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Re: JC-4 Vacuum Pump?? [message #364212 is a reply to message #323858]

Sun, 23 May 2021 13:45

RF_Burns

Messages: 2276
Registered: June 2008
Location: S. Ontario, Canada

Karma:

Senior Member

I posted this about a year ago on the operation of the JC-4 vacuum pump. Its not a great pump, about 8-9" of vacuum is all you can expect from it.

I bypassed the internal circuitry so now it only acts as a vacuum pump. Then I wired it through a relay controlled by Dave Lenzi's vacuum switch assembly. Best I can get is about 15" of vacuum. Not great but better than nothing.

http://www.gmcmhphotos.com/photos/data/6785/JC-4_vacuum_pump_operation.pdf

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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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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