On 07-Aug-97, Bill Woodruff wrote:
>At 10:01 PM 8/6/97 -0700, Mark Stahlke wrote:
>>distributor on my '71 TR6. Here's the story:
>> I recently replaced my dual vacuum capsule distributor with a rebuilt all
>>mechanical advance unit from TRF
>>the carbs (dual Weber DGVs). I discovered that the vacuum retard switch on
>the
>>throttle linkage had been bypassed. The vacuum retard is connected
>directly to
>> What is the vacuum retard doing to my timing? Do I need it at all?
>The vacuum retard switch is an emissions control device. Your car was
>designed to meet an idle emission standard. Triumph did this, in part, by
>retarding the ignition timing at idle. As you are probably aware, the base
>ignition timing and advance curve greatly influence engine power output.
>Thus Triumph designed the vacuum switch system in the throttle linkage to
>dump the ignition retard and return to a more 'normal' base timing as soon
>as the throttle was opened. Later cars have a similar retard system,
>however they eliminate the switch by using ported vacuum from the
carburetors.
>Since your new distributor has only a mechanical advance, the vacuum system
>is already completely bypassed; you can eliminate all the associated parts.
> My car is supposed to have a similar system, but it is long gone. If you
>want to get rid of the switch, I would be interested in it.
>William Woodruffwoodruff@fail.com
>San Francisco, CA
Thanks for the info. I'd be happy to send you the throttle linkage vacuum
switch if you want it. I have to warn you that it is not in good condition and
does not seem to work.
Mark
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