George, I'm the original owner of my '67 BJ8 and back when my Healey was new,
just for curiosity while sitting at a red light I would pump the brake peddle
and watch the RPM rise and settle back down after stopping the peddle pumping.
When the brake peddle is pressed and released, atmospheric pressure is
introduced to the vacuum side of the booster diaphragm and thus fresh air is
introduced to the intake manifold when the vacuum is restored leaning out the
the slightly rich mixture that is present at idle momentarily causing the RPM
to increase. It is a normal phenomena. I hope this makes sense.
Larry
'67 BJ8
-----Original Message-----
From: George Vernau Sr <gvernau@gmail.com>
To: Healey list <healeys@autox.team.net>
Sent: Wed, Jun 3, 2015 4:56 pm
Subject: [Healeys] rebuilt HD8s
I recently rebuilt the HD8 carbs on my 1967 BJ8 and the car runs great again
(although the price of carb kits is just crazy these days). However, I notice a
slight increase in idle speed whenever I put my foot on the brake, like when
sitting at a light. I can't ever remember noticing this before, is there a
vacuum leak or is the booster not working properly? Any ideas?
Thanks for any input,
George Vernau
Houston TX
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