Newbie questions #438-443

[Nic van der Walt]

Jo

I'm designing the parts I'll have manufactured for my bike's
EFI manifold and have been wondering about a couple of things.

Is there a standard form factor for injectors that I can base
the design on? Can I for example design for a Bosch injector
and then be able to swap injectors around until I get a type
that works well? Anyone have any dimensioned drawing they are
willing to share?

I take it the dynamic range of an injector is determined by the following
parameters:
Minimum on time.
Maximum flow. ( Depends on maximum pressure and nozzle )
Maximum on time ( Depends on max RPM and duty cycle  <140uS for 14000rpm )

What is a reasonable minimum on time for an injector? The injector
will have to flow around 3.5l/h at WOT. How do I go about actually
buying something? Any brand to look out for? What is a good fuel
pressure to work at?

I intend referencing the the fuel pressure regulator from the surge
tank to ensure the pressure differential across the injector is 
independent of boost pressure. Is it then correct to assume the 
charge delivered for a given pulse width stays constant regardless
of actual boost?

The bike currently has four carbs. I have been considering using the carbs
as is, closing of all the ports and mounting the injector basically opposite
of where the main jet used to be. This makes the mechanical side of things
very 
simple and cheap, but places the injector at a right angle to the air flow. 
Will this affect anything? Should the tip of the injector protrude into the
airflow or not?

Thanks
Nic.