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Did you replace the teflon bushes around the throttle shafts on your HD8s?
If these are old or worn, air will start leaking into the carbs when they
get hot and you idle will become erratic, it can seem like vapor lock but
it might be simply a matter of fuel mixture getting too much air when the
car is hot.
On Thu, May 6, 2021 at 11:13 PM <fsufan1952@yahoo.com> wrote:
> Hi All ,
> I have a 67 BJ-8 . And when I did a frame off restoration I lived in
> Mass. Well me and my Healey are now living in central Florida. And my mo=
ds
> are a set of headers from Dennis Welch along with his matching 2 inch
> exhaust system. I had the headers ceramic coated and I wrapped them with
> header insulation tape . I completely used fuel line insulation wrap from
> mid way on the car all the way up to the carbs . I installed a neat set o=
f
> fuel bowl insulated coozies from Joe Coutu. Along with a new radiator fro=
m
> AH Spares and a electronic fan mounted to it . My next mod was a new inta=
ke
> manifold , also from AH Spares , there newly designed system with round 2
> inch ports . I also had this ceramic coated . I still install the origina=
l
> Healey heat shield . I installed an electronic ignition system and a new =
SU
> electronic fuel pump .
> Well running around Florida it runs strong . But every time I come t=
o
> a stop light , then pull away I always have vapor lock problems. Stopping
> at a stop light I get no air flow around the carbs . Looking back
> installing those fender rally vents I=E2=80=99m sure would help getting r=
id of some
> of the engine heat . None of these mods have stopped my vapor lock
> problems. My next attempt at solving the fuel vapor problem is I just
> insalled a cooling fan from Chill Out , a company that specializes in rac=
e
> car cooling systems. It=E2=80=99s a 3 inch fan about the size of a beer c=
an . I
> mounted it next to my brake reservoir with ducting on the intake side
> pulling in air from in front of the radiator, then duct work on the outpu=
t
> side blowing onto the carbs . Unfortunately I ran out of time to test it
> as I=E2=80=99m now back in Mass for 3 weeks. When I get back to Florida =
I=E2=80=99m
> looking forward to =F0=9F=A4=9E seeing if this helps . I can supply pictu=
res of all
> the above mods if anyone is interested.
> Wish me Luck =F0=9F=91=8D=F0=9F=8F=BB Don
>
> Sent from my iPhone
>
> On May 6, 2021, at 10:03 AM, Alan Seigrist <healey.nut@gmail.com> wrote:
>
> =EF=BB=BF
> I have found that having the header and miniature heat shield to be
> ceramic coated makes a huge difference in the engine bay but then transfe=
rs
> heat to the exhaust, so it=E2=80=99s only good if you have an SS exhaust =
system and
> then you need to insulate around the pump as Michael has said. i just wr=
ap
> header tape around the exhaust pipe in that area and that is also effecti=
ve,
>
> On Thu, 6 May 2021 at 9:52 PM, Michael Salter <michaelsalter@gmail.com>
> wrote:
>
>> Hi Ken, yes I think everyone with a 100 has encountered fuel delivery
>> issues with modern fuels. Methanol lowers the boiling point of petrol to=
a
>> point where it becomes a problem.
>> With the 100 there are 2 distinct issues.
>>
>> Firstly, because the fuel pump and its associated lines are directly
>> above the exhaust pipe, hot air heats them. The fuel in the suction side=
of
>> the pump has, effectively, a lower boiling point than it would at
>> atmospheric pressure. This fuel tends to boil if there isn't sufficient =
air
>> circulation to keep the pump and lines cooled, as occurs while stopped i=
n
>> traffic on a hot day. True vapor lock occurs because the pump will not
>> pump sufficient volume of vapour to exceed the rate of its production b=
y
>> the boiling process.
>>
>> Secondly the carburetor float chambers and the small fuel passage to the
>> jet are very close to the exhaust manifold.
>> The manifold radiates lots of heat which heats them. Again when the car
>> is moving at a reasonable pace the incoming air through the grille and
>> around the radiator is sufficient to maintain the carburetor at a low
>> enough temperature to prohibit boiling but, again when stopped in traffi=
c
>> this doesn't happen.
>>
>> I have managed to eliminate the first problem by installing a insulating
>> sleeve from a modern car's AC hose over the fuel line from the tank to t=
he
>> pump.
>>
>> For the second I have made small heatshields from 24 gauge galvanized
>> steel to shield as much as possible of the carburetors from the radiated
>> heat. This has helped considerably but not completely eliminated the
>> problem.
>>
>> For the most part neither of these modifications are visible and I have
>> found that fuel delivery issues, although not completely eliminated, are
>> manageable.
