From: Squirt_Truck (squirt_truck@yahoo.com)
Date: Fri Dec 17 2004 - 13:17:12 PST
Welllll,
1200 degrees is not that bad on the EGT if it does not
stay there long enough to coke the oil. Unless you
have the pump turned way up then it become a self
limiting factor, once you roll over the power hump the
temp will drop off and the excess fuel will cool the
EGT.
Diesels ALWAYS run lean, there is no mixture
adjustment, always excess air until the fuel
overwhelms and the exhaust goes totally blace or even
whiteish gray.
1500 degrees will not hurt your turbo for short pulls.
Remember these engines have a fairly flat power curve,
it is better to downshift at a higher RPM and not lug
the engine so much, Lugging loads the rings and
bearings excessively. I believe that 1800 is the
maximum downshift RPM.
Squirt_Truck
--- Bjorn Brandstedt <super_deuce@hotmail.com> wrote:
> Drove back to the sawmill again today for another
> load of lumber.
>
> The road has a lot of ups and downs and I speed down
> one hill to get the
> momentum going for the next hill. I'm in 5th going
> downhill at about 50-55
> mph. It's enough to make it halfway up the next hill
> and I watch the
> pyrometer every time, since it hits 1,100 to 1,200
> degrees as soon as the
> engine gets loaded down. I easy off on the "gas" and
> shift down at about
> 1,400 rpm.
> My point is that without the pyrometer, it would be
> so easy to just keep
> stepping on the gas to keep the speed up going
> uphill, but the EGT would be
> way over 1,200 deg F in a very short time.
>
> I think my question here is: Am I running too lean?
> Should the fuel delivery
> be turned up?
>
> Tire pressure observation:
> The total vehicle weight was about 21,000 lb today
> again. There were a lot
> of 14 ft long boards in the load that hung over the
> back by about 4 feet.
> The result was that the front was very light and I
> enjoyed "power steering"
> all the way home.
>
> This morning the tire pressures were all about 66
> psi.
>
> Arriving at the mill: Front 75 psi and rear 70.
>
> Returning home the tire pressures were checked
> again: Front 73 psi and rear
> averaged 77 psi. The difference reflecting the
> loading. The rear tires were
> also warmer to the touch.
>
> The fuel milage was too good to be made official. I
> use a dip stick in the
> fuel tank to measure the level and it used only 5/8
> inch for one 22 mile
> drive ( with load, no less). That comes out to about
> 2 gallons, for 10
> miles/gallon! The interaxle drive shaft is removed.
> The front wheels are not
> freewheeling because without the drive shaft in the
> back, front wheel drive
> is needed from time to time.
> The tires in the front are brand new and the drive
> axle in the back has been
> removed since they were installed. After 350 miles,
> the tires show no signs
> of wear at all. New shocks were also installed.
>
> Bjorn
>
>
>
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