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Old 12-05-2008, 12:08 PM   #1
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Chassis Evolution:

MaxxForceTM engine brings diesel choice to popular Workhorse platforms

LOUISVILLE, Ky. — (Dec. 2, 2008) -- New Workhorse choices in diesel power have brought more fuel efficiency and pulling power into what was once the exclusive province of gas motor homes. A front diesel engine option is now available for two proven and popular Class A motor home chassis — the Workhorse W20 and W22.

Called the W22D and W20D, the 22,000 and 20,500 lb. GVWR diesel-powered chassis will now give RV buyers more new choices for the platforms that have become known for their exceptional ride, handling and performance. The W20D will make its debut at the Workhorse Booth, No. 2018, in the East Hall at the National RV Trade Show in Louisville Dec. 2 to 4. Two major motor home manufacturers (Winnebago & Four Winds) will also display models built on the W20D.


2009 Four Winds Serrano

This evolution of the groundbreaking W20/W22 gas platforms marks the latest appearance of a Navistar MaxxForce engine on the motor home scene. This time it’s the MaxxForce™ 7, a 230 horsepower 6.4L V8 powerplant that puts out a hefty 620 lb.-ft. of torque to provide exceptional pulling power while achieving superior performance, reliability and fuel economy. Navistar also touts the MaxxForce 7 as a quiet diesel designed to greatly reduce the noise and vibration of the engine, providing an exceptional driving experience for the RV owner. Couple the MaxxForce 7 with the six-speed Allison transmission and the RV owner will experience a new level of driving ease.


2009 W Series D Platform

The turbo with charge-air cooler is tuned to reduce noise, improve fuel economy and make MaxxForce 7-powered vehicles responsive and easier to drive. The MaxxForce 7 will provide a True Diesel™ emissions solution for 2010 that uses only diesel fuel, not both diesel and urea as required by SCR emissions control. Instead, advanced EGR and proprietary “In-Cylinder’ technology is used to meet 2010 emissions standards without additional after-treatment or negative impact on fuel economy.

“In today’s economic environment, product differentiation becomes even more critical to manufacturers,” said Workhorse Vice President of Marketing and Product Planning Tony Monda. “Navistar’s MaxxForce™ engines provide a one-two punch — differentiation and fuel economy. Even though prices have dropped recently, consumers are very sensitive to the issue.”


2009 Itasca Sunstar

“The W20 and W22 are our most popular chassis. People love the maneuverability that comes with their 50-degree wheel cut along with the stable, comfortable ride these platforms provide. Now they also have the power and efficiency of the MaxxForce™ engine. This advancement brings diesel benefits well into the price range of the smaller gasoline coaches that are becoming more prominent.”


The Workhorse W20D's Powertrain - MaxxForce7 & Allison 1000MH 6 Speed - w/ 3.73 Rear

Both Workhorse and MaxxForce are affiliates of Navistar, “These new platforms typify the benefits of the great synergy we are developing within Navistar,” said Monda. “With this excellent engine now married to some of our most well-received chassis, the RV market is beginning to see some exciting new product developments.”

Service on the W20D and W22D chassis can be performed at more than 500 Workhorse Service Centers across the U.S. and Canada, while the MaxxForce engine will be serviced at RV participating International Truck and Engine Service dealers.


Navistar MaxxForce7 Twin-Turbo, 230HP - 620 lbs/ft Torque = "Clean Diesel" =

Workhorse Custom Chassis
Workhorse Custom Chassis is an affiliate of Navistar International Corporation (NYSE: NAV), a holding company whose subsidiaries and affiliates produce International® brand commercial and military trucks, MaxxForce™ brand diesel engines, IC brand school and commercial buses, and Workhorse® brand chassis for motor homes and step vans. It also is a private-label designer and manufacturer of diesel engines for the pickup truck, van and SUV markets. The company also provides truck and diesel engine parts and service. Another affiliate offers financing services. Additional information is available at www.Navistar.com/newsroom.

For additional information about Workhorse visit Workhorse.com.
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Old 12-05-2008, 12:08 PM   #2
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Chassis Evolution:

MaxxForceTM engine brings diesel choice to popular Workhorse platforms

LOUISVILLE, Ky. — (Dec. 2, 2008) -- New Workhorse choices in diesel power have brought more fuel efficiency and pulling power into what was once the exclusive province of gas motor homes. A front diesel engine option is now available for two proven and popular Class A motor home chassis — the Workhorse W20 and W22.

Called the W22D and W20D, the 22,000 and 20,500 lb. GVWR diesel-powered chassis will now give RV buyers more new choices for the platforms that have become known for their exceptional ride, handling and performance. The W20D will make its debut at the Workhorse Booth, No. 2018, in the East Hall at the National RV Trade Show in Louisville Dec. 2 to 4. Two major motor home manufacturers (Winnebago & Four Winds) will also display models built on the W20D.


