Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 05-19-2013, 05:51 PM   #1
Senior Member
 
troyrice76's Avatar
 
Monaco Owners Club
Join Date: Jul 2011
Posts: 231
Driving up a grade

When driving up a long grade I am not to concerned about speed but don't want to run to hot. Should I try to keep the coach at a certain RPM to keep the engine spinning and cooling better.

Thanks,

TR
__________________

__________________
Troy Rice 2011 Newmar Mountain Aire 4344
2013 GMC Denali 3/4 ton Diesel Toad
Great Wife, two beautiful kids, and two funny pups
troyrice76 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 05-19-2013, 05:55 PM   #2
Senior Member
 
DSL417's Avatar


 
Entegra Owners Club
Join Date: Sep 2012
Posts: 6,213
Blog Entries: 2
Spartan says use that diesel engine by shifting yourself. Don't worry about revving at 2100 RPM. Don't let it lug down. That's from the Chassis owner's Class week before last.
__________________

__________________
Dave and Beth
2015 Cornerstone 45J
Ford F-150 and 2016 Polaris Razor
DSL417 is offline   Reply With Quote
Old 05-19-2013, 06:07 PM   #3
Senior Member
 
Steve Ownby's Avatar
 
Join Date: Nov 2008
Location: Cosby, Tn
Posts: 6,398
Quote:
Originally Posted by troyrice76 View Post
When driving up a long grade I am not to concerned about speed but don't want to run to hot. Should I try to keep the coach at a certain RPM to keep the engine spinning and cooling better.

Thanks,

TR
No long grades the accepted drill is to need the rpm p close to the hp peak which is generally at the governed rpm. If your engine heat keeps climbing then down shift another gear and back off the throttle some.
__________________
Steve Ownby
Full time since 2007
2003 Monaco Signature
Steve Ownby is online now   Reply With Quote
Old 05-19-2013, 06:42 PM   #4
Senior Member/RVM #90
 
MSHappyCampers's Avatar


 
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 26,345
I try to keep the engine RPM's above 2000. Don't know if that's right or wrong, but someone told me that back when we bought the MH!
__________________
Joe & Annette

2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
MSHappyCampers is offline   Reply With Quote
Old 05-19-2013, 08:14 PM   #5
Senior Member
 
rvjimmy's Avatar
 
Newmar Owners Club
Freightliner Owners Club
Join Date: Mar 2011
Location: Almond, Wisconsin
Posts: 1,455
You only are going up the hill as fast as you have power. Find the speed that all runs good and don't bury your foot to the floor.Just back out of it a little and let it go up the hill as you keep your RPM at 2000 to 2100. Works for me and will use less fuel that keeping your foot in it. Jim PS as I have a DP that's how I do It.
__________________
2002 Newmar Dutch Star DP3569 330 CAT - Toad Jeep Liberty, DW is the Nagivator. Work to travel and everything revolves around the price of diesel.
rvjimmy is offline   Reply With Quote
Old 05-19-2013, 08:34 PM   #6
Senior Member
 
2 Stroker's Avatar
 
Join Date: Nov 2009
Location: Warren, Oregon
Posts: 1,723
I just had the SilverLeaf VMS 330 installed, it gives all the reading in real numbers and was told when going up a grade to keep the torque at the peak just before it drops off to get the best mpg plus it reads coolant temp, mpg, trans temp and the gear you are in and a lot more. Money well spent.
2 stroker
__________________
2006 Country Coach Inspire 360 40ft Genoa Designer Series, Samsung 197 RR
Cat C9--STEEL & COPPER Bolt Together Radiator w/ updated rubber mounting
SilverLeaf 330 Magnum 2812 PSW 2011 Ford Edge Sport-Air Force One
2 Stroker is offline   Reply With Quote
Old 05-19-2013, 11:01 PM   #7
"Formerly Diplomat Don"
 
Dutch Star Don's Avatar
 
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 9,306
Diesels are not like gassers and don't climb well by wringing their necks, like gassers do. That actually becomes counter productive. You should really find out what the max torque and horsepower rpm are for your engine. This will help you drive more in your power range and get better mileage. Mine climbs well at about 1700 rpm. If I try to rev past that, power just drops off. "2 Stroker" has it right, run the engine around the max torque rating. If it starts to get hot, either take your foot out of it, or drop a gear and bring the rpm's up to spin the fan faster, while slowing down at the same time.

After a few hill climbs, you should get to know your engine and it's capabilities/limitations. Pouring on the throttle when you don't have the power will just waste fuel and overheat the engine.
__________________
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab
Dutch Star Don is offline   Reply With Quote
Old 05-19-2013, 11:23 PM   #8
Senior Member
 
dons2346's Avatar
 
Country Coach Owners Club
Join Date: Dec 2010
Posts: 4,491
Quote:
Originally Posted by 2 Stroker View Post
I just had the SilverLeaf VMS 330 installed, it gives all the reading in real numbers and was told when going up a grade to keep the torque at the peak just before it drops off to get the best mpg plus it reads coolant temp, mpg, trans temp and the gear you are in and a lot more. Money well spent.
2 stroker
That's right Floyd. With the RPM right at max torque, the motor will run most efficiently and won't overheat. You won't burn past anyone up the hill but then again, they aren't buying your fuel.

