Subject: [Fot] GT6 Burnt plugs

From: [email-masked]
Date: Thu, 15 Oct 2015 07:42:09 -0600

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=0A=0A=09Finally got the GT6 back together and had it at Brainerd for tw=
o=0Atrack days. First day still had overheating issues even with the oil=
=0Acooler, external octopus oiling and scirocco rad. Also had a vibratio=
n=0Ain the rear. =0A=0A=09Then we fabricated a full rad shroud and re-di=
d one of the 240Z rear=0Aaxles. Lost all but a very minor vibration that=
 show up at around 100=0AMPH which might just be from driving an 1800 lb=
 car that fast. =0A=0A=09Cured the overheating and actually had to tape=
 the rad and oil=0Acooler. After many laps the water was at 200 and the=
 oil at 220.=0AOutside temp 65-70 degrees.=0A=0A=09Our new problem is we=
 burned the electrodes off of number 1 and 4=0Aplugs. The other four loo=
ked a little lean, but not bad. We are=0Arunning 1.50 Strombergs.=0A=0A=
=09It seems to me that the stock intake is starving 1 and 4. =0A=0A=09I'=
ve read that Kas drilled the float jets to cure starvation at high=0ARPM=
's, but what about the main jets. Will this cause serious bog at=0Amid-R=
PM's. Also would reworking the number 1 and 4 intake runners help=0Athe=
 problem. We are maxing out at 6000 RPM's.=0A=0A=09As for the minor vibr=
ation, we have a rebuilt, fully welded 3:89. =0A=0A=09Planning on Elkhar=
t in the Spring. Any ideas?=0A=0A=09Thanks=0A=0A=09Dave and Alex Amys=0A=
=0A=09

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<html><body><p>Finally got the GT6 back together and had it at Brainerd=
 for two track days.&nbsp; First day still had overheating issues even w=
ith the oil cooler, external octopus oiling and scirocco rad.&nbsp; Also=
 had a vibration in the rear.&nbsp; </p><p>Then we fabricated a full rad=
 shroud and re-did one of the 240Z rear axles.&nbsp; Lost all but a very=
 minor vibration that show up at around 100 MPH which might just be from=
 driving an 1800 lb car that fast.&nbsp; </p><p>Cured the overheating an=
d actually had to tape the rad and oil&nbsp;cooler.&nbsp; After many lap=
s the water was at 200 and the oil at 220.&nbsp; Outside temp 65-70 degr=
ees.</p><p>Our new problem is we burned the electrodes off of number 1 a=
nd 4 plugs. The other four looked a little lean, but not bad.&nbsp; We a=
re running 1.50 Strombergs.</p><p>It seems to me that the stock intake i=
s starving 1 and 4.&nbsp; </p><p>I've read that Kas drilled the&nbsp;flo=
at jets&nbsp;to cure starvation at high RPM's, but what about the main j=
ets.&nbsp; Will this cause serious bog at mid-RPM's.&nbsp; Also would re=
working the number 1 and 4 intake runners help the problem.&nbsp; We are=
 maxing out at 6000 RPM's.</p><p>As for the minor vibration, we have a r=
ebuilt,&nbsp;fully welded 3:89.&nbsp; </p><p>Planning on Elkhart in the=
 Spring. Any ideas?</p><p>Thanks</p><p>Dave and Alex Amys</p><p><br></p>=
<p>&nbsp;</p></body></html>

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_______________________________________________
[email-masked]

http://www.fot-racing.com

Archive: http://www.team.net/archive

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From: <[email-masked]>
Date: Fri, 16 Oct 2015 17:17:04 +0000

Can't you use the adjustable jets from the ZS carbs on a TR4?

