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Old 05-28-2013, 09:57 PM   #281
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Re: The Roach Motel

Ahhh-a bus in the woods.
On my trip into the woods last weekend, I too tried pumping up my tires-it says on the doortag 80 rear 65 front. I went up from the 65 i used to have in the rear--and you coud feel it-sure didn't help ride quality.
I'm jealous of 13mpg.
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Old 05-29-2013, 09:50 AM   #282
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Re: The Roach Motel

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Originally Posted by sdwarf36
Ahhh-a bus in the woods.
On my trip into the woods last weekend, I too tried pumping up my tires-it says on the doortag 80 rear 65 front. I went up from the 65 i used to have in the rear--and you coud feel it-sure didn't help ride quality.
I'm jealous of 13mpg.
When I first picked up this bus I inflated the tires to 80 lbs which is the number on the sidewall. At that time I didn't know that truck tires should be inflated to match the load on the tires. At 80 lbs with the interior all stripped out the ride was BRUTAL. A little while later I saw a thread on one of the RV forums about tire pressure and dropped down to 70 all around which helped a lot. Once I got the interior done I could finally get it weighed and adjust the pressure for actual vehicle weight. Fully loaded, 70 lbs doesn't feel too bad but I'm looking forward to trying out 60 lbs.

13 mpg is probably as good as it gets for this rig. I drafted everything in sight and we had a slight tail wind coming home. Of course, when you're going south it's all downhill.
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Old 05-29-2013, 10:52 AM   #283
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Re: The Roach Motel

Hey Roach ---watch your inflation numbers closely. As you correctly noted they should match your GVAW (gross load) but there are also the issues of mpg,tire wear & handling. Higher pressure will yield the best mpg as it reduces friction but also produces the roughest ride. Lower pressure will soften the ride, but at the expense of mpg so it is always a compromise. Get too low and the flexing of the tires will cause overheating and a very short tread life as well as some dangerously squishy handling. Sounds like you are going about it the right way (cautiously) just don't let a cushy ride be the only consideration. I'm planning on removing a few leafs from my springs to compensate for the much lighter load and will add air bags if I can figure out a place to mount them. That way I can balance the tire pressure for the best handling & mpg while still keeping my dentures in place. Rock on!
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Old 05-29-2013, 11:15 AM   #284
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Re: The Roach Motel

Good points there Tango.

According to the Michelin RV tire inflation tables, 60 lbs is the correct pressure for my axle loads, but I'll try 65 lbs and see if it's a good compromise in ride and MPG. At 70 lbs the handling is very good; better than my van in fact. Very little body roll on freeway exit ramps, but I assume that the wide dually axle is responsible for most of that.

Here's the Michelin RV inflation tables. Keep in mind that the weights listed are for 1/2 of the total front or rear axle load.

http://www.michelinrvtires.com/michelin ... tables.jsp
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Old 05-29-2013, 05:43 PM   #285
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Re: The Roach Motel

Hey Roach --- I can't even begin to recall how many bus folks I've encountered who've battled the "empty bus" ride effect. The max gross is what the spring rates were based on for earlier vehicles so they are really hard and bouncy at reduced (i.e., "empty") weights. Later units with adjustable air bags are easy to dial in. With older, leaf spring units, about all you can do to take it down is to eliminate a few leafs then add decent, preferably progressive, shocks or air bags and possibly something for better roll control like a sway bar. Once you get the spring rate balanced to the actual load, the tire pressure is easy to calibrate.

BTW...my shorty has a set of rear leafs that could probably handle a battle ready Abrams Tank so I've got a lot of work ahead of me in the ride department.

Onward!
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Old 05-29-2013, 06:01 PM   #286
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Re: The Roach Motel

Tango,
That's cool,mount the abrams and ride in TC spot.....they ride like a brand new 1978 caddy......did you even feel the parking curb dad?
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Old 05-30-2013, 07:55 PM   #287
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Re: The Roach Motel

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Originally Posted by roach711
Anyone know what this thingy does. Looks like it's heater related.

Did you ever figure out what that is? It's a controller for a Webasto heater. It warms engine coolant so it will start easier and the engine will warm up quicker in cold weather. They are very handy if they work.
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Old 06-01-2013, 06:59 PM   #288
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Re: The Roach Motel

Here's my Saturday project. Big job. BIG JOB. Maybe 15 minutes start to finish including hauling out and putting back the ladder. This thingy covers the roof vent so we can use the vent fan in the rain. Easy to install and easy to remove for cleaning. The rain came down just after I got the thing buttoned up and it works great. After the Fantastic vent people sent me so much free stuff I felt duty bound to actually BUY something from them.

Now I have a nice white vent cover on my nasty, filthy roof. A bus bath may be tomorrows big project.



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Old 06-02-2013, 11:02 PM   #289
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Re: The Roach Motel

Nice install of the Fantastic Vent. Do you have a 23" or 24" opening in your bus? I'm just wondering if I could easily install the Fantastic Vents in my emergency roof exits as well...
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Old 06-03-2013, 01:41 PM   #290
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Re: The Roach Motel

Vent covers were one of the best things we had on the class C. It allowed us to leave the vents open 24/7 (even with the roof air on we left the vent cracked to allow the hot air built up on the ceiling to escape). And I never had to worry again that a rain storm would dump gallons of water inside while no one was home. Wonderful things vent covers. If you have vents, you should get covers for them.
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