With our variable speed fans, we can run the RPM up and try and go up the hill faster at a lower torque figure. Those with rear radiators have to use higher RPM's to rely on the water pump to pass a large amount of water to cool the beast
__________________
dons2346 is online now   Reply With Quote
Old 05-19-2013, 11:29 PM   #9
Senior Member
 
Mr_D's Avatar
 
Solo Rvers Club
iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 28,521
Quote:
Originally Posted by 2 Stroker View Post
I just had the SilverLeaf VMS 330 installed, it gives all the reading in real numbers and was told when going up a grade to keep the torque at the peak just before it drops off to get the best mpg plus it reads coolant temp, mpg, trans temp and the gear you are in and a lot more. Money well spent.
2 stroker
The "problem" with the torque and HP on any of the Silverleaf displays is that it's just programming in the unit. It doesn't actually measure anything. They just program in the power curve of the engine using factory info.
Got this info by asking on their forum sometime ago.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 CR-V
Mr_D is online now   Reply With Quote
Old 05-19-2013, 11:32 PM   #10
Senior Member
 
Ramzfan's Avatar


 
Winnebago Owners Club
Freightliner Owners Club
Join Date: Dec 2010
Posts: 730
I have been told by both Cummins & Cat Mechanics that if you want your engine to stay cool when climbing hills, keep the RPM's at 2,000 or more.
__________________
06' Itasca Meridian 36g with CAT 350
2011 Jeep Wrangler 4-door
Ramzfan is offline   Reply With Quote
Old 05-20-2013, 12:46 AM   #11
Member
 
Join Date: Jun 2012
Posts: 54
Freightliner RV chasis manual says climb at 2000. What goes up must come down. What is the proper downhill rpm? Does using an engine brake change the desired rpm range?
__________________
k9crazy5 is offline   Reply With Quote
Old 05-20-2013, 01:09 AM   #12
Senior Member
 
2 Stroker's Avatar
 
Join Date: Nov 2009
Location: Warren, Oregon
Posts: 1,723
Quote:
Originally Posted by Mr_D View Post
The "problem" with the torque and HP on any of the Silverleaf displays is that it's just programming in the unit. It doesn't actually measure anything. They just program in the power curve of the engine using factory info.
Got this info by asking on their forum sometime ago.
All I can go by is what I was told by the person that installed it and he is the one that designed it, Dale Kemper--Service Director.
2 stroker
__________________
2006 Country Coach Inspire 360 40ft Genoa Designer Series, Samsung 197 RR
Cat C9--STEEL & COPPER Bolt Together Radiator w/ updated rubber mounting
SilverLeaf 330 Magnum 2812 PSW 2011 Ford Edge Sport-Air Force One
2 Stroker is offline   Reply With Quote
Old 05-20-2013, 04:09 AM   #13
Senior Member
 
SteveSkinner's Avatar
 
Monaco Owners Club
Join Date: Jun 2011
Location: Montana
Posts: 807
Quote:
Originally Posted by Steve Ownby View Post

On long grades the accepted drill is to need the rpm close to the hp peak which is generally at the governed rpm. If your engine heat keeps climbing then down shift another gear and back off the throttle some.
This is the correct advice.
Torque maybe 1400 rpm and max Hp maybe 2000 rpm
Do not try and run at max torque but run at max hp.
Hopefully this means you have like 3/4 throttle 2000 rpm. Forget about everything else.
If its seriously steep you could be 2 nd gear at 25 mph or 4 th at 38 mph.
Nobody cares whether you are doing 25 or 38 mph but you need to care about keeping temps in the green and the above is the way to do it.
__________________
2005 Monaco Signature Castle 1V
2013 Subaru Outback Toad
SteveSkinner is offline   Reply With Quote
Old 05-20-2013, 05:08 AM   #14
Senior Member
 
wb7auk's Avatar
 
National RV Owners Club
Join Date: Feb 2012
Location: Spokane Valley, Wa
Posts: 1,987
TR,
You are dealing with two different issues here.
Best fuel mileage or best engine cooling.
Cat and Cummins agree the best fuel mileage is at max torque or a little above.
Max cooling is some where above that RPM at the cost of extra fuel.
Depending on the cooling system of your vehicle you will find a RPM and gear that
will keep your engine temp in the safe zone.
__________________

__________________
Art
1999 Trade Winds 7371 Cat 3126B w/current upgrades
1990 D 250 Dodge Ram Cummins Turbo
wb7auk is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
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


» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:22 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.