Re: dwell

Posted by RAB on July 26, 2005 at 10:00:26 from (195.93.21.100):

In Reply to: Re: dwell posted by Allan in NE on July 26, 2005 at 09:16:58:

Allan,
You wrote "it is a statistic. A measurement."
It used to be a very important measurement for the multicylinder, high revving engines.
Get the points-closed period too short and they would miss at high speed.
The current build up in the coil is an exponential function and needs a certain time to reach a "saturation level". A V8 at 6000 rpms needs to give 400 sparks per second (one per 2.5 milliseconds). The problem was in stretching that old Ketteringham system enough to get points open wide enough quickly enough and closed long enough all in that short time period. The advent of contactless ignition systems was a fantastic advancement for these old engines.
I agree that a tractor engine at 1500 rpm poses little problems (compared with the old RangeRover V8 among others)
Regards, RAB

Follow Ups:

• Re: dwell Allan in NE 10:13:23 07/26/05 (0)

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