More on fuel injection.

David G · Sep 2, 2012

I am wondering if a throttle body fuel injector would work upside down like an updraft carburetor.

Ideas?

Bob M · Sep 2, 2012

Since the fuel supply is under constant pressure I can see no reason why it would not(!)

Anonymous-0 · Sep 3, 2012

I'm with Bob on this one. The injector doesn't pressurize the fuel; that's done by the pump, and the pressure controlled by the pressure regulator. The injector itself is basically a pintle valve.

MY questions on fuel injection concern a 6-cylinder IH truck engine. Since the intake ports are siamesed--and since the engine only runs 3600-3800 rpm--why couldn't you get by with running only 3 injectors? I'm thinking it would work; you'd simply have to trigger each injector on every crank revolution, instead of every other revolution.

Anyone out there experienced enough to tell me why I'm right...or wrong?

Sprint 6 · Sep 3, 2012

I doubt you could get proper atomization. GM TBI operates at a low 9-13 psi, I don't know if that is enough pressure to to spray the fuel up, I would expect a lot of drop out, as the vacuum is low on the injector side of the throttle blade. The small injector TBI operates at a higher 22-32 psi, that might be enough. It would be worth a try.

David G · Sep 3, 2012

It looks like I will go with a separate injector(s) and a throttle body. I bought 2 on ebay last night, one with a throttle servo and one without. I think I can make an electronic governor on the one with the servo.

More on fuel injection.

David G

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Bob M

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Anonymous-0

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Sprint 6

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David G

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