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<DIV><FONT size=2 face=Arial> I'll try this again. am having
trouble sending to fot. </FONT></DIV>
<DIV><FONT size=2 face=Arial> The f-16 emulsion tube is a very lean
tube, it is often hard to get a rich enough mixture with this emulsion tube. Try
using f-11 or even f-2 emulsion tubes. Start out with 145 main jets and 165 air
correction jets. This should get you close. The 36mm chokes should work fine. On
my Morgan with a 2187cc full race engine I use 40 mm chokes & every time we
went bigger we made more power with no loss on the bottom or an rpm range that
is 4,000 to 6800 rpm on the track. </FONT></DIV>
<DIV><FONT size=2 face=Arial> The pump jets are
probably to large. Try 35 pump jets and install pump inlet valves with a 70
bleed hole in their side. The pump jets acts as part of the "high speed
enrichment" circuit of the carb at high rpm at WOT. I think that the idle
jets are also to large. Try 45 f8 or 45 f6 idle jets. The idle jet size is
correct when the best lean idle is achieved with the idle mixture screw between
1/2 and 3/4 turns out from fully seated. You may even be able to go down
to a 40 f6 idle jet. This will help prevent plug fouling around the pits and on
the pregrid. </FONT></DIV>
<DIV><FONT size=2 face=Arial> Ignition timing
should probably end up around 32 degrees total mechanical advance with the
engine running at 4,000 rpm and higher. </FONT></DIV>
<DIV><FONT size=2 face=Arial> Make sure you have
cold enough plugs in the engine. I should probably use the equivelant of
Champion C61YC or C59YC racing plugs if the CR is 12.5:1. C59yc on the
dyno, c61yc on the track. </FONT></DIV>
<DIV><FONT size=2
face=Arial>
Good Luck, </FONT></DIV>
<DIV><FONT size=2
face=Arial>
Greg Solow</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=fot@autox.team.net href="mailto:fot@autox.team.net">Van Mulders
Marcel via Fot</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=fot@autox.team.net
href="mailto:fot@autox.team.net">fot@autox.team.net</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, December 29, 2016 1:45
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Fot] TR6 race engine with
45DCOE triple Webers</DIV>
<DIV><BR></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=885500321-29122016>The engine for a
friend's TR6 racecar is finished at last and it has run a couple of
times now.</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=885500321-29122016>I have a problem
with the mixture : the air correction jets are 155, I started with 140 main
jets but the mixture was much too lean : AFR was 14 at idle and 17 at
5000 rpm. Even with 180 main jets, the AFR is still 15 at 4000 -
5000 rpm. The engine is 2720 cc and 12.6 volumetric CR.</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=885500321-29122016>The Webers are
secondhand, 45DCOE type 152 and they look as new</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=885500321-29122016>The venturis are
36mm, emulsion tubes are F16, idle jets 55F8 and aux. venturis are 4.5. Pump
jets are 40 without a bleed hole. The plugs have a correct colour, no
sooting, no signs of overheating. The engine is on a dyno but I didn't risk so
far to really load the engine, so the plugs doesn't tell much. The lambda
sensor is a wide Bosch sensor, about new and with an Innovate controller. I
suppose 180 main jets are already too big. I can't find any air leaks and the
spark plugs have all the same colour. Is it possible that 36mm chokes are too
big? Any idea's why the mixture can be too lean, even with 180 main jets?
Should I suspect the lambda sensor/Innovate controller? What venturis
should I start with? </SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=885500321-29122016>Another question :
I have no experience about the range of total ignition advance a full race TR6
engine does need.</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN class=885500321-29122016>Marcel
</SPAN></FONT></DIV>
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