2009 Four Winds Serrano

This evolution of the groundbreaking W20/W22 gas platforms marks the latest appearance of a Navistar MaxxForce engine on the motor home scene. This time it’s the MaxxForce™ 7, a 230 horsepower 6.4L V8 powerplant that puts out a hefty 620 lb.-ft. of torque to provide exceptional pulling power while achieving superior performance, reliability and fuel economy. Navistar also touts the MaxxForce 7 as a quiet diesel designed to greatly reduce the noise and vibration of the engine, providing an exceptional driving experience for the RV owner. Couple the MaxxForce 7 with the six-speed Allison transmission and the RV owner will experience a new level of driving ease.


2009 W Series D Platform

The turbo with charge-air cooler is tuned to reduce noise, improve fuel economy and make MaxxForce 7-powered vehicles responsive and easier to drive. The MaxxForce 7 will provide a True Diesel™ emissions solution for 2010 that uses only diesel fuel, not both diesel and urea as required by SCR emissions control. Instead, advanced EGR and proprietary “In-Cylinder’ technology is used to meet 2010 emissions standards without additional after-treatment or negative impact on fuel economy.

“In today’s economic environment, product differentiation becomes even more critical to manufacturers,” said Workhorse Vice President of Marketing and Product Planning Tony Monda. “Navistar’s MaxxForce™ engines provide a one-two punch — differentiation and fuel economy. Even though prices have dropped recently, consumers are very sensitive to the issue.”


2009 Itasca Sunstar

“The W20 and W22 are our most popular chassis. People love the maneuverability that comes with their 50-degree wheel cut along with the stable, comfortable ride these platforms provide. Now they also have the power and efficiency of the MaxxForce™ engine. This advancement brings diesel benefits well into the price range of the smaller gasoline coaches that are becoming more prominent.”


The Workhorse W20D's Powertrain - MaxxForce7 & Allison 1000MH 6 Speed - w/ 3.73 Rear

Both Workhorse and MaxxForce are affiliates of Navistar, “These new platforms typify the benefits of the great synergy we are developing within Navistar,” said Monda. “With this excellent engine now married to some of our most well-received chassis, the RV market is beginning to see some exciting new product developments.”

Service on the W20D and W22D chassis can be performed at more than 500 Workhorse Service Centers across the U.S. and Canada, while the MaxxForce engine will be serviced at RV participating International Truck and Engine Service dealers.


Navistar MaxxForce7 Twin-Turbo, 230HP - 620 lbs/ft Torque = "Clean Diesel" =

Workhorse Custom Chassis
Workhorse Custom Chassis is an affiliate of Navistar International Corporation (NYSE: NAV), a holding company whose subsidiaries and affiliates produce International® brand commercial and military trucks, MaxxForce™ brand diesel engines, IC brand school and commercial buses, and Workhorse® brand chassis for motor homes and step vans. It also is a private-label designer and manufacturer of diesel engines for the pickup truck, van and SUV markets. The company also provides truck and diesel engine parts and service. Another affiliate offers financing services. Additional information is available at www.Navistar.com/newsroom.

For additional information about Workhorse visit Workhorse.com.
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Old 12-05-2008, 05:11 PM   #3
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Mike, these engine combos look real cool, except how is all that tubo and exhaust tubing fit under a low "Dog House"?

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Old 12-05-2008, 05:35 PM   #4
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Fred and Bonnie:
Mike, these engine combos look real cool, except how is all that turbo and exhaust tubing fit under a low "Dog House"? </div></BLOCKQUOTE>Fred, Well .... here's a picture of the doghouse on the Itasca Sunstar "Prototype."


Raised Doghouse Showing Increase In The Vertical Dimension

Now this is just a prototype doghouse however the dimensions may be close to what we are seeing now. Unfortunately all the charge air plumbing, the exhaust downpipe and turbos are on the top of the engine. In a truck this isn't a problem because the engine is way in front under a hood.

In a motorhome we practically sit on top of the the engine. So, "You asked for it!" and as a reporter it is my duty to provide you with the answer to your question as it relates to the RVIA Exposition.

Now here's some more engine for you:


Navistar MaxxForce7 Twin Turbo Diesel

Now the rep that I spoke with at Winnebago told me that the Sunstar at cruising speeds is very quiet. It does however present some engine sounds when accelerating or idling. Winnebago said that they may consider adding additional sound absorbing materials to the underside of the doghouse on production models.

Now if they are adding a blanket they may just need that little bit of extra room they purchased with the taller cover.

In my opinion, there isn't anyway around not having a taller doghouse.
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Old 12-06-2008, 03:26 AM   #5
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Any idea as to whether a W22D will be available to test drive at Tampa? I would love to see how 230 hp does in a motorhome that size. I've heard some people consider the 300 hp Cummins used in the 22,000 lb GVWR FRED to be marginal.
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Old 12-06-2008, 03:48 AM   #6
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by paz:
Any ides as to whether a W22D will be available to test drive at Tampa? I would love to see how 230 hp does in a motorhome that size. </div></BLOCKQUOTE>paz, Let's set out the goals for this vehicle. It has a clean diesel, it has a 6 speed transmission with 2 overdrives and it has a 3.73 rear end. The W20D shown in the pictures is on 19.5 inch tires. Obviously a W22D will most likely emerge on 22.5s.

