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Re: JC-4 Vacuum Pump?? [message #323877 is a reply to message #323858]

Thu, 14 September 2017 16:30

larry.whisler

Messages: 356
Registered: August 2005

Karma:

Senior Member

Richard,

When we were at Blaine's work rally, John Shotwell and I attached
a JC-4 vacuum pump to a vac gauge to check the amount of vacuum
of a brand new pump versus a used pump from the salvage yard.

Both pumps produced 8 psi vacuum based on their internal cutoff switch.

Someone was looking into altering the internal switch to achieve a higher
vacuum. I have no doubt that the JC4 pump could provide an adequate amount \
of vacuum if the switch could be overridden.

The problem my arise at high altitude where the pump would run continuously
because it cannot achieve the required vacuum to turn the unit off.

JMHO

larry

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[Message index]

		JC-4 Vacuum Pump?? By: rjw on Wed, 13 September 2017 21:08
		Re: [GMCnet] JC-4 Vacuum Pump?? By: k2gkk on Wed, 13 September 2017 21:36
		Re: [GMCnet] JC-4 Vacuum Pump?? By: Jerry Wheeler on Wed, 13 September 2017 22:24
		Re: [GMCnet] JC-4 Vacuum Pump?? By: rjw on Thu, 14 September 2017 06:11
		Re: [GMCnet] JC-4 Vacuum Pump?? By: USAussie on Thu, 14 September 2017 07:18
		Re: JC-4 Vacuum Pump?? By: Larry on Thu, 14 September 2017 07:33
		Re: JC-4 Vacuum Pump?? By: Hal StClair on Thu, 14 September 2017 11:31
		Re: JC-4 Vacuum Pump?? By: larry.whisler on Thu, 14 September 2017 16:30
		Re: [GMCnet] JC-4 Vacuum Pump?? By: Ken Henderson on Thu, 14 September 2017 17:55
		Re: [GMCnet] JC-4 Vacuum Pump?? By: johnd01 on Fri, 15 September 2017 00:32
		Re: [GMCnet] JC-4 Vacuum Pump?? By: Ken Henderson on Fri, 15 September 2017 06:10
		Re: [GMCnet] JC-4 Vacuum Pump?? By: GatsbysCruise on Sun, 23 May 2021 12:18
		Re: JC-4 Vacuum Pump?? By: jhbridges on Thu, 14 September 2017 17:12
		Re: JC-4 Vacuum Pump?? By: RF_Burns on Sun, 23 May 2021 13:45
		Re: JC-4 Vacuum Pump?? By: rjw on Sun, 23 May 2021 14:43
		Re: JC-4 Vacuum Pump?? By: RF_Burns on Sun, 23 May 2021 21:01
		Re: JC-4 Vacuum Pump?? By: rjw on Mon, 24 May 2021 06:05

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