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Hmmm. As ever, thank you, Randall. Yep, forgot about the choke spring. Was
intending to describe the jet housing one. Never knew there was a distinction
that separates vapor lock from percolation (a new term to me). Felt I would be
"cheating" with a fan only because I had a new problem but would be addressing
it but not fixing it directly.
I'll redirect the fuel line. Tell me, how does one add extra insulation to the
heat shield?
With the jet housing springs loose, would I be correct in assuming there would
be some erratic variations in mixture and might these for some reason be more
pronounced at idle?
Thanks again,
Terry
> On July 5, 2019 at 9:59 PM Randall <tr3driver@ca.rr.com> wrote:
>
> Which springs are you talking about? There's a compression spring on the
> jet housing that just keeps the mixture but from moving. And an extension
> spring to the side that returns the jets to the non-choke position after
> using the choke.
>
> People use the term "vapor lock" to cover a lot of different actual
> problems. True vapor lock (IMO) is when the fuel boils before reaching the
> fuel pump (or inside the pump). The pump is not effective at moving vapor
> (hence quits pumping and becomes vapor locked).
> I've never seen that on a TR. And rerouting the line after the pump
> wouldn't help if that was the problem.
>
> Your problem sounds more like percolation, where fuel boils in the jets
> and pushes liquid fuel out into the carb throats. (Like an old fashioned
> coffee percolator.) If so, anything that helps keep the jets cooler will help.
>
> I might try rerouting the fuel line to the stock location, under the
> thermostat housing (where its cooler); and adding more insulation to the heat
> shield.
>
> Not sure why the fan is "cheating"; the problem is caused because we
> can't buy " summer" gas any more. Any method to adapt to available fuel seems
> valid to me. (My intention, if I ever get back to that point, is to make the
> electric fan keep running for 5 or 10 minutes after shutdown.)
>
> A vacuum leak would make it start easier with the choke. Have you tried
> that?
> -- Randall
>
> On 5 July 2019 16:43:31 GMT-05:00, TERRY SMITH <terryrs@comcast.net>
> wrote:
>
> > >
> > Spark issue is solved (bad electronic ignition). Resulting
> > overheating problem is solved (timing/mixture issue). Yet driving an hour
> > in today's heat, the temp needle stayed normal, but the car was a trifle
> > slow to start when I got back to it. Put the pedal all the way down and it
> > fired up, but engine fluttered at low RPM's until I'd reved it for a short
> > time. Sounds like classic vapor lock. Afterwards, the car runs smooth and
> > with great power and acceleration, except idle moves a bit up and down and
> > engine stumbles sometimes at low RPM. When I got home I pulled the plugs
> > and found no black, so apparently I'm not running too rich. Two questions:
> >
> >
> > One: the obvious. Pulling the air cleaners off, I found I'd
> > forgotten to put the springs back on that hold the jet assembly to the
> > carb. Duh. So what are the symptoms of that, other than low scores on IQ
> > tests?
> >
> >
> > Two: the probably obvious. I'd rerouted the fuel lines under the
> > hood. They now go over the thermostat area. I've encased the tubing in
> > slitted fuel line to give them some insulation, but it hasn't solved what
> > seems to be vapor lock. I do have the aftermarket insulative plate under
> > the carbs to bank heat off the manifold. I have a fan I could install that
> > might bring the temp down after engine shutdown but that seems a cheating
> > type fix.
> >
> >
> > Three: the awful. It could be a vacuum leak, I suppose. Please,
> > nobody suggest it is because then it might be true....ugh.
> >
> >
> > Terry Smith, '59 TR3A
> >
> > New Hampshire
> >
> > >
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<!DOCTYPE html>
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<meta charset=3D"UTF-8">
</head><body><p style=3D"font-size: 12pt; font-family: helvetica,arial,sans=
-serif; color: rgb(51, 51, 51);">Hmmm.  As ever, thank you, Randall.&#=
160; Yep, forgot about the choke spring.  Was intending to describe th=
e jet housing one.  Never knew there was a distinction that separates =
vapor lock from percolation (a new term to me).  Felt I would be "=
cheating" with a fan only because I had a new problem but would be addr=
essing it but not fixing it directly.<br></p><p style=3D"font-size: 12pt; f=
ont-family: helvetica,arial,sans-serif; color: rgb(51, 51, 51);"><br></p><p=
style=3D"font-size: 12pt; font-family: helvetica,arial,sans-serif; color: =
rgb(51, 51, 51);">I'll redirect the fuel line.  Tell me, how does =
one add extra insulation to the heat shield?  <br></p><p style=3D"font=
-size: 12pt; font-family: helvetica,arial,sans-serif; color: rgb(51, 51, 51=
);"><br></p><p style=3D"font-size: 12pt; font-family: helvetica,arial,sans-=
