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Small fuel injectors problem

Posted: Thu Apr 01, 2010 4:34 am
by tobywuan
Hello everyone!.... I'm new in the forum! need help

I'm having troubles to find a fuel injector for my engine and I seriously need your help. I have a project to modify a carburatted small engine to EFI system. I have found all the components except the Injector (Of course I'm going to use MegaSquirt), the problem is that I need to find first all the other components. The engine is small (3.5 HP and 50.25 cc displacement). According to some test the engine SFC is close to 267 cc/hr.hp which is small. However I'm seeking to reduce that number with the injection technology.
I have to injectors in mind to be modified (reduction of the flow rate) 1) PL2-0155 RC injectors 155cc/min and 2) Keihin D30NA-CY2-0500 or D30NA-CY2-0501 which, according to the datasheet the flow rate is 1.56 mm^3/St at 2ms (still some modification has to be made ¡I think!

If anyone can give me a second opinion or someone who knows another injectors to be used please let me know.
An extra help if some knows how to modify a fuel injector!

Thanks a lot!

Re: Small fuel injectors problem

Posted: Fri Apr 02, 2010 2:38 pm
by drmiller100
rather then modify the injector, you could consider running a lower fuel pressure.

I don't know the relationship, but lower pressure drastically lowers the rate.

Re: Small fuel injectors problem

Posted: Fri Apr 02, 2010 2:41 pm
by Bernard Fife
Guys,

The pressure relationship details and a calculator are here: http://www.megamanual.com/v22manual/minj.htm#flow

Lance.

Re: Small fuel injectors problem

Posted: Sun Apr 04, 2010 9:29 am
by biker
Honda makes a scooter with fuel injection.
The model is called Zoomer.
50 cc and 4.1 hp.
Hope this will help you.

Cornelius