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Old 17-03-2014, 08:46 PM
Richard L Richard L is offline
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Join Date: Oct 2003
Location: England
Posts: 4,936
Default Re: Testing methanol purity ?

This looks more like a injector design than a fluid induced problem.

I have often wonder how the iD managed to make a very high flow fuel injector with excellent response time so I dug a bit deeper. AFAIK, they reverse the pinto direction. Instead of the fuel pressure act against the direction of the sprung pinto movement, it assists it.

This requires some design changes in order for this to work.

1. The spring that pulls the valve shut has to be stronger
2. Higher flow (bigger orifice) requires even strong springs.
3. The 16 ohm coil can only generate a fixed electromagnetic force.

So based on the above assumptions, if you have not balanced the differential pressure in the dynamic condition of your set up, the injector is not going to open properly to allow a linear flow or stop injecting all together.

This condition will worsen:
1. When the injector coil heats up (less power)
2. 12V supply voltage is decreased. (voltage drop across a lesser wire gauge)
3. Boost pressure increase will slow down the opening time or event stop it from opening.

I think you should try running the injector with a 12V voltage boosted. or increase the differential fuel pressure regulator.

V^2/R = power

12x12/16 = 9 watts
15x15/16 = 14W watts

An extra increase of 1.5x [power feed to the injector coil.

This just a wild guess.
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Richard L
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