Four different distributors I have for 4 cyl and V8 B's all have one thin
and one thick spring, the thin spring is under tension on its pegs whereas
the thick spring has some play - i.e. the weights will have to move out a
little before it takes effect.
One of the dizzies I have has a very much lighter spring than the other. I
dynamically adjust the timing to 8 degrees BTDC then checked the static
timing and found it was about 2 degrees *A*TDC. This does seem to confirm
to me that the light spring controls advance at low rpm and the heavy spring
controls advance at higher rpm, and gives relatively retarded timing for
starting as opposed to running.
PaulH.
http://freespace.virgin.net/paul.hunt1/
-----Original Message-----
From: Bill Eastman <william.eastman@medtronic.com>
To: mgs@autox.team.net <mgs@autox.team.net>
Date: 08 July 1999 15:56
Subject: Dizzy springs, MG sightings
>Well, I have seen one brave fellow who offered up an opinion on why
>distributors have two sizes of springs. His was the explanation that I
>have heard many times before- that the light spring controls the advance
>at low rpm while the heavy spring kicks in at high rpm. Until a few
>days ago, I too subscribed to this belief...
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