[SEL] RE: SEL Digest, Vol 12, Issue 10

[bill at antique-engines.com]

Yes - pulling clear up kills it, lowering it advances it.
The impulse does indeed retard it as well as give a sudden "twist" to
increase spark during starting.
However, the electric start on my F20 can spin it so fast the impulse
kicks out, making it hard to start, so you simply tap the start button
enough for about 1 revolution, then it's running. (12v battery, 6v
starter)

Bill

My F-20 has automatic impulse, but the timing was controlled by the points
> which changed when the lever was moved up or down...
>
>>From Andrew at
> tech at andrew2.netpluscom.com
> engineering at andrew2.netpluscom.com
> b10730 at hotmail.com
>
> Visit the website at http://www.netpluscom.com/~10730/
> http://www.oldengine.org/members/andrew/
>
> On Thu, 10 Mar 2005 bill at antique-engines.com wrote:
>
>> You can't even flat out make a "rule" as to number of cylinders or size
>> of
>> engine as the single cylinder LA had an impulse, did it not?
>> But the single FB, the Associated, etc. with rotary did not.
>>
>> MY F20 has an automatic impulse.
>> My regular had a manual set impulse.
>>
>> Bill
>>
>> > The old IHC Type L magneto on low-tension M engines contains no
>> impulse
>> > or retard mechanism. Lots of small aircooled engines have had flywheel
>> > magnetos with no impulse or retard.
>> >
>> > John
>> >
>> > On Mar 10, 2005, at 2:17 PM, Andy Glines wrote:
>> >
>> >> I can't think of any type of rotary mag which does not impulse even
>> on
>> >> my 1cly Wisconsins.
>> >
>> >
>> > John Culp
>> > Bristol, Tennessee, USA
>> >
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>> >
>>
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