Bob Kramer
[email-masked]

---- Bud R <[email-masked]> wrote: 
> “but what about the main jets."
> 
> 
> 
> ZS jets actually are adjustable, just not easily. The depth (from the bridge to the top of the jet) of the jets on my 175 ZS carbs can range from 0.085 to 0.187 inches. I have mine set at 0.125” deep. Don’t know if 150’s are the same but I suspect it’s close to the same.
> 
> To adjust take a 3/8 inch bolt and grind it flat on the bottom. Put two nuts on to lock your “depth setter” bolt and then tap the jet down to a measured depth (with your dial indicator). To move it up tap from the bottom with a Honda valve guide (or similar protection) to protect the jet. I’ve set the jets with the carbs still on the carb.
> 
> 0.085 is lean and 0.187 is rich so adjust accordingly. Be precise this is not a big range but it can make a difference.
> 
> 
> Bud Rolofson
> 
> Extreme Parts Racing (more than just a haircut)
> 
> 71TR6 CC57365 (Good 6)
> 71 Spitfire MK IV Race Car #3
> 69 Spitfire MK III (back up FE engine/dinghy car)
> 93 Minnie Winnie Race Support Vehicle 
> 77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> On Oct 15, 2015, at 2:12 PM, Kas Kastner <[email-masked]> wrote:
> 
> > Did you check the plugs after the overheating so that you know it was from fuel problems not the overheating??
> > 
> > What needles are you running? How far open is the adjusting nut for the mixture?
> > 
> > Never be beaten by equipment.
> > 
> > 
> > On Thu, Oct 15, 2015 at 6:42 AM, <[email-masked]> wrote:
> > Finally got the GT6 back together and had it at Brainerd for two track days.  First day still had overheating issues even with the oil cooler, external octopus oiling and scirocco rad.  Also had a vibration in the rear. 
> > 
> > Then we fabricated a full rad shroud and re-did one of the 240Z rear axles.  Lost all but a very minor vibration that show up at around 100 MPH which might just be from driving an 1800 lb car that fast. 
> > 
> > Cured the overheating and actually had to tape the rad and oil cooler.  After many laps the water was at 200 and the oil at 220.  Outside temp 65-70 degrees.
> > 
> > Our new problem is we burned the electrodes off of number 1 and 4 plugs. The other four looked a little lean, but not bad.  We are running 1.50 Strombergs.
> > 
> > It seems to me that the stock intake is starving 1 and 4. 
> > 
> > I've read that Kas drilled the float jets to cure starvation at high RPM's, but what about the main jets.  Will this cause serious bog at mid-RPM's.  Also would reworking the number 1 and 4 intake runners help the problem.  We are maxing out at 6000 RPM's.
> > 
> > As for the minor vibration, we have a rebuilt, fully welded 3:89. 
> > 
> > Planning on Elkhart in the Spring. Any ideas?
> > 
> > Thanks
> > 
> > Dave and Alex Amys
> > 
> > 
> > 
> >  
> > 
> > Donate: http://www.team.net/donate.html
> > Forums: http://www.team.net/forums
> > Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/[email-masked]
> > 
> > 
> > 
> > 
> > Donate: http://www.team.net/donate.html
> > Forums: http://www.team.net/forums
> > Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/[email-masked]
> > 
> > 
> 

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From: Bud R <[email-masked]>
Date: Fri, 16 Oct 2015 11:38:50 -0600

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I don=92t have any experience with TR4 ZS carbs so I=92m not sure. I=92ve =
only worked with TR6 era ZS carbs.

One would think they hadn=92t changed that much so that might work.

Bud=20

71TR6 CC57365 (Good 6)
71 Spitfire MK IV Race Car #3
69 Spitfire MK III (back up FE engine/dinghy car)
93 Minnie Winnie Race Support Vehicle=20
77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)

On Oct 16, 2015, at 11:17 AM, [email-masked] wrote:

