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06-27-2013, 05:33 PM
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#1
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Junior Member
Join Date: Jun 2013
Posts: 2
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bumps in the road
I need some help when i hit a bump at high way speed my class A MH starts bouncing front to back any suggestions on what may be causing this,tire pressure is at105 psi
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06-27-2013, 05:35 PM
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#2
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Senior Member
Thor Owners Club Ford Super Duty Owner
Join Date: Apr 2012
Location: Wherever the rig is parked
Posts: 8,092
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Quote:
Originally Posted by steadyhand
I need some help when i hit a bump at high way speed my class A MH starts bouncing front to back any suggestions on what may be causing this,tire pressure is at105 psi
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We would need to know the brand of motor home including chassis manufacturer and type in order to be able to help you. If you put that information in your signature line then you will not need to type it every time.
Oh, and welcome to the forum!
__________________
Bruce Dickson 2013 Thor Challenger 37GT, 5 Star Tune, Safe-T-Plus Steering Control with Air Trim, Roadmaster front and rear Sway Bars, SuperSteer rear Track Bar, Crossfires, 2018 Honda CRV . Full timers since Jan 2012.
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06-27-2013, 06:07 PM
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#3
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Senior Member
Freightliner Owners Club
Join Date: Apr 2002
Location: Pensacola
Posts: 2,728
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Most common cause of porpoising:
Symptom: Porpoising over bumps or uneven roads. Porpoising, aka bouncing, dipping, diving. Vehicle keeps going up and down after you go over a bump. - Worn shocks or struts, or
- Broken or slipped leaf spring - inspect leaf springs and repair or replace as needed.
Of course difference chassis/suspension may have various causes, air suspension, ride height etc...
__________________
Hooligan, Pensacola, Fl -U.S. Coast Guard 1956-1985
2016 Thor Siesta Sprinter 24ST diesel -1972 Moto Guzzi
2008 Suzuki Grand Vitara TOAD
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06-28-2013, 08:39 AM
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#4
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Junior Member
Join Date: Jun 2013
Posts: 2
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it is a 2004 National sea breeze lx 35 ft. on a W22 work horse chassis with a vortec engine
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06-28-2013, 08:50 AM
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#5
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Senior Member
Join Date: May 2013
Location: Delmar, Md.
Posts: 3,720
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Just my opinion here, but for starters i would have to say shocks. Crawl under and with a good flashilght check to see if any of them are leaking, just look for any type of wetness and it will be oily to the touch. Of course check to see if you have any broken springs. If they are all dry, next on my list to consider would be tire pressure and how the load is set up in the rig, maybe to much weight towards the back of the RV along with a full tank of fuel just might cause it to bounce.
__________________
[FONT="Century Gothic"]Douglas M. Morgan RVM96
04 Dolphin 6375 LX W-24 Chassis #434136
"The Journey is our Destination" Delmar, Md. 
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06-29-2013, 06:57 AM
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#6
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Senior Member
Monaco Owners Club
Join Date: Mar 2011
Location: Almond, Wisconsin
Posts: 1,512
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If it does turn out to be shocks don't scrimp buy good ones. Most people use Koni or Bilstein shocks, I like the Bilstein shocks but I hope that doesn't open up a big debate on which is better. Good luck and safe travels.  Jim
__________________
 2006 Monaco Camelot 40 PAQ 400ISL - Toad Jeep Grand Cherokee - DW is the Nagivator. Retired to travel and everything revolves around the price of diesel.
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06-29-2013, 07:40 AM
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#7
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Moderator Emeritus
Nor'easters Club Workhorse Chassis Owner iRV2 No Limits Club
Join Date: Oct 2004
Posts: 30,785
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Welcome to irv2.
Workhorse had problems with porpoising in the front end when traveling over dips in road.
You need to change the shocks and I would do all four.
I have Bilstein's also would probably change to Koni's now to do over.
My tire pressures are 95 front and 85 rears Michelin's. You maybe a little hard riding on your fronts.
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