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Try heavier oil in the dashpot. If it cruises fine then the mixture is
good. Stumbling on acceleration is a sign of not being enriched enough on
acceleration. Thicker oil will enrichen more on acceleration. Try some 30 wt
engine oil and see if it gets better.
In a message dated 5/2/2015 2:46:55 P.M. Pacific Daylight Time,
datsun-roadsters@autox.team.net writes:
Potential worn throttle shafts. Adding choke to enriched mixture makes up
for unmetered air that is coming from someplace.
Check the play in throttle shafts and then look for other areas that might
do same.
Also how's the float bowl fuel level? Adding choke also drops nozzle to
level of lower fuel bowl. But if it runs well otherwise and always idles
decent then neither may apply.
All just wags without being there.
Dave Sommers
Dive Hatteras
703-517-3724
703-818-1850
On May 2, 2015, at 16:55, wattaj via Datsun-roadsters
<_datsun-roadsters@autox.team.net_ (mailto:datsun-roadsters@autox.team.net) >
wrote:
Update: Reassembled and plugged the lifter piston hole, and no
improvement.
Things I have done:
1. Verified the timing and vacuum advance are set and working
correctly.
2. Adjusted the valves to correct clearance.
3. Changed the dashpot oil to ATF.
4. Disassembled the Domes, Pistons, Needles and cleaned.
5. Reset the needles to correct depth according the Z-Therapy video
method.
6. Checked to make sure SU pistons are moving at the same pace within
the domes.
7. Checked for a kinked fuel lines from the float chambers to the
nozzles.
8. Set/Tuned the carbs according the write-up by Keith Williams.
The only thing that seems to get the car running smoothly and able to
accelerate once at speed is to pull the choke out or set the mixture to very
rich.
I would maybe suspect the distributor is worn out, but if that were the
case I wouldn't think pulling the choke out would make any difference.
Thanks,
Alan
____________________________________
From: wattaj via Datsun-roadsters <_datsun-roadsters@autox.team.net_
(mailto:datsun-roadsters@autox.team.net) >
To: "_datsun-roadsters@autox.team.net_
(mailto:datsun-roadsters@autox.team.net) " <_datsun-roadsters@autox.team.net_
(mailto:datsun-roadsters@autox.team.net) >
Sent: Saturday, May 2, 2015 10:49 AM
Subject: [Roadsters] High Speed Hesitation / Potential Fix?
I have been chasing this issue for a while and I am hoping I may have
found something but would like your feedback. (Thanks in advance!)
When cruising around 3000 to 3200 RPM, if I press on the accelerator, the
motor wants to hesitate or cough, it will eventually get beyond this, but
is annoying. I have done my best to tune things and the only thing that
helps is making the front carb run very rich.
Today, when dissembling the carbs, I noticed the front carb was missing
the Lifter Piston (part # 16324-10400) that you can use to test the
lean/rich mixture from the bottom of the carb without having to put your
finger
into the throat of the carb.
Could that be creating a vacuum leak and cause of my issue?
Thanks,
Alan
67-1600 (with a 67.5 engine)
Portland, OR
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<HTML><HEAD>
<META content=3D"text/html; charset=3DUS-ASCII" http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 11.00.9600.17728"></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial; COLOR:=
#000000"=20
bottomMargin=3D7 leftMargin=3D7 rightMargin=3D7 topMargin=3D7><FONT id=3Dr=
ole_document=20
color=3D#000000 size=3D2 face=3DArial>
<DIV>Try heavier oil in the dashpot. If it cruises fine then the mixture=
is=20
good. Stumbling on acceleration is a sign of not being enriched enough on=
=20
acceleration. Thicker oil will enrichen more on acceleration. Try some 30=
wt=20
engine oil and see if it gets better.</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 5/2/2015 2:46:55 P.M. Pacific Daylight Time,=20
datsun-roadsters@autox.team.net writes:</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT=20
style=3D"BACKGROUND-COLOR: transparent" color=3D#000000 size=3D2 face=3D=
Arial>
<DIV>Potential worn throttle shafts. Adding choke to enriched mixt=
ure=20