>=20
>=20
> ---- Bud R <[email-masked]> wrote:=20
>> =93but what about the main jets."
>>=20
>>=20
>>=20
>> ZS jets actually are adjustable, just not easily. The depth (from the =
bridge to the top of the jet) of the jets on my 175 ZS carbs can range =
from 0.085 to 0.187 inches. I have mine set at 0.125=94 deep. Don=92t =
know if 150=92s are the same but I suspect it=92s close to the same.
>>=20
>> To adjust take a 3/8 inch bolt and grind it flat on the bottom. Put =
two nuts on to lock your =93depth setter=94 bolt and then tap the jet =
down to a measured depth (with your dial indicator). To move it up tap =
from the bottom with a Honda valve guide (or similar protection) to =
protect the jet. I=92ve set the jets with the carbs still on the carb.
>>=20
>> 0.085 is lean and 0.187 is rich so adjust accordingly. Be precise =
this is not a big range but it can make a difference.
>>=20
>>=20
>>=20
>>=20
>> 93 Minnie Winnie Race Support Vehicle=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>> On Oct 15, 2015, at 2:12 PM, Kas Kastner <[email-masked]> =
wrote:
>>=20
>>> Did you check the plugs after the overheating so that you know it =
was from fuel problems not the overheating??
>>>=20
>>> What needles are you running? How far open is the adjusting nut for =
the mixture?
>>>=20
>>>=20
>>>=20
>>> Finally got the GT6 back together and had it at Brainerd for two =
track days.  First day still had overheating issues even with the oil =
cooler, external octopus oiling and scirocco rad.  Also had a vibration =
in the rear.=20
>>>=20
>>> Then we fabricated a full rad shroud and re-did one of the 240Z rear =
axles.  Lost all but a very minor vibration that show up at around 100 =
MPH which might just be from driving an 1800 lb car that fast.=20
>>>=20
>>> Cured the overheating and actually had to tape the rad and oil =
cooler.  After many laps the water was at 200 and the oil at 220.  =
Outside temp 65-70 degrees.
>>>=20
>>> Our new problem is we burned the electrodes off of number 1 and 4 =
plugs. The other four looked a little lean, but not bad.  We are running =
1.50 Strombergs.
>>>=20
>>> It seems to me that the stock intake is starving 1 and 4.=20
>>>=20
>>> I've read that Kas drilled the float jets to cure starvation at high =
RPM's, but what about the main jets.  Will this cause serious bog at =
mid-RPM's.  Also would reworking the number 1 and 4 intake runners help =
the problem.  We are maxing out at 6000 RPM's.
>>>=20
>>> As for the minor vibration, we have a rebuilt, fully welded 3:89.=20
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/[email-masked]
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/[email-masked]
>>>=20
>>>=20
>>=20
>=20

