Compressor cutoff at ____ RPM mod....
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From: Fairfax, VA
Compressor cutoff at ____ RPM mod....
I want to throw this one out there. Since A/C compressors made these days are all dinky units made out of beer cans, has anybody ever wired in a clutch cutoff to keep the compressor from engaging after a certain RPM? All the cop cars used to have W.O.T. switches that were linkage activated to disengage the clutch, giving them full power when needed. In the interest of lenghtening the life of my compressor, I'm pondering the thought of putting a setup on my Screw that doesn't let the clutch engage beyond 2500 RPM's. These newer aluminum units work great, but were never designed to see high rev's. I am the night manager at a jobber parts store and get calls for compressors on 2 year old, and sometimes newer vehicles. That never used to happen with the old heavy iron/steel units. I can't help but think that the smaller units of today are failing earlier due to over-revving. Anybody agree/disagree? In either case, I spoke to a guy in the tech. dept. at MSD, and they have the components available to perform the task I'm talking about. If, however, someone in here has accomplished the same thing in a different way, I'd like to hear about it. Would also help moving these trucks onto the highway a little quicker.
SL
SL
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Joined: Jul 2004
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From: Easton, Pa.
The Navigators have the feature but the rest don't.
I would use a vacuum manifold switch that opens or closes in the 6" or less vacuum range to operate or drop a relay wired in to interuppt the compessor clutch circuit.
Wiring will depend on what truck, model and year.
I would use a vacuum manifold switch that opens or closes in the 6" or less vacuum range to operate or drop a relay wired in to interuppt the compessor clutch circuit.
Wiring will depend on what truck, model and year.
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From: SC
While your at it why don't you install a mercury switch connected to the altenator. That way when you go uphill the altenator will stop charging and put less strain on your motor. You could save gas milage that way too.
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From: Fairfax, VA
Originally posted by cmikee
While your at it why don't you install a mercury switch connected to the altenator. That way when you go uphill the altenator will stop charging and put less strain on your motor. You could save gas milage that way too.
While your at it why don't you install a mercury switch connected to the altenator. That way when you go uphill the altenator will stop charging and put less strain on your motor. You could save gas milage that way too.
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Joined: May 2002
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From: Ocean County,NJ
I wouldnt sweat it , your pcm disengages your clutch at WOT. And if there is any blame for newer compressors failing it would have to be the higher psi R134 runs at compared to R12.
Last edited by Superbeast54; Jan 14, 2005 at 09:03 PM.