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BMC (Bluebird Motor Coach Unique Issues) If you have a unique issue with your BMC coach and it can't be answered in one of the other forums here, then this is where you can list it.....List your BMC Parts here too.

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  #31  
Old 02-05-2010
AC7880 AC7880 is offline
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Thats what I recall from crawling around under my coach. I did not ask the tech that adjusted my ride ht today, and I was not allowed in the pit to "look around".



Quote:
Originally Posted by bwinter1946 View Post
Just a little FYI: If memory serves (It has been a while) the Spartan Chassis is the opposite of the Bluebird chassis. The BMC Spartan Mountain Master Chassis has two height control valves on the front and one in the back. Rear only adjusts rear height and the front adjusts height and diagonal.
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  #32  
Old 02-05-2010
davidmbrady
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Dan,

It would be cool to have more info, but I understand, don't risk life and limb crawing under that thing. It's curious that your wheel weights are so different (left to right), but without knowing the suspension geometry it's hard to make an educated guess. I have my doubts about adjusting HCV's to correct the imbalance, there's simply too much flex in the frame, and more than likely, on at least one axle your left and right air bags are tied together, which defeats the corner weight aproach. The corner weight thing works on an ultra stiff coil sprung racecar, but maybe not so well on a 40' bus.

Last edited by davidmbrady; 02-05-2010 at 11:22 PM.
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  #33  
Old 02-05-2010
AC7880 AC7880 is offline
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37' BMC has no tag, 40' BMC does have a tag. 2 level adjusters in front, 1 in back.
Front axle solid beam type, Eaton EFA-124F, Reyco air susp, Meritor FF961??, rear axle is Eaton 22,000 lb from BB silent recall.


Quote:
Originally Posted by davidmbrady View Post
Dan,

Think of a 4 legged stool, cut one leg short, and the diagonal leg also flops about; the adjacent legs hold the stool up.

BTW, who's suspension system does Spartan use. BB used Ridewell. On the BMC, did Spartan use homebrew? What does it look like? Does it have multiple trailing links, panhard, independent, etc? The drive is surely a stick, how 'bout the steer? Do you have a tag?
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  #34  
Old 02-05-2010
Stephen Stephen is offline
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eaton reyco
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Last edited by Stephen; 02-05-2010 at 11:45 PM.
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  #35  
Old 02-05-2010
davidmbrady
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Dan,

Any idea how the axles are attached to the frame? On a BB, Ridewell uses 4 trailing links with great big rubber bushings. The four links allow the whole thing to move in a parallelogram fashion. The big bushings give lots of suspension compliance which results in a lot of independent wheel motion.
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  #36  
Old 02-05-2010
Stephen Stephen is offline
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here is the pdf
have at it
incidentally they are posted in the database
Attached Files
File Type: pdf MM Eaton Verst 240AR.pdf (622.2 KB, 213 views)
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  #37  
Old 02-05-2010
AC7880 AC7880 is offline
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Yesterday I moved some weight around in the basement, and today Brazel's did a bunch of suspension changes for me. Most of this was not to solve the weight imbalance, but rather to improve overall handling.

The 94 BMC 37' had no factory sway bars, 95 to 97 did. I had them install Roadmaster sway bars front and rear, and remove the steer safe I had on there. I had them install a Safe-T-Plus steering stablizer to replace the steer-safe.

They set ride height for me: Coach was 1' too high in front, .5 inch too low in rear. I had them do a alignment for me.

I had other work done also - will post seperately.

New weights:
Left front 6440 lbs, RF 5060 lbs, 11,500 total.
Left rear 10320 lbs, RR 11,040 lbs, 21,360 lbs total rear, 32,860 lbs total coach - a little less water on board than yesterday.
Left side total: 16760, right side total 16100

Yesterday:
Left front 6720 lbs, RF 5120 lbs, 11,840 total.
Left rear 9760 lbs, RR 11,600 lbs, 21,360 lbs total rear, 33,200 lbs total coach.

I only ran 15 miles after the service to a campground and will hang out here 3-4 days just south of Olympia WA. The coach seemed tighter and steering tighter in this short run today.


Quote:
Originally Posted by AC7880 View Post
9-16-2009 I weighed my BMC 37' myself in a OR weigh station.
Then:
Full fuel (around 140 gallons), 1/2 tank fresh water of around 50 gallons, propane around 3/4 full, both of us seated as for travel.

Left front 6500 lbs, RF 5500 lbs, 12,000 total.
Left rear 10,000 lbs, RR 11,400 lbs, 21,400 lbs total rear, 33,400 lbs total coach.

I am at Brazel's Performance RV in Centrailia WA, and they weighed for me today.
Nearly full fuel (around 130 gallons), 1/2 tank fresh water of around 50 gallons, propane 100% full, no one in coach, fully loaded for fulltiming.
Left front 6720 lbs, RF 5120 lbs, 11,840 total.
Left rear 9760 lbs, RR 11,600 lbs, 21,360 lbs total rear, 33,200 lbs total coach.

After they weighed the coach, I moved some basement weight (heavier items on left rearward, light items on left forward, heavier items on right forward, lighter items rearward. Tomorrow they will set my ride height and re-weigh the results.

I'll post the results after all my service is done and we relocate to the next campground.
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  #38  
Old 02-05-2010
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We have different axle 94 to 97.

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Originally Posted by Stephen View Post
here is the pdf
have at it
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  #39  
Old 02-06-2010
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From Stephen's doc it's clear how the front axle works. I wonder how the drive axle is connected to the frame.

The steer axle appears to get it's independent wheel motion from the flex of the trailing links. It's kind of an air spring / leaf spring hybrid (with one leaf). The flat steel trailing arms need to twist and flex to give independent wheel motion.
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  #40  
Old 02-06-2010
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At the BB auction i wanted to buy the scales,they were not in the auction.
If we had a set of scales we could have some interesting testing at a rally,like Maxton,plenty of flat concrete there!
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