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Old 08-24-2020, 02:28 PM   #1
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new Ford 7.3 in Class C

Hi, we are looking to buy a 2021 Class C with the 7.3 eng. any throughts? It will be in a 30 to 33 foot unit, rated to tow 7500 lbs, BUT i know not to tow that much, and what about your real MPGs, with and with out towing?
Thanks for your help, take care...

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Old 08-24-2020, 05:07 PM   #2
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Too many problems with the 7.3 in other vehicles right now. I would not go near it for at least another year.
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Old 08-24-2020, 05:09 PM   #3
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Too many problems with the 7.3 in other vehicles right now. I would not go near it for at least another year.
I did a perfunctory search last week when someone said this.
I didn't in two or three minutes find anything about problems.

Do we have a link?

I'm not sure problems matter much if it's your only choice for a new purchase.
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Old 08-24-2020, 05:32 PM   #4
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Too many problems with the 7.3 in other vehicles right now. I would not go near it for at least another year.
What are they seeing?
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Old 08-24-2020, 05:48 PM   #5
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The mileage can't be much worse than the V10!! Depending on the transmission & gearing it may get better.
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Old 08-24-2020, 05:53 PM   #6
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I agree: I got as low as 5 mpg , and as high as 9 mpg with the 6.8.
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Old 08-24-2020, 06:28 PM   #7
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We have the 7.3 in our new Freedom Elite and so far no issues at all. Mileage out to WY and back was around 10.4 or so (using a/c) and cruising at 65 mph.
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Old 08-24-2020, 06:30 PM   #8
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The mileage can't be much worse than the V10!! Depending on the transmission & gearing it may get better.

Based on Tugboat911 looking for 30~33 foot Class C, that would make it an E-450; and Ford specs show the same 6R140 transmission and same 4.56 final gears. Originally Ford claimed some fuel economy improvement, but I seriously doubt itís significant enough to worry about.

The new 7.3L V8 engine does have higher compression ratio which should help, and it ďmayĒ be able to run a little leaner also (I donít know but itís possible), but other factors like driving speed will likely make a larger difference. Iíd bet it remains in the +/- 8 MPG range like so many large Class As.

I have not heard of any issues with new engine.


P.S. ó I assume Tugboat911 is looking at standard Class Cs and not Super Cs that are based on Ford F-550 (most of those are longer than 33-ft anyway). I havenít seen any yet but expect manufacturers may build gasoline F-550 or F-600 at some point in time.
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Old 08-24-2020, 06:37 PM   #9
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We have the 7.3 in our new Freedom Elite and so far no issues at all. Mileage out to WY and back was around 10.4 or so (using a/c) and cruising at 65 mph.

Thatís excellent.


Specs show itís on E-350 chassis, is that correct?

I ask because E-350 is available with 4.10 final gearing, which should help with fuel economy a little compared to same motorhome with 4.56 gears.
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Old 08-24-2020, 07:58 PM   #10
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Originally Posted by Johnandcarols View Post
We have the 7.3 in our new Freedom Elite and so far no issues at all. Mileage out to WY and back was around 10.4 or so (using a/c) and cruising at 65 mph.
We have not put too many miles on it yet but we are seeing 9.5mpg @ 60mph with gen and two acs on w/o towing.
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Old 08-24-2020, 08:14 PM   #11
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We have not put too many miles on it yet but we are seeing 9.5mpg @ 60mph with gen and two acs on w/o towing.

That also sounds better than the V10 for a large Class A.

Two A/Cs powered by larger generator can burn a lot of fuel.
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Old 08-24-2020, 10:53 PM   #12
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Plug and coil wires with no replacements in stock nationwide. Delivery dates of the end of September. I am a Ford fan but they really blew it on this roll out.

Check the Jayco forum and enjoy the reading.

https://www.jaycoowners.com/forums/f...ues-78912.html
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Old 08-25-2020, 12:07 AM   #13
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It was interesting reading that thread. It sounds like most posters agree the engine is great so far, except for the plug wires which are in short supply due to Covid manufacturing delays.

