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Old 06-01-2012, 11:09 AM   #15
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Quote:
Originally Posted by GetOutDoors View Post
Porpoising happens when less-then-perfect roads cycle (on and off) more weight to a given location then the suspension is adequately capable to support. So you have two real general choices of resolution: distribute the weight so it is not concentrated in one location (which is what we are trying to do with weight distribution bars), or modify the suspension such that it can handle the weight. I guess you could say there is a third choice: don't drive where the road are less than perfect.
BINGO!! I agree.
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Old 06-02-2012, 12:31 AM   #16
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[QUOTE=GetOutDoors;1152980]Porpoising happens when less-then-perfect roads cycle (on and off) more weight to a given location then the suspension is adequately capable to support. So you have two real general choices of resolution: distribute the weight so it is not concentrated in one location (which is what we are trying to do with weight distribution bars), or modify the suspension such that it can handle the weight. I guess you could say there is a third choice: don't drive where the road are less than perfect.


I agree with the last sentence, only.

doug k
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Old 06-02-2012, 12:46 AM   #17
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Doug, tough to do in WA State.
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Old 06-02-2012, 01:00 AM   #18
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Hi, all the adjustments, or modifications, to your vehicles can't change the shape of the roads you drive on.
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Old 06-02-2012, 06:29 AM   #19
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Cut and pasted from another thread on a similar subject:

"We have towed our 19-foot Bambi from Phoenix to the SF Bay Area numerous times with both a 3/4 ton Chevy crewcab with a long wheelbase and a 1/2 ton Tundra CrewMax with a short bed. The stretch of I-10 between Indio and LA is really bad with harmonic dips that get both rigs bucking like a bronco. I don't think switching tow vehicles will help much; the real problem is the roadway. We now take some parallel side highways that are much smoother to avoid this stretch."

There is a lot of discussion on truck forums, too. It's not the tow vehicle suspension or shocks, or the hitch, or the weight distribution in the trailer; it's the roadway. The old concrete slabs sag in the middle and pitch up at the joints; and when the frequency (speed) of the tow vehicle and trailer match the length between the joints, random bouncing becomes harmonic porpoising. The only way to reduce this effect is to speed up or slow down to reduce the harmonic oscillation. This will not stop the bouncing, only reduce the magnifying effect. Or, use another route until road crews grind down the high spots at the joints or repave with asphalt.
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Old 06-05-2012, 09:35 AM   #20
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Quote:
Originally Posted by danlehosky View Post
Doug, tough to do in WA State.
Dan
LOL ... but, wait until you hit MT ... even worse ... NOT LOL ...
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