Hi all, I'm using the 7.3 idi in an application that requires constant rpm under varying load. Actually all I need is idle and a constant 2400rpm regardless of load (well, up to max torque of engine obviously.) The engine is replacing a Ford gas 200ci inline 6 so torque/hp shouldn't be a problem.

I'm thinking if I could set max rpm >down< to 2450 or so then just let it run on the governors. But setting the high idle screw on the throttle shaft doesn't seam to do what I'm after. Is there another screw that sets high idle? I've done a little adjustment on a roosa master ip on a tractor we have, and high and low idle were both set on the throttle shaft. I assume the governor mechanism is different for that model of the similar pump, as it holds rpm with in a couple hundred of where the throttle is set.

Ben

 

there is no high idle adjustment since it is in automotive use IP. different gov setups then what you are used to on the tractor. only way to get idle to stay up at 2450 is to hold the throttle open to there by whatever means u want. linkages, electronic solinoids, air cyls, whatever.

 

Forgive me, sometimes I'm dense. I think you're saying that to hold say 2400 rpm I'll need a linkage, solenoid, etc. to keep adjusting the throttle position as load changes to maintain near constant rpm? If that's the case then we're talking about an external (probably belt driven) governor like most gas tractors, skid steers, power units, etc have.

Second thought,
Maybe it's out of the scope of this forum, but does anyone here have experience with the Roosa Master pumps in other applications (such as tractors/power units, etc.) as well as the 6.9/7.3 to ponder with me if the pump housing on the DB2 models in the 7.3 would be similar enough to industrial/ag applications to allow the governor components to be swapped out. And before I get the firing squad of "you can't open up a pump unless you're..." that's fine I'm willing to risk it. I'm taking any ideas/suggestions that involve opening the pump with an automatic "opening up the pump unless you're in a perfect environment is a bad idea, so do this at your own risk" disclaimer.

In case you're wondering why go through all this bother and not just get a diesel that will do what I want as is. My reply is that I like the 7.3, plain and simple, they're a 250,000 + mile engine, fuel efficient, plenty of support, compact (compare horsepower and cubes to CAT 3208!) they're just a good engine. Also they're easy to get, I intercepted this one on it's way to the scrap yard. Paid $250 for it runs great and I'd drove the truck before the auto trans went out. Honestly I don't understand why IHC didn't try them a little in some tractors, or other manufactures in industrial/ag/excavation applications.

Well, thanks guys I'll try to keep it shorter next time.