[Mgs] Pertronix Flame Thrower distributor

[Henri Lefebvre]

I sent a query to Pertronix regarding the mechanical advance.
Pertronix confirmed that the Flame Thrower distributor for MGB's has
the following mechanical advance curve:

Engine RPM        Advance, Crank Degrees

 600                    2 degrees
 710                    4
 820                    6
 940                    8
1100                  10
1300                  12
1550                  14
1780                  16
1900                  18
2300                  20
2610                  22
3050                  24

Henri




2009/6/10 Eric Markley <ericemarkley at bellsouth.net>:
> 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 at autox.team.net [mailto:mgs-bounces at autox.team.net]On
> Behalf Of Henri Lefebvre
> Sent: Wednesday, June 10, 2009 11:39 AM
> To: mgs at 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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