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  #11  
Old 10-29-2017, 10:29 AM
White Stripe White Stripe is offline
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If you still have a 2f in your 40 you can get a 2f ac compressor and bracket from a fj60. I use a fj60 ac compressor on my 2f for compressed air. If I idle up the motor I can run impact guns and all that. I do oil it about twice a year.
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  #12  
Old 10-29-2017, 11:01 AM
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Originally Posted by White Stripe View Post
If you still have a 2f in your 40 you can get a 2f ac compressor and bracket from a fj60. I use a fj60 ac compressor on my 2f for compressed air. If I idle up the motor I can run impact guns and all that. I do oil it about twice a year.
Thats what I ran on my F also. Brackets ste very easy to make. The hardest part is sourcing the double crank pulley and thats not that hard.
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  #13  
Old 10-29-2017, 01:14 PM
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Let me know if you want help making mounting brackets and such!
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  #14  
Old 10-30-2017, 01:50 PM
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Rezarf Rezarf is offline
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So here are some numbers from the twin compressor right out of the box.

Tire was a Goodyear Wrangler MT/R in 35x12.5 R15 that measures closer to a 34" fwiw.

I aired down to 20psi with my ARB quick deflator... verified with another gauge. I aired up to 35psi since that is what I usually run, I did note the time for 32psi as well.

Trial 1:
  • Time 3:46
  • Cylinder head temps before and after test: 47*/63*
  • Raised the RPM via the choke.

Trial 2:
  • Time 4:38
  • Cylinder head temps before and after test: 70*/75.5*
  • 20-32psi was hit at 2.44
  • No RPM raised, just under idle.

Trial 3:
  • Time 4:21
  • Cylinder head temps before and after test: 82.5*/97* (noticing some heat soak)
  • 20-32psi was hit at 2.51
  • Raised the idle half way through.

The compressor was hardly warm to the touch but my Snap-On laser thermometer doesn't lie the hottest part of the entire setup after inflating three 35's was the rubber hose at 139*... all that to say I think that airing up four 35 inch tires with this compressor is well within its duty cycle. Now, if I mount it underhood, then the starting temps are gonna be WAY higher than the initial 49* start temps, but if I double these up, and cut the times in half I should be able to get all four done with no breaks.

A few things to note:
  • These were ideal conditions for a compressor, starting cold.
  • The air chucks are pretty lame and I bet I can free up some CFM with a better valve chuck.
  • Upgrading the wiring can ONLY help these little guys run. I am thinking a heavier gauge wire direct to battery via a relay.
  • They are noticably quieter than other "emergency" pumps.
  • The on board guage was pretty dead on at 20psi but I needed to run them to an indicated 40psi to achieve the true 35psi.
  • They have a lot of metal in them for their diminutive size. They "feel" heavy for their footprint.

So if my average with one pump is a conservative 4:30 run time, adding a second one with the correct plumbing and wiring should knock me down to a little over 2 minutes a tire...

Really two questions remain:
1. Will they hold up to the vibrations and conditions of a trail truck.
2. Can they handle the duty cycle needed if they are mounted under-hood and start with temps well above ambient temperature.

I aim to find out.

Total invested thus far: $58
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  #15  
Old 10-30-2017, 02:46 PM
SteveH SteveH is offline
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Great writeup - thanks. I would think that underhood mounting would shorten their lives significantly.
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  #16  
Old 10-30-2017, 03:27 PM
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Rezarf Rezarf is offline
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Do I need to install a check valve per compressor befor tying the air lines or can I tee them together then add one check valve?

Steve I agree.
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  #17  
Old 10-30-2017, 04:09 PM
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Quote:
Originally Posted by Rezarf View Post
Do I need to install a check valve per compressor befor tying the air lines or can I tee them together then add one check valve?

Steve I agree.
Imagine of check valves like diodes (which is ironic because you usually have to explain that diodes are like check valves). You'd need one on each compressor before it feeds into the manifold. The point is to prevent each compressor from being pushed backwards or trying to start under pressure (which is the point of an unloader, the motor and compressor don't have to fight pressure during start). With a tank and two similar compressors it may work just to tee them but it's not going to hurt to use check valves or unloaders. You could sequence the compressors and only use one check valve on the secondary compressor.
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Last edited by DaveInDenver; 10-30-2017 at 04:31 PM.
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  #18  
Old 10-30-2017, 09:36 PM
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Inukshuk Inukshuk is offline
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Why not save all the grief and just mount two compressors and run two hoses?
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  #19  
Old 10-30-2017, 09:45 PM
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Quote:
Originally Posted by Inukshuk View Post
Why not save all the grief and just mount two compressors and run two hoses?
Airing two tires at once still effectively cuts your fill time in half!
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  #20  
Old 10-30-2017, 10:04 PM
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Corbet Corbet is offline
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Quote:
Originally Posted by Inukshuk View Post
Why not save all the grief and just mount two compressors and run two hoses?
Now that kind of logic just takes the fun out of this.
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