Maintenance & Technical > KX500 Original
fuel injection in 500's ?
Brute:
Just got to thinking that a lot of Sleds are or were injected twin or triple 2 cycles. Some around 700 cc's, but there were 500's also. Could use the system and have two injectors? Or at least use part of the system. Just a thought.
snoopjonnyjon:
Arctic cat made a 1000cc twin in the M1000 and Crossfire 1000 that would be a good donor for a throttle body and injector. The software would be where it gets tricky me thinks.
It's really sad the development of the factory 500cc bike stopped almost 25 years ago. The KX barely changed after 1989. A modern bone stock 1000cc sled is 168hp on 87 octane, and lasts for thousands of miles between rebuilds, with battery-less EFI. I'd love a new 84hp dirtbike with half that engine in it.
cbrfrenzie:
You know, a good friend of mine has a turbocharged Ski-Doo 800R twin with factory carburation, and an aftermarket boost referenced fuel controller (from my place of business) controlling two fuel injectors based off of the crank pick-up. He is making the somewhere in the 260 HP range, the injection system works very well. We simply leaned out the main jets and tuned the rest with the axillary injectors.
I'm starting to wonder if a vacuum referenced fuel map would give enough information to create an accurate fuel table for one of these 500cc single cylinder engines. Thoughts? :?
Motorrad:
--- Quote from: cbrfrenzie on September 17, 2012, 02:25:33 PM ---You know, a good friend of mine has a turbocharged Ski-Doo 800R twin with factory carburation, and an aftermarket boost referenced fuel controller (from my place of business) controlling two fuel injectors based off of the crank pick-up. He is making the somewhere in the 260 HP range, the injection system works very well. We simply leaned out the main jets and tuned the rest with the axillary injectors.
I'm starting to wonder if a vacuum referenced fuel map would give enough information to create an accurate fuel table for one of these 500cc single cylinder engines. Thoughts? :?
--- End quote ---
I'm digging this idea. Would be great with a Lectron. And instead of a powerjet. You have injection to work the entire rpm range
cbrfrenzie:
--- Quote from: Motorrad on September 17, 2012, 02:32:08 PM ---I'm digging this idea. Would be great with a Lectron. And instead of a powerjet. You have injection to work the entire rpm range
--- End quote ---
Very true... with this controller you can choose an RPM input, up to 2 different 0-5V analog inputs, and/or use the on-board 2 BAR absolute pressure sensor to determine the injected fuel quantity. We have an injector flow bench at work too, so finding the exact injector specs makes controlling them that much more accurate.
Last thing is to power a fuel pump, injector(s) and controller, run a fuel line and install some kind of fuel pressure regulator. I'm sure a billet intake boot with injector boss would be pretty easy to fabricate. Aimed right at the center of the reed tips... :evil:
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