--Apple-Mail=_125849AE-F25A-49AD-B3B4-FBF0BDD1E8F8
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dwindows-1252"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">I =
don=92t have any experience with TR4 ZS carbs so I=92m not sure. I=92ve =
only worked with TR6 era ZS carbs.<div><br></div><div>One would think =
they hadn=92t changed that much so that might =
work.</div><div><div><br><div apple-content-edited=3D"true"><span =
class=3D"Apple-style-span" style=3D"color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 18px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
text-align: -webkit-auto; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
border-collapse: separate; orphans: 2; widows: 2; border-spacing: 0px; =
-webkit-text-decorations-in-effect: none;"><div style=3D"word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;"><span class=3D"Apple-style-span" style=3D"orphans: =
2; text-align: -webkit-auto; text-indent: 0px; widows: 2; =
-webkit-text-decorations-in-effect: none;"><div style=3D"word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;"><span class=3D"Apple-style-span" style=3D"orphans: =
2; text-align: -webkit-auto; text-indent: 0px; widows: 2; =
-webkit-text-decorations-in-effect: none;"><div style=3D"word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;"><span class=3D"Apple-style-span" style=3D"orphans: =
2; text-align: -webkit-auto; text-indent: 0px; widows: 2; =
-webkit-text-decorations-in-effect: none;"><div style=3D"word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;"><span class=3D"Apple-style-span" style=3D"orphans: =
2; text-align: -webkit-auto; text-indent: 0px; widows: 2; =
-webkit-text-decorations-in-effect: none;"><div style=3D"word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;"><span class=3D"Apple-style-span" style=3D"orphans: =
2; text-align: -webkit-auto; text-indent: 0px; widows: 2; =
-webkit-text-decorations-in-effect: none;"><div style=3D"word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;"><span class=3D"Apple-style-span" style=3D"orphans: =
2; text-indent: 0px; widows: 2; -webkit-text-decorations-in-effect: =
none;"><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space;"><span class=3D"Apple-style-span" =
style=3D"orphans: 2; text-indent: 0px; widows: 2; =
-webkit-text-decorations-in-effect: none;"><div><div =
style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; text-transform: =
none; white-space: normal; word-spacing: 0px; border-spacing: 0px; =
-webkit-text-stroke-width: 0px;">Bud&nbsp;</div><div =
style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; text-transform: =
none; white-space: normal; word-spacing: 0px; border-spacing: 0px; =
-webkit-text-stroke-width: 0px;"><br></div><div style=3D"border-collapse: =
separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: =
normal; font-variant: normal; font-weight: normal; letter-spacing: =
normal; line-height: normal; text-transform: none; white-space: normal; =
word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-width: =
0px;">Extreme Parts Racing&nbsp;(more than just a haircut)</div><div =
style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; text-transform: =
none; white-space: normal; word-spacing: 0px; border-spacing: 0px; =
-webkit-text-stroke-width: 0px;"><br></div><div>71TR6 CC57365 (Good =
6)</div><div style=3D"border-collapse: separate; color: rgb(0, 0, 0); =
font-family: Helvetica; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
text-transform: none; white-space: normal; word-spacing: 0px; =
border-spacing: 0px; -webkit-text-stroke-width: 0px;">71 Spitfire MK IV =
Race Car #3</div><div style=3D"border-collapse: separate; color: rgb(0, =
0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
text-transform: none; white-space: normal; word-spacing: 0px; =
border-spacing: 0px; -webkit-text-stroke-width: 0px;">69 Spitfire MK III =
(back up FE engine/dinghy car)</div><div style=3D"border-collapse: =
separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: =
normal; font-variant: normal; font-weight: normal; letter-spacing: =
normal; line-height: normal; text-transform: none; white-space: normal; =
word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-width: =
0px;">93 Minnie Winnie Race Support Vehicle&nbsp;</div><div =
style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; text-transform: =
none; white-space: normal; word-spacing: 0px; border-spacing: 0px; =
-webkit-text-stroke-width: 0px;">77 Z-50A Hardly Davidson Honda =
Mini-Trail Bike (Triumph Pit Bike)</div></div><div =
style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
text-transform: none; white-space: normal; word-spacing: 0px; =
border-spacing: 0px; -webkit-text-stroke-width: 0px;"><br></div><div =
style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
text-transform: none; white-space: normal; word-spacing: 0px; =
