RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > POWER TRAIN GARAGE FORUMS > Cummins Engines
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 11-27-2020, 04:54 PM   #1
Junior Member
 
Join Date: Nov 2020
Posts: 8
Tuning up 250HP Cummins

I am going to call about a 1997 Monaco Baron II that is 34'.
Owner lists it as having 250HP Cummins. NADA say it came as 300HP or 325HP.
If it is only 250HP how easy is it to get to 300? I need to tow my Jeep.
How can I tell for sure what he has?

I want to know more before I call so I can ask the correct questions.
Thanks.
garage man 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 11-27-2020, 06:49 PM   #2
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 21,710
Ok for that vintage of coach ,a 250 HP Cummins could be a 5.9 L engine and the higher HP could be an 8.1 or 8.3L so you'll need more info on the engine size .

Also not all coaches will be equipped with a transmission that will handle a higher HP engine . You'd want to know the coach has an Allison 3000 ( 3060MH ) six speed, before proceeding.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 11-27-2020, 06:53 PM   #3
Senior Member
 
Join Date: Oct 2014
Posts: 1,509
Ask for the engine serial number and give Cummins a call.


Cummins 800-286-6467


If 8.3 (C engine) it will have a LOT more torque than the 5.9 (B engine) and would have the Allison 6 speed 3000 series transmission (a good thing).
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
wolfe10 is offline   Reply With Quote
Old 11-27-2020, 06:53 PM   #4
Senior Member
 
153stars's Avatar
 
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 2,204
250hp in a 97 Dynasty , I dont think thats right for an 8.3
__________________
95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
153stars is offline   Reply With Quote
Old 11-27-2020, 09:46 PM   #5
Junior Member
 
Join Date: Nov 2020
Posts: 8
It says it is on a Roadmaster chassis with airbag suspension and it does not state what transmission. Thanks for all the pointers. I will get more info when I call.
garage man is offline   Reply With Quote
Old 11-28-2020, 09:50 PM   #6
Senior Member
 
153stars's Avatar
 
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 2,204
I didn't look up specs again but listed was 300 or 325hp 8.3 will have 3060 trans that's good for 400-450 hp but limited to 1250lbs torque. I don't think 5.9 was available. If 300hp the power to weight and low end torque is good you may be able to bump that up even. If your interested and good deal go see it.
__________________
95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
153stars is offline   Reply With Quote
Old 11-30-2020, 09:59 PM   #7
Senior Member
 
vito.a's Avatar
 
Monaco Owners Club
Join Date: Oct 2009
Location: Tucson, AZ
Posts: 4,644
A 1997 Monaco Dynasty should have a Cummins C8.3L mechanical engine and an Allison MD3060 6 speed transmission. The mechanical engines are pretty easy to turn up by rotating the fuel plate. You just need to be careful not to exceed the cooling system capability.
Depending on how heavy you load the coach and how heavy your Jeep is it should tow it. It will be more difficult in the western US in the summer heat.
__________________
97 Monaco Windsor- Sold
07 Monaco Executive McKinley- Sold
04 Monaco Signature Chateau IV
vito.a is offline   Reply With Quote
Old 11-30-2020, 10:16 PM   #8
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 21,373
The 1997 Monaco Dynasty has a C8.3 300 HP(12 valve) Cummins engine. the 1998 has an ISC 8.3 330 HP(24 valve) engine.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
Ray,IN is offline   Reply With Quote
Old 12-01-2020, 09:46 PM   #9
Junior Member
 
Join Date: Nov 2020
Posts: 8
I am always amazed at the amount of information out there if one just asks.
Thanks.
garage man is offline   Reply With Quote
Old 12-02-2020, 10:27 PM   #10
Senior Member
 
Join Date: Feb 2018
Posts: 245
A 34' motorhome with an 8.3 will haul a jeep without breaking a sweat.


If you adjust the pump for power, you will want to make sure you install a pyrometer first.

It most likely has the 12 valve 8.3C and the following are modifications/ adjustments you would potentially want to do:



1. Install boost and pyrometer gauges. This is mandatory before anything else!



2. Adjust fuel plate and AFC cover forward to allow more fueling. Modify or install a modified/after market fuel plate if desired.



3. Adjust star wheel which allows fueling to occur earlier (at a lower boost).



4. Install a 3k governor spring kit. Stock springs start pulling fuel pretty early (2200rpm or so), and this makes a big difference in drivability.



5. Install an adjustable waste gate and set it to open at 30psi.



6. Install a larger diameter exhaust and/or free flowing resonator. The stock mufflers are restrictive and heavy. The exhaust noise is not appreciably increased. It may help power, but the biggest reason is to help lower EGT's




7. Pressure test turbo piping to identify and eliminate leaks. You are likely to find several. Each leak is wasted power.



8. Inspect the airfilter and replace if necessary or in doubt of the age. Also inspect all connections for holes or leaks from housing to the turbo.
SlowJoe is offline   Reply With Quote
Reply

Tags
cummins



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


Similar Threads
Thread Thread Starter Forum Replies Last Post
96 8.3 250hp tach not working tony326 Cummins Engines 16 03-13-2017 09:44 PM
Torque determination on a C8.3 250hp engine? fighterpilot Cummins Engines 11 04-26-2013 08:42 AM
Is 250HP in a 34 footer enough? fighterpilot Monaco Owner's Forum 18 04-23-2013 04:04 PM
Diesel tuning for a Monaco Diplomat Cummins evo124 Cummins Engines 10 03-11-2011 07:33 PM
CB tuning FrankieJ Winnebago Industries Owner's Forum 14 03-25-2005 03:24 AM


All times are GMT -6. The time now is 08:39 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.