serif; color: rgb(51, 51, 51);">With the jet housing springs loose, would I=
be correct in assuming there would be some erratic variations in mixture a=
nd might these for some reason be more pronounced at idle?<br></p><p style=
=3D"font-size: 12pt; font-family: helvetica,arial,sans-serif; color: rgb(51=
, 51, 51);"><br></p><p style=3D"font-size: 12pt; font-family: helvetica,ari=
al,sans-serif; color: rgb(51, 51, 51);">Thanks again,<br></p><p style=3D"fo=
nt-size: 12pt; font-family: helvetica,arial,sans-serif; color: rgb(51, 51, =
51);">Terry<br></p><blockquote type=3D"cite">On July 5, 2019 at 9:59 PM Ran=
dall <tr3driver@ca.rr.com> wrote: <br> <br>Which springs are you ta=
lking about? There's a compression spring on the jet housing that just =
keeps the mixture but from moving. And an extension spring to the side that=
returns the jets to the non-choke position after using the choke. <br> <br=
>People use the term "vapor lock" to cover a lot of different actua=
l problems. True vapor lock (IMO) is when the fuel boils before reaching th=
e fuel pump (or inside the pump). The pump is not effective at moving vapor=
(hence quits pumping and becomes vapor locked). <br>I've never seen th=
at on a TR. And rerouting the line after the pump wouldn't help if that=
was the problem. <br> <br>Your problem sounds more like percolation, where=
fuel boils in the jets and pushes liquid fuel out into the carb throats. (=
Like an old fashioned coffee percolator.) If so, anything that helps keep t=
he jets cooler will help. <br> <br>I might try rerouting the fuel line to t=
he stock location, under the thermostat housing (where its cooler); and add=
ing more insulation to the heat shield. <br> <br>Not sure why the fan is &#=
34;cheating"; the problem is caused because we can't buy " summ=
er" gas any more. Any method to adapt to available fuel seems valid to =
me. (My intention, if I ever get back to that point, is to make the electri=
c fan keep running for 5 or 10 minutes after shutdown.) <br> <br>A vacuum l=
eak would make it start easier with the choke. Have you tried that? <br>-- =
Randall <br> <br><div class=3D"ox-15d3c168ce-gmail_quote">On 5 July 2019 16=
:43:31 GMT-05:00, TERRY SMITH <terryrs@comcast.net> wrote:<blockquo=
te><p style=3D"font-size: 12pt; font-family: helvetica,arial,sans-serif; co=
lor: #333333;">Spark issue is solved (bad electronic ignition).  Resul=
ting overheating problem is solved (timing/mixture issue).  Yet drivin=
g an hour in today's heat, the temp needle stayed normal, but the car w=
as a trifle slow to start when I got back to it.  Put the pedal all th=
e way down and it fired up, but engine fluttered at low RPM's until I&#=
39;d reved it for a short time.  Sounds like classic vapor lock. =
Afterwards, the car runs smooth and with great power and acceleration, exc=
ept idle moves a bit up and down and engine stumbles sometimes at low RPM.&=
#160; When I got home I pulled the plugs and found no black, so apparently =
I'm not running too rich.  Two questions:</p><p style=3D"font-size=
: 12pt; font-family: helvetica,arial,sans-serif; color: #333333;"><br></p><=
p style=3D"font-size: 12pt; font-family: helvetica,arial,sans-serif; color:=
#333333;">One:  the obvious.  Pulling the air cleaners off, I fo=
und I'd forgotten to put the springs back on that hold the jet assembly=
to the carb.  Duh.  So what are the symptoms of that, other than=
low scores on IQ tests?<br></p><p style=3D"font-size: 12pt; font-family: h=
elvetica,arial,sans-serif; color: #333333;"><br></p><p style=3D"font-size: =
12pt; font-family: helvetica,arial,sans-serif; color: #333333;">Two:  =
the probably obvious.  I'd rerouted the fuel lines under the hood.=
  They now go over the thermostat area.  I've encased the tub=
ing in slitted fuel line to give them some insulation, but it hasn't so=
lved what seems to be vapor lock.  I do have the aftermarket insulativ=
e plate under the carbs to bank heat off the manifold.  I have a fan I=
could install that might bring the temp down after engine shutdown but tha=
t seems a cheating type fix.<br></p><p style=3D"font-size: 12pt; font-famil=
y: helvetica,arial,sans-serif; color: #333333;"><br></p><p style=3D"font-si=
ze: 12pt; font-family: helvetica,arial,sans-serif; color: #333333;">Three:&=
#160; the awful.  It could be a vacuum leak, I suppose.  Please, =
nobody suggest it is because then it might be true....ugh.<br></p><p style=
=3D"font-size: 12pt; font-family: helvetica,arial,sans-serif; color: #33333=
3;"><br></p><p style=3D"font-size: 12pt; font-family: helvetica,arial,sans-=
serif; color: #333333;">Terry Smith, '59 TR3A<br></p><p style=3D"font-s=
ize: 12pt; font-family: helvetica,arial,sans-serif; color: #333333;">New Ha=
mpshire<br></p></blockquote></div></blockquote><p style=3D"font-size: 12pt;=
font-family: helvetica,arial,sans-serif; color: #333333;" class=3D"default=
-style"><br> </p></body></html>
=20
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