| Author | Message | ||
| christopher l cole sr. (Muziklvr)
Registered Member Username: Muziklvr Post Number: 54 Registered: 7-2006 Posted From: 68.119.227.51 Rating: N/A |
what should be the normal operating air pressure on a 1954 gm 4104?is 110-115 lbs to much? | ||
| Tom Caffrey (Pvcces)
Registered Member Username: Pvcces Post Number: 1004 Registered: 5-2001 Posted From: 65.74.65.54 Rating: N/A |
Christopher, get your bus weighed. After you do that, you will have something to work with. The amount of air needed for each coach, even of the same model, is different because the weights can vary by over 5 tons. After you do that, it's a simple matter of looking up your tire maker on the web and seeing what the recommended pressure is for your service. We run over the recommended pressure because of the better fuel economy, but it does make the ride somewhat harder. Fuel aconmy can vary by more than 10%, depending on the pressure you choose. Matching the tires on the drive axle for size, type and pressure usually pays off by lower cost of operation. Good luck with your coach. Tom Caffrey PD4106-2576 Suncatcher Ketchikan, Alaska | ||
| Tom Caffrey (Pvcces)
Registered Member Username: Pvcces Post Number: 1005 Registered: 5-2001 Posted From: 65.74.65.54 Rating: N/A |
Hi, Chris. I just looked over your post and realized that you were asking about system air pressure, not tire pressure. I'm sorry about not answering the question that you asked. System air pressure normally runs around 120 psi. If it needs readjusting, I think you can adjust the compressor governor. If not, it's easy and inexpensive to change. Tom Caffrey PD4106-2576 Suncatcher Ketchikan, Alaska | ||
| RJ Long (Rjlong)
Registered Member Username: Rjlong Post Number: 1056 Registered: 12-2000 Posted From: 67.181.163.170 Rating: N/A |
Tom - Droopy eyelids when you made your initial post?? LOL. . . Christopher - Tom's second post is right on, regarding your question. Air system govenor cut-out should be right about 120 psi, and should cut-in around 90 psi. As you travel, the air pressure will normally fluctuate between these two figures, as you use the brakes and the suspension does it's job. As air's deplenished from the system, the govenor cuts in to allow the compressor to resupply everything. (BTW, Tom's post about tire pressures is good advice, too!) FWIW & HTH. . .  | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 212 Registered: 11-2005 Posted From: 63.97.117.26 Rating: N/A |
Chris, My 4104 manual says 80-105 psi and it maintained this until I had to replace the governor. The new governor which is made for trucks keeps it at 92-102psi. I couldn't find another original type governor. | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 213 Registered: 11-2005 Posted From: 63.97.117.26 Rating: N/A |
Forgot to mention, mine is a '54 also, s/n 1274. What is your s/n? | ||
| christopher l cole sr. (Muziklvr)
Registered Member Username: Muziklvr Post Number: 55 Registered: 7-2006 Posted From: 68.119.227.51 Rating: N/A |
thanks to all(tom on both topics).all info was greatly appreciated!gus,my s# is 1214 | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 219 Registered: 11-2005 Posted From: 63.97.117.50 Rating: N/A |
Chris, Forgot to mention that the reason I don't run it up to 120 psi is because the air system was designed for 105 psi and I figure I'm pushing my luck to run it at 120. |