[DeTomaso] Pantera A/C compressor bracket

[Julian Kift]

I couldn't find any real published data either, the indicative answer I came up with from various sources was;

 

Low RPM; electric pump flow rate is full (or temp controled) rate so better cooling (i.e. where most Pantera's seem to suffer in traffic)

Mid Range; About equal flow between mechanical and electric - implying that mechanical pumps rated gpm is established at mid range rpm

High RPM; The mechanical pump is capable of flowing more, but the limitations and flow rate of the system as a whole becomes a factor. Mechanical pumps can suffer from cavitation.

 

Then there is the mechanical pump rpm vs. engine rpm depending whether you are running std ratio pulleys, overdrive or underdrive. And of course whether you are dealing with a marginal overall cooling system and radiator.

 

Some sources do seem to advocate having both a mechanical and electric water pump in the system, the electric acting as a booster to the mechanical. 

 

For my install in the GT40 the objective is to get a flat firewall so the driver seating position is improved. Similar secondary objective in the Pantera, but primary objecvtive there is keeping a half blocked 625HP motor cool and operating at optimum T.

 

I won't argue that for sustained Autobahn or ORR speeds/rpms that a mechanical pump may still be the best solution. Of course a 3.77 ring & pinion and tall 5th also help to bring rpms to less strenuous levels.

 

I may have to rig up a mechanical water pump and some buckets........ 

 

Julian
 
> From: kirby.schrader at gmail.com
> Date: Sat, 28 Nov 2009 12:02:20 -0600
> To: asajay at asajay.com
> CC: detomaso at realbig.com
> Subject: Re: [DeTomaso] Pantera A/C compressor bracket
> 
> 
> I tried to find info on mechanical pump flowrates... Nobody seems to publish it. Or, at least, that I could find.
> 
> Besides, the mechanical pump is pumping the least at low rpm. My car didn't get hot at speed.
> Just soaking in the traffic in Texas 100degF heat. It doesn't do that any more.
> 
> 
> On 28 Nov 2009, at 11:42 AM, Asa Jay Laughton wrote:
> 
> > Hmm, well Kirby, I think you're going to have to enter the Big Bend Open 
> > Road Race this next year in order to test it at ORR speeds for extended 
> > periods of time "autobahn style" in order for us to really know.
> > 
> > But in seriousness, I think Jack's question is the most relevant. What 
> > is rated capacity of a stock mechanical pump being driven by a belt at 
> > 6,000 engine RPM. If we knew that number, we could do a side by side 
> > comparison of the electric which we know has an advertised capacity of 
> > 55 GPM. After that, empirical testing is required.
> > 
> > Asa Jay
> > 
> > Asa Jay Laughton, MSgt, USAFR, Retired
> > 
> > & Shelley Marie
> > Spokane, WA
> > 
> > 1971 Mach I Mustang [ASA JAY]
> > 1973 Pantera L 5533 [ASASCAT]
> > 
> > ****************************** 
 		 	   		  
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