Subject: [6pack] tr6 carb question

From: COLIN THOM via 6pack <[email-masked]>
Date: Mon, 14 Sep 2015 15:21:49 -0600 (MDT)

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Hi Bill,=20

I have more questions than answers, I'm afraid, and after 3 months you've p=
robably asked yourself all of them but here goes:=20

How do you know for certain that 3 cylinders are not firing? This points to=
 a pretty weird scenario of 3 spark plugs, 3 spark plug leads or 3 terminal=
s on the distributor cap all failing at once. Unlikely. Misfiring at temper=
ature means that something is losing continuity when it gets hot. This will=
 not happen due to the temperature compensators. Yes..the car may behave le=
ss then ideally if these things are out of whack, but I believe the cross-o=
ver on the intake manifold would ensure that the problem, if the compensato=
rs were causing one, would be apparent everywhere..not just on 3 cylinders.=
=20

I'm definitely leaning toward an electrical problem. It's not the coil, the=
 condenser or the points because their misbehaviors would not be cylinder-s=
pecific so I think you've got a spark distribution problem.=20

Try swapping some leads between dizzy cap and plugs to see if the misfire m=
igrates when it warms up. If it does=E2=80=A6the lead(s) are the problem. I=
've had lead problems before so I'm leaning in this direction.=20

Ditto with the plugs. Swap them around and see if the problem moves. If it =
does=E2=80=A6plugs are the culprit(s). I'd be less surprised by 3 duds in a=
 batch of 6 leads then I would be by 3 duds in a batch of 6 plugs because l=
eads are more easily damaged.=20

OH=E2=80=A6a longshot: Have you had the air filter box off? If so, and if y=
ou mistakenly covered the hole on the carb throat face that doesn't get a b=
olt going through it, by putting the gasket on backwards, this will be your=
 problem. If those holes are blocked, the car will run OK only up to about =
2500 rpm. If you typically keep the revs at or below this level while you w=
arm the car up, you could think the problem is temperature related. That sa=
id=E2=80=A6.I'm still thinking you've got a sparking problem, not an aspira=
tion problem.=20

Colin=20
'74-1/2=20
----- Original Message -----

From: [email-masked]=20
To: [email-masked]=20
Sent: Monday, September 14, 2015 11:00:01 AM=20
Subject: 6pack Digest, Vol 14, Issue 5=20

Send 6pack mailing list submissions to=20
[email-masked]=20

To subscribe or unsubscribe via the World Wide Web, visit=20
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or, via email, send a message with subject or body 'help' to=20
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You can reach the person managing the list at=20
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When replying, please edit your Subject line so it is more specific=20
than "Re: Contents of 6pack digest..."=20

Today's Topics:=20

1. TR-6 Carb question ([email-masked])=20
2. Re: TR-6 Carb question (Mark J Bradakis)=20

----------------------------------------------------------------------=20

Message: 1=20
Date: Mon, 14 Sep 2015 02:18:22 +0000 (GMT)=20
From: [email-masked]=20
To: [email-masked], [email-masked], Steve Kennedy=20
<[email-masked]>=20
Subject: [6pack] TR-6 Carb question=20

My '75 TR-6 will run well until it warms up and will then drop down to=20
the rear three cylinders with spitting and popping out the exhaust.=20

Following is a list of what I've tried to correct my problem:=20

New:=20
Dizzy cap, rotor, points, ign. wires, coil, capacitor, plugs.=20

Relatively new fuel pump, and a new fuel filter. Plenty of fuel being=20
pumped into both carbs.=20

Carbs: took them apart and cleaned all parts. Replaced the Grose jets=20
and diaphragms. Took the bi-metal thingies apart and cleaned them out=20
and reassembled. Set the float levels. Using 20 weight oil in the=20
dashpots.=20
Used compressed air to flush all fuel lines and can hear gurgling in the=20
gas tank. Float bowels are squeaky clean. Carbs were rebuilt by=20
Roadster Factory several years ago. All this work have resulted in NO=20
correction of the problem.=20

Put new fuel filter on today and it fired right up. Idled smoothly for=20
about 5-8 minutes and dropped down to the rear 3 pots. Still have spark=20
to the front cylinders.=20

Don't have any overheating symptoms and don't smell any anti-freeze or=20
the smell associated with overheating issues. I've been trying to=20
correct the problem for about 3 months now and have run out of ideas on=20
what it could be.=20

Does NOT seem to be electrical in nature but DOES seem to be heat=20
related. As is, runs fine till warm. Another Club mate suggested the=20
bi-metal gizmos may have something to do with my problem. Any ideas?=20

Clue: If I have spark to the three front cylinders and and I have=20
gasoline being pumped into the front carb what would cause the three=20
front cylinders to stop firing when warmed up. Need Help!=20

Bill Wellbaum=20
British Auto Club of Las Vegas=20

------------------------------=20

Message: 2=20
Date: Sun, 13 Sep 2015 22:56:14 -0600=20
From: Mark J Bradakis <[email-masked]>=20
To: [email-masked], [email-masked], [email-masked], Steve=20
Kennedy <[email-masked]>=20
Subject: Re: [6pack] TR-6 Carb question=20

