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


Reply
 
Thread Tools Display Modes
Old 11-25-2021, 12:11 PM   #1
Senior Member
 
Join Date: Jan 2018
Posts: 176
Detroit DD8 vs Cummins L9

Possibly addressed before but what advantages or disadvantages to either engine. Problems, quirks, etc. Does the DD have the DEF head issues? Availability of servicing? Drivability and fuel mileage? On the Force the Dynamax site says Cummins, dealer stop only. In today's market is there "dealer stock"? Question is also why? Why have 2 similar performance engines in the same coach?
__________________
2022 Renegade Valencia 35MB
2020 Ram 1500 Laramie toad
2019 Harley Davidson FLHCS

2012 Prime Time Crusader 355BHQ
chunker21 is offline   Reply With Quote
Old 11-25-2021, 01:11 PM   #2
Member
 
Join Date: Jun 2021
Posts: 52
All moving forward will be Detroit (all under same umbrella now) half 21s Cummins second half 21s Detroit 22 plus all Detroit
Dealer stock and a few 21s still got the Cummins
XLs still get the Cummins
rcraighughes1 is offline   Reply With Quote
Old 11-25-2021, 02:42 PM   #3
Senior Member
 
Join Date: Jan 2018
Posts: 176
Quote:
Originally Posted by rcraighughes1 View Post
All moving forward will be Detroit (all under same umbrella now) half 21s Cummins second half 21s Detroit 22 plus all Detroit
Dealer stock and a few 21s still got the Cummins
XLs still get the Cummins
Thanks I did another search of the topic and got much of what you said. Since lately everything is fluid and subject to change I didn't know how what was the current party line. From what I read there seems to be a bit of advantage to DD for RV use especially since few if any RVs will ever achieve the mileage where rebuild is necessary. I wonder if there are any real "dealer stock" RVs around?
__________________
2022 Renegade Valencia 35MB
2020 Ram 1500 Laramie toad
2019 Harley Davidson FLHCS

2012 Prime Time Crusader 355BHQ
chunker21 is offline   Reply With Quote
Old 11-25-2021, 04:37 PM   #4
Member
 
Join Date: Aug 2021
Posts: 76
https://www.truckinginfo.com/1013725...ion-to-cummins


"The new partnership will mean Daimler’s Detriot DD5 and DD8 medium-duty engines, introduced in 2016 and 2018, respectively, will also be phased out."
1HasBeen is offline   Reply With Quote
Old 11-25-2021, 06:03 PM   #5
Senior Member
 
CyberShanks's Avatar
 
Join Date: May 2014
Location: Top of a hill (in Iowa) surrounded by corn.
Posts: 287
Quote:
Originally Posted by rcraighughes1 View Post
All moving forward will be Detroit (all under same umbrella now) half 21s Cummins second half 21s Detroit 22 plus all Detroit
Dealer stock and a few 21s still got the Cummins
XLs still get the Cummins

^ is why we went XL. Cummins fan here, and now that I've driven our new XL, it has some amazing power.


Jim
__________________
2021 Dynamax Dynaquest XL 3400KD
2021 Aluma 8220H Tilt flatbed to carry:
2012 Jeep JKU Rubicon or 2001 Jeep TJ
CyberShanks is online now   Reply With Quote
Old 11-26-2021, 04:39 PM   #6
Senior Member
 
Invisibleman's Avatar
 
Join Date: Jul 2020
Location: Phoenix
Posts: 606
I have a 21 Force with the Detroit DD8. I did a lot of research on this in advance, but as a new engine for this application I had little but data sheets to go by. Ultimately it didn't matter as the Force and DX3 both were being shipped with Detroit DD8. I my opinion, its likely not much difference in the Detroit vs Cummins. They are similar, albeit the DD8 being around a 7% reduction in torque. Now with 10,000 miles of seat time under my belt, I would likely have done it differently, $$ considerations aside. For me the DD8 is not enough engine. That's just my opinion. Here's a link on another post here about the DD8 performance/fuel economy. As can be seen therein, each to his own. The opinions will vary, often widely.

https://www.forestriverforums.com/fo...cy-242801.html

If you can afford it, get the XL, if for nothing else the larger engine. You wont regret it.
__________________

2021 Force 37TS (Detroit DD8)
2021 Jeep Grand Cherokee Trailhawk
2020 Isata-5 36DS (traded in)
Invisibleman is offline   Reply With Quote
Old 11-27-2021, 10:02 AM   #7
Senior Member
 
CyberShanks's Avatar
 
Join Date: May 2014
Location: Top of a hill (in Iowa) surrounded by corn.
Posts: 287
Very sorry to hear that, and I know that the 34kd is a few foot shorter than your 37ts, but I can confirm the XL does have a nice level of power. Really looking forward to spring when I have 12-13k lbs behind it (still trying to put our storage shed back together).


Jim
__________________
2021 Dynamax Dynaquest XL 3400KD
2021 Aluma 8220H Tilt flatbed to carry:
2012 Jeep JKU Rubicon or 2001 Jeep TJ
CyberShanks is online now   Reply With Quote
Reply

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

Disclaimer:

This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.



All times are GMT -5. The time now is 07:10 PM.