Dodge Dually Nut wrote:Thanks for the info. I've been saying 91.5 because I have the 8 in frame. On another thread on this site they used that definition. It doesn't really mater that much any way. How every it went thru its path to me from the factory it is currently a 8 in frame non inter cooled truck. Yes I notice the bigger fan and assumed the whole assembly was different. Are the two engines different horsepower? The 92 has a know history of additive in the fuel for injector lubrication. I'm think I should at least switch them. I have a friend who has a 92 and had his freeze up and he barley made it home. Will I have to bleed them or do you think the air will work its way out?
They are the same horsepower rating, but there are some small differences;
1. NON-IC engines used a wider bowl piston, matches the 155degree spray angle of the injectors.
2. The injection pumps are slightly different internally, obvious difference is the KSB and the delivery valve holders on the rear of the pump.
3. The KSB on the injection pump operates opposite of each other. NON-IC KSB is advanced without 12v applied, and retards the timing to normal with 12v. IC is the opposite, normal timing without 12v, advanced timing (cold weather) with 12v applied.
4. Injectors are different. NON-IC have 9mm tips w/155 degree spray angle, 4 hole x .013"...while IC engines have 7mm tips w/145 degree spray angle and are 6 hole x .009"
5. You already pointed out the differences in the intake horn and plate, injection lines, etc., but you'll need the throttle bracket and move a few sensors around.
I've basically converted some of the stuff on my 91 over to the IC stuff, but its a mix and match deal. I have a IC pump with NON-IC DV holders, KSB is now on a switch fed from a different circuit. The injection lines are NON-IC, running the NON-IC intake plate with a 2nd gen intake horn. I had to modify the IC throttle bracket to clear the lines.