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Listers
OK. Since Gary wrote to the list several days ago and twenty plus emails si=
nce, we have concluded that clothes pins should only be used for the origin=
ally intended use, pinning clothes and that the possibilities of vapor lock=
was not taken into the design of SU fuel pumps used on a Austin Healey. Th=
e designers did use a heat shield between the carbs and exhaust manifold pe=
rhaps with the intent to protect the fuel bowls for excess heat but as the =
100 owners know the heat shield was only adjacent to the rear carb float bo=
wl since there is no shield on the front carb. By the way the front float =
bowl and the exhaust manifold are only 1 inch apart. Suspect that the prox=
imity of the 100=E2=80=99s four blade fan (read hurricane force fan-=F0=9F=
=98=8A) was enough to quench any heat problems on the front carb.
For the later cars the heat shield covered it all and supposedly prevented =
any expected problems in the fuel delivery department.=20
So where does all this rambling bring us to?=20
For me it still begs the question, Where does the vapor lock begin?=20
Temps at the exhaust manifold can be in the 300+ degree range (unless you a=
re screaming around a race track) but the tail pipe will probably be about =
a third of that when the car is in motion. So the proximity of the fuel lin=
e to the heat source varies front to rear. I mentioned the factory moving t=
he fuel pump to the right side of the later cars. I suspect that there was=
a reason for that change. I=E2=80=99m not sure if Gary=E2=80=99s car has t=
he pump on the left or right side.=20
Any one want to write email 24+ on this subject?
This is what happens when you wear a mask and rebreathe your own exhaust al=
l day=E2=80=A6I anxiously await your feedback. And perhaps a tank of oxygen=
!
Perry
Sent from Mail for Windows 10
On Mon, Jun 22, 2020 at 9:12 AM editorgary--- via Healeys <healeys@autox.te=
am.net> wrote:
Yesterday I took my Healey BN& out for its first good run of the season -- =
75 miles of southern Oregon backroads -- with our local Rogue Euro Car Grou=
p. Everything was terrific from start to finish. Car started on the first p=
ush of the button after sitting for six weeks, ran smoothly from start to f=
inish, never faltered in restarts, everything nominal.
Except that, towards the end of the run on a pretty hot day (in mid 90s tho=
ugh the car never ran warm all day) as I was cruising along about 40 mph, t=
he fuel pump started tapping at a high rate of speed and pretty continuousl=
y -- certain enough so I could hear it behind me. I have a standard origina=
l-spec points-style fuel pump, purchased new from Moss about 10 years ago a=
nd running without any issues every since.=20
Any thoughts from anyone -- could it just have been the heat? As noted, the=
car never missed a beat, so fuel was getting through the carbs smoothly at=
all times.=20
Anyone?
Gary Anderson
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--></style></head><body lang=3DEN-US link=3Dblue vlink=3D"#954F72"><div cla=
ss=3DWordSection1><p class=3DMsoNormal>Listers</p><p class=3DMsoNormal>OK. =
Since Gary wrote to the list several days ago and twenty plus emails since,=
we have concluded that clothes pins should only be used for the originally=
intended use, pinning clothes and that the possibilities of vapor lock was=
not taken into the design of SU fuel pumps used on a Austin Healey. The de=
signers did use a heat shield between the carbs and exhaust manifold perhap=
s with the intent to protect the fuel bowls for excess heat but as the 100 =
owners know the heat shield was only adjacent to the rear carb float bowl s=
ince there is no shield on the front carb.=C2=A0 By the way the front float=
bowl and the exhaust manifold are only 1 inch apart. =C2=A0Suspect that th=
e proximity of the 100=E2=80=99s four blade fan (read hurricane force fan-<=
span style=3D'font-family:"Segoe UI Emoji",sans-serif'>😊</span>) wa=
s enough to quench any heat problems on the front carb.</p><p class=3DMsoNo=
rmal><o:p> </o:p></p><p class=3DMsoNormal>For the later cars the heat =
shield covered it all and supposedly prevented any expected problems in the=
fuel delivery department. </p><p class=3DMsoNormal><o:p> </o:p></p><p=
class=3DMsoNormal>So where does all this rambling bring us to? </p><p clas=
s=3DMsoNormal>For me it still begs the question, Where does the vapor lock =
begin? </p><p class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>T=
emps at the exhaust manifold can be in the 300+ degree range (unless you ar=
e screaming around a race track) but the tail pipe will probably be about a=
