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Old 04-20-2019, 06:43 PM   #1
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Porpoising

So there are stretches of road that at 65 mph create a severe porpoising effect. I can slow down and it settles down some but is this normal ? I know my coach is 15 years old but it has low mileage at 25,000 and has been stored indoors most of it's life. I can't believe the shocks would be bad already. I have 8 airbags and the gauge generally shows around 110 psi when going down the road.
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Old 04-20-2019, 07:19 PM   #2
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Hi Spdracr39; Verry interesting. Not an expert but have had 2 Monaco Windsor's over the last 15 years and can say I have not experienced your problem. I had a 32' and now a 34' Windsor, both with the 8 air bag suspension. Your longer wheelbase should smooth out the ride better that my shorter wheelbase. Could be you have just the perfect combination working not in your favor. Even with the low mileage on your Beaver, your shocks still might not be doing their job as intended too. I would do a physical check of your shocks and air bag ride height valves and linkage to make sure everything looks in place. To me the shocks should be controlling the rebound after the suspension compresses. I have hit some big dips at 65 and the front goes down, but returns right where it was before the dip. No porpoising! Hope someone here with you coach and same length will respond so you can get a comparison. Hope some of this info, my opinion on you problem, helps!
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Old 04-20-2019, 07:48 PM   #3
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Time for shocks, without a doubt.
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Old 04-21-2019, 04:48 AM   #4
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Quote:
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Time for shocks, without a doubt.
X2
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Old 04-21-2019, 06:54 AM   #5
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I had the same problem. The factory shocks are a tad too mushy so I swapped them out for Bilsteins. I leave on a trip on Wednesday so Iíll be able to give a more complete review but so far, it seems like the new shocks have solved the problem without making the ride too harsh.
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Old 04-21-2019, 07:06 AM   #6
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Your coach should only bounce one cycle when you hit a bridge or dip. X3 on the shocks. The only exception is the New York State Thruway west of Syracuse. They just redid the cement roadway and each section appears to be crowned the wrong way such that it matches the natural frequency of my suspension and I got non-stop porpoising. I had to get off the highway.

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Old 04-21-2019, 07:22 AM   #7
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This particular stretch of road is more like a series of dips that seem to hit a harmonic with the suspension. When there is only one dip it performs as expected. It is possible I am just expecting too much and it is probably normal for this scenario. I guess to clarify my query I am really asking if those that have otherwise good ride quality ever experience these conditions occasionally. I am new to the class a world and don't really know where to set my expectations lol.
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Old 04-21-2019, 07:23 AM   #8
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Your coach should only bounce one cycle when you hit a bridge or dip. X3 on the shocks. The only exception is the New York State Thruway west of Syracuse. They just redid the cement roadway and each section appears to be crowned the wrong way such that it matches the natural frequency of my suspension and I got non-stop porpoising. I had to get off the highway.

Walt
This is exactly what I am talking about. Thanks
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Old 04-21-2019, 09:47 AM   #9
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My coach had a bad case of Porpoising the day it was new. I replaced the shocks the second year at 12,000 miles. Should have done it sooner. The OEM shocks were just not enough to control the Porpoising. I replaced them with KONI FSD shocks and while expensive they work great and no more Porpoising.
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Old 04-21-2019, 09:56 AM   #10
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Don't know what year Monaco started installing Monroe shocks, but if you have them, they very well may be shot at 25000 mi !
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Old 04-21-2019, 10:14 AM   #11
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Quote:
Originally Posted by spdracr39 View Post
I guess to clarify my query I am really asking if those that have otherwise good ride quality ever experience these conditions occasionally.
Yes!

Think the only thing that would smooth out the conditions you describe would be a 40' magic carpet !
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Old 04-21-2019, 06:31 PM   #12
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Thereís a bridge on the 101 in Ventura that has the bad bounce as well. Even with an automobile itís bad. As long as it doesnít porpoise after a single bump you are good, nothing you can do about a poor road.
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Old 04-21-2019, 10:52 PM   #13
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I have a 98 Beaver Ticonderoga which porpoises on occasion, particularly if the roadway before or after a bridge has subsided. I have the original Bilstein shocks. I tested the shocks and they are still as firm as when new. I have 8 airbags as well. Having read other threads about porpoising, I now just keep a good eye out and slow down when I see one of those spots coming.
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Old 04-22-2019, 06:13 AM   #14
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We also have a 2004 (Camelot) and it did the same thing all the way home. First big job I did was change all the shocks (8). Night and day difference. I used Bilstein's.
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