>> I am considering installing a small blower and duct sourcing air from
>> behind the grille to see how much difference that makes but if course th=
at
>> will be visible.
>> Hope that helps, others may have found better solutions.
>>
>> M
>>
>>
>> On Mon., May 3, 2021, 2:58 p.m. Ken Fleming, <ahmg@aol.com> wrote:
>>
>>> Michael , I thought you maybe have experience this ans have a solution =
.
>>> On my Bn1 which is M spec with carbs, advance distributed, LeMans Cam a=
nd
>>> Pistons has always suffered from what I call vapor lock of gas. Especia=
lly
>>> in hot weather .
>>> I am assuming the heat is from
>>> Manifold and it placement near carbs or fuel pump/ battery near exhaust
>>> play a role but I could be wrong . I have asked other owners and they s=
eem
>>> most of them not to have same problem. I do have a heat sheild added wi=
th
>>> little result.
>>> I am at a loss as to
>>> What to do
>>> Next , but have you experienced this and have any suggestions. Are my
>>> assumptions
>>> Correct on heat causing the issue. Could today=E2=80=99s quality if ga=
s be a
>>> issue?
>>> I recall reading this was a common issue for 100=E2=80=99s to have vapo=
r issues.
>>> Ken
>>>
>>> Sent from my iPhone
>>>
>> _______________________________________________
>> Support Team.Net http://www.team.net/donate.html
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>>
>> Archive: http://www.team.net/pipermail/healeys
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>>
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>>
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>>
>> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
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>
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>
--00000000000092785705c1b67e9d
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">Did you replace the teflon bushes around the throttle shaf=
ts on your HD8s?=C2=A0 If these are old or worn, air will start leaking int=
o the carbs when they get hot and you idle will become erratic, it can seem=
like vapor lock but it might be simply a matter of fuel mixture getting to=
o much air when the car is hot.</div><br><div class=3D"gmail_quote"><div di=
r=3D"ltr" class=3D"gmail_attr">On Thu, May 6, 2021 at 11:13 PM <<a href=
=3D"mailto:fsufan1952@yahoo.com";>fsufan1952@yahoo.com</a>> wrote:<br></d=
iv><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bord=
er-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"auto">Hi A=
ll ,=C2=A0<div>=C2=A0 =C2=A0 I have a 67 BJ-8 . And =C2=A0when I did a fram=
e off restoration I lived in Mass.=C2=A0 Well me and my Healey are now livi=
ng in central Florida. And my mods are a set of headers from Dennis Welch a=
long with his matching 2 inch exhaust system. I had the headers ceramic coa=
ted and I wrapped them with header insulation tape . I completely used fuel=
line insulation wrap from mid way on the car all the way up to the carbs .=
I installed a neat set of fuel bowl insulated coozies from Joe Coutu. Alon=
g with a new radiator from AH Spares and a electronic fan mounted to it . M=
y next mod was a new intake manifold , also from AH Spares , there newly de=
signed system with round 2 inch ports . I also had this ceramic coated . I =
still install the original Healey heat shield . I installed an electronic i=
gnition system and a new SU electronic fuel pump .=C2=A0</div><div>=C2=A0 =
=C2=A0 =C2=A0Well running around Florida it runs strong . But every time I =
come to a stop light , then pull away I always have vapor lock problems. St=
opping at a stop light I get no air flow around the carbs . Looking back in=
stalling those fender rally vents I=E2=80=99m sure would help getting rid o=
f some of the engine heat . None of these mods have stopped my vapor lock p=
roblems.=C2=A0 My next attempt at solving the fuel vapor problem is I just =
insalled a cooling fan from Chill Out , a company that specializes in race =
car cooling systems. It=E2=80=99s a 3 inch fan about the size of a beer can=
. I mounted it next to my brake reservoir with ducting on the intake side =
pulling in air from in front of the radiator, then duct work on the output =
side blowing onto the carbs .=C2=A0 Unfortunately I ran out of time to test=
it as I=E2=80=99m now back in Mass for 3 weeks.=C2=A0 When I get back to F=
lorida I=E2=80=99m looking forward to =F0=9F=A4=9E seeing if this helps . I=
can supply pictures of all the above mods if anyone is interested.=C2=A0</=
div><div>=C2=A0 =C2=A0 Wish me Luck =F0=9F=91=8D=F0=9F=8F=BB =C2=A0 Don</di=
v><div><br><div dir=3D"ltr">Sent from my iPhone</div><div dir=3D"ltr"><br><=
blockquote type=3D"cite">On May 6, 2021, at 10:03 AM, Alan Seigrist <<a =
