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Author Topic: The World's Fastest Motorhome  (Read 8642 times)

Bob Maxwell

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The World's Fastest Motorhome
« on: January 31, 2011, 01:38:23 PM »
Dennis Scheve, who is the GMC man at Dyno Sources, set the World Land Speed Record for a Class A Motorhome on the Bonneville Salt Flats, 102.7 mph,  September 14, 2006

http://www.gmcmhphotos.com/photos/showphoto.php?photo=18725&cat=4599
Adiós. . .

Bob †
 
. . . still ridin' for the brand.

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Molaker

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Re: The World's Fastest Motorhome
« Reply #1 on: January 31, 2011, 03:51:41 PM »
Do you think it really needed that rear spoiler to hold it down?
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Bob Maxwell

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Re: The World's Fastest Motorhome
« Reply #2 on: January 31, 2011, 04:07:32 PM »
1. It has a very light rear end with front wheel drive.
2. It has a lot of length to provide a bottom surface that enhances lift.
3. They did the calculations --if it didn't help, it wouldn't have been used.

They reportedly tweaked it and entered the offical test area at 107+ but blew the engine before compleating the required distance.

The GM wind tunnel designed body sure helps!
Adiós. . .

Bob †
 
. . . still ridin' for the brand.

1994 Suncruiser 34RQ, Cummins 5.9L/230 Allison 3060
'08 Kia Spectra5,
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Rio Communities NM, just east of the Rio Grande

glockholiday

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Re: The World's Fastest Motorhome
« Reply #3 on: January 31, 2011, 08:58:36 PM »
That doesn't seem like that big of a feat. My dad's 86' Winnebago Elanden 34' with a 454 was all stock and pulling a 20' enclosed trailer with 4 quads in it I had it up to the low 90's several times on the flats between Phoenix and Yuma going to the dunes. Of course it took miles to get there, and I don't know how much track he had to get up to 102. I think with just a few thousand in engine and tranny mods I could beat that. With miles of road in front of me. I'd like to watch the motorhome class run at the flats. That's be a fun day.
« Last Edit: January 31, 2011, 09:00:31 PM by glockholiday »
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HoosierGMCRVer

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Re: The World's Fastest Motorhome
« Reply #4 on: January 31, 2011, 09:54:22 PM »
Bob,

Supposedly, they were making several attempts at the Bonneville time trials.  They were clocked
at that speed on their best attempt prior to the time trials getting rained out.

Incidentally, it was reported that when they made the speed run, they didn't get out of 2nd gear
( Super, in a Turbo HydraMatic transmission )

Larry

V2Neal

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Re: The World's Fastest Motorhome
« Reply #5 on: January 31, 2011, 10:01:15 PM »
Incidentally, it was reported that when they made the speed run, they didn't get out of 2nd gear
( Super, in a Turbo HydraMatic transmission )

Larry

If true, that might explain why the engine grenaded. Olds engines are easily starved for oil. Don't ask how I know.  ::)
1975 GMC 26'

ennored

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Re: The World's Fastest Motorhome
« Reply #6 on: February 01, 2011, 08:34:26 AM »
Gotta drag that GMC back to Bonneville....

http://www.motorhoming.com/motorhomingnews/558-record-breaking-motorhome-breaks-record

(100 MPH, on salt, at approx 5000' of elevation isn't as easy as it sounds...)

Bob Maxwell

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Re: The World's Fastest Motorhome
« Reply #7 on: February 01, 2011, 02:23:13 PM »
A class B+ that in it's stock form is something I'd gladly park in my drive!

They did modified the Hymer body and windows and it's significantly lighter than the  stock GMC, 26' class A. The airport provided less resistance than the salt flats --it all helps! I couldn't find a weight in the Hymer literature.

The GMC spoiler was added, the 454 dyno tuned and the more than 5 ton Class A headed down the salt flats.

I found more of the story yesterday at the Orlando Co-op that found the GMC used for the class A record.

http://gmccoop.com/land_speed_record.htm
Adiós. . .

Bob †
 
. . . still ridin' for the brand.

1994 Suncruiser 34RQ, Cummins 5.9L/230 Allison 3060
'08 Kia Spectra5,
FMCA SKP

Rio Communities NM, just east of the Rio Grande

Orick

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Re: The World's Fastest Motorhome
« Reply #8 on: February 01, 2011, 04:20:41 PM »
My dad's 86' Winnebago Elanden 34' with a 454 was all stock and pulling a 20' enclosed trailer with 4 quads in it I had it up to the low 90's several times on the flats between Phoenix and Yuma going to the dunes.

