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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div dir=3D"ltr"></div><div dir=3D"ltr">I g=
ot a CSI dizzy courtesy of JS Performance Motoring for my Spit race car. &nb=
sp;I ordered a Pertronix coil to go with the CSI from Amazon, because O=E2=80=
=99Reiley said it would take a couple weeks to get one=E2=80=A6</div><div di=
r=3D"ltr"><br></div><div dir=3D"ltr">Once I got it, i Ran it in my Spit Race=
car, it ran well for a couple sessions & then wouldn=E2=80=99t restart f=
or my next session. Went thru everything in the paddock with Jason Suk=
ey and it turned out bad coil! Put Marty Sukey=E2=80=99s spare vintage=
Bosch coil on and all was great again.</div><div dir=3D"ltr"><br></div><div=
dir=3D"ltr">Called Pertronix, because the return window had expired w/ Amaz=
on. Pertronix initially was not going to send me a replacement, I pres=
sed and they agreed to a replacement after telling me Amazon is not an autho=
rized reseller.</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">It took 7 w=
eeks and a few follow-up calls to get the replacement. It is now a spare. &n=
bsp;I put a Lucas Gold in=E2=80=A6we=E2=80=99ll see how it does.</div><div d=
ir=3D"ltr"><br></div><div dir=3D"ltr">Terry</div><div dir=3D"ltr"><br></div>=
<div dir=3D"ltr"><br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr"><br><=
/div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Aug 14, 2024, at 16:0=
8, Andrew Devenish via Fot <fot@autox.team.net> wrote:<br><br></blockq=
uote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8">
I thought an update might be in order.
<div>Thank you for all the suggestions and ideas. Spoiler - still not fixed.=
</div>
<div>I have removed and cleaned out the bowl/jet lines, the front had black d=
ebris, but I don=E2=80=99t think it was enough to block the line, and it did=
not fix the problem.</div>
<div>Fuel pump. I have checked pressure and delivery from the pump, all is w=
ell. I have now changed to a smaller capacity positive displacement design a=
s there was concern over interaction of the internal and external pressure r=
egulators. Still not fixed.</div>
<div>Could not find any vacuum leak. I=E2=80=99ve had the manifolds off and b=
ack on since this issue has been around with no change. </div>
<div><br>
</div>
<div>A couple of replies were pretty confident that I have an ignition vs fu=
el issue. As I can=E2=80=99t find any fuel issue, I now suspect they may be r=
ight. I run Petronix ignitor 1149 with their coil 40611. This is the correct=
3ohm set up per Pertronix.</div>
<div> I purchased a new coil from Amazon - but the replacement coil was=
defective and had a misfire from the start which I could ABA with the old c=
oil. Talking with Pertronix the were concerned my new part was not theirs, a=
nd maybe a cheap copy - I returned
to Amazon, now waiting on a coil from Pertronix direct.</div>
<div>As I=E2=80=99m playing with ignition now, what are you guys using for s=
ignal and for coil with good success ? </div>
<div>Thank you for the advice and support - it will be sorted.</div>
<div><br id=3D"lineBreakAtBeginningOfSignature">
<div dir=3D"ltr">Thank you,
<div> Andrew Devenish</div>
<div>
<div><br>
</div>
<div>Sent from my iPad</div>
</div>
</div>
<div dir=3D"ltr"><br>
<blockquote type=3D"cite">On Aug 9, 2024, at 5:10=E2=80=AFPM, Andrew Devenis=
h <gt6racer@msn.com> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type=3D"cite">
<div dir=3D"ltr">=EF=BB=BF Hi Mike,
<div> The first question is a good one. Th=
e car was built for autocross by a guy in Indiana who knew his stuff. Howeve=
r, I bought it from a guy who had bought it to run PIB, but knew nothing abo=
ut race engines. He had run it lean and holed #4. He told
me he had not changed anything, but that is turning out not to be the case.=
(I suspect it holed the piston because I found he had fitted gros jets with=
the float level way too low). </div>
<div> I rebuilt it to same mechanical spec. It ra=
n great but a little lean on the AAU needles for road course, so I=E2=80=99m=
now on AAA. It still runs great, unless it doesn=E2=80=99t =F0=9F=98=81.</d=
iv>
<div> The car has had this issue since I built it=
. At first I thought the obvious - float heights, needle/seat, regulator pre=
ssure etc etc but while it always runs great I have this issues after a few =E2=
=80=9Claps=E2=80=9D.</div>
<div> 2) The car had a Summit racing 3136 pump wh=
ich has around 90GPH and an internal blow off at 7PSI, my regulator is at 4 P=
SI. Today I had taken the pump apart and checked it but all looked OK. I fit=
ted a cheap solenoid pump in its place. Issue still
there.</div>
<div>I had checked both the Summit and now the solenoid pump for flow, there=
is plenty. </div>
<div> As I noted the float bowls are full when it quits r=
unning.</div>
<div> 3) Great point - could be what I have. I know the fuel le=
vel in the jets is fine when not running, but a poor flow from bowl to jet w=
ould change that when running. My O2 is in the collector, so I can=E2=80=99t=
be sure if it=E2=80=99s both carbs or just one. All 4
plugs look very similar, but that is possible as this =E2=80=9Clean=E2=80=9D=
condition is only for a few cycles before it stops - not enough to color th=
e plug. Will check when I can ( unfortunately a busy weekend coming up as I r=
ace sailboats too ). I=E2=80=99ve been thinking it
is heat related, but it could just as easily be time. When I tried to run a=
utocross it started to play up after 10 or so seconds of full throttle (whic=
h I can=E2=80=99t do in my yard). On autocross it would pull like crazy, the=
n go very flat, and then come back on,
repeat. Your idea would do just that ! </div>
<div> 4) always worth a check, but it would have to be somethin=
g that shows up only when hot. </div>
<div> 5) yes, compression good. Between 220 and 225 for all, me=
asured on crank with throttles open.</div>
<div><br>
</div>
<div> </div>
<div> Thanks also to the other responses that I re=
ceived, I didn=E2=80=99t cc all on my replies in order to reduce the clutter=
=E2=80=A6</div>
<div><br id=3D"lineBreakAtBeginningOfSignature">
<div dir=3D"ltr">Thank you,
<div> Andrew Devenish</div>
<div>
<div><br>
</div>
<div>Sent from my iPad</div>
</div>
</div>
<div dir=3D"ltr"><br>
<blockquote type=3D"cite">On Aug 9, 2024, at 3:51=E2=80=AFPM, Mike Harmuth &=
lt;ofracer@gmail.com> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type=3D"cite">
<div dir=3D"ltr">=EF=BB=BF
<div dir=3D"ltr">Hi Andrew, a couple of things to check.