href=3D"mailto:healey.nut@gmail.com"; target=3D"_blank">healey.nut@gmail.com=
</a>> wrote:<br><br></blockquote></div><blockquote type=3D"cite"><div di=
r=3D"ltr">=EF=BB=BF<div dir=3D"auto">I have found that having the header an=
d miniature heat shield to be ceramic coated makes a huge difference in the=
engine bay but then transfers heat to the exhaust, so it=E2=80=99s only go=
od if you have an SS exhaust system and then you need to insulate around th=
e pump as Michael has said. =C2=A0i just wrap header tape around the exhaus=
t pipe in that area and that is also effective,</div><div><br><div class=3D=
"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, 6 May 2021 at 9=
:52 PM, Michael Salter <<a href=3D"mailto:michaelsalter@gmail.com"; targe=
t=3D"_blank">michaelsalter@gmail.com</a>> wrote:<br></div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid=
rgb(204,204,204);padding-left:1ex"><div dir=3D"auto">Hi Ken, yes I think e=
veryone with a 100 has encountered fuel delivery issues with modern fuels. =
Methanol lowers the boiling point of petrol to a point where it becomes a p=
roblem.=C2=A0<div dir=3D"auto">With the 100 there are 2 distinct issues.=C2=
=A0</div><div dir=3D"auto"><br></div><div dir=3D"auto">Firstly, because the=
fuel pump and its associated lines are directly above the exhaust pipe, ho=
t air heats them. The fuel in the suction side of the pump has, effectively=
, a lower boiling point than it would at atmospheric pressure. This fuel te=
nds to boil if there isn't sufficient air circulation to keep the pump =
and lines cooled, as occurs while stopped in traffic on a hot day. True vap=
or lock occurs because the pump will not pump=C2=A0 sufficient volume of va=
pour to exceed the rate of its production by the boiling process.</div><div=
dir=3D"auto"><br></div><div dir=3D"auto">Secondly the carburetor float cha=
mbers and the small fuel passage to the jet are very close to the exhaust m=
anifold.=C2=A0</div><div dir=3D"auto">The manifold radiates lots of heat wh=
ich heats them. Again when the car is moving at a reasonable pace the incom=
ing air through the grille and around the radiator is sufficient to maintai=
n the carburetor at a low enough temperature to prohibit boiling but, again=
when stopped in traffic this doesn't happen.</div><div dir=3D"auto"><b=
r></div><div dir=3D"auto">I have managed to eliminate the first problem by =
installing a insulating sleeve from a modern car's AC hose over the fue=
l line from the tank to the pump.</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">For the second I have made small heatshields from 24 gauge galvan=
ized steel to shield as much as possible of the carburetors from the radiat=
ed heat. This has helped considerably but not completely eliminated the pro=
blem.=C2=A0</div><div dir=3D"auto"><br></div><div dir=3D"auto">For the most=
part neither of these modifications are visible and I have found that fuel=
delivery issues, although not completely eliminated, are manageable.=C2=A0=
</div><div dir=3D"auto">I am considering installing a small blower and duct=
sourcing air from behind the grille to see how much difference that makes =
but if course that will be visible.</div><div dir=3D"auto">Hope that helps,=
others may have found better solutions.=C2=A0</div><div dir=3D"auto"><br><=
/div><div dir=3D"auto">M</div><div dir=3D"auto"><br></div></div><br><div cl=
ass=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon., May 3, 2=
021, 2:58 p.m. Ken Fleming, <<a href=3D"mailto:ahmg@aol.com"; target=3D"_=
blank">ahmg@aol.com</a>> wrote:<br></div><blockquote class=3D"gmail_quot=
e" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204)=
;padding-left:1ex">Michael , I thought you maybe have experience this ans h=
ave a solution . On my Bn1 which is M spec with carbs, advance distributed,=
LeMans Cam and Pistons has always suffered from what I call vapor lock of =
gas. Especially in hot weather . <br>
I am assuming the heat is from<br>
Manifold and it placement near carbs or fuel pump/ battery near exhaust pla=
y a role but I could be wrong . I have asked other owners and they seem mos=
t of them not to have same problem. I do have a heat sheild added with litt=
le result.<br>
I am at a loss as to<br>
What to do<br>
Next , but have you experienced this and have any suggestions. Are my assum=
ptions<br>
Correct on heat causing the issue.=C2=A0 Could today=E2=80=99s quality if g=
as be a issue?<br>
I recall reading this was a common issue for 100=E2=80=99s to have vapor is=
sues. <br>
Ken<br>
<br>
Sent from my iPhone<br>
</blockquote></div>
_______________________________________________<br>
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