It is a lot easier looking at the emission problem from 45 years away. At
the time is was a disaster for everyone.
*Never be beaten by equipment.*
On Sun, Jan 12, 2014 at 4:08 PM, Larry Young <cartravel@pobox.com> wrote:
> If they only wanted it retarded at idle, there would be simpler ways to do
> it. My TR250 had a little valve which activated the vacuum retard with the
> throttle linkage. Why make it vacuum dependent? Are we saying Triumph made
> these cars unnecessarily complicated, i.e. like a German car? - Larry
>
> On 1/12/2014 4:20 PM, Randall wrote:
>
>> This is not a racing question. I'm sure the ignition retard is often
>>> disabled on 6 cylinder Triumphs. Does anyone know why it was used in
>>> the first place? I have always thought it was strictly for
>>> emissions,
>>> which became more restrictive in 1968.
>>>
>> Supposedly it raises cylinder pressure at idle (by allowing the throttle
>> to be open farther at idle), and hence promotes more
>> complete combustion, reducing HC emissions.
>>
>> Perhaps it improves
>>> combustion
>>> at low throttle such as when decelerating or when descending a hill.
>>>
>> That would be the throttle bypass valve, which effectively opens the
>> throttle even further (for the same reason). Other cars used a
>> gulp valve, I'm not sure why the difference.
>>
>> Randall
>>
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