Cruising speed and rpm?

[stumps]

Well, my speedmeter is corrected for the larger tires with the appropriate adapter (on the transfer case).

Ok, but that isn't as the manufacturer intended

It makes no sense to compare your modified situation to a stock deuce.

-Chuck

 

[jfnemt1ff1]

Check out the intank pump , and make sure it is pumping I had one that a the same type of thing going on and that fixed it.
John

 

[stumps]

Amen stumps! Lol so any thoughts why I can't get this thing over 2100? My throttle rod from the pedal to the ip arm has a smooth curve in it but i believe that isn't an issue. When you depress the pedal you can feel and hear the point where that spring on the rod starts depressing and then there is probably another 1.5 inches of travel past that point. So I'm under the assumption it's getting full throttle. However, is it possible for the return spring to pull against that governor spring and not let the arm travel all the way to a full position?

I am not an expert on the MF injection system in any way shape or form. I hope to be before I am done, but who is to say when that will be?

If you can't get the RPM's up in 5th gear, the question that comes first to my mind is can you *ever* get the RPMS over 2100? Try it in neutral, and slowly bring the engine up to the 2600RPM limit. If you can get to 2600RPM in neutral, you eliminate the governor as the cause.

If it is not the governor, then that leaves a bunch of insufficients as possibilities:
Insufficient air, insufficient fuel, insufficient pedal. And one excess as a possibilitie: excessive load on the engine.

Insufficient air will result in black smoke. Long before you get to that point your air cleaner tattletale should be all red. A stuck turbo will result in insufficient air at higher RPM's in a big way!

Insufficient fuel will behave exactly like you don't have the pedal depressed enough. Possible causes are a near empty tank, clogged fuel filters, a stuck Fuel Density Compensator, problems in the injector pump head, and incorrect adjustments. I usually like to assume that the adjustments are correct, and something has failed.

Excessive load is typically caused by dragging brakes, or mismatched tires on the two rear axles. All 8 of those tires are hard geared to each other if one is larger diameter than the rest, it will be skidding until it is wears itself down to the same diameter as the others. While this is happening, you will have a real dog of a deuce on your hands. Dragging brakes make the drums get very hot.. possibly stinky hot. Dragging tires makes the offending tire get hot, and its tread becomes very black and freshly ground looking.

Deuces hate hills. A 5% incline will drop my maximum speed to 35MPH in 4th gear.

-Chuck

 

[Desert Deuce]

Well, my speedmeter is corrected for the larger tires with the appropriate adapter (on the transfer case).

As well it should be. These trucks are rated to run 11.00x20's (singles or duals is not the issue). Check your data plate. The appropriate adapter is correct by the manufacturers standard.

I run 11.00x20's on deuces as well and will correct the speedos someday.

 

[cranetruck]

Here you go stumps, all standard parts...

 

[stumps]

Here you go stumps, all standard parts...

Thank you! I can't help but notice that the cross reference listing you provided doesn't include the M44 series in the listing for the lower ratio gear. An oversight no doubt.

If one had the lower ratio speedometer gear, that raises the deuce's top indicated speed to just shy of 60MPH.

Interesting to me is that one info plate, on my deuce, says the top speed in 5th is 56MPH, and then another info plate lists the tire pressures for single 11x20, and dual 9x20 tires. Although I have never seen any plates that listed different top speeds, or didn't list the pressures for both the singled 11x20, and dual 9x20 tires, it is possible that the plates are wrong in this regard... that, or both the 11x20 and 9x20 tires are the same diameter. I can't say one way or the other, as I have never measured an 11x20 tire.... I kind of favor the idea that 11x20 and 9x20 NDT tires are the same diameter.

Inconsistencies are annoying, so the military goes out of its way to avoid them. I'll have to look up the the number of revolutions per mile for both the 9x20 and 11x20 NDT tires to see what is really up.

-Chuck

 

[M1075]

I kind of favor the idea that 11x20 and 9x20 NDT tires are the same diameter.

You can favor it if you like, but they are not the same diameter.

 

[stumps]

You can favor it if you like, but they are not the same diameter.

Ok. As I said earlier, I have not measured them, so I can't know either way. They could have made the 9x20's and 11x20's the same diameter if they wanted to by a slight change in the profile.

-Chuck

 

[cranetruck]

The 900-20 and the 1100-20 tires are both 100% aspect ratio tires, so take it from there.

 

[m-35tom]

stumps, if your truck drops that much speed on a 5% hill, your fuel rate must be set very condervative. and yes the 11:00 tires are larger, they are just by chance almost exactly the same as 14.5R20 which is very convenient.

tom

 

[rlwm211]

I run 48-52 with my deuce. It runs about 1850-2150 R.P.M. in that speed range and seems to be very happy at that speed. I have significant wind resistance with the S280 on the back and that tells more in acceleration than it does at speed. I know it is not weight because the box is almost empty.

I wondered why my truck smoked as much as it did. I washed the filer as per the PS article and I was amazed at the amount of dirt that was in the filter as evidenced by the mud in the bottom of the tub I used to wash the filter in. Even though the air filter monitor was not in the red, this made a fairly big difference in how well my truck runs, and it runs with much less smoke.

