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  #11  
Old 11-21-2013, 04:03 AM
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Russ McClay Russ McClay is offline
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Default Re: interesting experiance, trying to blow up a china girl !!

Very interesting experiment, rogergendron1!
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  #12  
Old 11-21-2013, 08:43 AM
BonusParts BonusParts is offline
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Default Re: interesting experiance, trying to blow up a china girl !!

You're wasting time trying to blow it up. I've learned one thing that IS constant with ALL HT style motors: If you baby them they break. If you flog them like a donkey they dont quit. I rode mine full bore for 30 miles missing an exhaust stud, and it was HOTTTT, but no issues. still runs great, does 40+ on the reg.
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  #13  
Old 11-21-2013, 10:49 AM
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MotorBicycleRacing MotorBicycleRacing is offline
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Default Re: interesting experiance, trying to blow up a china girl !!

Quote:
Originally Posted by rogergendron1 View Post
OK SOB !!! to go 40mph with a 44 t sprocket i must have been reving her close to 11,000 rpm!!!

tire size 26in
10 t drive and a 44 t rear = 4.4:1 rear axle ratio
motor ratio is 5:1 reduced i think
and speed was 40 miles an hour i believe ... i was passing cars going 35 !

those numbers give me and engine rpm speed of 11,372 !!!

using this calculator
http://www.crawlpedia.com/rpm_gear_calculator.htm

even if i say i was only doing 35, the same speed fo the cars i quickly passed the rpms would be ......... 9,951 !!!
Quote:
26in tire, 44t rear sprocket, stock front sprocket, 40mph = what rpm ???
Your rpm's at 40.7 mph are 9500

20 tooth bevel gear to 82 tooth clutch gear = 4:1 to 1

Did you measure your tire diameter?
Most cruiser tires are 26.5" diameter which would make your RPM's 9,300

If you were going 35mph your RPM's were 8100

Last edited by MotorBicycleRacing; 11-21-2013 at 10:57 AM.
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  #14  
Old 11-21-2013, 12:55 PM
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rogergendron1 rogergendron1 is offline
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Default Re: interesting experiance, trying to blow up a china girl !!

Quote:
Originally Posted by MotorBicycleRacing View Post
Your rpm's at 40.7 mph are 9500

20 tooth bevel gear to 82 tooth clutch gear = 4:1 to 1

Did you measure your tire diameter?
Most cruiser tires are 26.5" diameter which would make your RPM's 9,300

If you were going 35mph your RPM's were 8100
Thank you ! Can you help me acuratly measure engine rpms ?

Whats the motor gear ratio at the small sprocket?
Whats the gear ratio with a 44t rear ?
Tires are 26 in

So if i was going 40 with 26in tires and a44t sprocket my rpms were 9,300 ? Than i should be able to make a larger diamiter and shorter intake manifold and gain a few more rpms ! I want to break 10,000 and the motor ! Lol and i want it on record via video and speed recorded by app or gps . Mabey i will mount my gps on my bars and video the ride for proof of speed and rpms from math . I want to see if i can psh 11,000 before she blows ! I am real close to 10,00 now so with the larger porting and mabey a larger and shorter intake than the off set one i am running now i can get her there. I have a cns carb 16mm, offset z intake, and major porting and piston mods with a puch 70 high high head . I can run at 9,000 rpms no problem for miles ! I wonder how well reed valve setup would help gain rpms or if its just helping meter fuel and block of the intake at the down stroke .
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here to stay and compleatly insane ! deal with it lol
http://motorbicycling.com/showthread...485#post528485

Last edited by rogergendron1; 11-21-2013 at 01:11 PM.
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  #15  
Old 11-21-2013, 01:14 PM
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Default Re: interesting experiance, trying to blow up a china girl !!

Going to go for a ride tonight to stress her some more willl fo a video of wot high rpms
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http://motorbicycling.com/showthread...485#post528485
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  #16  
Old 11-21-2013, 01:29 PM
Stormsorter Stormsorter is offline
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Default Re: interesting experiance, trying to blow up a china girl !!

Here is a link to the calculator most of us use. I use it so much I've actually forgot the equation to do it myself.

http://jimsitton.net/ratiocalc/

Just click gearratio.exe on that page to download it.

And MotorBicycleRacing already gave you the other info you needed in his last post.
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  #17  
Old 11-21-2013, 01:32 PM
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Default Re: interesting experiance, trying to blow up a china girl !!

use no oil next fill-up problem solved
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  #18  
Old 11-21-2013, 01:50 PM
slayer60973 slayer60973 is offline
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Default Re: interesting experiance, trying to blow up a china girl !!

Quote:
Originally Posted by rogergendron1 View Post
Thank you ! Can you help me acuratly measure engine rpms ?

Whats the motor gear ratio at the small sprocket?
Whats the gear ratio with a 44t rear ?
Tires are 26 in

So if i was going 40 with 26in tires and a44t sprocket my rpms were 9,300 ? Than i should be able to make a larger diamiter and shorter intake manifold and gain a few more rpms ! I want to break 10,000 and the motor ! Lol and i want it on record via video and speed recorded by app or gps . Mabey i will mount my gps on my bars and video the ride for proof of speed and rpms from math . I want to see if i can psh 11,000 before she blows ! I am real close to 10,00 now so with the larger porting and mabey a larger and shorter intake than the off set one i am running now i can get her there. I have a cns carb 16mm, offset z intake, and major porting and piston mods with a puch 70 high high head . I can run at 9,000 rpms no problem for miles ! I wonder how well reed valve setup would help gain rpms or if its just helping meter fuel and block of the intake at the down stroke .
I want the head after if It isn't destroyed!!!!
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  #19  
Old 11-21-2013, 04:05 PM
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dodge dude94 dodge dude94 is offline
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Default Re: interesting experiance, trying to blow up a china girl !!

Quote:
Originally Posted by MotorBicycleRacing View Post
Your rpm's at 40.7 mph are 9500

20 tooth bevel gear to 82 tooth clutch gear = 4:1 to 1

Did you measure your tire diameter?
Most cruiser tires are 26.5" diameter which would make your RPM's 9,300

If you were going 35mph your RPM's were 8100
That's why my engine sounds so pissed off at me occasionally. lol
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2 WHEELS: '11 Huffy Good Vibrations, '11 Skyhawk GT5, 44t, CNSV2, NGK BPR7HIX, Bosch wire, shutupexhaust, 26x1.75kevlar tires, Tektro C230's, new stupid Bell chain
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  #20  
Old 11-21-2013, 05:00 PM
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massdrive massdrive is offline
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Default Re: interesting experiance, trying to blow up a china girl !!

I knew a guy with a 1970 302 cu in Ford Econoline van with 200k miles on it. Same thing he could not blow it up so he wedged a brick on the gas peddle with a broom stick and left it floored in park for 30 minutes. He couldn't take the roar of the engine anymore and shot it off! The next day he gave it to his step brother who put another 100k on it and gave it to his nephew. Lost track of it after that, for all I know it may still be running...

Try pegging the throttle with the clutch in. Just be careful when she does blow it may do some collateral damage. May do it in a open field or something...
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