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 03/22 |
Moved Reply: Bill, I did consider the "Watts linkage" (we call it a "Z" bar in racing circles) and do know of the advantages and have had those on several of my race cars. After a full and detailed analysis of the motion, the panhard bar is OK and will not contribute to unsettling issues during true horizontal motion of the tail.I have very little coach lean. My fuel tank is just behind the front axle, and the difference between full and empty isn't that much, that is why I rejected the battery move idea, again it would help but not enough to justify the effort and cost, would also loose valuable storage space. Ed 94 30' Breakaway #3864 30-BS-6B side entry New Cummins 5.9L, 375+ HP Allison 6 speed Spartan chassis K9DVC Tankless water heater | |||
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First Month Member 11/13 |
Moved Reply:
Have you considered a Panhard rod going from the frame on one side to the other end of the axle housing? There is a theoretical advantage to the longer bar, which increases more with suspension travel. I saw the difference on an off-road racing pickup.
What kind of ends did it have? How did they fail?
Even with very limited lean, an anti-roll bar can help sway, as there is an interrelationship. Have you considered an anti-roll bar in the rear from a heavy Pee chassis? IPD used to sell stiffer vinyl bushings. It would be cheap and easy. Typically, stiffer anti-roll characteristics abaft will increase oversteer, so this is something to consider. . 84 30T PeeThirty-Something, 502 powered | |||
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| 03/22 |
Moved Reply:
There is a relationship to lean and sway but in the Breakaway case and the amount of sway vs.lean a sway bar will not help, I have done the math, the only thing the anti-roll bar will do it increase the differential bump harshness. The breakaway have a low profile and the CG is quite low. we are not trying to get racecar characteristics, just a bit better directional stability at cruise speeds. Ed 94 30' Breakaway #3864 30-BS-6B side entry New Cummins 5.9L, 375+ HP Allison 6 speed Spartan chassis K9DVC Tankless water heater | |||
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I do run metric on the front. (225R19.5)Are the tires suspect? As in, DON'T MIX RADIALS AND OLD-STYLE and different sizes front and rear. Autos are different, of course, but I had serious "tail-wag" with an auto years ago due to mis-matched tires front and rear. (I know, it's a stretch, but maybe???) "You are what you drive" - Clint Eastwood | |||
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| 03/22 |
I have radials on front and rear. Bridgestone 225R7019.5 were really bad on the front! There was virtually no difference with Michelin 8R19.5 and Michelin 225R7019.5, the 225R7019.5 are better and I also have no tire rub which I do with the larger diameter 8R19.5! I haven't tried Goodyear yet and as I mentioned still looking for some wheel manufacturer to make me a set of 7 3/4" wide wheels 6 bolt Budd style,and then I would go to 245R7019.5 "G" rated tires Ed 94 30' Breakaway #3864 30-BS-6B side entry New Cummins 5.9L, 375+ HP Allison 6 speed Spartan chassis K9DVC Tankless water heater | |||
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| First Month Member 11/13 |
Hmmm.........Considering the limited suspension travel, do you think a Watts linkage would be worth the trouble on a P30 chassis? It is a lot more work than a Panhard bar. Oh, BTW, have you tried other tires on the back? I don't know how much this applies, but two of my three P30s came with Michelins, which seemed to have a lot of sidewall flexibility. A lot of the tail-wagging went away when I switched. Steering improved, as well. . 84 30T PeeThirty-Something, 502 powered | |||
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| 4/08 |
Just a comment on radial tires. To much air pressure will make them drive like you were on ice. I have had a couple of cars that after getting serviced I had to lower the tire pressure. On the Barth I run the no more than the recommmeded tire pressure. '92 Barth Breakaway - 30' 5.9 Cummins (6B) 300+ HP 2000 Allison Front entrance | |||
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It is interesting reading the following posts. As some of you remember, we bought a Champion Ultrastar last year with an Oshkosh chassis. It is a 33' diesel pusher puwered by a Cummins 5.9 and Allison AT 540 trans. We just completed our winter travel of almost 5000 miles and yes, we still had to follow it all over the road. It seems that with a solid front axle, a panhard bar is a good choice as well as replacing the bushings in the leaf springs with polyurethane bushings. That will tighten up the front end and make tracking much better. The Davis Tru Trac is what was recommended and it is a bolt on application. We are being affected by the the wonderful republican economy now and must sell our motorhome as we don't plan to travel for awhile as business is down due to gas prices. Just in case anyone might be interested, you can see my ad in Craigslist at. http://minneapolis.craigslist.org/rvs/632788947.html I won't bore you with details. It's a real nice unit and well constructed. Terry | ||||
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| 2/16 Captain Doom  |
I just replaced the front tires on StaRV II (early April); the Kellys on there handled well, but one developed a 2" sidewall blister, so they were gone. I was in MS at the time, and my host recommended a tire store, and they recommended Wanli (Chinese - PRC). I was a bit skeptical, but now with 2,800 miles on them I'm confident in the tracking and handling; I think they're actually a bit better than the Kellys, and I've always been a Kelly fan. On the web, the reviews on the car tires are mixed, but the truck tires are well-regarded. The ride is a bit harsher, but my Breakaway rides like a buckboard, now just a slightly worse buckboard (but still better than my 1-ton van...). I think Champios are sleepers - I looked at a Furon a friend had for sale, and it was squeak- and rattle-free, but its handling was squishy. Rusty  "StaRV II"'94 28' Breakaway: MilSpec AMG 6.5L TD 230HP Nelson and Chester, not-spoiled Golden Retrievers Sometimes I think we're alone in the universe, and sometimes I think we're not. In either case the idea is quite staggering. - Arthur C. Clarke It was a woman who drove me to drink, and I've been searching thirty years to find her and thank her - W. C. Fields | |||
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| First Month Member 11/13 |
Have you tried Stockton Wheel? . 84 30T PeeThirty-Something, 502 powered | |||
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| 03/22 |
Interesting that you mention them! I have just contacted them last week, there only 1 hour away from me. They haven't gotten back to me with a quote but they said they should be able to make a 7,- 7 3/4 inch wide wheel with a 6 bolt Budd style pattern. They had a concern about weight but when I told them it was a RV they were OK with that, I am under the load rating for the 6 inch wide wheels so making wider wheels should be in line with my load requirement as well. Thanks for the reminder and tip. Ed 94 30' Breakaway #3864 30-BS-6B side entry New Cummins 5.9L, 375+ HP Allison 6 speed Spartan chassis K9DVC Tankless water heater | |||
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