How do you know which cylinders are nit working? What have you done to chec=
k for vacuum leaks?=20

mjb.=20

------------------------------=20

Subject: Digest Footer=20

_______________________________________________=20
6pack mailing list=20
[email-masked]=20
http://autox.team.net/mailman/listinfo/6pack=20

------------------------------=20

End of 6pack Digest, Vol 14, Issue 5=20
************************************=20

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<html><head><style type=3D'text/css'>p { margin: 0; }</style></head><body><=
div style=3D'font-family: arial,helvetica,sans-serif; font-size: 10pt; colo=
r: #000000'><font face=3D"arial, helvetica, sans-serif" size=3D"2">Hi Bill,=
</font><div style=3D"color: rgb(0, 0, 0); font-family: arial, helvetica, sa=
ns-serif; font-size: 10pt;"><span style=3D"font-size: 10pt;"><br></span></d=
iv><div><font face=3D"arial, helvetica, sans-serif" size=3D"2">I have more =
questions than answers, I'm&nbsp;afraid, and after 3 months you've probably=
 asked yourself all of them but here goes:</font></div><div style=3D"color:=
 rgb(0, 0, 0); font-family: arial, helvetica, sans-serif; font-size: 10pt;"=
><br></div><div style=3D"color: rgb(0, 0, 0); font-family: arial, helvetica=
, sans-serif; font-size: 10pt;">How do you know for certain that 3 cylinder=
s are not firing? This points to a pretty weird scenario of 3 spark plugs, =
3 spark plug leads or 3 terminals on the distributor cap all failing at onc=
e. Unlikely. Misfiring at temperature means that something is losing contin=
uity when it gets hot. This will not happen due to the temperature compensa=
tors. Yes..the car may behave less then ideally if these things are out of =
whack, but I believe the cross-over on the intake manifold would ensure tha=
t the problem, if the compensators were causing one, would be apparent ever=
ywhere..not just on 3 cylinders.&nbsp;</div><div style=3D"color: rgb(0, 0, =
0); font-family: arial, helvetica, sans-serif; font-size: 10pt;"><br></div>=
<div style=3D"color: rgb(0, 0, 0); font-family: arial, helvetica, sans-seri=
f; font-size: 10pt;">I'm definitely leaning toward an electrical problem. I=
t's not the coil, the condenser or the points because their misbehaviors wo=
uld not be cylinder-specific so I think you've got a spark distribution pro=
blem.</div><div style=3D"color: rgb(0, 0, 0); font-family: arial, helvetica=
, sans-serif; font-size: 10pt;"><br></div><div style=3D"color: rgb(0, 0, 0)=
; font-family: arial, helvetica, sans-serif; font-size: 10pt;">Try swapping=
 some leads between dizzy cap and plugs to see if the misfire migrates when=
 it warms up. If it does=E2=80=A6the lead(s) are the problem. I've had lead=
 problems before so I'm leaning in this direction.</div><div style=3D"color=
: rgb(0, 0, 0); font-family: arial, helvetica, sans-serif; font-size: 10pt;=
"><br></div><div style=3D"color: rgb(0, 0, 0); font-family: arial, helvetic=
a, sans-serif; font-size: 10pt;">Ditto with the plugs. Swap them around and=
 see if the problem moves. If it does=E2=80=A6plugs are the culprit(s). I'd=
 be less surprised by 3 duds in a batch of 6 leads then I would be by 3 dud=
s in a batch of 6 plugs because leads are more easily damaged.&nbsp;</div><=
div style=3D"color: rgb(0, 0, 0); font-family: arial, helvetica, sans-serif=
; font-size: 10pt;"><br></div><div style=3D"color: rgb(0, 0, 0); font-famil=
y: arial, helvetica, sans-serif; font-size: 10pt;">OH=E2=80=A6a longshot: H=
ave you had the air filter box off? If so, and if you mistakenly covered th=
e hole on the carb throat face that doesn't get a bolt going through it, by=
 putting the gasket on backwards, this will be your problem. If those holes=
 are blocked, the car will run OK only up to about 2500 rpm. If you typical=
ly keep the revs at or below this level while you warm the car up, you coul=
d think the problem is temperature related. That said=E2=80=A6.I'm still th=
inking you've got a sparking problem, not an aspiration problem.</div><div =
style=3D"color: rgb(0, 0, 0); font-family: arial, helvetica, sans-serif; fo=
nt-size: 10pt;"><br></div><div style=3D"color: rgb(0, 0, 0); font-family: a=
rial, helvetica, sans-serif; font-size: 10pt;">Colin&nbsp;</div><div style=
=3D"color: rgb(0, 0, 0); font-family: arial, helvetica, sans-serif; font-si=
ze: 10pt;">'74-1/2</div><br><hr id=3D"zwchr" style=3D"color: rgb(0, 0, 0); =
font-family: arial, helvetica, sans-serif; font-size: 10pt;"><div style=3D"=
color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: =
