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Bob-
That's sort of what I expected to hear- thanks for the excellent and
succinct explanation.
George Vernau
Houston TX
On Wed, Jun 3, 2015 at 6:36 PM, Bob Spidell <bspidell@comcast.net> wrote:
> Almost certainly a leak at the servo. When you apply brakes, a small
> slave cylinder in the servo moves a valve which gates atmospheric pressure
> into the outer part of the large air/vacuum piston (vacuum is held on both
> sides when brakes are not being applied). If this valve is not sealing
> completely it could allow atmospheric pressure air into the manifold (there
> is a check valve on the servo to prevent this and hold some vacuum in the
> event of engine failure at speed, but it could leak, too).
>
> Now that you've done the carbs, it's on to the servo! ;)
>
> Bob
>
> ------------------------------
> *From: *"George Vernau Sr" <gvernau@gmail.com>
> *To: *"Healey list" <healeys@autox.team.net>
> *Sent: *Wednesday, June 3, 2015 1:56:17 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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<div dir=3D"ltr">Bob-<div>That's sort of what I expected to hear- thank=
s for the excellent and succinct explanation.</div><div>George Vernau</div>=
<div><span style=3D"color:rgb(0,0,0)"><font face=3D"arial, helvetica, sans-=
serif">Houston TX</font></span><br></div><div><br></div></div><div class=3D=
"gmail_extra"><br><div class=3D"gmail_quote">On Wed, Jun 3, 2015 at 6:36 PM=
, Bob Spidell <span dir=3D"ltr"><<a href=3D"mailto:bspidell@comcast.net"=
target=3D"_blank">bspidell@comcast.net</a>></span> wrote:<br><blockquot=
e class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc sol=
id;padding-left:1ex"><div><div style=3D"font-family:Arial;font-size:12pt;co=
lor:#000000"><div>Almost certainly a leak at the servo.=C2=A0 When you appl=
y brakes, a small slave cylinder in the servo moves a valve which gates atm=
ospheric pressure into the outer part of the large air/vacuum piston (vacuu=
m is held on both sides when brakes are not being applied).=C2=A0 If this v=
alve is not sealing completely it could allow atmospheric pressure air into=
the manifold (there is a check valve on the servo to prevent this and hold=
some vacuum in the event of engine failure at speed, but it could leak, to=
o).<br></div><div><br></div><div>Now that you've done the carbs, it'=
;s on to the servo!=C2=A0=C2=A0 ;)<br></div><div><br></div><div>Bob<br></di=
v><div><br></div><hr><div style=3D"color:#000;font-weight:normal;font-style=
:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-si=
ze:12pt"><b>From: </b>"George Vernau Sr" <<a href=3D"mailto:gv=
ernau@gmail.com" target=3D"_blank">gvernau@gmail.com</a>><br><b>To: </b>=
"Healey list" <<a href=3D"mailto:healeys@autox.team.net"; targe=
t=3D"_blank">healeys@autox.team.net</a>><br><b>Sent: </b>Wednesday, June=
3, 2015 1:56:17 PM<br><b>Subject: </b>[Healeys] rebuilt HD8s<br><div><br><=
/div><div dir=3D"ltr">I recently rebuilt the HD8 carbs on my 1967 BJ8 and t=
he car runs great again (although the price of carb kits is just crazy thes=
e days). However, I notice a slight increase in idle speed whenever I put m=
y foot on the brake, like when sitting at a light.=C2=A0 I can't ever r=
emember noticing this before, is there a vacuum leak or is the booster not =
working properly?=C2=A0 Any ideas?<div>Thanks for any input,</div><div>Geor=
ge Vernau</div><div>Houston TX</div></div><br>_____________________________=
__________________<br><br><div><br></div></div><div><br></div></div></div><=
/blockquote></div><br></div>
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