DUMMY QUESTION....

[CaptTom]

Hookaaay... when adjusting the fuel on an IP, it is constantly referenced to turn them by a "flat". Since the adjustment screw is an allen head, not a bolt, are we talking about one flat being to the next flat side of the allen wrench? :***:

Ya know.... I just gotsta ask before I fall "flat" on my face.

 

[Slade]

No dumb questions here, and yes it's referring to the flats on the allan wrench. Make sure you have a pyro before cranking it up so you can keep an eye on your exhaust gas temps.

 

[icanfixall]

Yes, you are correct so... If you break it down by turning up the fuel screw you have moved the screw 6 6ths of a turn. Really nothing on the planet will measure that amount of a turn. An allen wrench has 6 sides or flats to it. So one flat is one 6th of a turn. Seems like a tiny amount but hold on.. It makes a big differance..

 

[Wyreth]

Saved me from asking this very same question in a few weeks.

 

[CaptTom]

Saved me from asking this very same question in a few weeks.

Glad to take a hit for the team.

BTW- one flat is 60* of adjustment. That is pretty big....depending on thread size. Of course, set screw is probably fine thread, which is a shallow adjustment... But never seen it out so no clue. Lol

Thanks for the answer!!!!

 

[OLDBULL8]

Here is what can happen if the screw is turned in too far. Your pushing/spreading/extending the C ring which in turn extends the rollers out for more piston stroke.

 

[plywood]

Also you turn the screw in to increase fuel, or clockwise. Opposite a gas carb.

It's been a while, but it seems to me if you're doing it on the truck the IP has to be in the right position. Probably TDC compression for no. 1.

 

[CaptTom]

Nice pics OB...which raises one more question.... where is zero or the starting point if I end up twisting and cohorting the adjustment around and forget from where I came?

 

[gandalf]

To the best of my knowledge there is no "zero" point. The best you can do is keep track of how far you turn it, how many flats, so you can return it to the setting where you started. You test it by gauging the power increase with your buttometer, versus the temperature increases on your pyrometer. You don't want it to run too hot, or smoke too much. Basically, you play with it till it feels good.