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Maderita
Senior Nomad
Posts: 634
Registered: 12-14-2008
Location: San Diego
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I have a Viair 400P, portable, 33% duty cycle.
Also a Viair 350C Continuous (100%) duty cycle, mounted inside a "fat 50" ammo can for portability.
Great units. If you must rely on your compressed air system, it dosen't pay to go cheap.
With regard to "Shell Island", I'm assuming that you plan to drive down the sand spit and have 4x4?
If you have a light SUV/Jeep? light truck with oversize tires, then you might get by with 16 psi in your tires on the sand. If you are returning to
San Felipe, I don't see any problem with driving the few miles on pavement at that pressure. I'd just air up at the PEMEX in SF. Limit speed to 45
mph.
If you bog down in the sand at the higher (16 psi) pressure, then try 12-14 psi. If that doesn't do the job, then there is something wrong, and you
should leave. 10 psi is your "insurance" for getting unstuck and getting out of there.
I've driven a few miles of pavement on 10-12 psi, 35-40 mph.
A wise rule of thumb on the Gulf is, "Always remain above the high tide line." I've extracted so many vehicles in SF area that I never have to buy my
own beer!
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David K
Honored Nomad
Posts: 64491
Registered: 8-30-2002
Location: San Diego County
Member Is Offline
Mood: Have Baja Fever
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Quote: Originally posted by Maderita  | I have a Viair 400P, portable, 33% duty cycle.
Also a Viair 350C Continuous (100%) duty cycle, mounted inside a "fat 50" ammo can for portability.
Great units. If you must rely on your compressed air system, it dosen't pay to go cheap.
With regard to "Shell Island", I'm assuming that you plan to drive down the sand spit and have 4x4?
If you have a light SUV/Jeep? light truck with oversize tires, then you might get by with 16 psi in your tires on the sand. If you are returning to
San Felipe, I don't see any problem with driving the few miles on pavement at that pressure. I'd just air up at the PEMEX in SF. Limit speed to 45
mph.
If you bog down in the sand at the higher (16 psi) pressure, then try 12-14 psi. If that doesn't do the job, then there is something wrong, and you
should leave. 10 psi is your "insurance" for getting unstuck and getting out of there.
I've driven a few miles of pavement on 10-12 psi, 35-40 mph.
A wise rule of thumb on the Gulf is, "Always remain above the high tide line." I've extracted so many vehicles in SF area that I never have to buy my
own beer! |
Good advice!
The air pressure can change between tires and between weather conditions, or moisture in the sand.
The deflating is for the dry, deep stuff one must cross to get to the damp stuff covered at high tide. I agree to not stop and turn off the engine
(for shell hunting, etc.) unless you return to the dry sand, and then point your vehicle downhill so there is no big resistance to begin rolling.
My All Terrain tires (or even street tires) work far better in sand (at 15-20 psi) than do 'deep tread' off road, mud terrain, or 3 ply sidewall
tires. They work well only at or below 10 psi.
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kevin_in_idaho
Nomad
Posts: 143
Registered: 12-13-2016
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| Quote: Originally posted by Maderita | I have a Viair 400P, portable, 33% duty cycle.
Also a Viair 350C Continuous (100%) duty cycle, mounted inside a "fat 50" ammo can for portability.
Great units. If you must rely on your compressed air system, it dosen't pay to go cheap.
With regard to "Shell Island", I'm assuming that you plan to drive down the sand spit and have 4x4?
If you have a light SUV/Jeep? light truck with oversize tires, then you might get by with 16 psi in your tires on the sand. If you are returning to
San Felipe, I don't see any problem with driving the few miles on pavement at that pressure. I'd just air up at the PEMEX in SF. Limit speed to 45
mph.
If you bog down in the sand at the higher (16 psi) pressure, then try 12-14 psi. If that doesn't do the job, then there is something wrong, and you
should leave. 10 psi is your "insurance" for getting unstuck and getting out of there.
I've driven a few miles of pavement on 10-12 psi, 35-40 mph.
A wise rule of thumb on the Gulf is, "Always remain above the high tide line." I've extracted so many vehicles in SF area that I never have to buy my
own beer! |
Thanks. I'm not sure where we'll camp at Shell Island as I'm not sure I want to risk anything but yes, we have 4x4. I'll stay up from the high water
mark! If anyone has a suggestion on where to camp out there that's easily accessible, I'd be interested in hearing about it. From what I can tell,
you can camp on the west side and walk over to the other side. We're coming down from SF so doubt we'd go back that way.
Kevin
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healthdetective
Junior Nomad
Posts: 66
Registered: 1-28-2013
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Another vote for Viair. I use this model. Viair 90P
https://www.amazon.com/gp/product/B001MXL71A/ref=oh_aui_deta...
Inexpensive but not cheaply made
“The average man does not want to be free. He simply wants to be safe.” — Mencken
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David K
Honored Nomad
Posts: 64491
Registered: 8-30-2002
Location: San Diego County
Member Is Offline
Mood: Have Baja Fever
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That looks good! A better air chuck, for sure. The MV-50 screws onto the stem so it is not quick to remove. Have you timed how long to add X pounds of
air?
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healthdetective
Junior Nomad
Posts: 66
Registered: 1-28-2013
Member Is Offline
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David,
I have never done a very accurate measurement. I bring up 4 - 245/65/17 tires from 25 lbs to 36 lbs and 2 - 13 inch trailer tires from 25 to 50 lbs
in under 8 minutes total.
“The average man does not want to be free. He simply wants to be safe.” — Mencken
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David K
Honored Nomad
Posts: 64491
Registered: 8-30-2002
Location: San Diego County
Member Is Offline
Mood: Have Baja Fever
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Thanks, I am guessing 8 psi per minute?? 25% faster than the MV-50 maybe? If you remember to next time, clock the time to fill one tire and how many
pounds 11 or ?.
Thanks for the research assistance!
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Barry A.
Select Nomad
Posts: 10007
Registered: 11-30-2003
Location: Redding, Northern CA
Member Is Offline
Mood: optimistic
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I have had a QuickAir II for about 15 years, and it is fast and I like it fine. It ain't cheap, tho----------you get what you pay for, I have always
believed.
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