third of that when the car is in motion. So the proximity of the fuel line=
to the heat source varies front to rear. I mentioned the factory moving th=
e fuel pump to the right side of the later cars.=C2=A0 I suspect that there=
was a reason for that change. I=E2=80=99m not sure if Gary=E2=80=99s car h=
as the pump on the left or right side. </p><p class=3DMsoNormal><o:p> =
</o:p></p><p class=3DMsoNormal>Any one want to write email 24+ on this subj=
ect?</p><p class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>This=
is what happens when you wear a mask and rebreathe your own exhaust all da=
y=E2=80=A6I anxiously await your feedback. And perhaps a tank of oxygen!</p=
><p class=3DMsoNormal>Perry</p><p class=3DMsoNormal><o:p> </o:p></p><p=
class=3DMsoNormal>Sent from <a href=3D"https://go.microsoft.com/fwlink/?Li=
nkId=3D550986">Mail</a> for Windows 10</p><p class=3DMsoNormal><o:p> <=
/o:p></p><div style=3D'mso-element:para-border-div;border:none;border-top:s=
olid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal style=3D=
'border:none;padding:0in'><br><br></p></div><p class=3DMsoNormal><o:p> =
;</o:p></p><p class=3DMsoNormal><o:p> </o:p></p><div><div><div><div id=
=3Dyiv5807702342><div><div><blockquote style=3D'border:none;border-left:sol=
id #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0=
pt;margin-right:0in;margin-bottom:5.0pt'><div id=3Dyiv5807702342yqtfd81016>=
<p class=3DMsoNormal style=3D'margin-left:4.8pt'><span style=3D'font-size:1=
0.0pt;font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span><=
/p><div><div><p class=3DMsoNormal style=3D'margin-left:4.8pt'><span style=
=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>On Mon, Ju=
n 22, 2020 at 9:12 AM editorgary--- via Healeys <<a href=3D"mailto:heale=
ys@autox.team.net" target=3D"_blank">healeys@autox.team.net</a>> wrote:<=
o:p></o:p></span></p></div><blockquote style=3D'border:none;border-left:sol=
id #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0=
pt;margin-right:0in;margin-bottom:5.0pt'><div><div><p class=3DMsoNormal sty=
le=3D'margin-left:9.6pt'><span style=3D'font-size:10.0pt;font-family:"Arial=
",sans-serif;color:black'>Yesterday I took my Healey BN& out for its fi=
rst good run of the season -- 75 miles of southern Oregon backroads -- with=
our local Rogue Euro Car Group. Everything was terrific from start to fini=
sh. Car started on the first push of the button after sitting for six weeks=
, ran smoothly from start to finish, never faltered in restarts, everything=
nominal.<o:p></o:p></span></p></div><div><p class=3DMsoNormal style=3D'mar=
gin-left:9.6pt'><span style=3D'font-size:10.0pt;font-family:"Arial",sans-se=
rif;color:black'><br>Except that, towards the end of the run on a pretty ho=
t day (in mid 90s though the car never ran warm all day) as I was cruising =
along about 40 mph, the fuel pump started tapping at a high rate of speed a=
nd pretty continuously -- certain enough so I could hear it behind me. I ha=
ve a standard original-spec points-style fuel pump, purchased new from Moss=
about 10 years ago and running without any issues every since. <o:p></o:p>=
</span></p></div><div><p class=3DMsoNormal style=3D'margin-left:9.6pt'><spa=
n style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'><o:=
p> </o:p></span></p></div><div><p class=3DMsoNormal style=3D'margin-le=
ft:9.6pt'><span style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;co=
lor:black'>Any thoughts from anyone -- could it just have been the heat? As=
noted, the car never missed a beat, so fuel was getting through the carbs =
smoothly at all times. <o:p></o:p></span></p></div><div><p class=3DMsoNorma=
l style=3D'margin-left:9.6pt'><span style=3D'font-size:10.0pt;font-family:"=
Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p cl=
ass=3DMsoNormal style=3D'margin-left:9.6pt'><span style=3D'font-size:10.0pt=
;font-family:"Arial",sans-serif;color:black'>Anyone?<o:p></o:p></span></p><=
/div><div><p class=3DMsoNormal style=3D'margin-left:9.6pt'><span style=3D'f=
ont-size:10.0pt;font-family:"Arial",sans-serif;color:black'><o:p> </o:=
p></span></p></div><div><p class=3DMsoNormal style=3D'margin-left:9.6pt'><s=
pan style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>G=
ary Anderson<o:p></o:p></span></p></div><div><p class=3DMsoNormal style=3D'=
margin-left:9.6pt'><span style=3D'font-size:10.0pt;font-family:"Arial",sans=
-serif;color:black'><o:p> </o:p></span></p></div></div></blockquote></=
div></div></blockquote></div></div></div></div></div></div><p class=3DMsoNo=
rmal><o:p> </o:p></p><p class=3DMsoNormal><o:p> </o:p></p></div><=
/body></html>=
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