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Open Roads Forum  >  Class C Motorhomes  >  Class C

 > "Godzilla" Ford V 8

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Lumpty

Greater Gotham City

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Posted: 09/05/22 05:16am Link  |  Quote  |  Print  |  Notify Moderator

If someone has only ever twisted their Ford V10 to 3500rpm max, that’s one slow ride. The one in my E450 cutaway in normal driving will generally upshift at 4k. Any hill will drop it from 5th to 4th, with an rpm jump from 2500 to 4000. It has had numerous foot to the floor moves where the 5R110 will shift at 5000. The Coyote in my F150 rips upshifts at 5900. In Mustangs, the same motor with different cams is redlined at 7000.

But back to the Godzilla, it was my understanding too the HD and light duty versions make the same power, just on a different ratings scale for each. And I’ll bet the transmissions WOT shift at the same 5500 rpm or higher in either too.


Rob

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valhalla360

No paticular place.

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Posted: 09/05/22 05:06pm Link  |  Quote  |  Print  |  Notify Moderator

JaxDad wrote:

With all due respect here friend, that ‘blow it up’ idea is a myth, gas or diesel.

We had several F Super Duty’s (now called the F-450) back in the day that were built with a 5.10 gear set in the rear end, 5th gear, foot to the floor, 65 mph (110 kmh). They rarely had an easy day. Several of them we ran to 350,000+ km (210,000 miles) without any issues. There was a mix of 7.3 diesels and 460’s.


You mean the 450's with the derated engines to encourage longevity?


Tammy & Mike
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JaxDad

Greater Toronto Area

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Posted: 09/06/22 06:27am Link  |  Quote  |  Print  |  Notify Moderator

valhalla360 wrote:

JaxDad wrote:

With all due respect here friend, that ‘blow it up’ idea is a myth, gas or diesel.

We had several F Super Duty’s (now called the F-450) back in the day that were built with a 5.10 gear set in the rear end, 5th gear, foot to the floor, 65 mph (110 kmh). They rarely had an easy day. Several of them we ran to 350,000+ km (210,000 miles) without any issues. There was a mix of 7.3 diesels and 460’s.


You mean the 450's with the derated engines to encourage longevity?


De-rated? You know something the rest of us don’t know?

The 460 went from carb’ed to fuel injected which bumped the hp to 245 and it stayed that way till they were replaced with the V10.

But it wouldn’t surprise me if they were backed off for longevity, Ford has a long and very successful track record of doing so. We have several Ford tractors on the farm that are north of 12,000 hours on them without any major issues or failures.

Grit dog

Black Diamond, WA

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Posted: 09/06/22 08:17am Link  |  Quote  |  Print  |  Notify Moderator

Lumpty wrote:

If someone has only ever twisted their Ford V10 to 3500rpm max, that’s one slow ride.


It's just typical rvnet fodder... or one slow ride like you said!


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PatJ

Eastern WA

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Posted: 09/08/22 09:58pm Link  |  Quote  |  Print  |  Notify Moderator

At one point, the way "medium duty" engines were rated was different from "light duty." RVs fell in to "MD" while pickups fell in to "LD." Different RPM or different ambient noise levels or something, don't recall the details but it was different for the different classes. It may have been related to GVWR but I'm not positive on that.

One thing I am sure about is this exact discussion (argument) happening on this same forum 15 or 20 years ago when everything was 2V V10s; the pickups at that time were rated higher than the RVs. Forum members at that time with intimate geek-level V10 knowledge verified they were identical engines with identical tunes. There were a billion threads on here and other forums with all the drama and all the details explained at that time.

I suspect it's probably still the same today, the only difference between the RV and pickup engines exists on paper.


Patrick

Kenneth Sons

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Posted: 09/10/22 02:21pm Link  |  Quote  |  Print  |  Notify Moderator

Both the 430Hp and 350Hp are the same engines with the same Ford tune. Horsepower is Torque (FTLB) x RPM / 5250. When reading the power at 3900 vs 5500 rpm, the Horsepower is lower. I have a 2022 E-450 Forest River and it has revved beyond 4500 rpm pulling hills. This RV, with no engine modifications, has crested Eisenhower Tunnel at 65 mph without full throttle.

Two things happen at high rpm, first the engine heats up, causing the cooling fan to come on, and second the gas mileage drops quickly. This engine, unlike many truck and car engines doesn't use fuel enrichment for internal cooling.

The engine life, when occasionally operating above 3500 rpm, will likely outlast the RV, especially if you change oil more often than recommended such as at 3750 or 5000 miles.

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