Frame Stiffing to reduce Porpoising?
Got a question for you seasoned drivers with older rigs. I have a 1999 F350 Dually Quad Cab Long Bed. I've been driving it for thousands of miles and for the most part, it's been fine. However, while ...
Forum Discussion
It’s pretty evident the OP is only looking for affirmation from someone (not likely to find that person) who has beefed up their frame for an issue that may not be and likely is not an issue.
The rest of the discussion is, frankly, deaf ears.
But a very important point that maybe scooby just brought up is the amount of movement in the overhead portion that we ALL see from time to time with big TCs is not necessarily indicative of excessive frame flex, nor is porpoising. Unless it’s literally a rocking horse most or all of the time. Which is more likely suspension and shocks. Given the camper weight and configuration changing is not an option.
This has been discussed before. And some folks, who don’t regularly drive big heavy pickups, don’t realize that a good portion of the effect is the vehicle and road configuration.
Anyone who gets porpoising on concrete roads, it likely ain’t the camper as equally spaced contraction joints are still pretty common and they often create a harmonic movement.
Being in the industry, the state of NM about 25 years ago began constructing concrete pavement with randomly spaced contraction joints. I did a stretch of I-40 like that and the result was it wholly eliminated that sensation in vehicles that are susceptible to it.
The reason it happens is cut or cracked edges of concrete swell after they’re cut or cracked. So 1000s of evenly spaced little bumps is what causes that sensation or movement.
The rest of the discussion is, frankly, deaf ears.
But a very important point that maybe scooby just brought up is the amount of movement in the overhead portion that we ALL see from time to time with big TCs is not necessarily indicative of excessive frame flex, nor is porpoising. Unless it’s literally a rocking horse most or all of the time. Which is more likely suspension and shocks. Given the camper weight and configuration changing is not an option.
This has been discussed before. And some folks, who don’t regularly drive big heavy pickups, don’t realize that a good portion of the effect is the vehicle and road configuration.
Anyone who gets porpoising on concrete roads, it likely ain’t the camper as equally spaced contraction joints are still pretty common and they often create a harmonic movement.
Being in the industry, the state of NM about 25 years ago began constructing concrete pavement with randomly spaced contraction joints. I did a stretch of I-40 like that and the result was it wholly eliminated that sensation in vehicles that are susceptible to it.
The reason it happens is cut or cracked edges of concrete swell after they’re cut or cracked. So 1000s of evenly spaced little bumps is what causes that sensation or movement.
