Cruising RPM

[rdixiemiller]

What RPM does everyones truck like to cruise at? Mine really likes 2000 RPM. It feels like I really have to get on it to cruise at 2500, but it will run down the road all day at 2000.
2000 feels like it is at a sweet spot in the torque curve.

Anyone have a torque curve for the multifuel?

 

[JohnnyReb]

Mine is a D model and seems to like 2000 to 2250. Anything less than 2000 rpm feels like lugging. Also have to press engine to maintain anything above 2400.

 

[rdixiemiller]

Sounds a lot like mine. 2000 to maybe 2200 is easy cruising. I just didn't know if mine was different from everyone elses trucks. Mine is running 1100R20 singles, so I thought that might be the issue.

 

[Westech]

mine purs at 2600. Everything smoths out and it just flys. Last speed run was over 65 mph on a flat strech.

 

[Desert Rat]

Mine loves 2450. 2500 and she seems to strain, 2300 seems like she's wanting to drop to lugging around 1900 quickly. Now that Ken here in Houston is helping me I'm sure her characteristics will be changing. Updates soon.

 

[n3uka]

Mine likes 2500, I just hate running that for long periods.

 

[Stretch44875]

2200 on up is good, ran it to between 2700-2800 on a flat road before. Somewhere over 63 mph. Stock fuel settings(for now!) Really seems to take off over 2400 rpm.
Dennis
________
Buy roor bongs

 

[rdixiemiller]

I was wondering about cruising speed. On the multi fuel engine, do you want to keep the hammer down and sit on the governor? A detroit likes to be driven that way. Some others do not. I don't want to kill my engine by either staying too low, or by revving too high. My deuce just seems to like 2000-2100 rpm. Of course, that might just be my perception of the engine sound.

 

[Westech]

as long as it dont get too hot just let it fly. my foot only comes off if I get over 1000*

 

[Desert Rat]

Robert,
Multis like to be run hard but not maxed out. This is how a rod can be thrown or other nasty things. I stay about 150 to 250 rpm from top end because I want to have a cushion for going down hill and not stress out the drivetrain. It's also tough on bearings and bushings going full tilt. And finally the better fuel milage is found in the lower rpms.

 

[rdixiemiller]

Rat
That was kinda what I thought. I never like to run things to the red line either. In my younger days, the red line was a starting point......
But I am older now, and have bought some expensive lessons.

 

[Desert Rat]

Robert,
Me too!

 

[cranetruck]

The multifuel is rated for continous duty and can run at full power output for ever and a day. That's the military of the 1960's. The new engines are not rated for continous duty. I may be sticking my neck out here, but that from some research I did a few years ago.
My Multi loves it at 2,500 rpm and can go all day that way. It lugs at rpm's below 1,500 or so depending on the load.

 

[Low-Tech-Redneck]

Seems happiest at 2200 - 2300, though at 2000, and in 3rd, it'll roll up an 8% grade without a problem, doesn't feel boggy untill you go below 2 grand

 

[cbvet]

We drove 1,000 miles with a multifuel running flat-out at 2500-2600rpm. No problems. Used no oil, but a lot of diesel at 5 mpg!
CBVET

 

[ken]

I keep it at 1800. Fuel cost too much to run it that fast! I like to keep milage in the double digits. It hums right along at 1800 without lugging even with 8 yards of wet sand in the bed.

 

[Desert Rat]

Yeah, so long as the in tank pump works (right Ken?)

 

[Monster Man]

wow, mine really hates speed I guess. I'd say it would cruise perfect in 5th at 1600 RPM (assuming flat ground). 1800 cruises nice, and 2000 it gets a little bumpy. It'll drive up to 2800 RPM, no prob, but there's no way I'd want to "cruise" it there! Back from Idaho I kept it at 1900-2000

 

[Recovry4x4]

I ran mine about 2400 to 2500 the whole way. Runs at about 54 MPH. The fuel mileage suffers though. On a previous trip I ran a few segments at 52 MPH which is about 2200 to 2300 and the increase in mileage was significant. I was on a schedule so I ran it a bit faster this time. I have no problem taking the thing up to 2800 so I have to be careful or adjust the governor. I keep it like this in case I need to get out of somethings way.