008 6:21 pm

A guy with a Westfield 7 with factory Hayabusa showed up at one of our autocrosses once. I have never seen an engine stalled so often attempting to transition from stopped to moving. No flywheel combined with inadequate torque at the rpm at which most of us expect to engage the clutch do not combine well. It was easy to see why he trailered it to the event. Once in motion, it ran well, but it would never do as a daily driver IMHO. Our club hot-shoe managed to talk the owner into letting him drive it, and it was the only time I have seen him embarrassed ;)
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