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

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class C 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 08-31-2022, 10:10 AM   #15
Senior Member
 
Alpine36's Avatar


 
Alpine Owners Club
Join Date: Oct 2019
Location: Hoodsport Wa
Posts: 3,116
Want better mileage from a vehicle designed like a cinder block?
Slow down to the engines sweet spot (rpm) usually about 60mph on the older rigs commonly equipped with 4:56 gears and no overdrive.
What's the hurry?
__________________
2000 Alpine 36 FDS #74058
04 Jeep Wrangler TJ
"On the road to find out..."
Alpine36 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 09-01-2022, 04:59 AM   #16
Senior Member
 
Winnebago Owners Club
Join Date: Aug 2019
Location: Meshoppen, PA
Posts: 1,997
Older 460 rig, water inject is a 70's gig.. blah blah..

Back to 460.. I have built them in many configurations. Motorhead back in the day..

1985ish.. basic low compression carbed workhorse..


Redo the carb if it is still good,, bump timing 2 - 4 degrees advance.. You can sort of desmog.. it is a toss up..
Next easiest is Exhaust.. either headers, that will add some extra pull and maybe 1 -2 mpg.. I have just after the y pipe, went with a 3" or 3.5" straight back with hi flow muffler, mid quiet style and dumped it out in front of the dual wheels. Less bends and shorter, flows best..
You can opt for a better intake and add a edelbrock intake and their or holleys sniper TB fueil injection with feed back system.. THESE WORK well, I have done a couple in the early version and I hear they are better now..

I had a 429 (baby 460) in a 26000 lb flat bed get 12-14mpg all day on the highway loaded to avg 21-24k gross.. But it was purpose built needed good fuel .. That build would be 15K plus today..

OH you can try a slightly taller tire,, if it has 225/75/16 try a 215/xx/16 or so, they are inch pluss taller and will drop a few RPM on highway


Still a large cube of dead air going down the road,,
I have done basics ( exhaust, timing, thermostat, tweeks) on my 1996 460..30 ft C lives in the 7mpg range at 70mph.. If I can keep it 60 and stay awake and avoid getting blown of the road.. I have seem 8-9 mpg..

Dont get better than that ..
sibe is offline   Reply With Quote
Old 09-01-2022, 09:08 AM   #17
Senior Member
 
Alpine36's Avatar


 
Alpine Owners Club
Join Date: Oct 2019
Location: Hoodsport Wa
Posts: 3,116
Agree with sibe, the best performance gain on a 460 is exhaust headers and a decent dual plane intake manifold. Had an old F250 4x4 with those improvements and it got 10mpg all day long with a 9' camper and 21' heavy deep v boat.
Again, at 55-60 mph. At 70 more like 7-8 mpg.
Now, ask me why Ford thought a 22 gallon fuel tank was ok with a 460?
__________________
2000 Alpine 36 FDS #74058
04 Jeep Wrangler TJ
"On the road to find out..."
Alpine36 is offline   Reply With Quote
Old 09-05-2022, 05:10 PM   #18
Junior Member
 
luckettg's Avatar
 
Join Date: Jul 2009
Location: Saint Joseph, MI
Posts: 2
Quote:
Originally Posted by Verdigo View Post
I haven't even driven this thing over a mile yet at one time. Needs new tires, and other repairs before hitting the road. I am expecting pretty bad fuel economy, which got me to thinking about water injection so I was wondering has anyone tried water injection to increase mpg? My Class C is an 85 Ford with a 460 engine, which of course is carbureted.
I did years ago on my parents Brougum(sp) using a plan from Mother Earth News in 1980. It was a carburetor on a big block. Mixed water and isopropyl alcohol in a jar then a fish tank aspirator on a tube, then hooked to a vacuum input on the carb. I drove that motorhome from Houston to Oxnard, getting about 8 mpg. Installed the water alcohol system and drove it back, getting 10 mpg. Haven’t used one since.
__________________
Greg
Michigan
luckettg is offline   Reply With Quote
Old 09-10-2022, 12:05 AM   #19
Senior Member
 
jackreno's Avatar
 
Join Date: Feb 2016
Posts: 858
Quote:
Originally Posted by Verdigo View Post
I haven't even driven this thing over a mile yet at one time. Needs new tires, and other repairs before hitting the road. I am expecting pretty bad fuel economy, which got me to thinking about water injection so I was wondering has anyone tried water injection to increase mpg? My Class C is an 85 Ford with a 460 engine, which of course is carbureted.
If you want better MPG with a older carb big block than check out Holly TBI fuel inject system, it replaces that old carb and also prevents vapor lock that happens with older carb autos and such because of the newer fuels.

The Holly TBI comes in 2-barrel and 4-barrel, 2-barrel will give you better mpg.

Click link to see the Holly TBI

https://youtu.be/rXUJPeCqWlQ
__________________
2021 Gulf Stream BT Cruiser 5240 on a E350 Super Duty, Godzilla V-8
jackreno is offline   Reply With Quote
Reply

Tags
water



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
Cummins 8.3 mechanical fuel injection verses electronic fuel injection. suzygirl2017 Country Coach Owners Forum 4 07-16-2018 04:47 PM
Has anyone tried Camp Club USA Chuck 1935 iRV2.com General Discussion 23 05-20-2010 02:39 PM
Has anyone tried to repair the Winegard AS-2300 control board? B.C. Technology: Internet, TV, Satellite, Cell Phones, etc. 4 03-01-2009 01:37 AM
Has anyone tried the LED bulbs for tow brake/turn lights? ctcamper Toads and Motorhome Related Towing 5 02-22-2008 04:17 AM
Has anyone tried the suction cup door holder? GG1 Winnebago Industries Owner's Forum 9 08-04-2007 02:24 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 10:45 PM.


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