Just wondering whether its possible to hook up a bike alternator to my G13B. Mount it on and use the air conditioning pulley as it rotates.

Anyone thought of doing this before or am i nuts to even think about it?

Thought about it but motorbikes have an in-built alternator (inside the crankcase).

Dan

aren't most bikes 6 volt system?

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Too many cars, and too little time.

some the newer big bikes are moving to 12 v but the alternator output is tiny. Mainly because there is nothing to power.

yeah, not a really great idea. bikes don't charge till about 5 grand and to top it off the output wouldn't power a car.

and yes all the bike alternators I have seen are mounted in the block on the end of a crankshaft.

Possibly as a sugestion if your looking for a small alternator try a importer or a wrecker a small toyota or daihatsu or maybe a suzuki would be the manufacturers with small alternators spring to mind. but you still want a decent output if you plan on running much in the way of electrics.

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-doing a Degree in Mechanical Engineering,
and a few conversions:
13B Extend in a 1600
4EFTE in a mini ute (all slowly)

The smallest conventional alternater you will find is off a Kuboto tractor (I've seen them
used on Vincent motorcycles) but extreamly hard to get
What is wrong with the Suzi alternater?
If you want to see how to mount it I'll send you some picies

Blue

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Keep shiny side up

I've been looking around and found this Compu-Fire 3 Phase 40 Amp Charging System.

http://www.compufire.com/pages/harley-main.html

Charges 25 Amps at Idle and 40 at 2800rpm. I've emailed Compu-Fire but dont know if i'll even get a response. What does a harley rev out to? 7 Grand? Would it be just a matter of making the stator spin and mounting the outer cover to the engine somewhere. I was thinking of making a custom cam gear cover anyway and just mount it to it and mount the stator onto the outside pulley.

The reason i'm looking into this is because of my frame design, i've built the frame and forgot to take into account the alternator and belt. I can reverse the intake manifold and put the alternator up there, or i can try this.

Some of the Kawasaki bikes (like ZX1000) have a separate alternator, much like a car one only smaller. A modern 1000cc bike has nearly as much electrical load as a car so the alternator may have enough grunt to do the job.

The guys here at work used them to made up some little field portable gensets for powering laptops etc, in the Antarctic.

Tim

A lot of BMWs run a seperate alternator, dunno how easy they would be to use. A K series alternator is over 400 watts I think, the latest K1200GT has almost 1000 watts. They would be expensive and hard to get I should imagine.

The last 6 volt motorbike I saw was a Holda Supercub. Most are 12 volt and still require a bit of power since they often have two headlights like a car, and they are often always on. Generally no stereos to worry about tho!

heres a gsxr 600 alternator. looks like it could work depending on output.


gpx750


just do a google image search or try ebay

cheers
kev

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my swiftmini @ http://www.16vminiclub.com/forums/viewtopic.php?t=4888

Here is a quick run down on an Electrical System fitted to a GSXR


Technical Specifications for the Suzuki GSX-R Electrical System
Battery
Capacity: 12V, 8Ah
Electrolyte Specific Gravity: 1.320 at 20oC
Current Leakage: 1 mA (max)

Alternator Stator Coil Resistance
GSX-R600 and GSX-R750T & V Models: approx. 0.3ohms
GSX-R750W & X Models: 0.24 to 0.36 ohms

Alternator Output (max)
GSX-R600 and GSX-R750T & V Models: approx. 378W @ 5000rpm
GSX-R750W & X Models: aprox. 406W @ 5000rpm

Unregulated Voltage Output (no-load)
GSX-R600 and GSX-R750T & V Models: min. 55V (ac) @ 5000rpm
GSX-R750W & X Models: min. 70V (ac) @ 5000rpm

Regulated Voltage Output: 13.5 to 15.0V @ 5000rpm

Starter Motor
Brush Length (min): Not available
Starter Relay Resistance: 3.0 to 5.0 ohms

Fuses
Main: 30A
Headlight (High Beam): 15A
Headight (Low Beam): 15A
Turn Signal: 15A
Ignition: 10A
Tail Light (except GSX-R750W & X): 10A
Fuel System (GSX-R750W & X): 10A

Bulbs
Headlight
GSX-R600 and GSX-R750T & V): 55/50W H4 Halogen x 2
GSX-R750W & X: 60/55W Halogen H4 x 2
Sidelight (UK Only): 5.0W
Brake/Tail Light: 21/5W x 2
Turn Signal Light: 1.7W
Neutral Indicator Light: 1.7W
High Beam Indicator Light: 1.7W
Fuel Warning Light: 1.7W

Not sure if anyone has guessed but iam quite keen to use a bike alt, its something i have been looking into for a while.

The GPX750 is belt driven also.

Cheers

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my swiftmini @ http://www.16vminiclub.com/forums/viewtopic.php?t=4888

very interesting

that gpx750 one looks like it has a very small pulley on it also, and given the size of our crank pulleys (significantly larger than the average bike I'm guessing) the 5000rpm output might come down to 2.5 or 3000 - might

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did I tell you that I won a trophy?