Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×


Join Truck Conversion Today
Reply
 
LinkBack Thread Tools Search this Thread Display Modes
 
Old 12-04-2011, 03:22 PM   #1
Junior Member
 
Join Date: Dec 2011
Posts: 1
Default Mileage - Propane Injection?

I'm looking for anyone that has tried propane injection. We have Haulmark Garagehauler on a M2 Freightliner with a Cat C7. The power and milage is all over the place.
__________________

aseuffert is offline   Reply With Quote
Old 12-04-2011, 08:44 PM   #2
Senior Member
 
Join Date: Dec 2003
Location: Grand Forks BC Canada
Posts: 170
Default

When is the mileage the worst? The C7 isn't the biggest engine out there and you may just be overworking it, giving you the bad results.
For example, I got better fuel mileage pulling a heavy trailer with a 454 equipped dually crewcab then I do pulling a smaller trailer with my new 5.3L 2010 Silverado.
This is why I put a C15 in my Freightliner Century, that is soon getting converted to a motorhome.
__________________

Gordy is offline   Reply With Quote
Old 12-05-2011, 06:42 PM   #3
Senior Member
 
#90-GTSC's Avatar
 
Join Date: Nov 2010
Location: Grafton
Posts: 285
Default

What is the nomenclature? What is the differnce between a C7 and a C15? 7 liters vs 15 liters?

Thanks!

Dick
__________________
Started looking for 379 Peterbilt TC, 24' to 30' box, bumper pull--but ended up w/1999 Liberty Coach conversion of 45' Prevost XLV bus. 1,000sf heated/AC'd race shop w/dump station, 50amp shore pwr where bus parks, 3 NASCAR/ARCA race cars & 26' Bravo trailer.
#90-GTSC is offline   Reply With Quote
Old 12-05-2011, 11:12 PM   #4
Senior Member
 
Join Date: Dec 2003
Location: Grand Forks BC Canada
Posts: 170
Default

The C7 is 7.2 liter or 441 cu in
The C15 is 15.2 liter or 928 cu in
My C15 is set to 475hp 1650 ft lb torque. A 300 hp C7 has max 860 ft lbs torque.
Notice that even though hp is up approx 50%, the torque is double. Torque takes you up the hill.
My Century Freightliner @55,000 lbs total weight pulls a 8.5% grade easily at 60mph and didn't overheat in the summer months.
Fuel mileage is around 8.5 to 9mpg on the highway which I find acceptable for this much engine. Some say mileage will go up with a few more miles on it but to date it has 27000.
May look at "chipping it" down the road.
Gordy is offline   Reply With Quote
Reply

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 On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 03:51 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
×