2 Stroke Bike EFI

[David Chambers]

Brad Campbell wrote:
> 
> Has anyone had any experience with Motorcycle EFI Systems?
> I have a Yamaha RZ350 that I would like to put engine management
> onto, I am having difficulties with the hardware side of the fuel
> system.
> I have based my design on a HC11 as I already have boards for this
> processor and a lot of experience programming it. The mappable
> ignition is not a problem, that works already, but I am after suggestions
> as to injectors, fuel pumps and regulators for this application.
> As you can well imagine, there is not a lot of room to play with on a
> small 2 stroke bike. I was thinking of possibly using the fueling
> hardware off a small car, like a toyota corolla or possibly a hyundai.
> The catch is the injectors have to remain accurate to about 12000 RPM
> This, of course being the equivalent of a car revving at 24000 Rpm.
> I have thought about 2 injectors per cylinder and just sequencing them.
> Purely to allow them extra time to recover. And the injectors have to meter
> a lot less fuel, given each cylinder is only 175 cc's.
> Oil is already injected so I do not have a problem here.
> 
> Cheers
> 
> -------------------------------------------------------------
> Brad Campbell
> http://www.omen.com.au/~bcampbel
> "How can one piece of insulated wire bring so much happiness"
> <Homer Simpson on Cable TV>
> -------------------------------------------------------------
The Kawasaki GPZ900 was injected (I think) at least I have a set of
throttle bodies and injectors of one of these. Maybe you could try parts
off this bike, the regulator and pump are fairly small. But I think you
might have a hard time getting the opening time short enough and the
fuel flow high enough to inject a two stroke. Also some jet ski's are
injected but they only rev to 7-8000 rpm.
Good Luck.

David Chambers