No doubt wire quality should have been better ó PERIOD. No excuse for defective wires.

However, if a person had to choose between a newer V8 engine that may need a few wires replaced, or go with a V10 engine over 20 years old in design which may be perfect for what it is but will remain the older V10 for ever, Iím not sure Iíd exclude the new V8 to avoid possible wire replacement.

I guess it comes down to whatís more important to each of us.
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Old 08-25-2020, 01:43 AM   #14
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It was interesting reading that thread. It sounds like most posters agree the engine is great so far, except for the plug wires which are in short supply due to Covid manufacturing delays.

No doubt wire quality should have been better ó PERIOD. No excuse for defective wires.

However, if a person had to choose between a newer V8 engine that may need a few wires replaced, or go with a V10 engine over 20 years old in design which may be perfect for what it is but will remain the older V10 for ever, Iím not sure Iíd exclude the new V8 to avoid possible wire replacement.

I guess it comes down to whatís more important to each of us.
No problem is someone is willing to take the risk of a motor home sitting idle for weeks while waiting for wires.

That V10 may be old in design but it is a proven workhorse.
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Old 08-25-2020, 02:50 AM   #15
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https://www.jaycoowners.com/forums/f...ine-78354.html

Also this thread.
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Old 08-25-2020, 11:37 AM   #16
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That V10 may be old in design but it is a proven workhorse.

Yes, the V10 is known for being pretty bulletproof, running reliably for many years and many miles. Time will tell if the new V8 is as durable and reliable.


My 2018 V10 has had a couple of peripheral issues. I just had a catalytic converter replaced after only 45K miles, which was surprising. It has also had the evaporative emissions purge valve replaced twice.
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Old 08-25-2020, 11:43 AM   #17
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There are some known issues with the V10:
  • Early ones were known to spit out sparkplugs
  • Many of the Triton engines also commonly break exhaust mainifold bolts

The V10 in our Axis is our 3rd V10. The first one was in an F250 and I traded it in on an F350. When I did, the F250 had 138,000 miles on it. The F350's V10 broke several exhaust manifold bolts after about 50,000 miles. When I traded that in on the Axis it had over 70,000 miles on it.
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Old 08-25-2020, 01:59 PM   #18
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The V-10 has a proven and admirable track record.
Let's hope that the new V-8 proves to be a worthy successor.
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Old 08-25-2020, 02:36 PM   #19
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Wow! Leaving an RV sit over plug wires. Is there something unique about them? I have plug wires stored in back bin. Some are made up and some are unfinished. I always keep more recent set removed from drag car because never know when new set has issues.
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Old 08-25-2020, 02:45 PM   #20
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No problem is someone is willing to take the risk of a motor home sitting idle for weeks while waiting for wires.

That V10 may be old in design but it is a proven workhorse.

Thatís a great analogy, as in a farm horse used to plow the fields. Strong and reliable, but not what youíd enjoy riding for pleasure.

Iím on second V10 and itís a few miles short of 204,000 miles, so Iím not complaining. However, as Iíve stated before in other threads, just because itís reliable doesnít mean a gasoline engine canít be improved significantly.

The problem I have with V10 has nothing to do with reliability. I donít like the noise level, the vibration of a 90-degree V10, or overall lack of refinement.

A large V8 has the potential to be better than V10, and I trust that Ford engineering wouldnít design and build an inferior engine as a replacement. Granted, they were driven (no pun intended) in large part to build a more cost effective engine, and they probably succeeded; not that thereís anything necessarily wrong with building a cheaper engine, particularly if accomplished through simplicity.

The new 7.3L V8 is inherently better balanced, itís smaller, lighter, has fewer moving parts, and was designed from ground up as a heavy-duty truck engine. Yeah, it may turn out to be less durable, but it may be even better and with fewer compromises.

The only real hesitation Iíd have buying a 7.3L V8 at this point is that it may be too large to maximize fuel economy when installed in smaller motorhomes. And thatís not a big fuel cost penalty anyway.
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