5hp and 47mph

foureasy · #1 11-11-2009, 11:02 PM

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.

MaxPower · #2 11-11-2009, 11:37 PM

That thing is going to kick a$$ at the next death race. Lookout fairracing31

Venice Motor Bikes · #3 11-12-2009, 12:29 AM

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!!

bairdco · #4 11-12-2009, 12:49 AM

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...

flybytaco · #5 11-12-2009, 01:29 AM

hmmm 47 on the dyno? if so dont forget about weight and wind resistance

flybytaco · #6 11-12-2009, 01:30 AM

lol didnt even see what u wrote bairco till after i did

foureasy · #7 11-12-2009, 09:45 AM

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

bairdco · #8 11-12-2009, 12:35 PM

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..."

foureasy · #9 11-12-2009, 01:23 PM

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.

Venice Motor Bikes · #10 11-12-2009, 02:34 PM

Quote:

Originally Posted by foureasy

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!!)