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I have a 1987 shasta motorhome Ford E350,with the stock Motorcraft(Holly) double pump 4bbl carb.I am considering replacing the carb with an Edelbrock performer 750cfm unit.I have heard through some sources that I should gain a few miles per gallon and some performance.Im not expecting any miriacles,but 9 or 10 MPG would be nice.Has anyone out there made this upgrade and what were your results. Any information is appreciated
Hello Andy
replacing a carb---$450-$500
No matter what gasoline motorhome you have, you will not improve 2-3 mpg---they weigh to much,geared low so you have power,and we all add even more to them.Im on my 4th one---
and spending tons of money just wont repay in mpg's I have never gotten better than 8mpg.stay at 55-60 mph---and you will get the best mileage---
rich in Va.
Ford 460 Holly 4 barrel to eldebrock 4 barrel 750 cfm carb.. It will not get any better mileage on a heavy motor home.
Our 24,ooo lb. 36' Grand Villa pusher with a Ford 460 and Allison 4 sp transmission gets from 4.5 mpg to 5.5 mpg. Averages just barely 5 mpg. Sometimes a mite worse and somtimes a mite better. Does not matter if its the Holly or Eldebrock. It is on its third ring and pinion gear set. It is now at 5.25 to 1 from 5.375 to 1, with 9R x 22.5 tires. Only thing that changed was less poop on the hills and lower RPM at speed. The only reason we went to the lower ratio was because we would have had to waite 2 weeks to get the right gear set while broke down on the road. It did not change the miles per gallon one whit.
I prefer the Edlebrock for performance. However it is just the seat of my pants opinion. No test were conducted. The Holly needed rebuilt, we opted for the Eldebrock. Fuel milage still just as bad.
Just an FYI. I have a 1990 26' Jayco F350 460 cid, with FI, and the AOD tranny. @ 55 MPH with cruise on I get anywhere from 9mpg to almost 11mpg. All tuned up with new tires. Currently I am getting a front end aligned, new shocks. Hoping it will squeeze out a little more, maybe 11mpg. I once took my fathers class A 31' (454 cid) out west and got almost 13 MPG on one tank full. A well tuned machine and 55mph is the best answer. Oh, and have lots of fun! I plan on it. Oh, and one more thing, I only drive my RV several weeks a year, good thing I don't have to drive it for a living or I would go broke. -Rick-
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