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Old 08-01-2019, 09:41 PM   #1
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Specs out on new Ford 7.3 gas engine

https://www.yahoo.com/news/ford-7-3-...82400291.html#
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Old 08-02-2019, 05:40 AM   #2
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Ford is referring to its new gasoline V-8, a.k.a. "Godzilla," as "best in class"; it's rated for 430 horsepower at 5500 rpm and 475 lb-ft of torque at 4000 rpm.


2017 V-10 : HP 320 @ 4250, Torque 460 @ 3000.
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Old 08-02-2019, 08:48 AM   #3
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I hope it is quiet at those RPMs...
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Old 08-02-2019, 09:08 AM   #4
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Actually, the important part of the article as it relates to motor homes is the mention of a detuned engine resulting in only 350 hp. Not much more than the v10.

“A slightly less powerful version of the new 7.3, rated at 350 horsepower at 3900 rpm and 468 lb-ft of torque at 3900 rpm, will be standard on the F-450 chassis cab, the F-550, the new F-600, F-650 and F-750 Medium Duty trucks, and F-53 and F-59 stripped-chassis models.”
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Old 08-02-2019, 09:20 AM   #5
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Here is a video from Autoline Daily on the new engine. It starts at the 2 minute mark...

https://www.youtube.com/watch?time_c...&v=H2jb_MBSerQ
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Old 08-02-2019, 09:24 AM   #6
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Actually, the important part of the article as it relates to motor homes is the mention of a detuned engine resulting in only 350 hp. Not much more than the v10.

“A slightly less powerful version of the new 7.3, rated at 350 horsepower at 3900 rpm and 468 lb-ft of torque at 3900 rpm, will be standard on the F-450 chassis cab, the F-550, the new F-600, F-650 and F-750 Medium Duty trucks, and F-53 and F-59 stripped-chassis models.”
According to this chart from Ford the detuned engine is only for the E series and as an option at that.
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Old 08-02-2019, 10:26 AM   #7
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For a MH, my understanding is that it's all about torque. Why would that huge increase in HP for the Godzilla result in a torque increase of only 15 ft. lbs? RPM's/powerband? My questions probably reflect my rudimentary understanding of engine parameters.
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Old 08-02-2019, 11:51 AM   #8
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For a MH, my understanding is that it's all about torque. Why would that huge increase in HP for the Godzilla result in a torque increase of only 15 ft. lbs? RPM's/powerband? My questions probably reflect my rudimentary understanding of engine parameters.
Horsepower and gearing does the work. A class A gasser on a 20 to 26K chassis is going to have an excellent to outstanding power to weight ratio. A class A on a 16 or 18K chassis is going to be an RV hot rod. I think these things are going to leave many DPs in the dust.
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Old 08-02-2019, 12:31 PM   #9
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What has my attention is the nearly flat torque line. Having a power train that has 400+ lbs of torque at 1500 RPM is going to be interesting to drive. I suspect we should have a set up that will hold speed with cruise control set over the moderate inclines that in the past with the V10 cause the down shift and 3500+ RPM. Heavy climbs should be much easier and with a bit more overall cylinder capacity we might also have a bit more engine braking for the descent.

The spec I waiting on is the final axle ratio for the chassis. Knowing the 6 speed gear ratios, wheel diameter and axle ratio you can compute engine RPM for any speed. I'm hoping for something around 1800 RPM for 65 MPH which might make for a modest gain in fuel economy and potentially a quieter ride.

As an added bonus the dog house should get a bit smaller.
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Old 08-02-2019, 12:50 PM   #10
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I smell a large motorhome price increase coming.
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Old 08-02-2019, 01:39 PM   #11
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Quote:
Originally Posted by Sandy Swede View Post
For a MH, my understanding is that it's all about torque. Why would that huge increase in HP for the Godzilla result in a torque increase of only 15 ft. lbs? RPM's/powerband? My questions probably reflect my rudimentary understanding of engine parameters.
They do it with RPM. HP goes up as the RPM goes up with no torque change. HP=torque x RPM ÷ 5252. So if you can increase RPM a ton with a small torque increase you can get a big bump in HP.

This is similar to the Cat C7 engines that are 300/330/350 HP but all have the same 864lb/ft torque (IIRC). I think it's just a small RPM increase between the engine models. That's only a 300RPM diff between the 300hp and 350hp models.

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