We have talked about the larger valves up in the 2017 forum for awhile now. Here is a link to a quick google search:
The 2017 Ford Super Duty - Will History Repeat Itself?
I and others think that it took different cams to achieve the max torque down at 3800 but at this point it is still speculation. as far as I know.

 

That was an old response from the "ask an engineer" section. Ford has released the new numbers now. I also have read Ford was going for "significant" fuel mileage gains. I figure the new 6R100 will be the biggest factor of that.

 

Thanks for the link. Interesting to read a little blurb about it there. More info as it comes available will be good. It was my understanding that the 'space' available for intake valving was very limited on these engines. So I'd love to hear/see what they did?

 

My guess would be a little cam change and different tuning. When I used to built my motors for pulling I would install a longer duration cam to bring the torque curve down.

Denny

 

Well, if max torque comes in at a lower RPM (and a lower forward speed) it seems to this layman that fuel economy would be better. Of course it seems that the horsepower specs would play into this, but I have not been able to wrap my head around how Tq, HP, speed and wind resistance play together in these trucks. Trial and error is the only way I know of to know for sure, but it would be nice to have an idea as to how the new specs (if Ford will give them to us already ) will affect towing performance as well as towing / non-towing fuel economy.

 

I thought it was the opposite ie shorter duration = lower powerband. Long duration lumpy =move power band up increase HP but get a soggy bottom. But sound bada$$

 

The Crane RV cams I bought were called long duration but I never looked at the grind all that close. They sure did wake up a Ford 400 and 460 but also like their fuel.

Denny

 

You did those motors quite a favor and I'm sure they thanked you for it.....that smog era brings back memories of factory timing sets being retarded -4 degrees as well, something else a good cam and timing set remedied.

 

What smog stuff is that the stuff that ended up on the shop floor and then the round file.

Denny

 

This is all good news for the 6.2 . I believe that Ford is only going to make this engine even better over time. Its a solid reliable unit , a good platform to invest in over time, especially after the kick in the face that Navistar regurgitated on ford buyers after the 7.3

 

Horsepower:
385 @ 5500 rpm (2011-16 6.2L V8 gas engine)
385 @ ???? rpm (2017 6.2L V8 gas engine)
Torque:
405 @ 4500 rpm (2011-16 6.2L V8 gas engine)
430 @ 3800 rpm (2017 6.2L V8 gas engine)

I had made up my mind to go with the 4.30 gears for the extra umph for those long, steep mountain grades while towing. I am not very knowledgeable on the whys and wherefores of these things, but the 2017 6.2L should pull better under load AND at a lower rpm than before. However, the higher torque at a lower rpm has me scratching my head over how the towing performance of the 2017 6.2L will feel over the previous model. I suspect that the 4.30 gears will be a valid choice for my 8500 lb. trailer for the increased towing performance I want, but might the 3.73 gears now be reasonable and give better fuel economy than previously? So many unknowns at this early date.

Comparing the 11-16/17 6.2L Tq/HP curves might provide insight as well.

 

Get the 4.30 gear !!!

 

For 2017:
385 at 5750 and the 430 at 3800.
2017 Ford Super Duty F-250, F-350 review with price, torque, towing and horsepower

It is likely I will have my new 250 around the end of the month. (1st SD to my dealer). Rumor in the 2017 forum is the OK to ship is tentatively 8/21. I will give as much info as possible when I can.

 

I'm sure it will, mostly due to the new F250 tranny. The same will always hold true for the NA gas motors, the lower gears will be better in town and towing situations. For any working and towing needs as mine, I would go with the 4.30's all day.

 

Thanks for the link!

Horsepower:
385 @ 5500 rpm (2011-16 6.2L V8 gas engine)
385 @ 5750 rpm (2017 6.2L V8 gas engine)
Torque:
405 @ 4500 rpm (2011-16 6.2L V8 gas engine)
430 @ 3800 rpm (2017 6.2L V8 gas engine)

The extra torque at a lower rpm will be nice. But, if it is true that "torque gets you going and horsepower keeps you going," will this mean that the 6.2L will have to turn more rpm (5750 rpm for 2017 vs. 5500 rpm for 2011-16) to maintain forward speed under load? If so, it DOES appear that the 4.30 gears (vs. 3.73 ) is still my choice for towing under load on mountain inclines with a 2017 6.2L! Of course, the new TorqShift-G transmission in the F-250 should probably be considered in all of this somehow.

Perhaps someone more knowledgeable than myself on engine power specs vs. towing performance can shed some light on this.