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Re: JC-4 vacuum pump observations [message #327931 is a reply to message #327871]

Sat, 06 January 2018 20:00

RF_Burns

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

Karma:

Senior Member

Thanks Ken,I was sure I read something about a mod. I took a look at the sensor this afternoon. It appears to have a magnetic plunger with 3 electrical terminals so likely a Hall-Effect sensor to the plunger. I think a better idea would be to bypass the existing electronics and power the motor with a vacuum switch operating a relay.

I bypassed the controller to power up the motor and measured the max vacuum at just a tad under 20". I also confirmed from the circuit board that the motor is powered from pin B. I used a hose to the vacuum gauge, so I'm not sure how long it will take to pump down a booster.

just my findings.

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 observations By: RF_Burns on Sat, 06 January 2018 09:50
		Re: [GMCnet] JC-4 vacuum pump observations By: Ken Henderson on Sat, 06 January 2018 11:59
		Re: JC-4 vacuum pump observations By: RF_Burns on Sat, 06 January 2018 20:00

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