Gene,
If the distributor is the original 45DE4 Lucas, it should have a vacuum
canister attached in front of the amplifier assembly. The Lucas part number
is 41693 for a Federal spec car and 41695 for a California spec car. There
is a device that restricts the operation of the vacuum advance to fourth
gear (o/d) only.
Your advance curve spec was:
10 degrees BTDC @ 1500 rpm
13 to 17 degrees @ 2000 rpm
28 to 32 degrees @ 3500 rpm
33 to 37 degrees @ 4500 rpm
The only thing I find in my workshop manuals on the Transmission Controlled
Spark Advance is a wiring diagram, nothing on how to test operation. I hope
that others can help.
Good Luck,
Eric
-----Original Message-----
From: Eugene Balinski [mailto:eugeneb@nni.com]
Sent: Sunday, September 20, 2009 8:35 PM
To: Eric Markley; Eugene Balinski; mgs@autox.team.net
Subject: Re: [Mgs] 80 B Timing question
Eric,
From what I have gathered from the other replies that I
received, the distributor is working correctly. Is has a
mechanical advance vs a vacuum advance. I don't remember
timing a mechanical advance disributor before so what I was
noticing seemed weird, but was in fact, correct.
Thanks for the offer of your help. Now I just have to
figure out how to test the OD vacuum advance switch.
Regards,
Gene Balinski
80 B
On Sun, 20 Sep 2009 19:42:40 -0400
"Eric Markley" <ericemarkley@bellsouth.net> wrote:
> Gene,
>
> Unless I'm reading your post wrong, it sounds like things
> are working
> properly. Is there any other info that you can provide?
>
> Eric
>
> -----Original Message-----
> From: mgs-bounces@autox.team.net
> [mailto:mgs-bounces@autox.team.net]On
> Behalf Of Eugene Balinski
> Sent: Saturday, September 19, 2009 11:04 PM
> To: mgs@autox.team.net
> Subject: [Mgs] 80 B Timing question
>
>
> All,
>
> Can someone tell me how the distributor in an 80 B
> with
> OD works with regard to timing ? The reason that I ask
> is
> that the other day when I was checking the timing with a
> timing light, I noticed that the timing mark moves as a
> function of engine speed. The faster the engine speed,
> the
> more advanced the spark. The slower the less advanced.
> The
> vacuum advance was disconnected at the time. This is
> different from other engines that I have timed where the
> timing mark is relatively constant with engine speed.
> Is
> the MG distributor normal, or is there something amiss ?
>
> Also the MG has the OD advance switch. Is there any way
> to
> check it for proper operation ?
>
> Thanks in advance for the help.
>
> Safety Fast,
>
> Gene
>
> 80 B
>
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