Supercharged Cannondale
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Haven't tested it on the street or dirt yet. Still building/testing/tuning. We weren't sure it would survive the dyno but it has done really well. This is primarily a sand bike as are most of our rides. The belt will be getting a cover for the flywheel area that allows for drainage of sand/debris/water.
Charts? Yes, we have had it on the dyno and I can post the chart but I'll have to get it back from Jeremi. The dyno was reading low for everything we tested on it due to recent software changes but for comparison purposes: this bike made 40rwhp normally aspirated. We hooked the supercharger up and got it to 56rwhp before we ran out of time. So, a gain of 16rwhp with minimal tuning. It makes 6psi of boost at about 2600rpm. We're going to feed it some methanol and crank up the wastegate for some higher boost levels. Back to the dyno...
-Chris
Charts? Yes, we have had it on the dyno and I can post the chart but I'll have to get it back from Jeremi. The dyno was reading low for everything we tested on it due to recent software changes but for comparison purposes: this bike made 40rwhp normally aspirated. We hooked the supercharger up and got it to 56rwhp before we ran out of time. So, a gain of 16rwhp with minimal tuning. It makes 6psi of boost at about 2600rpm. We're going to feed it some methanol and crank up the wastegate for some higher boost levels. Back to the dyno...
-Chris
QUOTE (ScramblerXLE @ Apr 30 2010, 09:33 AM) <{POST_SNAPBACK}>
Is there a reason chain/sprockets wouldn't work? If it would be too much shock I would imagine a slipper clutch could take care of that. Just thinking out loud...
One thing would be the weight. That's a lot of weight swinging off the end of a crankshaft. Another would be the shock. Due to the shock, the chain would have to be EXTREMELY tight, which would be very hard on the chain. Blowers do have surges too, which would be detrimental to a chain setup. One more thing would be the linear speed of the chain. Its significantly higher than engine RPM in most setups.
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I have been thinking about it, and about the only way to do it would probably be to use a high performance cam-chain like setup and even that would likely need to be baithed in oil to last, so a chain setup probably wouldn't work. Therefor: if I ever boost something it would likely have to be turbo'd... VERY cool project though!
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QUOTE (jinx44 @ Apr 30 2010, 12:38 PM) <{POST_SNAPBACK}>
One thing would be the weight. That's a lot of weight swinging off the end of a crankshaft. Another would be the shock. Due to the shock, the chain would have to be EXTREMELY tight, which would be very hard on the chain. Blowers do have surges too, which would be detrimental to a chain setup. One more thing would be the linear speed of the chain. Its significantly higher than engine RPM in most setups.
A belt comming off or apart at 10500 rpm is going to get you attention (to put it mildly). A chain????????? not by my foot, shin and knee. and if your laying down over the tank the rest of your right side isn't far away.
I haven't weighed it, but the blower feels like it weighs less than a size 9 battery. If/when I ever take it out, I'll put it on a scale.
We considered using a chain and found that the belt was perfectly adequate. So far we haven't experienced any slippage and it fits very tightly. We'll see what happens as we increase boost levels.
We considered using a chain and found that the belt was perfectly adequate. So far we haven't experienced any slippage and it fits very tightly. We'll see what happens as we increase boost levels.
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