<div>1st, is this a new problem? if so, what did you touch last?</div>
<div><br>
</div>
<div>2d Verify fuel flow, not just pressure i.e Gallons per hour? Disco=
nnect the fuel line at the carbs, and stick it into a 1 quart or one gallon c=
lean/clear bottle/jug. Turn the fuel pump on and time how long it takes to f=
ill (1 Qt/ 1Gal whatever size container
you're using). If you're getting more than 20 gallons per hour, the f=
low is OK. Set the bottle aside and let it settle out, look for particles, r=
ubber, fuel cell foam, dirt. If so, see where that's coming from. For exampl=
e, old fuel cell foam will break down
and clog the intake. When the pump turns off, the fuel in the lines drops b=
ack flushing the intake clear until next time. Fuel filter clean? Fuel press=
ure reg OK? Not just holding pressure (I run 3.5 on my HS4s) but actually se=
nding fuel down the line? The
gallons per hour test will indicate if you need to look into any of these a=
reas, if you're gelling enough fuel, more down the list for now.</div>
<div>link to flow and fuel requirements chart <a href=3D"https://histor=
icracinggroup.com/resources/Reference_Material/Canton/Fuel%20Consumption%20a=
nd%20Flow%20Quick%20Ref%20by%20CM%20Filters.pdf" originalsrc=3D"https://hist=
oricracinggroup.com/resources/Reference_Material/Canton/Fuel%20Consumption%2=
0and%20Flow%20Quick%20Ref%20by%20CM%20Filters.pdf" shash=3D"eu+gfNqMEXPjKNyb=
noYv+mPaFpc7Y3xwvbjj1dCZj9mXOwzFEdvO83cln16e3fulB4hy6xIDkCLyYFu9YfCTGwqjU3K5=
iTbURT5cBe8OLvC5tjcgcI2S+RATjmfdiLAxo2qdQGiNLwAQcCiTyvOTZEMPyF3aI52n/Famc5IH=
0uQ=3D">https://historicracinggroup.com/resources/Reference_Material/Canton/=
Fuel%20Consumption%20and%20Flow%20Quick%20Ref%20by%20CM%20Filters.pdf</a></d=
iv>
<div><br>
</div>
<div>3. A problem I had with an identical set up, was rubber hose break=
ing down and settling into the little box shaped well in the carb bowl w=
here the line to the jet connects. It's happened to me twice now, last t=
ime was in June with fairly new hose feeding
the carbs. It restricted the flow to the jet, even though the bowl was full=
. At high load, not enough fuel could get past the blockage.</div>
<div>
<div><IMG_20240630_112925914.jpg></div>
</div>
<div><br>
</div>
<div>4. Vacuum leak- Is there a crack or loose bolt on the intake manifold? W=
ith the engine running, spray carb cleaner around the manifold to block, car=
bs to manifold. A change in engine RPM means something was drawn in through a=
gap.<br>
</div>
<div><br>
</div>
<div>5. Compression check- Are all the cylinders within 5-10% of each other?=
</div>
<div><br>
</div>
<div>Happy hunting</div>
<div><br>
</div>
<div>mike h</div>
</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Fri, Aug 9, 2024 at 3:03=E2=80=AFPM=
Andrew Devenish via Fot <<a href=3D"mailto:fot@autox.team.net";>fot@autox=
.team.net</a>> wrote:<br>
</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l=
eft:1px solid rgb(204,204,204);padding-left:1ex">
Guys, <br>
My car ( 1300, 12.5:1 comp on Sunoco 110 r=
ace gas, dual HS4 ) is still giving me grief. I=E2=80=99ve chased all the th=
ings I can think of, but still same problem. It starts and runs great, but a=
fter a few laps of the yard ( 5-6, only 1000ft or so per up/down
lap, so quick accels then braking to turn ) it goes very lean ( I have O2 s=
ensor ) and stops. I=E2=80=99m running it without the hood for these test ru=
ns. It always stops at the entry to a turn.
<br>
I=E2=80=99ve been working on it a lot, so k=
now it has fuel pressure, and the float bowls are full of fuel. All plugs lo=
ok very similar. The needles (AAA) are the spring type, and the slides move f=
reely. I use ATF as fluid, but have tried 50 weight too.<br>
After a minute or so it will fire back up, but o=
nly run enough to get back to the shop before going lean again. If I pull ou=
t the choke it will run, but is unstable.
<br>
I have wrapped headers and a heat shield around t=
he carbs but they do still get hot.<br>
<br>
Any ideas ? Thinking to try some less volat=
ile fuel as it seems heat related and the Sunoco evaporates so fast !<br>
<br>
<br>
Thank you, <br>
Andrew Devenish<br>
<br>
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</blockquote>
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</div>
</blockquote>
</div>
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