Re: M Burning Points - Question from Bob M

Posted by John T on June 02, 2006 at 09:32:18 from (66.244.90.5):

In Reply to: M Burning Points - Question from Bob M posted by Wicksfield on June 02, 2006 at 06:53:38:

Wick, we all had this well covered ad nauseum but it got lost grrrrrrrrrrrrrrr now we all gotta start over.........

We all, including Bob and Bob M and myslef n others, suspected and it appears were correct the reason the points burn up so quickly is cuz you were severly over currenting them.

Since it was lost, heres the basics again, then you can do the math:

1) To avoid premature point burn up you wanna limit their current being switched to around 4 or less amps.

2) At 12 volts that means you need a total primary ignition resistance (coil plus any ballast) of around 3 ohms.

3) The coils primary resistance is measured between its lil + and - terminal so measure it,,,,,then use a ballast of sufficient ohms so it PLUS the coils resistance is 3 ohms or a lil more total.

NOTE if you use a Thermistor, a heat compensating resistor, you need to use what its ohms are at warmed up temperature to perform the calculations above. What it does is to be at lesser ohms when cold for better cold weather starting but then once warmed up its ohms increases so as to limit the points n coil current to that 4 amp or less figure I quoted above.

Get it????????

Let us all know, fun electrical discussion

John T Bloomington, Indiana

Replies:

• Re: M Burning Points - Question from Bob M Wicksfield 09:39:22 06/02/06 (0)

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