Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×

Thread Tools Display Modes
Old 06-18-2021, 09:35 PM   #1
New Member
Join Date: Mar 2021
Posts: 7
Mechanical 466 at higher elevation

Hi folks,

Iím learning the mechanical diesel life, but I have a question. I am running a 1987 Intíl 1954 with a mechanical DT466. I live and drive around Denver CO USA (about 5000í elevation). The truck is kind of a pooch, but it does fine. Iím heading to higher elevations tomorrow, and Iím a little worried itíll flood, and not restart once shut down. I have the mechanical shut down. Im wondering it it makes sense to start cranking with the shut off actually shut off, and slowly open it until the engine fires.

What do yíall think?

ster1 is offline   Reply With Quote
Old 06-19-2021, 01:01 AM   #2
Bus Nut
Join Date: May 2018
Location: topeka kansas
Posts: 943
Year: 1954
Coachwork: wayne
Chassis: old f500- new 2005 f-450
Engine: cummins 12 valve
Rated Cap: 20? five rows of 4?

I worry more that the turbo will not keep up with the amount of fuel and the engine will run too hot at the exhaust temperature. run the risk of burned pistons, burned valves, over heated exhaust turbine,

I have a hot rodded cummins mechanical injection engine. I also have gages so I can watch temperatures and pressures of the intake and exhaust.

I also have a bigger turbo than original to add more air to the engine.

magnakansas is offline   Reply With Quote
Old 06-19-2021, 02:56 AM   #3
Join Date: Aug 2016
Location: Gold Hill, OR
Posts: 172
Year: 2004
Chassis: Blue Bird
Engine: 2002 ISC / MD3060
Rated Cap: 40 ft, 36,200 GVW

Your concern is going to be too much fuel and not enough air while driving.

Hopefully it is tuned in such a way that your EGTs will never be too high, but you're talking about some good altitude.

If you find you're blowing a lot of black smoke, might wanna go easy on it. If you have an EGT gauge, then go for it and keep it under 1200.

I've not heard of "flooding" being an issue with diesels. Usually it just means white smoke as the diesel is vaporized and pushed out the exhaust when it's too cold to make fire.

Flooding in a gas engine is when you get to much liquid fuel in the engine and the fuel air mixture is too rich for flame. Diesels run lean (in those terms), there is almost always excess air.
WiredForStereo is offline   Reply With Quote
Old 06-19-2021, 06:53 AM   #4
Bus Nut
Join Date: Mar 2017
Location: iowa
Posts: 574
Year: 1998
Coachwork: bluebird
Chassis: chevy
Engine: 3116 catapillar
Rated Cap: formerly 71 now 2 or 4
your engine specs will tell you maximum altitude
mmoore6856 is offline   Reply With Quote
Old 06-19-2021, 06:55 AM   #5
Bus Crazy
Drew Bru's Avatar
Join Date: May 2016
Location: Grayson County, VA
Posts: 1,247
Year: 1996
Coachwork: Amtran
Chassis: International
Engine: DT466
Rated Cap: 65
We had our mechanical dt466 at 11,000' in the Flattops Wilderness Area in Colorado and spent a good bit of time around 8000' in other locations without issues. I doubt you'll have a problem in the warm months.
Our Build:
Drew Bru is offline   Reply With Quote
Old 06-19-2021, 10:31 AM   #6
Bus Nut
TJones's Avatar
Join Date: Jul 2017
Location: Rapid City, SD
Posts: 815
Year: 2001
Coachwork: Blue Bird
Chassis: CS RE
Engine: ISC 8.3 L 260 hp
Rated Cap: 36
You will want to down shift and back off on the throttle if your blowing black smoke. The engine HP/ torque will be effectively derated at altitude.

At altitude the engine will likely not get as much air as it would like. A diesel will pull as much air as possible through the engine and rpm /power output is regulated by the fuel rate. If there is less air available you will have to add less fuel.

It would be a good idea to make sure your air filter is clean so you are restricting air flow as little as possible. Also if the engine is intercooled clean your radiator and intercooler fins so that your air charge is as cool and dense as possible. A freshly cleaned radiator will be less likely to over heat as well.

TJones is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 06:02 PM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.