Community Forums

tstyles · 03-01-2022, 12:48 AM

Killing time on the internet and noticed the 2022 F-53 specs for the V8 have the HP listed as 335 instead of 350. Wonder what happened?

2021: 350 hp @ 3,900 rpm ; Torque (lb.-ft. @rpm), 468 lb-ft @ 3,900 rpm

2022: 335 hp @ 3,750 rpm ; Torque (lb.-ft. @rpm), 468 lb-ft @ 3,750 rpm

Mike8253 · 03-01-2022, 05:19 AM

Quote:

Originally Posted by tstyles

Killing time on the internet and noticed the 2022 F-53 specs for the V8 have the HP listed as 335 instead of 350. Wonder what happened?

2021: 350 hp @ 3,900 rpm ; Torque (lb.-ft. @rpm), 468 lb-ft @ 3,900 rpm

2022: 335 hp @ 3,750 rpm ; Torque (lb.-ft. @rpm), 468 lb-ft @ 3,750 rpm

Same motor, 335 HP no. set at 3750 RPM vs. 350 set at 3900 RPM. Could be an EPA certification change or similar.

sportcoupe · 03-01-2022, 09:49 AM

Typo on the Ford page.

2022 Ford VIN Guide still says 350 HP, 468 TQ.

https://www.fleet.ford.com/content/d..._VIN_Guide.pdf

.

tstyles · 03-01-2022, 10:59 AM

Quote:

Originally Posted by sportcoupe

Typo on the Ford page.

2022 Ford VIN Guide still says 350 HP, 468 TQ.

https://www.fleet.ford.com/content/d..._VIN_Guide.pdf

.

Hard to say. The new webpage clearly calls out the horsepower rating at the lower rpm. I would suggest the webpage would be more current than a static pdf document. Those would be the last things that would get updated.

https://www.ford.com/commercial-truc...f53-motorhome/

GypsyR · 03-01-2022, 11:13 AM

Looks like a minor cam timing change to me, for whatever reason. Probably some very slight change in mileage or pollution controls. In any case, making the same peak torque at a slightly lower RPM sounds great to me. IMHO, if you are looking at horsepower numbers when there are torque numbers available to see then you're doing it wrong. At least as far as honking great heavy motorhomes are concerned.

Sweetbriar · 03-01-2022, 11:32 AM

What happened? The RPM is different. As long as Ford keeps shifting the reference point that they choose to make the calculation from the number is going keep shifting. They did that same for the V10 over the years it was the prime mover. Besides you'll loose that much just by using a heavier weight oil or in the first 1000' of the climb up I70 west of Denver.

Rvlegaleagle · 03-08-2022, 09:45 AM

Does the new 2022 chassis address any of the issues Ford has with the 2020-2021 models? Thanks.

sportcoupe · 03-13-2022, 12:38 PM

Quote:

Originally Posted by tstyles

Hard to say. The new webpage clearly calls out the horsepower rating at the lower rpm. I would suggest the webpage would be more current than a static pdf document. Those would be the last things that would get updated.

https://www.ford.com/commercial-truc...f53-motorhome/

And the same engine is shown as 325 hp in the E-Series stripped chassis. Same engine VIN code.

I say a different marketing web page group is making these pages.

https://www.ford.com/commercial-truc...dels/e350-drw/

.

jharrell · 03-14-2022, 07:13 AM

Quote:

Originally Posted by sportcoupe

And the same engine is shown as 325 hp in the E-Series stripped chassis. Same engine VIN code.

300 horsepower and has been that way in the E-series since switchover to V8, its called the "economy" tune: https://fordauthority.com/2020/05/wh...ies-exclusive/

Edit: I see that you are referring to the specs further down, looks like they changed the "premium" tune to 325hp in the E-series, or its a typo and perhaps its 335hp as it looks to be on the F53.

If the HP in fact went down, it is most likely to do with emissions just like it did when the V10 dropped from 365hp to 320hp in 2016. This is not just a different way of measuring, the engine will not produce more power at a higher rpm because the rpm is limited. My V10 will not rev past 4200 under its own power while the 365hp version will rev up above 5000.

The V8 can produce 430hp if it is allowed to rev up as it is in the F series PU trucks but was limited to 350hp in the F53 due to chassis versus dyno certification of emissions, it could also be somewhat related to commercial longevity and warranty, but based on what I have gathered mostly emissions.

This was some info sent out by ford a while back explaining the difference in certifications: https://media.assets.sincrod.com/tea...tification.pdf

Shadow5501 · 03-14-2022, 07:59 AM

Quote:

Originally Posted by jharrell

This was some info sent out by ford a while back explaining the difference in certifications: https://media.assets.sincrod.com/tea...tification.pdf

Good Stuff, that answers some basic questions.

For those that don’t know, horsepower is calculated from torque and RPM. The formula is (HP x RPM)/5252. If you run the numbers, 350HP @ 3900 RPM means the engine is producing 468lb-ft at that RPM. Similarly, 335HP @ 3750RPM means the engine is also producing 468lb-ft at that RPM. No real surprise on a modern engine. It would appear that some changes to the dyno certification process have caused Ford to start closing the electronic throttle earlier, so the peak HP (torque x RPM) combination has moved down to 3750.

jharrell · 03-14-2022, 08:45 AM

Quote:

Originally Posted by Shadow5501

It would appear that some changes to the dyno certification process have caused Ford to start closing the electronic throttle earlier, so the peak HP (torque x RPM) combination has moved down to 3750.

If you look at provided dyno curves, the HP torque match up with the RPM limits pretty well. They may have changed some other parameters but it mostly seems to be an RPM limit that keeps going down, although 3750 rpm looks to be the same for both the economy (300hp) and premium (325hp):