fuel injections for motorcycles

[Zoltan Lajber]

> Hi there,
> 
> is on of you working on - or already finished with a fuel injection for
> a motorbike?

Seymaz (switzerland) have a nice RC45... (185HP @ 14800, very good torque,
some more interesting things like variable geometry intake pipes...
 
> Whats a crank? And what do you mean with the timing wheel.A friend of
> mine who was in the team that designed the BMW Z3 engine told me that I
> would need four things:
> - -the rotation

But forget the bosch like 60-but-2-missing wheels, just a big pain in
bikes. you can use the original (8-but-1 missing from honda, 2x2+1 from
Kawa, for example).
 
> - -the temperature

of what?

> - -the CO2 after the zylinder and

I think you meen oxigen by lambda, but for bikes, it not necesseary
todays. But it helps to set up the engine too.

> - -the vacuum before the zylinder
> isn't that all - or do I need more data

If you go with custom setup, worth it to join the injection/ignition.

For the amount of fuel, you need to know the speed and load of engine.
The speed is simples with some inductiv or hall effect sensors.
The load could be determined in several way: from intake pressure, throtle
position, air mass flow.
Few of them need aditional correction, like intake air temperature, and/or
barometric pressure (you should read it from intak pressure sensor before
the engine starts).
Another necesary correction is the engine coolant temperature.
With this information, you can run a injection.

For ignition, you need at least the engine speed, but recommended to use
the load and intake temperature too.

To be able to syncronized with engine, you may need a refernce signal from
camshaft, or if you go for simple, from crankshaft. In this case you are
not able to use secvenctial injection, which may be a problem at low
speed.

If you need high power, move far the injectors, and tweak the software to
be able to handle it even at low speed.
  
Bye,
-=Lajbi=--------------------------------------------------------------------
 LAJBER Zoltan     lajber at esem1.univ-orleans.fr    http://jht.gau.hu/~lajbi
 E.S.E.M.,L.M.E.                       http://www.univ-orleans.fr/ESEM/LME/
 A member of HuLUG                  http://www.cab.u-szeged.hu/local/linux/