[Healeys] Tech Session at Conclave re: timing

[Michael Salter]

I have a wonderful book on engine technology from Repco, of Repco Brabham
fame. This book goes into ignition timing theory very extensively and
taught me that the only way to really set ignition timing correctly is
through many hours of dynamometer testing through the complete range of
engine speeds and load settings.
As someone mentioned "silent ping" or resonance can be a killer of engines
and only through exhaustive testing can such issues be eliminated.

M

On Wed., May 26, 2021, 7:59 p.m. Michael Oritt via Healeys, <
healeys at autox.team.net> wrote:

> Richard--
>
> One method of "Old School" tsetting timing (at idle) is to put a glass of
> water on the valve cover and adjust the timing until the surface of the
> water is smooth and free of ripples.  Aside from the fact that the valve
> cover on Healeys is not flat I question what a smooth idle has to do with
> WOT or high-end performance, but it does sound charming.  Another is to
> retard until pinging occurs but I have heard and read that there is
> something called "silent pinging".
>
> When I set timing on my 100 I do it at high rpm's (2500 to 3000) with a
> light and look for 34-35 degrees of advance.  Anything beyond that causes
> my engine to overheat and sometimes I will take a degree or two off that if
> engine temps suggest.
>
> Best--Michael Oritt
>
>
> I have heard (not seen) people
>
> On Wed, May 26, 2021 at 5:16 PM John Vrugtman via Healeys <
> healeys at autox.team.net> wrote:
>
>> way I used to do that was advance timing and test drive lugging in high
>> gear, when pinging started, it was time to retard slightly to avoid
>> pinging.  Worked fine.
>>
>> JAV
>>
>> On 5/26/2021 4:08 PM, richard mayor wrote:
>>
>> Some additional info for you listers about my post.  I do in fact have a
>> timing light. I actually have two.  Please do not reply to me and tell me
>> what the factory spec is or what the total advance should be or anything
>> else you assume I don't know.  I simply have a keen interest in knowing
>> about "old school"  techniques and how to apply them.
>>
>> On Wed, May 26, 2021 at 11:10 AM richard mayor <boyracer466 at gmail.com>
>> wrote:
>>
>>> There was a discussion at the Conclave tech session about ignition
>>> timing..... advancing the distributor to a certain point and then backing
>>> off a certain amount..... without using a timing light.  I cannot remember
>>> the specific details but I would like to try it.  Does anyone have the
>>> exact details of the procedure?
>>> Thanks,  Richard
>>>
>>
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>
> --
> Best--Michael
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