The other reason that many volks use the 010, 019 and 009 is due to
running aftermarket dual carb setups. These setups have no central
vacuum source for both carbs. The 009 works better on this setup than
most any vacuum advance unit would.
The factory dual carb setups like late bus and earlier type 3 and 4
had a large diameter balance tube that ran between the intake manifolds
to even out the gas pulsation due to the boxer design. But the vacuum
signal needs to come from the carb vacuum port that's tapped off near
the throttle plate level for the advance diaphragm. If you just tap
vacuum from one carb, the strength of the vacuum signal isn't as strong
as the centrally-mounted single carb setup. Some people recommend
running a small diameter vacuum line between both car ports and teeing
off to the distributor advance. The retard port on a DVDA would be even
harder to correctly hook-up as most aftermarket dual carbs have no port
for this specifically-timed vacuum signal. Hooking up the retard port on
the dizzy is only necessary for reduced emissions on deceleration, so
most people don't use this anyway.
Mike B.
On 12/25/2012 9:28 AM, No Quarter wrote:
The use of the 009 was originally born out of frustration when
replacement factory distributors couldn't be found or were too
expensive to buy. They worked better than a non-functional
distributor, but were a compromise at best.
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