--===============6494880009953496023==
boundary="----=_Part_9919631_1122342066.1475261411453"
------=_Part_9919631_1122342066.1475261411453
Content-Transfer-Encoding: 7bit
Ah ... that would explain the 'loading up.' Essentially, the engine is
flooding. But, I'd expect to see some black smoke out the tailpipe when you
blipped the throttles, and I haven't noticed any (but I'll be watching for it
now).
Bob
----- Original Message -----
Bob's advice includes some excellent tips but one problem that I have
encountered numerous times that causes the idle speed of a car with SU carbs to
decrease until the engine stops is leakage of the float chamber needle valves.
Oddly these valves will frequently only leak when the engine is actually
running as there is no overflow from the float chambers when the ignition is
left on with the engine not running.
I have discovered that if you quickly remove the carb dampers and needles as
soon as the engine stops fuel will be found to be leaking out of the main jet.
I suspect that engine vibration causes the needle valves to leak sometimes.
In the past I used to solve the problem by installing the type of needle valve
with the synthetic rubber tips but those are hard to find these days.
Michael S
BN1 #174
------=_Part_9919631_1122342066.1475261411453
Content-Transfer-Encoding: quoted-printable
<html><body><div style=3D"font-family: Arial; font-size: 12pt; color: #0000=
00"><div aria-label=3D"Compose body">Ah ... that would explain the 'loading=
up.' Essentially, the engine is flooding. But, I'd expect to s=
ee some black smoke out the tailpipe when you blipped the throttles, and I =
haven't noticed any (but I'll be watching for it now).</div><div aria-label=
=3D"Compose body"><br></div><div aria-label=3D"Compose body">Bob</div><div>=
<br></div><hr id=3D"zwchr"><div style=3D"color:#000;font-weight:normal;font=
-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;f=
ont-size:12pt;" data-mce-style=3D"color: #000; font-weight: normal; font-st=
yle: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif=
; font-size: 12pt;"><b></b><br><div><br></div><div dir=3D"ltr"><div class=
=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:=
small" data-mce-style=3D"font-family: comic sans ms,sans-serif; font-size: =
small;">Bob's advice includes some excellent tips but one problem that I ha=
ve encountered numerous times that causes the idle speed of a car with SU c=
arbs to decrease until the engine stops is leakage of the float chamber nee=
dle valves.<br></div><div class=3D"gmail_default" style=3D"font-family:comi=
c sans ms,sans-serif;font-size:small" data-mce-style=3D"font-family: comic =
sans ms,sans-serif; font-size: small;">Oddly these valves will frequently o=
nly leak when the engine is actually running as there is no overflow from t=
he float chambers when the ignition is left on with the engine not running.=
<br></div><div class=3D"gmail_default" style=3D"font-family:comic sans ms,s=
ans-serif;font-size:small" data-mce-style=3D"font-family: comic sans ms,san=
s-serif; font-size: small;">I have discovered that if you quickly remove th=
e carb dampers and needles as soon as the engine stops fuel will be found t=
o be leaking out of the main jet. <br></div><div class=3D"gmail_default" st=
yle=3D"font-family:comic sans ms,sans-serif;font-size:small" data-mce-style=
=3D"font-family: comic sans ms,sans-serif; font-size: small;">I suspect tha=
t engine vibration causes the needle valves to leak sometimes. <br></div><d=
iv class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;fo=
nt-size:small" data-mce-style=3D"font-family: comic sans ms,sans-serif; fon=
t-size: small;">In the past I used to solve the problem by installing the t=
ype of needle valve with the synthetic rubber tips but those are hard to fi=
nd these days.<br><div><br></div></div><div class=3D"gmail_default" style=
=3D"font-family:comic sans ms,sans-serif;font-size:small" data-mce-style=3D=
"font-family: comic sans ms,sans-serif; font-size: small;">Michael S<br></d=
iv><div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-ser=
if;font-size:small" data-mce-style=3D"font-family: comic sans ms,sans-serif=
; font-size: small;">BN1 #174 <br></div></div><div class=3D"gmail_extra"><b=
r></div><div><br></div></div><div><br></div></div></body></html>
------=_Part_9919631_1122342066.1475261411453--
--===============6494880009953496023==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
Archive: http://www.team.net/archive
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
--===============6494880009953496023==--
|