So what we're talking here is fuel economy. Winnebago displayed a sign in their exhibit that stated 10 to 12 MPG. I'm sure they must have achieved those numbers in prototype testing so I'm happy with that and I'll give them the benefit of the doubt. The Serrano appears to have a very aerodynamic box as well so it should be able to follow closely along those economy lines.

Now that said, we are not going to experience the (in comparison) blistering off the line acceleration from a MaxxForce7 as we have seen from our 8.1s however I have been assured that the vehicle merges well into high speed traffic on the Interstate.

At this time there are some folks at Workhorse that said it would be nice to have a vehicle in Tampa to drive while others said that it may take a little while longer before a ride & drive demonstrator becomes available.

Damon has and continues to build a number of Avanti Motorhomes but those are on the W16D.

A heads up comparison between FRED and W2xD would certainly be interesting. As configured the FRED's ISB has more horsepower. The MaxxForce7 provides 620 lbs/ft and the Cummins ISB provide 600 lbs/ft of torque.

I think the basic need in diesels is torque and when the whole thing gets up and moving HP is not as critical once you're up to speed and cruising.

Come and look me up, I should be in the exhibit area in Tampa.
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Old 12-06-2008, 05:20 AM   #7
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Where did the 20 ft. lbs of torque disappear? 620 ft. lbs at the first post, now down to 600???? Wuz up??????
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Old 12-06-2008, 05:47 AM   #8
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I am not an engineer by any means, but looking at the engine with twin turbos on top of the engine, I would sure want some heavy heat insulation in the doghouse cover. Also would need lots of air flow around the engine top. Those exhaust turbine housings are hot! hot! hot! under power.

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Old 12-06-2008, 06:10 AM   #9
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by MikeT:
Where did the 20 ft. lbs of torque disappear? 620 ft. lbs at the first post, now down to 600???? Wuz up?????? </div></BLOCKQUOTE>OK - So add Twenty! I've been writing a lot of articles lately and the numbers get blurred at times.

You didn't catch that "Four Winds" Avanti error either! Wake up!
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Old 12-06-2008, 06:21 AM   #10
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by dieselclacker:
Also would need lots of air flow around the engine top. Those exhaust turbine housings are hot! hot! hot! under power. </div></BLOCKQUOTE>Dieselclacker, I did not hear the OEMs discuss that with me and there are 3 of them. Sound insulation and shedding heat are very important as you suggested.

When I saw the FRED on the floor it had what appears to be a Nomex or other type of sock over the outlet pipe from the turbo outlet to where it connects to the catalyst or AB system. On the W16 and W20 in the exhibits, I did not see extra measures to shield heat however in production that may change.
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Old 12-07-2008, 01:38 AM   #11
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My question is, how big is the fuel tank? Did Workhorse use their std. 75 gal. fuel tank or did they go bigger like a 90 gal. tank. 90 gal. would be much better due to the extended cruising range. Although there is alot to like about diesel engines, in most places #2 diesel cost $1.00 more than 87 octane gas. In the Detroit area I can buy gas for $1.50 less than diesel fuel using my Kroger discount. Kroger allows you (4) fill-ups per month! Bagman57
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Old 12-07-2008, 02:39 AM   #12
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I think this engine might work out in the UFO but I for one think adding back a large hump in the driver/passenger area is a step backwards. It took years to get these humps down to where they were not a problem. My wife is handicapped and when we bought our W22 she loved the low profile (about 2 inches) engine hump.

Also, I agree with the other poster regarding the fuel tank. Hopefully they will have a large fuel tank. In the west a large fuel tank is a must have. Although there are a lot of fuel stations out here not all RV friendly regarding getting in and out, especially when pulling a toad.
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Old 12-07-2008, 04:17 AM   #13
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I think the idea of any new chassis with the engine in the front (especially a diesel) is a step backwards. And worst of all with the way the market is reactive not proactive, the cost of fuel is not that much of a factor right now. Who's willing to sacrifice room, comfort and quiet for a few more mpg for 146,000 msrp bucks? Maybe people who like toy haulers but that is about it. I can understand that the price of fuel before the crash of 08 did drive this concept of smaller retro like coaches, but why not make a smaller chassis with the engine in the rear? Wait! There is one...the UFO 22. And maybe one day a UFO 16.
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Old 12-07-2008, 07:29 AM   #14
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I still want someone on this forum that has a Workhorse connection to find out the size of the fuel tank. The Freightliner "FRED" has a 80 gal. tank and if Workhorse comes out with a 75 or 80 gal. tank, they are missing out on taking advantage of not having a 90 or 100 gal. tank. Lets face it, Freightliner got into the front end diesel business first and the Cummins 6.7L TD is a know commodity. It is basically a reworked 5.9 ISB that meets the current emission standards. I personally like Workhorse Custom Chassis, but would have to see features that make it more appealing than the "FRED"! Chuck/Bagman57.
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