I am sure that there is some simple problem as to why "TeamAL2.5" 's deuce will not rev up. There are some very valid suggestions to figure out hos to fix the problem. If the brakes are dragging the hubs will be too warm and that would be an indicator of that. The principle is super simple regardless of what size tires you have so check all of the systems and I am sure you will find your problem.

Just my two cents

RL

 

[stumps]

stumps, if your truck drops that much speed on a 5% hill, your fuel rate must be set very condervative. and yes the 11:00 tires are larger, they are just by chance almost exactly the same as 14.5R20 which is very convenient.

tom

I couldn't say, the truck is really new to me. It was getting about 7.4MPG for the 1200 mile trip home with its K-Mart M109 shelter on the back, and about 3000lbs of payload. Most of the trip was between 45 and 50MPH as measured by my GPS. On level ground I could get it up to 55MPH, but hills brought it right down. I think the grade that brought it down to 35 was 5%. It was marked on the turnpike with a warning sign.

My deuce has had the FDC bypassed using plugs, rather than the usual pipe trick. It doesn't smoke hot, or cold, or when pressed hard.

I will explore the issue further when I get some other more pressing things taken care of.

-Chuck

 

[Desert Deuce]

I couldn't say, the truck is really new to me.

Welcome to SS, now respect your elders young man!

Just kidding, well sorta.

Some of the folks replying to you are some of the best resources in this business.

I'm really surprised that you'd make an assumption that the 11.00x20's and the 9.00x20's are the same diameter. I (and most here) don't need to wait for you to measure, I've got over 125 of each mounted on running trucks and trailers. They are not even close!

Chuck. don't get analysis paralysis.

Just some freindly ribbing Chuck.

 

[stumps]

Welcome to SS, now respect your elders young man!

I gave up being young a long, long, time ago. I give respect where respect is due, but when the gray came to my hair, I stopped granting respect automatically.

Besides, what have I said, or done that would lead you to conclude that I lack respect for the gentlemen I have been corresponding with?

Just kidding, well sorta.

Some of the folks replying to you are some of the best resources in this business.

Glad to know that.

I'm really surprised that you'd make an assumption that the 11.00x20's and the 9.00x20's are the same diameter. I (and most here) don't need to wait for you to measure, I've got over 125 of each mounted on running trucks and trailers. They are not even close!

Now how exactly would I know that? I don't have any 11x20's to measure, or compare the 9x20's to. At the point where I made the statement about researching the diameter, nobody had yet ponied up that information.

The literature doesn't seem to be exactly bursting forth with information, such as tire diameters, and revs/mile.

Also, what did I say that made you think I believed 11x20's were the same size? What I thought I conveyed was that either the information plates on every single deuce ever made were wrong (with regard to maximum speeds), or maybe 11x20's and 9x20's were the same diameter. They could have been made to be the same diameter, but apparently all deuce data plates are simply wrong (with regard to maximum speeds).

Just some freindly ribbing Chuck.

And I'll take it as such... up to a point.

-Chuck

 

[rlwm211]

Well now, there is an interesting point you must consider:

How does the speedometer know what size tires are on the truck?

It would make no difference to the speedo or the tach whether you had 9x20's 11x20's or 24x36's on the truck.

The ratios of the Speedo and the tach as it pertains to speed indicated do not change unless you change them as pointed out in an earlier post.

Now picking on your elders.....I will leave that one alone

Just my two cents

RL

 

[Recovry4x4]

The 900X20 is around 39" tall and the 1100X20 about 43. We had an issue like that with a truck out of TN. Adjusted the throttle stop (overspeed governor) while on the road and got the truck from 47 to 58 MPH. Ran it that way 900 miles home without an issue. Between that and a soft fuel rate, I'd say the problem lies.

 

[kc5mzd]

I have trucks some with 11.00 and some with 9.00 tires. It is easy to tell the 11.00 is taller just by looking at them. Also the 11.00 is 11 inches and the 9.00 is 9 inches. The 11.00-20 is about 11 inches of rubber on top + 11 inches of rubber on bottom + 20 inches for the rim or 42 inches tall. The 9.00 is 9 inches + 9 inches + 20 inch rim = 38 inches tall. Things were a lot easier in the good old days when every thing was in inches.
If your truck will make it to 2600RPM in the lower gears but not 4th or 5th then it could be a stuck fuel cut off cable not letting the rod go all the way back into the pump.

 

[G-Force]

Read this cover to cover

http://old.steelsoldiers.com/index.php?module=pagesetter&type=file&func=get&tid=1&fid=file&pid=57

It tells you how to diagnose your fuel system and fix it.

 

[kc5mzd]

G-Force there is something thats just not right with your Avatar icon...

 

[Desert Deuce]

Sorry Chuck, my humor tends to be a bit harsh at times. I didn't mean elders in age, but experience. I thought some of your answers were a bit curt with those trying to help. But I could be wrong, it happens on a daily basis. Truley no harm meant.

The one statement that is serious though is don't get wrapped up in analysis paralysis.

You may also want to do a compression check. I've got the heads off of 2 LDS's right now and all 4 are cracked in the expected places. They're on the way to get magnafluxed tomorrow. Like the others have said, fuel system needs to be checked top to bottom.

The turbo is also very tight, maybe not spinning. The truck was very low on power so we are tearing the top end down. It also has a blown head gasket. So many things to check.