Thanks for the warning.  Yet another reason to avoid that stretch of road.
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V2Neal

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Re: The World's Fastest Motorhome
« Reply #9 on: February 01, 2011, 04:33:16 PM »
The GMC spoiler was added, the 454 dyno tuned and the more than 5 ton Class A headed down the salt flats.

Chevy powered? Boooooo.  :P
1975 GMC 26'

John From Detroit

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Re: The World's Fastest Motorhome
« Reply #10 on: February 01, 2011, 05:28:52 PM »
I liked the article where they pulled up to the race line at the Salt Flats and the man says 'Motor homes park over there" and they explained they were there to set a speed record.

I mean, how many salt flat record setting race vehicles can you
1: Drive to the track (As opposed to transport)
2: Live in.
Nothing adds excitement like something that is none of your business
My Home is where I park it.

gwcowgill

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Re: The World's Fastest Motorhome
« Reply #11 on: February 08, 2011, 08:52:44 AM »
Quote
A Class B+ in stock form I would gladly park in my driveway

I made that mistake, I was totally unhappy going from a 5'er to a HR Augusta 29TSX. Inside nice but the storage I lost was unbelievable, plus HR picture was very misleading about the rear compartment. Now with a New/old Class A  (2009) Bounder Diesel Pusher. Set on Lot 2 years and has 6000 miles on it. Bought it at used price.  I can now carry what I had in the 5'er plus the ride is so much better.
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34footer

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Re: The World's Fastest Motorhome
« Reply #12 on: February 08, 2011, 06:56:12 PM »
That doesn't seem like that big of a feat. My dad's 86' Winnebago Elanden 34' with a 454 was all stock and pulling a 20' enclosed trailer with 4 quads in it I had it up to the low 90's several times on the flats between Phoenix and Yuma going to the dunes.
WHY?
j
1988 Pace Arrow, 34 feet, Chevy 454
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glockholiday

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Re: The World's Fastest Motorhome
« Reply #13 on: September 20, 2011, 11:39:39 PM »
Why not?

We go to the dunes a lot just west of Yuma. Just east of Yuma there is a big hill and at the campfire it's come up a few times about what speed we can pull the hill with our rigs going west bound so I wound her up on the straight before the hill to see how the old 454 compared to everyones new diesels. She held her own.
« Last Edit: September 20, 2011, 11:42:54 PM by glockholiday »
Don't worry, if your parachute fails, you have the rest of your life to fix it.
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Mr Bojangles

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Re: The World's Fastest Motorhome
« Reply #14 on: September 21, 2011, 04:07:34 AM »
Glockholiday:

Wow!
Does your Dad know how his 454 performed.....?
SAFBVET    Jim O
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Re: The World's Fastest Motorhome
« Reply #15 on: September 21, 2011, 08:53:51 AM »
The state police likely do. ;)
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taoshum

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Re: The World's Fastest Motorhome
« Reply #16 on: September 21, 2011, 09:33:23 AM »
WHY?
j

He's a leader in helping get rid of gasoline.  Just sayin', when we get rid of it, then we'll work harder to find a viable alternative.
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catblaster

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Re: The World's Fastest Motorhome
« Reply #17 on: September 21, 2011, 03:01:22 PM »
A note on the Olds oil starvation. I can't speak specifically about the olds engines but the caddy 472 and 500's have bearing journal so large in diameter they tend to wipe the oil film off the bearings at high rpm's. I mention this because I had heard they used some caddy motors in the GMC motorhomes.....don't know that to be true and hope someone might enlighten me.
Will and Jane
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Bob Maxwell

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Re: The World's Fastest Motorhome
« Reply #18 on: September 21, 2011, 05:57:47 PM »
Some GMC owners so enjoyed the 455's power and speed that they replaced the the 455 with the Caddy 500.

When the GMC first came out in '73 I was living in Elkhart IN and working for Coachman. That fall, we were returning at about 10am from my in-laws in Merrillville IN on. the Indiana Toll Road. Somewhere between Portage and Laporte, A new sleek motorhome appeared in my rear view mirror. I was doing 78+mph. As we got within 10 miles of the US 31 South Bend exit, it blew by me at about 90 mph, full of green wearing men and I saw them get off. . .  They must have been running late for a tailgate party. And that would have been a stock 455.  ::)
Adiós. . .

Bob †
 
. . . still ridin' for the brand.

