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High Performance Bicycle Engine Tips We all want our bicycle engines to push our bikes faster. Get exclusive engine modification tips and suggestions from us.

Whats the best performance upgrade??


Discussion at Motorized Bicycle Engine Kit Forum in the High Performance Bicycle Engine Tips forum. ok, so i gues that's what i'm asking... what are the best mods for overall performance... with the ...
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  #31 (permalink)  
Old 10-12-2008, 11:47 PM
Motorized Bicycle Apprentice
 
Join Date: Oct 2008
Location: Oklahoma City
Posts: 7
Default Re: Whats the best performance upgrade??

ok, so i gues that's what i'm asking... what are the best mods for overall performance... with the smallest mpg loss... maybe even mpg gain. ?

cause see... with cars, there are tons of ways to get more power AND more mpg. ie: aftermarket intake... (air flows more freely into the engine and gives you more hp... without using more fuel) same goes for intake manifold... exhuast... let the exaust escape more freely... then air flows out of the cylinders better when expelled. better ignition systems (more efficiently burn up the fuel that's already there... jut more of it with a hotter spark, or even better efficiency through more precise spark timing. balancing your engine, so it moves more smoothly, with less vibrational resistance...

all those things (for the most part) give you more power without using more fuel.

this is what i'm asking... what are the best perfomance upgrades for this engine without using more fuel? would a nice long exhaust tube, like the one in new exhaust WOW!!! help get more HP without losing MPG or sacrificing engine longevity? and so on?

Last edited by okc_car_dude : 10-12-2008 at 11:50 PM.
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  #32 (permalink)  
Old 10-13-2008, 12:04 AM
Andyinchville1's Avatar
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Join Date: Dec 2007
Location: Charlottesville, VA
Posts: 345
Default Re: Whats the best performance upgrade??

HI,

In theory a properly designed tuned pipe can get you more power AND more mileage (see the animation of how / why the tuned pipe works and it will help you to understand....perhaps somebody has the animated link??....)

Of course if you hot rod around and have too much fun with all that new power your mileage will appear to go down BUT if you ride for mileage your mileage will go up with the tuned pipe (of course as a side benefit you do have extra power available for those times when yo do want to have some fun or have that extra steep hill to climb).

Hope this helps you.

Andrew
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  #33 (permalink)  
Old 10-14-2008, 04:33 AM
Motorized Bicycle Apprentice
 
Join Date: Oct 2008
Location: Oklahoma City
Posts: 7
Default Re: Whats the best performance upgrade??

So then... who do i go to, or where do i get this tuned pipe? or where do i get the program, or book for the formulas needed to make such a pipe? what kind of cots am i looking at?

also.. what about the stock air filter? i've seen a cool aftermarket one on one of these engines, before. do they actually do any good, besides look kool?
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  #34 (permalink)  
Old 10-18-2008, 09:33 PM
mechanickid's Avatar
Master Motorized Bicycle Builder
 
Join Date: Aug 2008
Location: nh
Posts: 192
Default Re: Whats the best performance upgrade??

i dont understand this, you guys are cutting the openings in your engines to make them bigger? what about a torque converter? Mini Bikes, Frames, forks and kits.
i would love to make my engine more powerful, how can tune my "expansion chamber"? whatever that is, im a noob. and how do i "Port" things? sounds like it helps a lot.

thanks guys.
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  #35 (permalink)  
Old 10-18-2008, 10:01 PM
Smoothe's Avatar
Senior Motorized Bicycle Builder
 
Join Date: Sep 2008
Posts: 77
Default Re: Whats the best performance upgrade??

grind out the openings (ports) to match each other. I did that this weekend with my BGF. It's a lot easier with pneumatic tools I tell ya. WHOA! Have you guys checked out the exhaust port & pipe that comes with BGF? Grind me a pound!
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  #36 (permalink)  
Old 10-18-2008, 10:13 PM
mechanickid's Avatar
Master Motorized Bicycle Builder
 
Join Date: Aug 2008
Location: nh
Posts: 192
Default Re: Whats the best performance upgrade??

but there's a tube that comes off the engine to the carb? there's no way to make that bigger.
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  #37 (permalink)  
Old 10-18-2008, 10:37 PM
Norman's Avatar
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Join Date: Jan 2008
Location: pampa texas
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Default Re: Whats the best performance upgrade??

you can make your own intake manifold shorter and angled off to one side for the tight fitting frames. I make the intake manifolds out of steel tubing and steel plate. I turn the outside dia. so the carb will be a tight slip fit on the tube then weld what ever type of manifold I need. same for the exhaust I use some templates for my sort of tuned exhaust and my homemade muffler.
I use skins off of wreaked vehicles mostly hood skins from the body shops. header pipes can be made out of thin will conduit and bent in a hand bender. Just don't breathe the fumes put off from welding the conduit as its poisonous I use plenty of ventilation. I burn off the coating first or grind it off.
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