equations for inj. flow rate for small engine

[Clive Apps Techno-Logicals 416 510 0020]

> 
> I'm looking into efi-ing an onan 2-cylinder (about 18hp) 4-stroke gas
> engine.  Not a throttle body injection, but port (its easier to mount
> the injectors on the intake than to make a TBI with injectors.  What
> is the math that needs to be done to calculate the injector size?  How
> about TBI flow rate or diameter?  Thanks a bunch!


you need approx .5 lb /hp-hr
gas is about 6-7 lb /gal

Clive