1994 Suncruiser 34RQ, Cummins 5.9L/230 Allison 3060
'08 Kia Spectra5,
FMCA SKP

Rio Communities NM, just east of the Rio Grande

catblaster

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Re: The World's Fastest Motorhome
« Reply #19 on: September 21, 2011, 06:09:26 PM »
Does anyone remember a Saturday morning TV show that had one of the GMC's customized into a crime fighting machine 8)
Will and Jane
95 Winnebago Luxor

R1Kirby

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Re: The World's Fastest Motorhome
« Reply #20 on: September 22, 2011, 03:35:19 PM »
Maybe I'm missing something, but what the point of doing 102.7 mph in a motorhome?
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catblaster

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Re: The World's Fastest Motorhome
« Reply #21 on: September 22, 2011, 04:58:59 PM »
Well I missed it too, it must be like the fart cannon exhaust they put on toyotas and civics. A full paycheck, weekend off and nuttin to do.
Will and Jane
95 Winnebago Luxor

Mopar1973Man

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Re: The World's Fastest Motorhome
« Reply #22 on: September 23, 2011, 09:47:06 AM »
Maybe I'm missing something, but what the point of doing 102.7 mph in a motorhome?

I'm right with you... I don't see the point in it... I thought the whole idea of a RV is to slow down and relax not try to make speed records...

I rather see people compete on good of MPG's they can pull out of there RV's...
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1275gtsport

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Re: The World's Fastest Motorhome
« Reply #23 on: September 23, 2011, 10:22:10 AM »
Maybe I'm missing something, but what the point of doing 102.7 mph in a motorhome?

because you can :)


34footer

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Re: The World's Fastest Motorhome
« Reply #24 on: September 23, 2011, 06:38:25 PM »
because you can :)
107 at bonnie is cool, 90+ on the public hwy in an RV with trailer in tow is........
J

1988 Pace Arrow, 34 feet, Chevy 454
                       So Cal

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Re: The World's Fastest Motorhome
« Reply #25 on: September 23, 2011, 07:26:09 PM »
I guess I never paid attention while tire shopping, but they must sell S rated tires to fit RV's.

As to the question of "WHY?"

For the same reason the Terra Wind exists.

As mentioned previously, 100+ in a vehicle specifically designed to go that fast... Pretty cool.
Anything over maybe 70 or 75 just to keep up with traffic... Forget it. I don't see any reason to risk it, especially after experiencing a catastrophic tire loss on I-95 at about 70 MPH. Disney himself couldn't build a ride like that.

Common sense to many of us is, unfortunately, the higher education some strive to attain.

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Re: The World's Fastest Motorhome
« Reply #26 on: September 23, 2011, 10:26:57 PM »
 :o I just bet that got your attention in a hurry. There was a time when I would have enjoyed an adrenaline rush like that but fear and common sense (plus a wife) are keeping me in check now.
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Re: The World's Fastest Motorhome
« Reply #27 on: September 24, 2011, 08:19:28 AM »
I learned from the experience of my life, that you do not want a blow out at 75 mph. It's a real eye opener...
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V2Neal

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Re: The World's Fastest Motorhome
« Reply #28 on: September 27, 2011, 02:52:13 PM »
A note on the Olds oil starvation. I can't speak specifically about the olds engines but the caddy 472 and 500's have bearing journal so large in diameter they tend to wipe the oil film off the bearings at high rpm's. I mention this because I had heard they used some caddy motors in the GMC motorhomes.....don't know that to be true and hope someone might enlighten me.

I can't say about the Caddy engines, but the Olds oil galleys that feed the main bearings are 3/8" diameter. At High RPM they don't have enough flow/pressure with a standard oil pump. The fix is placing bore reducers into the mains.
I learned all this after spinning a rod bearing in my 1970 W-30.  :'(
1975 GMC 26'

34footer

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Re: The World's Fastest Motorhome
« Reply #29 on: September 27, 2011, 03:14:40 PM »
I can't say about the Caddy engines, but the Olds oil galleys that feed the main bearings are 3/8" diameter. At High RPM they don't have enough flow/pressure with a standard oil pump. The fix is placing bore reducers into the mains.
I learned all this after spinning a rod bearing in my 1970 W-30.  :'(
The Olds engine needs the Mondello SP-754 oil pump. (high volume) Used it on my jet boat with the 455 engine. They also have a 756 pump(high volume and high pressure), but you need the larger oil pan also.
J
1988 Pace Arrow, 34 feet, Chevy 454
                       So Cal