makes up for unmetered air that is coming from someplace. </DIV>
<DIV><BR></DIV>
<DIV>Check the play in throttle shafts and then look for other areas tha=
t=20
might do same. </DIV>
<DIV><BR></DIV>
<DIV>Also how's the float bowl fuel level? Adding choke also drops=
=20
nozzle to level of lower fuel bowl. But if it runs well otherwise and al=
ways=20
idles decent then neither may apply. </DIV>
<DIV><BR></DIV>
<DIV>All just wags without being there. <BR><BR>Dave Sommers=20
<DIV>Dive Hatteras</DIV>
<DIV>703-517-3724</DIV>
<DIV>703-818-1850</DIV></DIV>
<DIV><BR>On May 2, 2015, at 16:55, wattaj via Datsun-roadsters <<A=20
title=3Dmailto:datsun-roadsters@autox.team.net=20
href=3D"mailto:datsun-roadsters@autox.team.net";>datsun-roadsters@autox.t=
eam.net</A>>=20
wrote:<BR><BR></DIV>
<BLOCKQUOTE type=3D"cite">
<DIV>
<DIV=20
style=3D"FONT-SIZE: 16px; FONT-FAMILY: HelveticaNeue, Helvetica Neue,=
Helvetica, Arial, Lucida Grande, sans-serif; COLOR: #000; BACKGROUND-COLO=
R: #fff">
<DIV id=3Dyui_3_16_0_1_1430599258577_3492>Update: Reassembled an=
d=20
plugged the lifter piston hole, and no improvement.</DIV>
<DIV id=3Dyui_3_16_0_1_1430599258577_3492><BR></DIV>
<DIV id=3Dyui_3_16_0_1_1430599258577_3492>Things I have done:</DIV>
<OL id=3Dyui_3_16_0_1_1430599258577_4440 dir=3Dltr>
<LI id=3Dyui_3_16_0_1_1430599258577_4446>Verified the timing and vac=
uum=20
advance are set and working correctly.<BR>
<LI id=3Dyui_3_16_0_1_1430599258577_4445>Adjusted the valves to corr=
ect=20
clearance.<BR>
<LI id=3Dyui_3_16_0_1_1430599258577_4444>Changed the dashpot oil to=
ATF.<BR>
<LI id=3Dyui_3_16_0_1_1430599258577_4443>Disassembled the Domes, Pis=
tons,=20
Needles and cleaned.<BR>
<LI id=3Dyui_3_16_0_1_1430599258577_4442>Reset the needles to correc=
t depth=20
according the Z-Therapy video method.<BR>
<LI id=3Dyui_3_16_0_1_1430599258577_4441>Checked to make sure SU pis=
tons are=20
moving at the same pace within the domes.<BR>
<LI id=3Dyui_3_16_0_1_1430599258577_4439>Checked for a kinked fuel=
lines=20
from the float chambers to the nozzles.<BR>
<LI id=3Dyui_3_16_0_1_1430599258577_4439>Set/Tuned the carbs accordi=
ng the=20
write-up by Keith Williams.</LI></OL>
<DIV id=3Dyui_3_16_0_1_1430599258577_3492 dir=3Dltr><BR></DIV>
<DIV id=3Dyui_3_16_0_1_1430599258577_3492 dir=3Dltr>The only thing tha=
t seems to=20
get the car running smoothly and able to accelerate once at speed is=
to pull=20
the choke out or set the mixture to very rich.</DIV>
<DIV id=3Dyui_3_16_0_1_1430599258577_3492 dir=3Dltr><BR></DIV>
<DIV id=3Dyui_3_16_0_1_1430599258577_3492 dir=3Dltr>I would maybe susp=
ect the=20
distributor is worn out, but if that were the case I wouldn't think pu=
lling=20
the choke out would make any difference.</DIV>
<DIV id=3Dyui_3_16_0_1_1430599258577_3492 dir=3Dltr><BR></DIV>
<DIV id=3Dyui_3_16_0_1_1430599258577_3492 dir=3Dltr>Thanks,</DIV>
<DIV id=3Dyui_3_16_0_1_1430599258577_3492 dir=3Dltr>Alan</DIV>
<DIV id=3Dyui_3_16_0_1_1430599258577_3492 dir=3Dltr><BR></DIV>
<DIV id=3Dyui_3_16_0_1_1430599258577_3492 dir=3Dltr><BR></DIV>
<DIV id=3Dyui_3_16_0_1_1430599258577_3492><BR></DIV>
<DIV id=3Dyui_3_16_0_1_1430599258577_3821=20
style=3D"FONT-SIZE: 16px; FONT-FAMILY: HelveticaNeue, Helvetica Neue,=
Helvetica, Arial, Lucida Grande, sans-serif">
<DIV id=3Dyui_3_16_0_1_1430599258577_3820=20
style=3D"FONT-SIZE: 16px; FONT-FAMILY: HelveticaNeue, Helvetica Neue,=
Helvetica, Arial, Lucida Grande, sans-serif">
<DIV id=3Dyui_3_16_0_1_1430599258577_3819 dir=3Dltr>
<HR id=3Dyui_3_16_0_1_1430599258577_3867 SIZE=3D1>
<FONT id=3Dyui_3_16_0_1_1430599258577_3866 size=3D2 face=3DArial><B><S=
PAN=20
style=3D"FONT-WEIGHT: bold">From:</SPAN></B> wattaj via Datsun-roadste=
rs=20
<<A title=3Dmailto:datsun-roadsters@autox.team.net=20
href=3D"mailto:datsun-roadsters@autox.team.net";>datsun-roadsters@autox=
.team.net</A>><BR><B><SPAN=20
style=3D"FONT-WEIGHT: bold">To:</SPAN></B> "<A=20
title=3Dmailto:datsun-roadsters@autox.team.net=20
href=3D"mailto:datsun-roadsters@autox.team.net";>datsun-roadsters@autox=
.team.net</A>"=20
<<A title=3Dmailto:datsun-roadsters@autox.team.net=20
href=3D"mailto:datsun-roadsters@autox.team.net";>datsun-roadsters@autox=
