Additional details on my 71 MGB GT:
Engine 18GK, total rebuild 1 year ago to spec. except Pistons are +40
and cam is a Piper cam #BBP270 fast road cam.
Distributor: original 41339, replaced by Pertronix Flame Thrower
distributor (mechanical adance listed in post above).
Vacuum advance connected to manifold
Current dynamic timing: 10 degrees at 1000 RPM
The car runs very well with this configuration,
Henri
On Sun, Jun 14, 2009 at 8:05 AM, Brits'n'Pieces (Eric
Frenken)<lists@brits-n-pieces.com> wrote:
> Paul, regarding the 41339, if you set a static of 10 deg and you have an
> *additional* centrifugal advance of 10 deg @ 1,000 rpm (which makes it all
> together 20 deg @ 1,000 rpm), how can you have a strobe of 15 deg @ 1,500
> rpm?
>
> Eric
> http://brits-n-pieces.com
>
> -----Original Message-----
> From: mgs-bounces@autox.team.net [mailto:mgs-bounces@autox.team.net] On
> Behalf Of Paul Hunt
> Sent: Friday, June 12, 2009 4:18 PM
> To: Henri Lefebvre; mgs@autox.team.net
> Subject: Re: [Mgs] Pertronix Flame Thrower distributor
>
> In 71 the engine changed from an 18GK with a 25D4 41339 distributor to an
> 18V
> 584/585 with a 25D4 41370 distributor, so it all depends on what you have.
> The characteristics of these were (all in crankshaft degrees):
>
> 41339:
> Static 10 degrees
> Strobe 15 at 1500 rpm
> *Additional* centrifugal advance over the static figure:
> 10 degrees at 1000 rpm
> 24 at 2800
> 30 at 4600
> Vacuum advance started at 7 in.Hg., ended at 13 in.Hg., giving a maximum 10
> degrees.
>
> 41370:
> Static 10 degrees
> Strobe 16 at 1500
> Centrifugal:
> 20 at 1850
> 35 at 3600
> 41 at 4800
> Vacuum starts at 7, ends at 13, max 6 degrees.
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