Author Topic: 46RH (A518) Conversion project  (Read 16393 times)

Offline legomybago

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  • Posts: 1149
  • Member since: 2013
  • I own: a Motor Home
  • Year: 1975
  • Make: FMC
  • Model: 2900R
  • Engine: 440
Re: 46RH (A518) Conversion project
« Reply #275 on: September 10, 2018, 09:19 AM »
(2.Noise.  One of the huge benefits of doing some of my mods was to reduce cabin noise while driving.  It is pretty darn quiet now.  Stuffing an older 12 valve in there would be quite a bit louder, and I am liking the relaxed feeling that the quiet cab gives me now).

This is one example of how sweet an FMC coach is, engine is in the back! Nice and quiet up front......BUT with stock gearing, my 440 is screaming 3,400 rpm's @60 mph....AND very thirsty :'(
Never get crap happy with a slap happy pappy

Online Sasquatch

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  • Posts: 270
  • Member since: 2010
  • Year: 1976
  • Make: Executive
  • Chassis: Dodge M-500
  • Engine: 440-3
Re: 46RH (A518) Conversion project
« Reply #276 on: September 10, 2018, 03:12 PM »
Which is why I undertook this challenge...

Online Sasquatch

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  • Year: 1976
  • Make: Executive
  • Chassis: Dodge M-500
  • Engine: 440-3
Re: 46RH (A518) Conversion project
« Reply #277 on: March 11, 2019, 07:33 AM »
I am gearing up for another trip, hopefully this time all the problems are sorted and will have real numbers to report.  I am leaving in 2 weeks to travel from Boise to Las Vegas for spring break.  Other things I found after my last disaster trip to Arizona last year was that I had a shot rotor in the distributor, all my spark plug wires were arcing, and the plugs more worn than I would have thought for how many miles were on them.  I also replaced two failed engine mounts.  Now all that is new, the engine is purring nice and smooth.


The transmission worked perfectly on the 90 mile or so test run after finding and repairing the warped valve body.  Shifted better than it ever did since starting this project.  So, combined with the engine repairs, I am hoping for a smooth run and some good fuel mileage numbers.


Regarding mileage, I am going to have to learn when to shift out of OD on hills.  During my test run I pulled a couple of moderate grades, just left the cruise control on at 65 and let them pull in OD.  It pulled the hills just fine only loosing a couple of mph.  But, I am sure that it was using more fuel than it would have been had I downshifted to 3rd and let the motor rev.  I also wanted to beat on the OD to see what temperatures it would run at.  Now it was a cooler day, in the 50's/60's if I remember right, but the hot side temps never even hit 200 on the hills and stayed in the 150-160 range on the flats.  So this is perfect. 


I am going to keep my computer hooked up on the trip so I can watch the fuel usage from the fuel injection system.  Watching the gallons per hour (GPH) reading under different driving situations I will be able to quickly figure out optimal shift points for economy.


Keep in mind, all the problems I had on this transmission were due to MY mistake rebuilding it the very first time and the damage that occurred to the valve body that was very hard to catch, which caused all the future failures.  Anyone else wanting to do an OD swap would probably not run into these issues if you have someone QUALIFIED to rebuild your transmission.  Have it rebuilt, and then use a bell housing adapter kit or plate and you will be off and running.  How I did mine with welding on a 727 bell housing and making the rebuild mistake turned a mole hill into a mountain of problems that never should have happened.


When I start my trip I will start a thread in the travels section and report how well the transmission is doing and how the trip went.  If anyone is located in Las Vegas and wants to get together to swap stories, shoot me a PM.

Online Rickf1985

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  • Posts: 5087
  • Member since: 2013
  • I own: a Motor Home
  • Year: 1989
  • Make: Winnebago
  • Model: Chieftain
  • Chassis: Chevy
  • Engine: 454
Re: 46RH (A518) Conversion project
« Reply #278 on: March 11, 2019, 10:12 AM »
Best of luck and I am really looking forward to your report on the mileage. I have tons of data on big block Chevy engines and mileage but when people ask me about big block Dodges all I can offer is the Chevy info and tell them it should be similar. I am curious to see if I am right.

Online Sasquatch

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  • Year: 1976
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  • Chassis: Dodge M-500
  • Engine: 440-3
Re: 46RH (A518) Conversion project
« Reply #279 on: March 11, 2019, 10:15 PM »
Best of luck and I am really looking forward to your report on the mileage. I have tons of data on big block Chevy engines and mileage but when people ask me about big block Dodges all I can offer is the Chevy info and tell them it should be similar. I am curious to see if I am right.

Before the overdrive install I would average about 7 mpg.  Sometimes into the 8's, sometimes as low as 5.5 if I am beating on her in the mountains or high winds.  I am not the slowest driver.  She is most happy between 65-70 on the freeway and 60-65 on secondary roads.  She has plenty of umph to carry those speeds and all the suspension upgrades as well.  I posted somewhere all the 440 mods I have done and what worked and what was a waste of time.  But long story short, she runs infinitely better than she did when she was completely stock.  The three biggest upgrades were 1) Fuel injection, 2) proper cam for torque/efficiency, 3) Headers/exhaust.

Online Rickf1985

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  • I own: a Motor Home
  • Year: 1989
  • Make: Winnebago
  • Model: Chieftain
  • Chassis: Chevy
  • Engine: 454
Re: 46RH (A518) Conversion project
« Reply #280 on: March 12, 2019, 09:30 AM »
I remember your mods and they were pretty much the same specs that I use for the Chevy engines.

Online Sasquatch

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  • Posts: 270
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  • Year: 1976
  • Make: Executive
  • Chassis: Dodge M-500
  • Engine: 440-3
Re: 46RH (A518) Conversion project
« Reply #281 on: Yesterday at 10:33 AM »
This is my last posting here unless someone has questions.  I am leaving Friday, March 22nd for Las Vegas.  This is it, to see if everything I did is sorted and working well.  Prayers happily accepted.  :)ThmbUp


Took it down to get propane yesterday and it drove as she should.  Overdrive kicked in and out just fine, my hopes are rising.  I will start a thread in the travel section to give a trip report as she unfolds.

Online LJ-TJ

  • 14 year member
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  • Year: 1975
  • Make: Winnebago
  • Model: D21
  • Chassis: Dodge
  • Engine: 440-3
Re: 46RH (A518) Conversion project
« Reply #282 on: Yesterday at 10:41 AM »
Holy Crap! Don't leave us blowing in the wind. You can lay over in Walmart parking lots and use their free wyfi or MacDonalds or ???? Geeeeezzzzzz. Now yeah got us following along we got to know how the trips going. D:oH! i?? :)rotflmao :)rotflmao :)rotflmao

 

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