.team.net</A>>=20
<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Sent:</SPAN></B> Saturday, Ma=
y 2,=20
2015 10:49 AM<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Subject:</SPAN><=
/B>=20
[Roadsters] High Speed Hesitation / Potential Fix?<BR></FONT></DIV>
<DIV id=3Dyui_3_16_0_1_1430599258577_3824 class=3Dy_msg_container><BR>
<DIV id=3Dyiv2199568988>
<DIV id=3Dyui_3_16_0_1_1430599258577_3828>
<DIV id=3Dyui_3_16_0_1_1430599258577_3827=20
style=3D"FONT-SIZE: 16px; FONT-FAMILY: HelveticaNeue, Helvetica Neue,=
Helvetica, Arial, Lucida Grande, sans-serif; COLOR: #000; BACKGROUND-COLO=
R: #fff">
<DIV id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4465 dir=3Dltr><SPAN=
=20
id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4642>I have been chasing=
this=20
issue for a while and I am hoping I may have found something but would=
like=20
your feedback. (Thanks in advance!)</SPAN></DIV>
<DIV id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4465 dir=3Dltr><SPAN=
><BR=20
clear=3Dnone></SPAN></DIV>
<DIV id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4465 dir=3Dltr><SPAN=
=20
id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4643>When cruising around=
3000 to=20
3200 RPM, if I press on the accelerator, the motor wants to hesitate=
or=20
cough, it will eventually get beyond this, but is annoying. I ha=
ve=20
done my best to tune things and the only thing that helps is making th=
e=20
front carb run very rich.</SPAN></DIV>
<DIV id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4465 dir=3Dltr><SPAN=
><BR=20
clear=3Dnone></SPAN></DIV>
<DIV id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4465 dir=3Dltr><SPAN=
=20
id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4699 class=3Dyiv219956898=
8>Today,=20
when dissembling the carbs, I noticed the front carb was missing the=
Lifter=20
Piston (part #<FONT id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4955=
=20
size=3D3> </FONT></SPAN><FONT=20
id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4954 size=3D3><SPAN=20
id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4857 class=3Dyiv219956898=
8=20
style=3D"FONT-FAMILY: Arial, Helvetica">16324-10400)</SPAN> </FON=
T>that=20
you can use to test the lean/rich mixture from the bottom of the carb=
=20
without having to put your finger into the throat of the carb. <=
/DIV>
<DIV id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4465 dir=3Dltr><SPAN=
><BR=20
clear=3Dnone></SPAN></DIV>
<DIV id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4465 dir=3Dltr><SPAN=
=20
id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4806>Could that be creati=
ng a=20
vacuum leak and cause of my issue?</SPAN></DIV>
<DIV id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4465 dir=3Dltr><SPAN=
><BR=20
clear=3Dnone></SPAN></DIV>
<DIV id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4465 dir=3Dltr><SPAN=
=20
id=3Dyui_3_16_0_1_1430599258577_4359>Thanks,</SPAN></DIV>
<DIV id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4465 dir=3Dltr><SPAN=
=20
id=3Dyiv2199568988yui_3_16_0_1_1430588092886_5026>Alan</SPAN></DIV>
<DIV id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4465 dir=3Dltr><SPAN=
><BR=20
clear=3Dnone></SPAN></DIV>
<DIV id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4465 dir=3Dltr><SPAN=
=20
id=3Dyiv2199568988yui_3_16_0_1_1430588092886_5014>67-1600 (with a 67.5=
=20
engine)</SPAN></DIV>
<DIV id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4465 dir=3Dltr><SPAN=
=20
id=3Dyiv2199568988yui_3_16_0_1_1430588092886_5045>Portland, OR</SPAN><=
/DIV>
<DIV class=3DqtdSeparateBR><BR><BR></DIV>
<DIV id=3Dyiv2199568988yqtfd47683 class=3Dyiv2199568988yqt3367531350>
<DIV id=3Dyiv2199568988yui_3_16_0_1_1430588092886_4568=20
style=3D"FONT-SIZE: 16px; FONT-FAMILY: HelveticaNeue, Helvetica Neue,=
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style=3D"FONT-SIZE: 16px; FONT-FAMILY: HelveticaNeue, Helvetica Neue,=
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class=3Dyiv2199568988y_msg_container><BR=20
clear=3Dnone></DIV></DIV></DIV></DIV></DIV></DIV></DIV><BR>
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