The Ford Barn

Chris Haynes · 12-02-2012, 02:07 PM

I will be running a Wico magneto. Is there a way to use a vintage Sun Tach and sending unit with a mag?

Jack E/NJ · 12-02-2012, 02:48 PM

Depends on how old the Suntach is. If it doesn't amplify the point signal, probably not. Without signal amplification, the magneto trip circuit will probably be too loaded down by the tach to work. Meaning the magneto won't develop enough fire to properly to start the car. I don't think it'll hurt to try it and see.

Jack E/NJ

4dFord/SC · 12-02-2012, 03:03 PM

Sun transmitter no. 37-A was made for use with 8 cyl. magneto. You might find one on eBay.

Chris Haynes · 12-03-2012, 01:56 AM

Quote:

Originally Posted by 4dFord/SC

Sun transmitter no. 37-A was made for use with 8 cyl. magneto. You might find one on eBay.

Mine will be a for a Banger. The transmitters are out there. My concern is if they will work with a Wico magneto?

BUBBAS IGNITION · 12-06-2012, 02:33 PM

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The problem on a mag is that half the cylinders fire positive and the other half fire negative. The magnets switch the polarity every rotation ...SO the tach will only see the negative hits , the tach ( or transmitter ) would need to be set up for a 2 cylinder and protected with a diode etc.......

12-02-2012, 02:07 PM	#1
Chris Haynes Senior Member Join Date: May 2010 Location: Camarillo, CA and Pine Grove, CA Posts: 2,962	Running a Sun Tach with a magneto. I will be running a Wico magneto. Is there a way to use a vintage Sun Tach and sending unit with a mag? __________________ 1921 Runabout 1930 Tudor Early 1930 AA Speed costs money. How fast do you want to go?

12-02-2012, 02:48 PM	#2
Jack E/NJ Senior Member Join Date: May 2010 Posts: 2,260	Re: Running a Sun Tach with a magneto. Depends on how old the Suntach is. If it doesn't amplify the point signal, probably not. Without signal amplification, the magneto trip circuit will probably be too loaded down by the tach to work. Meaning the magneto won't develop enough fire to properly to start the car. I don't think it'll hurt to try it and see. Jack E/NJ

12-02-2012, 03:03 PM	#3
4dFord/SC Senior Member Join Date: May 2010 Location: Columbia, SC Posts: 1,579	Re: Running a Sun Tach with a magneto. Sun transmitter no. 37-A was made for use with 8 cyl. magneto. You might find one on eBay.

12-06-2012, 02:33 PM	#5
BUBBAS IGNITION Senior Member Join Date: May 2010 Location: SPEEDWAY INDIANA Posts: 4,148	Re: Running a Sun Tach with a magneto. Sponsored Links (Register now to hide all advertisements) The problem on a mag is that half the cylinders fire positive and the other half fire negative. The magnets switch the polarity every rotation ...SO the tach will only see the negative hits , the tach ( or transmitter ) would need to be set up for a 2 cylinder and protected with a diode etc....... __________________ If it Makes Spark, we do it !!!! www.bubbasignition.com [email protected]