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Re: 69 B tuning -- what are we missing here?

To: MG List <>
Subject: Re: 69 B tuning -- what are we missing here?
From: Max Heim <>
Date: Tue, 11 Sep 2001 09:40:30 -0700
Yeah, we had the air cleaners off so we could see the pistons react. We also
had the SU tuning kit with the tubes and rods stuck into the top of the
pistons to gauge the smallest movement.

on 9/11/01 5:04 AM, Chris Kotting at wrote:

> Max -
> Have you checked that the pistons on both carbs are moving freely?  I
> had similar troubles when one piston got hung up.  Fortunately it was
> easily rectified, but until I check the piston movement, I had no clue
> as to the problem.
> Chris K.
>> Date: Mon, 10 Sep 2001 12:11:24 -0700
>> From: Max Heim <>
>> Subject: Re: 69 B tuning -- what are we missing here?
>> Well, due to the "hidden" timing marks we had originally set it at around 15
>> degrees advanced (as it turned out). It wouldn't accelerate in this mode, so
>> we tried cranking the vernier all the way advanced (still no go) and
>> retarded (nope). That's when I felt around underneath the pulley and found
>> the degree pointers. At that time we were around 12 degrees advanced. So we
>> loosened the distributor clamp and brought it around to 10. This let us
>> reset the idle, so we went through the carb setup again.
>> So we've basically tried a wide range of timing settings (I would say from
>> about 5 to almost 20 degrees advanced). It seems to me it must be something
>> else.
>> I have heard of the harmonic balancers separating so that the timing mark is
>> off, but the engine idles so well it's hard to believe it can be seriously
>> wrong.


Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.

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