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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. |
Beefed up ignition??
Discussion at Motorized Bicycle Engine Kit Forum in the High Performance Bicycle Engine Tips forum. Could we just run a 12v CDI module in loss mode? Power it from a rechargeable battery. I was reading ...  | | 
06-04-2008, 06:48 PM
|  | Motorized Bicycle Apprentice | | Join Date: May 2008 Location: S.F. East Bay
Posts: 13
| |  Re: Beefed up ignition??
Could we just run a 12v CDI module in loss mode? Power it from a rechargeable battery. I was reading the post on the Walbro carburetor, and ended up on an RC airplane engine page here. They run their engines without an alternator or magneto, just use a NiCad and have no problems.
This way you could use the pulse wire from the engine and a hi output CDI.
Then you can get into crazy stuff like using the Shimano hub generator and a voltage booster to kick the 6v upto 12 volts using a voltage booster.
But, take all of this with a grain of salt, I am still mounting my engine, so this kind of performance mod is waaaayy down on my list.
Andy- |
07-03-2008, 11:14 PM
|  | Master Motorized Bicycle Builder | | Join Date: Apr 2008 Location: Albuquerque
Posts: 317
| | Re: Beefed up ignition??
has anybody checked the voltage of these? I measured two bikes from seperat supliers each at idle gave 10 volts when reved it whent to 12 easly ? Ive had extrordiary luck whit my direct hit by the way 40 teeth got me to 42 miles an hour! Not smart on one of these bikes but I did it in a safe place. |
07-03-2008, 11:16 PM
| | Master Motorized Bicycle Builder | | Join Date: Apr 2008 Location: Albuquerque
Posts: 317
| | Re: Beefed up ignition??
Stock bike no other mods porting etc. |
07-04-2008, 10:27 AM
|  | Master Motorized Bicycle Builder | | Join Date: Jun 2008 Location: Connecticut
Posts: 238
| | Re: Beefed up ignition??
Quote:
Originally Posted by fairracing31  I'm still working on it when I have time, still no luck. I have given up on finding something to fit. The Honda C50 is the closest thing I have found.
I wonder how to go from 6v to 12v. I know how to do it in a car, but not a motorcycle. If we can get 12v, that would open the door for us, maybe.  | You can do it with a "step up" transformer 6v up 12v but amps are cut in half. You can do it with batteries wired in series again 1/2 the amps.
In old cars we used a "step down" resistor, so we could use a 12v battery and keep 6v starter and all bulbs. We just put in a 12v generator & voltage regulator  Walter F. |
07-04-2008, 08:50 PM
| | Master Motorized Bicycle Builder | | Join Date: Apr 2008 Location: Albuquerque
Posts: 317
| | Re: Beefed up ignition??
I figured that pict out thats a gun barrel |
07-05-2008, 02:07 PM
| | Master Motorized Bicycle Builder | | Join Date: Apr 2008 Location: Albuquerque
Posts: 317
| | Re: Beefed up ignition??
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07-05-2008, 03:01 PM
|  | Motorized Bicycle Apprentice | | Join Date: Jul 2008 Location: North Texas
Posts: 10
| | Re: Beefed up ignition??
When I was a kid with my first car the routine was check the gas and fill it up with oil. Plugs fouled on a regular basis, so I stood the wires off from the plugs about a quarter-inch. That created a hotter spark and kept the oil burned off the plugs. I don't know if that will work for you.
Scott in Texas said that  Quote:
Originally Posted by Norman Wasn't there something about the coil windings using more with smaller gauge wire or was it less with a larger gauge wire? Heck I've got to do more reading on it. I'm now wondering if a guy couldn't rewind the mag's coil and get a better light? All this sounds like more work than I'm wanting to do I think I'll go ride the Harley. Chris is supposed to be sending me a cdi and I'll send him a light for the cdi so I can tear it apart and see whats inside. I'll have fun, fun, fun, until Bob take the blowtorch away. Sounds like a Beach boy song. 
Norman | |
07-26-2008, 07:15 PM
|  | Master Motorized Bicycle Builder | | Join Date: Jun 2008 Location: Longmont, CO
Posts: 1,072
| | Re: Beefed up ignition??
I've been doing a little research on stuff we could use for these motors, so I figured I'd post what I've found so far. Sorry about the organization, I'm just pasting excerpts from some posts I've made. Some may be new info, some old, who knows. Quote:
Originally Posted by jasonh I've been looking for a replacement CDI, but ours is not the traditional CDI. Most CDI's have a constant power source and constant ground, and it receives a "fire signal" coming from a secondary magnet/coil (or hall-effect sensor, or optical sensor, or even mechanical points) on the flywheel...in other words they use a minimum of 3 wires, unlike our 2. | Quote:
Originally Posted by jasonh Tj, the only problem with that CDI you posted, is our motors don't have a separate trigger coil. Most CDI systems have a charging coil and a trigger coil on the motor. We just have a single coil. So ours works a bit differently. I'm still trying to figure out exactly how...we may have something similar to the Briggs Magnetron system, but I haven't verified that yet. Once I get my new magneto and CDI in and I verify the bike works, I might rip into my old CDI and see what's up. | I know I have posted an animation and other info on the Briggs-type system, I just can't find it right now   |
07-26-2008, 07:21 PM
| | Master Motorized Bicycle Builder | | Join Date: Jun 2008 Location: Longmont, CO
Posts: 1,072
| | Re: Beefed up ignition??
ok here we go. First off, CDI test - help verify my results
is where the following is from. Quote:
Originally Posted by jasonh Magnetos output AC.
Yes, they are called CDI's as in capacitor-discharge-ignition. My beef currently is I cannot find anything about a real CDI that only has 2 wires. Everything I can find basically says this:
A CDI will take a constant power source and keep a charge inside. Then it gets a pulse signal from the motor and releases all that energy into the coil which then steps up the voltage big time and that gets output to the plug which has your lovely little spark.
We only have a power and ground on these, so I don't see how exactly they would work short of just acting like a normal coil and sending out a zap every time the magneto spins around and makes a pulse o' power.
Not to mention, how are these "CDI's" so darn cheap? I can't find cheap Chinese CDI's for under $50-75. | Quote:
Originally Posted by jasonh Right now I'm actually wondering it basically charges on the + pulse from the magneto, and then the - signal from the magneto is the extra "trigger" pulse. That seems like it could be logical, but I can't seem to find any info on anything similar.
Any ideas on what kind of ignition mowers use? | Quote:
Originally Posted by jasonh | Hopefully this helps us get somewhere with our ignition systems... | | Thread Tools | | | | Display Modes |  Linear Mode | 
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