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MSD GMR PIckup

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nfivesl(at)yahoo.com
Guest

Posted: Wed Sep 20, 2006 6:44 pm Post subject: MSD GMR PIckup

Craig:



This is very interesting.  I read the literature and

it  looks to me that the output signal is like a

signal like you would have from a gear-tooth pickup. 

Like a pulse-signal, not 12V.  This is GOOD because

I'm using a gear-tooth sensor that doesn't seem to be

working.  My tachometer needs this type of pulse.  



The literature says you hook the GMR pickup to a 12V

trigger source and it converts it to a pulse-signal. 

The question I have is:



With points and a coil, where do you clip the GMR

pickup?  The wire from the coil is grouded through a

condensor.  The + wire is a steady 12V from the

battery.  Is there a 12V signal somewhere in this

circuit?  Does the wire plugged into the negative

terminal of the coil to the Points have a 12V signal

when the coil fires?  



Am I out of luck with this device for a coil/points

system?



Thanks,



Scott Laughlin

Getting ready for first engine start.



--- Craig Payne <craig(at)craigandjean.com> wrote:



 	  Quote: 	
		   

 <craig(at)craigandjean.com>

 

 Why not use the MSD GMR pick-up? Electrically

 isolated and easier to use

 than a gear tooth pick-up.=


	


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craig(at)craigandjean.com
Guest

Posted: Wed Sep 20, 2006 7:51 pm Post subject: MSD GMR PIckup

It goes on the wire between the points and the coil. The condenser doesn't

actually ground that lead. Go by figure two in the MSD documentation. You do

have an inductive ignition system, you just don't have a coil per cylinder.

Since you are using William Wynne's dual-points/dual-coil ignition on your

Corvair you will have to clip the sensor to the main ignition coil's lead

(unless you are planning to run both coils at the same time).



Given the many different systems the docs show the sensor hooked up to I

suspect it is fairly forgiving. I can't make out what type of round tach you

are using from the photos on your web site. What kind of signal does it

want? Do you have an optical tach to check it with and get the multiplier

set right?



You are welcome to borrow mine indefinitely - I won't be needing it any time

soon. Send me your mailing or FedEx/UPS address off-line.



-- Craig



craig "at" craigandjean "dot" com

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davgray(at)sbcglobal.net
Guest

Posted: Thu Sep 21, 2006 3:16 am Post subject: MSD GMR PIckup

I had no luck with this pick-up.  I tried two different units with a VDO

tach.

I was not able to get any signal out of the unit.

I did not have a scope but the digital meter should have detected an average

voltage of 2 to 4 voilts if it was doing its job.  This device is supposed

to put out a 12 volt square wave of 1/3 cycle duration, thus the average

expected output.

MSD tech was not able to provide any useful additional information.

SummitRacing was very good about the return.



Gary Ray



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