Community Forums

jharrell · 05-15-2017, 06:45 AM

So there has been some info about what will probably replace the V10 in the 2020 time frame. Looks like its currently called the 7x and will be a 7 liter V8, more power better fuel economy.

Should be interesting to see more details as the become available and how it will perform for MH's:

Ford Confirms Jobs While Everyone Speculates Over New Truck Engine

WILDEBILL308 · 05-15-2017, 09:35 AM

That could be interesting. I would think they would go a little larger for the RV market. Cummins is pushing their new V8 diesel for applications like that. When I asked them when we were in Chandler AZ this spring if they had plans to scale it up a little. They wouldn't comment but there were some smiles.
Bill

mre · 05-15-2017, 01:02 PM

Does 5-Star have a tune for it yet?

Sweetbriar · 05-18-2017, 08:23 AM

I'm a bit surprised they haven't announced the end of producing heavy application chassis with a gasoline engine and have gone diesel only. Granted may gas coach owners prefer the alternative but when you're the sole provider you get to call the shots. Probably has more to do with what the package delivery services want rather than the RV sector.

jharrell · 05-18-2017, 08:39 AM

Quote:

Originally Posted by Sweetbriar

I'm a bit surprised they haven't announced the end of producing heavy application chassis with a gasoline engine and have gone diesel only. Granted may gas coach owners prefer the alternative but when you're the sole provider you get to call the shots. Probably has more to do with what the package delivery services want rather than the RV sector.

There is still a demand in fleets, cheaper on initial cost and maintenance, just more in fuel.

MH's the same story, but also weight. Would love to see a Powerstroke option on the F53 but its 500lbs more than the V10 plus diesel generator cost and weight. My motorhome would have half the carry capacity if it was diesel unless they also beefed up the chassis then more cost and weight and so on.

Interested to see the details of the 7x, lots of speculation whether it will be pushrod or DOHC, direct injection or port, etc.

dwaugh10 · 05-18-2017, 03:39 PM

I'm hoping it won't be as high reving as the V10. I really hate the engine screaming at 4500-5000 rpm.

David
2013 Vista 27N

WILDEBILL308 · 05-18-2017, 06:42 PM

The all-new Cummins 5.0-liter V8 Turbo Diesel engine generating 310 horsepower with 555 pound-feet of torque, this revolutionary 32-valve engine produces enough power to replace the V-10. Plus it would be easy to bump it up.

Bill

jharrell · 05-18-2017, 07:37 PM

Quote:

Originally Posted by WILDEBILL308

The all-new Cummins 5.0-liter V8 Turbo Diesel engine generating 310 horsepower with 555 pound-feet of torque, this revolutionary 32-valve engine produces enough power to replace the V-10. Plus it would be easy to bump it up.

Bill

Cost and weight still an issue although not as bad. 900lbs for Cummins V8, 600 lbs for V10. Diesel gen is 200lbs more as well plus cost. Doesn't seem like much but 500lbs comes right off carry capacity, its a load of water.

Tiffin breeze using Cummins V8 with custom chassis, haven't heard much good or bad, 240k MSRP.

Ford not going to put a Cummins in the F53, so it would be Powerstroke at 1100lbs.

nothermark · 05-19-2017, 08:57 AM

Somebody got it right - most of us do not want the hassle of a diesel with diesel mechanics and diesel shops. The fuel savings won't come close to the rest of the added cost when you consider most of us don't do more than 10,000 miles per year. Many do a lot less. Then there is the weight... I don't get why some folks think there is a benefit.

unyalli · 05-19-2017, 09:03 AM

ecoboost the coyote.

- Jeff

stvdman · 05-19-2017, 09:06 AM

Quote:

Originally Posted by dwaugh10

I'm hoping it won't be as high reving as the V10. I really hate the engine screaming at 4500-5000 rpm.

David
2013 Vista 27N

I was of the EXACT same notion...had a 2008 FORD E450 based Class C with V-10. HATED it, didn't like the driving dynamics of the Engine/Trans combo. Traded it in on a 2008 Chevrolet Kodiak based Class C with 8.1 Gas V-8 / Allison trans combo, liked it MUCH better.

Fast Forward to 2017, traded that in on a 2017 Thro Miramar F53 Chassis w/V-10 6-Speed Torque-Shift trans...like the driving dynamics better than both previous set-ups.

Torque production seems MUCH improved in lower RPM range and transmission has been recalibrated with that in mind, they work very well together, hardly ever see 3500+ rpm (only when climbing a steep grade or downshifting when going down a steep grade, saw it maybe 5 times on r/t from MD to FL this spring), and trans holds 5th and 6th gears much better when cruising and going up slight grades. Old V-10 would shift to 4th, be at like 3400-4000 rpm as the very slightest rise in pavement , even it seemed if it was just 2-3 degrees.

jharrell · 05-19-2017, 09:40 AM

Quote:

Originally Posted by unyalli

ecoboost the coyote.

- Jeff

Everything I have heard Ecoboost loses its advantage when loaded up all the time. Works great when lightly loaded most of the time but can still tow when needed like an F150.

Ecoboost almost as complicated as a diesel with direct injection and compacted graphite block, if you can get the same loaded performance out of a 7.0L NA engine for less money and simpler design, not much point.

There is some word the Mustang Shelby GT500 will be powered by this new 7x engine as well.

MikeD1 · 05-19-2017, 05:25 PM

Quote:

Originally Posted by stvdman

I was of the EXACT same notion...had a 2008 FORD E450 based Class C with V-10. HATED it, didn't like the driving dynamics of the Engine/Trans combo. Traded it in on a 2008 Chevrolet Kodiak based Class C with 8.1 Gas V-8 / Allison trans combo, liked it MUCH better.

Fast Forward to 2017, traded that in on a 2017 Thro Miramar F53 Chassis w/V-10 6-Speed Torque-Shift trans...like the driving dynamics better than both previous set-ups.

Torque production seems MUCH improved in lower RPM range and transmission has been recalibrated with that in mind, they work very well together, hardly ever see 3500+ rpm (only when climbing a steep grade or downshifting when going down a steep grade, saw it maybe 5 times on r/t from MD to FL this spring), and trans holds 5th and 6th gears much better when cruising and going up slight grades. Old V-10 would shift to 4th, be at like 3400-4000 rpm as the very slightest rise in pavement , even it seemed if it was just 2-3 degrees.

X2, our 2017 Newmar Baystar weighs about 8000 lbs more than the 05 31' Class C we traded in but equals or surpasses the gas mileage and is much more refined. I think a lot of it is the 6 spd vs 4 spd tranny, but the engine just feels better and stronger overall.

nothermark · 05-20-2017, 06:36 AM

The problem with the Eco Boost or any other supercharged engine is that the boost increases internal pressures and adds some expensive complexity. It's a way to get more power out of a given displacement with some increase in efficiency but it works the engine harder so it has to be built heavier in order to get the longevity we get out of non boosted engines.

Ford has been using those engines in Europe for a while so the basic issues probably were sorted out as much as possible there. They still did some significant reworking of the design here. It will be interesting to see if they get the kind of longevity we are used to with the V-10. When they break they will cost more to fix.

One interesting thing is that it works better with high revving engines. Addin boost to the V-10 would be awesome if the engine held up. Put the shift points around 4000-45000 rpm and enjoy the scream! That's a scream of pleasure, not pain.