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5hp and 47mph


Discussion at Motorized Bicycle Engine Kit Forum in the High Performance Bicycle Engine Tips forum. i finally put my little crankenstein experiment on the dyno. i couldn't figure out an easy way to strap ...
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Old 11-11-2009, 11:02 PM
foureasy's Avatar
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Default 5hp and 47mph

i finally put my little crankenstein experiment on the dyno. i couldn't figure out an easy way to strap it on, so i had to start the bike in the street and ride up on it. getting the inertia wheel spinning smoked my clutch after a few runs and i had to limp it back to the shop. anyways, i got one solid pull and here it is. a little over 5hp at the wheel at 6800rpm. top speed of 47 which works out to almost 8800rpm, i probably could have wrung out 48 but i wasn't being too greedy. definitely not 50mph though. i think i may take a couple inches out of the pipe with another tiny dose of port work for the next expiriment.






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Old 11-11-2009, 11:37 PM
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Default Re: 5hp and 47mph

That thing is going to kick a$$ at the next death race. Lookout fairracing31
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Old 11-12-2009, 12:29 AM
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Default Re: 5hp and 47mph

I don't think there's any doubt that this one's gonna need better brakes!!
You're just a bump away from hitting that magical 50MPH mark that those other foolios think they can do!!
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Last edited by Venice Motor Bikes : 11-12-2009 at 12:36 AM.
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Old 11-12-2009, 12:49 AM
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Default Re: 5hp and 47mph

it'd be cool if you could do a dyno comparison with a stock motor. it'd be interesting to see what kinda power output they have, and the difference between your "experiment."

one factor in your speed, however, is there's no wind resistance on a dyno. in real-world riding conditions, it'll be a little slower. (not trying to talk s**t, just pointing that out.)

it is awesome the amount of effort and imagination you're putting into this. i wish i had the tools to do the same...
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Old 11-12-2009, 01:29 AM
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Default Re: 5hp and 47mph

hmmm 47 on the dyno? if so dont forget about weight and wind resistance
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Old 11-12-2009, 01:30 AM
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Default Re: 5hp and 47mph

lol didnt even see what u wrote bairco till after i did
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Old 11-12-2009, 09:45 AM
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Default Re: 5hp and 47mph

you're right, i quadrupled the hp of your motor, but i cant comprehend wind resistance.

i would like to do a stock comparison, but i just cant seem to put a stock motor on a bike.

better brakes? i'm more worried about my frame falling apart, which it has tried to do a couple times already
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Old 11-12-2009, 12:35 PM
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Default Re: 5hp and 47mph

hey, i wasn't knockin' ya, i was just sayin'...

you know how passionate everyone gets about "proof." we're just never satisfied

i could ride alongside you in a car, and still say, "yeah, well i dunno if my speedometer's calibrated..."
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Old 11-12-2009, 01:23 PM
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Default Re: 5hp and 47mph

i know, i know. my main focus was on the hp number, and the progression of the power curve, not so much the speed. besides, the case is about the only stock thing left on the motor anyway.
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Old 11-12-2009, 02:34 PM
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Default Re: 5hp and 47mph

Quote:
Originally Posted by foureasy View Post
better brakes? i'm more worried about my frame falling apart, which it has tried to do a couple times already

Yeah, I noticed that too!! (a $1,000. engine in a $20. bike!!)
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