Search found 6 matches

by Harvey.
Sat Jun 02, 2012 5:40 pm
Forum: Electrical & Gauges Shop
Topic: Can MSD coils be used?
Replies: 1
Views: 1202

Re: Can MSD coils be used?

No you can't use those coils on a point ignition. :) That type for coil needs an electronic control to limit the primary current, to about 4amps. If you used them, the primary current would be, 12V/0.2ohms equals 60amps, or almost a complete short. It would fry the wiring.
by Harvey.
Sun May 20, 2012 5:35 pm
Forum: Electrical & Gauges Shop
Topic: darmah timing
Replies: 17
Views: 5456

Re: darmah timing

Nice one Harvey! And further explained here with some graphs... http://www.megamanual.com/ms2/pickups.htm I'll go and retrieve pickup polarity from the box. Kev Yes Kev that is a good explanation of the use of a 'Zero Crossing ' trigger. This type of trigger has a precise trigger point that is the ...
by Harvey.
Sat May 19, 2012 6:05 pm
Forum: Electrical & Gauges Shop
Topic: darmah timing
Replies: 17
Views: 5456

Re: darmah timing

The mysteries, of flux movement. :) There are two ways that a magnetic pick-up can be used to trigger a circuit. As the rotor moves past the pick-up a voltage is generated, this voltage will increase to a peak, then fall to zero to change to the opposite voltage as the reluctor moves away. The shape...
by Harvey.
Sat Mar 31, 2012 4:03 pm
Forum: Squarecase Early 860/900 Crossover Gearchange Engines > 860/900 GT
Topic: Crossover Pipes
Replies: 6
Views: 4737

Re: Crossover Pipes

The crossover pipe is included to reduce the sound level, letting each cylinder to use both mufflers to reduce the sound. Removing the 'balance' pipe has the cylinders running, with a tuned length pipe, that will allow the sound waves to work to scavenge the cylinders. This needs the carb to be reje...
by Harvey.
Tue Jan 10, 2012 4:36 pm
Forum: Single Cylinder Bevel Drive Engines > 250, 350 & 450
Topic: How does (and should) electronic ignition advance work?
Replies: 11
Views: 5612

450 advance.

Giday Steve. Not easy to show as there is nothing to see. There are two ways of doing it, the Bosch on the later 78-80s CDI has three defined peaks that are different distances away from the pick-up, and can be seen. The 450 pick-up rotor uses the amount of pole that overlaps with the stator pick-up...
by Harvey.
Thu Jan 05, 2012 3:48 pm
Forum: Single Cylinder Bevel Drive Engines > 250, 350 & 450
Topic: How does (and should) electronic ignition advance work?
Replies: 11
Views: 5612

Thanks Kev, I thought the advance should be something like that. Do you know if the advance is controlled electronically inside the transducer or is it something to do with the change in pulse shape from the pickup as the revs increase? I checked the pickup output with an oscilloscope tonight, it p...

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