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Old 09-03-2008, 10:07 PM   #251
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Re: Jacuzzi Bus IV

Hi Jason,
Alan can't get above 55-58mph. Comments?
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Old 09-03-2008, 11:50 PM   #252
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Re: Jacuzzi Bus IV

Here is a post from a thread in the wayback machine.

Quote:
Originally Posted by lapeer20m
i can hear/feel the trans shift from first to 4th gear. I found the axle ratio, and the tire size is easy enough to come by as well as max rpm for a 6v71

max rpm: 2350
axle rato: 4.56:1
tire height: 41.3 inches
final drive ratio: 1:1

max speed 63.34


unless that trans has overdrive which is very unlikely, someone is not telling the truth when he states it'll cruise an indicated 70 or 75 mph on the speedo which he believes to be an actual 80 -85 mph. I tested the speedo vs my gps and found the speedo to be off less than 4% ie: when speedo sais 50 mph the bus is moving almost 52 mph according to gps.

wonder how i can identify the transmission....perhaps i can find a tag on the unit when i crawl under there.

GRRRRRRRRRRRR!!!
58 mph * 1.04 (to account for the 4% discrepancy)=60.32 mph which I believe is what he quoted as a flat ground top speed. It's quite possible that it slows down from there. A bus will see a hill that you don't and slow down. I know mine does.
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Old 09-04-2008, 08:51 AM   #253
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Re: Jacuzzi Bus IV

Quote:
Originally Posted by skylinelimo
Hi Jason,
Alan can't get above 55-58mph. Comments?
I know the bus is slow, but i did warn you about that before you bid. Driving it for hundreds of miles at a time must be painful. I remember how grouchy i was when i was driving the bus home for the first time. Especially since the guy i bought it from claimed it would cruise at like 70-75mph with a max speed of 80-85. This is exactly the reason that i made sure to warn potential buyers about the bus' slow speed. On a downgrade the bus won't go over about 63 mph as the engine helps to hold the bus back. That is the fastest the bus will go.

Before bidding, when you guys called me on the phone i made sure to mention that the bus is very slow.


here is a quote I sent to you guys from the "ask seller a question" forum on ebay before you bid. I included this in my response even though the original question had nothing to do with how fast the bus will go.

Quote:
"...I drove the bus home from arizona just less than a year ago, and it is quite slow on the expressway compared to other traffic. Just want you to be aware of that before you bid. It's a great running bus, but it's a former city bus and wasn't engineered for highway travel"
I hope allen has a safe problem free trip home to texas.
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Old 09-04-2008, 09:15 AM   #254
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Re: Jacuzzi Bus IV

Jason, easy boy. I'm not accusing but your reaction was interesting nonetheless. We don't really have a problem with the speed and I bet there is a hill that is contributing that is imperceivable. I ride bikes and if the road isn't perfectly flat, my legs feel it for sure. I'm posting these questions in the spirit of the forum: progress. Which brings me to my next question: Alan is in Arkansas at the moment, and the cruising speed has dropped to about 52mph. Could there be other things contributing to this other than a hill? I am an engineer and machines don't do things without a reason. I am just diesel-dumb and thought maybe some of you guys can bring some insight.
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Old 09-04-2008, 09:17 AM   #255
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Re: Jacuzzi Bus IV

(Jason, Ah yes I see the ~4% speedo difference in your last message -- thanks) I welcome further feedback by you or others on my previous post.
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Old 09-04-2008, 01:47 PM   #256
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Re: Jacuzzi Bus IV

A bus is going to feel even the slightest hills, also wind could be a factor. The front of a bus is about as aerodynamic as a barn, so it's going to feel it when there's an extra 10mph wind blowing at you vs with you... which will effect your top speed.

My bus can usually cruise along at 70+ with little effort, but some days it's working hard to even hit 65, also at varying speeds my fuel economy can very from 6.5mpg (Wide open throttle) to over 12 if I keep it at 55mph. Slight variations you don't notice in a car make a big difference in an old bus, a good comparison is riding a pedal bike - which skyline has already mentioned.
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Old 09-04-2008, 04:19 PM   #257
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Re: Jacuzzi Bus IV

If you're losing speed I'd be looking at fuel pressure. I would think Jason changed the fuel filters, but he also didn't run the bus that much. It's quite possible the filters are plugged and it's time to change them. Since the fuel is timed and direct injected you don't have to worry about a lean mix preigniting and melting down pistons on a diesel, but less fuel is going to mean less power. It might be something to look at.
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Old 09-04-2008, 04:38 PM   #258
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Re: Jacuzzi Bus IV

Thanks Jimmy, thanks Phil. Yah don't worry, I wasn't trying to accuse Jason. I called him and had a good "bus chat". All is swell. JB4 is probably going to arrive here in New Braunfels around 10pm. I hope Alan makes it okay. I call him at least every hour and a half. He has been driving essentially nonstop, including through the night. Last time I called him, he said that he had a bit of trouble -- he for some reason thought he was following someone and didn't recognize where he was (time for sleep man!). A slight break from reality, but he says he is okay now. He stopped in Memphis at a truck stop to have a mechanic give it a once-over for safe measure and confirmed an oil leak and identified the source: the engine seal at the back (?). Something like that -- they gave a ballpark cost to replace the $10 gasket and let's just say it was alot, haha. It involves loosening the engine etc. It is a leak that looks big to a gasoline guy, but the mechanic said it really isn't that bad. No worries though. We are going to get it fixed on Monday as we have a mechanic that has already said he'll do it on barter. I propose to continue this thread at least as long as we have the bus (which should be a good while!) and give you all tales of its adventures and challenges. We already have plans for altering the front seating area to increase the seating capacity and of course not even touch the jacuzzi or the rear seating. We are going to just tweak the front a little -- and it includes a stripper pole.
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Old 09-04-2008, 04:40 PM   #259
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Re: Jacuzzi Bus IV

Thanks "experience". You posted in the middle of my typing. Yeah we were thinking maybe fuel pressure/filter needs to be looked at so will check it out.
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Old 09-04-2008, 08:45 PM   #260
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Re: Jacuzzi Bus IV

check the air filter and make sure that the intake flex hoses are not sucking closed and restricting air flow to the engine. the next thing to look at would be the throttle linkage, does the pedal open the linkage at the engine completely and hold it fimly against the stop? next check turbo pressure and intercooler function/pressure and pressure drop across the cooler as well as temp drop.
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