Carnage

[gearhead]

yea, after my clutch died I spent the rest of the time drinking beer...

 

[FordGuy100]

Talking to the chevy guys about pumps this is what I found.

They say if you open up the govenor (ie 4400rpm's vs 3300rpm's) alows more fuel to be let through the metering valve. It seems once the govenor approaches its RPM, the springs start closing off the metering valve, limiting fuel. That would explain why on a stock pump it feels like it falls on its face. So putting a different govenor spring in it will stop the spring from closing down the metering valve, and it wont feel like it falling on its face until the higher rpm's (which the same thing will happen, only higher up in the rpm's).

Hope that makes sense. Basically our trucks feel like they fall on there face due to the fact that the govenor spring is closing down the metering valve limiting fuel as we approach our governed rpm.

 

[FordGuy100]

Also, my research shows this.

We can get larger plungers for our DB2 pumps, up to .35" (stock .29"). A good starting point for more power is .310" plungers. But once we get past those plungers, it gets hard to get the flow of fuel past the metering valve. Basically the metering valve will be the limit to how much fuel. You have to have it, and you have to have the govenor spring to be streetable (without it, it will idle from 500-2000rpm's one guy said, thats a big swing in rpm's for "idle"). So if we tried to run .35" plungers we couldnt see the full potential as the metering valve wont let the fuel past it, and the plungers wont fill up all the way in time for the injection.