Small TBI

[Ray Wasson]

I would like to know if it would be practical to pursue what I have in
mind. My hobby & sport is designing, building & flying radio cont. model
aircraft. I understand the mechanical aspect's but I know very little
about electronics other than the basics. About 15 years ago I designed &
built a carburetor for a 440cc ultralite airplane eng. It worked very
well. In other words I know what I need as far as fuel curve etc., I
just don't know how to do it or if it can be done electronically. What
is needed is a reliable TBI system for 25 to 100cc 2 stroke engines. The
requirements are as follows.
Weight is critical. Desired weight under 8 oz. incl. batt..
Reliability. Would be subject to a lot of vibration.
Fully adjustable fuel curve. Be able to adapt to diffrent engines with
diffrent requirements.
The RPM range would be approximately 1000 to 10,000.
The carburetors now used are just not sophisticated enough to run smooth
at all throttle settings. Besides, in the future these small engines
will be subject to emission standards.
I have in mind a constant flow system with vane type air flow sensor &
possibly a stepper motor working on a pressure regulator. It would be a
low pressure system using crank case pressure to the fuel tank for fuel
supply. Plenty of mixing takes place in the crank case of these engines.
For starters, an acceleration & lean cruise circuit will not be needed
unless it would be easy to include.
Does any one think this is feasible and have any ideas?.
Thanks for listening.
Ray Wasson