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<DIV><FONT size=2 face=Arial>Marcel, on my TR6 race motor, I run total
advance of 37° at 3500 rpm's. I think that it is about 17° at idle.
It seems to me that when I ran Webbers on my TR6, I was using 40mm
chokes.</FONT></DIV>
<DIV>Charly Mitchel<BR>TR6 #44</DIV>----- Original Message ----- </DIV>
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<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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