12pt; font-weight: normal; font-style: normal; text-decoration: none;"><b>F=
rom: </b>[email-masked]<br><b>To: </b>[email-masked]<br=
><b>Sent: </b>Monday, September 14, 2015 11:00:01 AM<br><b>Subject: </b>6pa=
ck Digest, Vol 14, Issue 5<br><br>Send 6pack mailing list submissions to<br=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[email-masked]<br><b=
r>To subscribe or unsubscribe via the World Wide Web, visit<br>&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;http://autox.team.net/mailman/listinfo/=
6pack<br>or, via email, send a message with subject or body 'help' to<br>&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[email-masked]<=
br><br>You can reach the person managing the list at<br>&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[email-masked]<br><br>When replyin=
g, please edit your Subject line so it is more specific<br>than "Re: Conten=
ts of 6pack digest..."<br><br><br>Today's Topics:<br><br>&nbsp;&nbsp; 1. TR=
-6 Carb question ([email-masked])<br>&nbsp;&nbsp; 2. Re: TR-6 Carb ques=
tion (Mark J Bradakis)<br><br><br>-----------------------------------------=
-----------------------------<br><br>Message: 1<br>Date: Mon, 14 Sep 2015 0=
2:18:22 +0000 (GMT)<br>From: [email-masked]<br>To: [email-masked]=
, [email-masked], Steve Kennedy<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&lt;[email-masked]&gt;<br>Subject: [6pack] TR-6 Carb questio=
n<br>Message-ID: &lt;[email-masked]&gt;<br>Conte=
nt-Type: text/plain; charset=3DUTF-8; format=3Dflowed; delsp=3Dno<br><br>My=
 '75 TR-6 will run well until it warms up and will then drop down to <br>th=
e rear three cylinders with spitting and popping out the exhaust.<br><br>Fo=
llowing is a list of what I've tried to correct my problem:<br><br>New:<br>=
Dizzy cap, rotor, points, &nbsp;ign. wires, coil, capacitor, plugs.<br><br>=
Relatively new fuel pump, and a new fuel filter. Plenty of fuel being <br>p=
umped into both carbs.<br><br>Carbs: &nbsp;took them apart and cleaned all =
parts. &nbsp;Replaced the Grose jets <br>and diaphragms. &nbsp;Took the bi-=
metal thingies apart and cleaned them out <br>and reassembled. &nbsp; Set t=
he float levels. &nbsp;Using 20 weight oil in the <br>dashpots.<br>Used com=
pressed air to flush all fuel lines and can hear gurgling in the <br>gas ta=
nk. &nbsp;Float bowels are squeaky clean. &nbsp;Carbs were rebuilt by <br>R=
oadster Factory several years ago. &nbsp;All this work have resulted in NO =
<br>correction of the problem.<br><br>Put new fuel filter on today and it f=
ired right up. &nbsp;Idled smoothly for <br>about 5-8 minutes and dropped d=
own to the rear 3 pots. &nbsp;Still have spark <br>to the front cylinders.<=
br><br>Don't have any overheating symptoms and don't smell any anti-freeze =
or <br>the smell associated with overheating issues. &nbsp;I've been trying=
 to <br>correct the problem for about 3 months now and have run out of idea=
s on <br>what it could be.<br><br>Does NOT seem to be electrical in nature =
but DOES seem to be heat <br>related. &nbsp;As is, runs fine till warm. &nb=
sp;Another Club mate suggested the <br>bi-metal gizmos may have something t=
o do with my problem. &nbsp;Any ideas?<br><br>Clue: &nbsp;If I have spark t=
o the three front cylinders and and I have <br>gasoline being pumped into t=
he front carb what would cause the three <br>front cylinders to stop firing=
 when warmed up. &nbsp;Need Help!<br><br>Bill Wellbaum<br>British Auto Club=
 of Las Vegas<br><br><br>------------------------------<br><br>Message: 2<b=
r>Date: Sun, 13 Sep 2015 22:56:14 -0600<br>From: Mark J Bradakis &lt;mark@b=
radakis.com&gt;<br>To: [email-masked], [email-masked], jpaynepbr@=
cox.net, Steve<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Kennedy &=
lt;[email-masked]&gt;<br>Subject: Re: [6pack] TR-6 Carb question<br>Mes=
sage-ID: &lt;[email-masked]&gt;<br>Content-Type: text/plain;=
 charset=3DUTF-8; format=3Dflowed<br><br>How do you know which cylinders ar=
e nit working? What have you done to check for vacuum leaks?<br><br>mjb.<br=
><br><br><br><br>------------------------------<br><br>Subject: Digest Foot=
er<br><br>_______________________________________________<br>6pack mailing =
list<br>[email-masked]<br>http://autox.team.net/mailman/listinfo/6pac=
k<br><br><br>------------------------------<br><br>End of 6pack Digest, Vol=
 14, Issue 5<br>************************************<br></div><br></div></b=
ody></html>
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