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Author Topic: Jakes for an 8V71N  (Read 3021 times)
TomC
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« Reply #15 on: March 15, 2010, 08:27:45 AM »

Last summer we took (in California) from highway 395 near the Nevada border, 89 (Monitor Pass) over one set of mountains, then Highway 4 (which had a big sign that said the highway was not recommended for vehicles over 25ft and with some 28% grades) down to Angels Camp in the San Juaquin Valley.  Two things I'm very thankful of having-one is the turbocharger-I know I would have gotton stuck on a couple of the switch backs with the natural engine, and two having the Jake Brakes-which coming down 8% grades, and holding the V730 in 1st (the torque converter will lock up in 1st if you pull the shifter down into 1st) which allowed safe decent without much use of the brakes. 
If you're going anywhere west of Interstate 25, you need Jake Brakes on your buses.  Remember, when these buses were in service, they were mainly on interstates with a maximum of 6% grades.  And coming down a grade at 65mph, the wind resistance will pretty much take care of the speed.  But not if you're winding around on some goat trail in the high mountains.  Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
JackConrad
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« Reply #16 on: March 15, 2010, 09:09:09 AM »

with some 28% grades 
Good Luck, TomC

28% grades?  Now that is one steep road  Jack
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« Reply #17 on: March 15, 2010, 09:37:50 AM »

Looks like a fun drive.

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R.J.(Bob) Evans
1981 Prevost 8-92, 10 spd
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« Reply #18 on: March 15, 2010, 09:44:01 AM »

To make it simple 28% is a 28 foot rise every 100 ft I doubt if I could climb it on foot LOL  



good luck
« Last Edit: March 15, 2010, 10:24:33 AM by luvrbus » Logged

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« Reply #19 on: March 15, 2010, 09:52:45 AM »

How do I get a hold of Don Fairchild?

Josh
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Josh Miller, Attorney, hockey player, son, brother, friend and busnut...
1983 MCI MC9 8V71 and a 5 Speed
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Lin
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« Reply #20 on: March 15, 2010, 09:58:13 AM »

Okay, so if I am reading the chart right, the first climb is about 3300 feet over about 9 miles making it around a 7% grade.
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« Reply #21 on: March 15, 2010, 11:34:34 AM »

Lin there's probably stretches in there that are considerably more exciting than the average but I agree, 28% sounds a little extreme.  I don't know if I could climb 28% but I know for sure I wouldn't dare try pulling a shift on that steep a grade.
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R.J.(Bob) Evans
1981 Prevost 8-92, 10 spd
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1968 Silver Eagle Model 01 8V71 Allison 740 #7443


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« Reply #22 on: March 15, 2010, 11:54:38 AM »

John, I sent you a PM with Don's phone numbers.

Paul
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« Reply #23 on: March 15, 2010, 12:18:39 PM »

Also, at those altitudes a naturally aspirated engine will be gasping for oxygen anyway.
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« Reply #24 on: March 15, 2010, 10:36:20 PM »

The 28% grades happened for a few yards at switch backs (if I remember, about 4 of them).  Otherwise it was maybe around 8-10% grades.  Needless to say, I won't do it in the bus again, but it would be a spectacular drive in a convertible or a motorcycle. 

Bob-that's a great graph-where did you get it from?  Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
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« Reply #25 on: March 16, 2010, 05:54:57 AM »

I can help you cheap Fred North Florida Bus Conversion. Call 850 929 40 21
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« Reply #26 on: March 16, 2010, 08:54:40 AM »

One thing I don't see addressed here is:

If you have an allison the transmission will go out of lockup about 15 mph and the Jakes will no longer work until you get above lockup speed again.

This is pretty scary when you're low on air, out of lockup and in the switch backs.

Personal experience and I assure you that you will be able to snip buggy washers from your special place.
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Joe Laird
'78 Eagle
Huron, South Dakota
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« Reply #27 on: March 16, 2010, 09:03:38 AM »

Thats when you need the lockup switch on a Allison, I had one when I lived in Idaho also it cost me a flex plate one time when I forgot to turn it off. 


good luck
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« Reply #28 on: March 16, 2010, 11:41:11 AM »

Bob-that's a great graph-where did you get it from? 


Its called GPS Visualizer.  All I did was set up your route on google maps and plug in the url to the google map but there's other options for the serious GPS fanatic.
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R.J.(Bob) Evans
1981 Prevost 8-92, 10 spd
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« Reply #29 on: March 16, 2010, 10:07:45 PM »

Thanks for that bit, Bob. I think we just might get some use out of it.

Tom Caffrey
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Tom Caffrey PD4106-2576
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