Hello Henri,
Your '71 should have a GK series engine that used manifold vacuum. I would
set the timing dynamically at 35 degrees BTDC at 3000 to 3500 rpm and then
verify that the timing at idle is in the 10 to 15 degree BTDC range. Vacuum
advance should be disconnected while adjusting the timing. You may need to
adjust the timing a little depending on the quality of the gas you can buy
to avoid detonation. I have heard anything from 31 to 38 being used to get
best results; each engine is unique. Too little and too much advance are
both bad. If it starts well when cold, pulls strongly to 5000 or so, and
does not ping or overheat, you are close to the best timing.
Hope it works out well.
Eric in Florida
'74 B
-----Original Message-----
From: mgs-bounces@autox.team.net [mailto:mgs-bounces@autox.team.net]On
Behalf Of Henri Lefebvre
Sent: Wednesday, June 10, 2009 11:39 AM
To: mgs@autox.team.net
Subject: [Mgs] Pertronix Flame Thrower distributor
I recently installed a Pertronix Flame Thrower distributor in my 71 MGB GT.
http://www.mossmotors.com/SiteGraphics/Pages/flamethrower/flamethrower.htm
l
For proper ignition timing purposes, would anyone be abIe to provide
the following information:
1 - Distributor mechanical advance of this distributor: 10 degrees?
or 20 degrees? or other?
2 - Vacuum advance: connection to manifold? or carburettor?
3 - Recommended Ignition Timing, based on the above and engine year?
All and any information and recommendations welcomed.
Thank you,
Henri
1971 MGB GT
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