Nope, vacuum advance is only for mileage, think about it when you got
your foot in the gas the throttle plate is open to the the air so there
is no vacuum because air is allowed to flow to the engine, when you are
just cruising the throttle plate is about closed so there is vacuum from
the restriction and safely advances the timing. When you step on the gas
the vacuum goes away and retards the timing to keep the motor safe.
Racers don't use a vacuum advance as they have no use for good mileage
and to much advance kills motors.
On 6/13/2013 11:36 AM, Jim Johnson wrote:
> Michael,
>
> My understanding is that the vacuum advance kicks in at higher RPMs to
> advance the timing of the distributor. I would guess that at higher RPMs
> the engine wouldn't run as well and as efficiently without advanced
> timing. Standard disclaimer - "I could be wrong". ;-)
>
> Cheers!!
> Jim
>
> On Thu, Jun 13, 2013 at 12:28 PM, Michael Rowe <mdrowe@optonline.net> wrote:
>
>> Because of a size mismatch, my vacuum advance is not attached, and the
>> take-off tube is blocked. I just had to redo it yesterday, because the
>> blocking fell off and my idle speed doubled; otherwise, it did not
>> obviously matter.
>>
>> If I do not stomp on the gas all the time, because I am an old fart, and
>> because I currently have very limited use of second gear in this car, does
>> the vacuum advance actually do anything?
>>
>> Michael Rowe
>> 1275 Midget
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