border-spacing: 0px; -webkit-text-stroke-width: =
0px;"><br></div></span></div></span></div></span></div></span></div></span=
></div></span></div></span></div></span>
</div>
<br><div><div>On Oct 16, 2015, at 11:17 AM, <a =
href=3D"mailto:[email-masked]">[email-masked]</a> =
wrote:</div><br class=3D"Apple-interchange-newline"><blockquote =
type=3D"cite">Can't you use the adjustable jets from the ZS carbs on a =
TR4?<br><br>Bob Kramer<br><a =
href=3D"mailto:[email-masked]">[email-masked]</a><br><br>-=
--- Bud R &lt;[email-masked]&gt; wrote: <br><blockquote =
type=3D"cite">=93but what about the main jets."<br><br><br><br>ZS jets =
actually are adjustable, just not easily. The depth (from the bridge to =
the top of the jet) of the jets on my 175 ZS carbs can range from 0.085 =
to 0.187 inches. I have mine set at 0.125=94 deep. Don=92t know if 150=92s=
 are the same but I suspect it=92s close to the same.<br><br>To adjust =
take a 3/8 inch bolt and grind it flat on the bottom. Put two nuts on to =
lock your =93depth setter=94 bolt and then tap the jet down to a =
measured depth (with your dial indicator). To move it up tap from the =
bottom with a Honda valve guide (or similar protection) to protect the =
jet. I=92ve set the jets with the carbs still on the carb.<br><br>0.085 =
is lean and 0.187 is rich so adjust accordingly. Be precise this is not =
a big range but it can make a difference.<br><br><br>Bud =
Rolofson<br><br>Extreme Parts Racing (more than just a =
haircut)<br><br>71TR6 CC57365 (Good 6)<br>71 Spitfire MK IV Race Car =
#3<br>69 Spitfire MK III (back up FE engine/dinghy car)<br>93 Minnie =
Winnie Race Support Vehicle <br>77 Z-50A Hardly Davidson Honda =
Mini-Trail Bike (Triumph Pit =
Bike)<br><br><br><br><br><br><br><br><br><br><br><br><br>On Oct 15, =
2015, at 2:12 PM, Kas Kastner &lt;[email-masked]&gt; =
wrote:<br><br><blockquote type=3D"cite">Did you check the plugs after =
the overheating so that you know it was from fuel problems not the =
overheating??<br><br>What needles are you running? How far open is the =
adjusting nut for the mixture?<br><br>Never be beaten by =
equipment.<br><br><br>On Thu, Oct 15, 2015 at 6:42 AM, =
&lt;[email-masked]&gt; wrote:<br>Finally got the GT6 back together =
and had it at Brainerd for two track days. &nbsp;First day still had =
overheating issues even with the oil cooler, external octopus oiling and =
scirocco rad. &nbsp;Also had a vibration in the rear. <br><br>Then we =
fabricated a full rad shroud and re-did one of the 240Z rear axles. =
&nbsp;Lost all but a very minor vibration that show up at around 100 MPH =
which might just be from driving an 1800 lb car that fast. <br><br>Cured =
the overheating and actually had to tape the rad and oil cooler. =
&nbsp;After many laps the water was at 200 and the oil at 220. =
&nbsp;Outside temp 65-70 degrees.<br><br>Our new problem is we burned =
the electrodes off of number 1 and 4 plugs. The other four looked a =
little lean, but not bad. &nbsp;We are running 1.50 =
Strombergs.<br><br>It seems to me that the stock intake is starving 1 =
and 4. <br><br>I've read that Kas drilled the float jets to cure =
starvation at high RPM's, but what about the main jets. &nbsp;Will this =
cause serious bog at mid-RPM's. &nbsp;Also would reworking the number 1 =
and 4 intake runners help the problem. &nbsp;We are maxing out at 6000 =
RPM's.<br><br>As for the minor vibration, we have a rebuilt, fully =
welded 3:89. <br><br>Planning on Elkhart in the Spring. Any =
ideas?<br><br>Thanks<br><br>Dave and Alex =
Amys<br><br><br><br><br><br>______________________________________________=
_<br>[email-masked]<br><br>http://www.fot-racing.com<br><br>Donate: =
http://www.team.net/forums<br>Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/[email-masked]<br><br><br>=
<br><br>_______________________________________________<br>[email-masked].=
net<br><br>http://www.fot-racing.com<br><br>Donate: =
http://www.team.net/forums<br>Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/[email-masked]<br><br><br>=
</blockquote><br></blockquote><br></blockquote></div><br></div></div></bod=
y></html>=

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From: <[email-masked]>
Date: Fri, 16 Oct 2015 19:30:57 +0000

I haven't done it myself since I use SU's but the process is detailed in Len Renkenberger's Six Tech manual which can be found online at this link:

http://www.74tr6.com/pdfs/6-TECH%20Complete.pdf

When I started working on cars way, way back when Len's book was an incredible resource coming out of 6-Pack. Look over the differential rebuild section if you want to understand how to rebuild a diff.

Bob Kramer
[email-masked]

---- Bud R <[email-masked]> wrote: 
> I don’t have any experience with TR4 ZS carbs so I’m not sure. I’ve only worked with TR6 era ZS carbs.
> 
> One would think they hadn’t changed that much so that might work.
> 
> Bud 
>