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<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=292535311-01012017>Plugging the balance pipes (1/2" diameter
and between every inlet tract of the manifold) did solve the problem : at
WOT and 5000 rpm the AFR went down from some 16 with open
balance tubes to 10.2 with plugged tubes, both with 180 main jets
wich have now prooved to be too big. The cold engine does start easily
know. With the open balance pipes, I had to crank the engine a lot : the
engine was running a second and stopped. (accelerator pump). Probably every
single cylinder did suck mixture from the other inlet tracts too, via the
balance pipes, thus weakening the signal at its own Weber
tract?</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=292535311-01012017>Are we in 2017 now?</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=292535311-01012017>Marcel</SPAN></FONT></DIV><BR>
<DIV lang=nl class=OutlookMessageHeader dir=ltr align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>Van:</B> Greg Solow
[mailto:Gregmogdoc@surfnetusa.com] <BR><B>Verzonden:</B> zaterdag 31 december
2016 01:48<BR><B>Aan:</B> Van Mulders Marcel;
fot@autox.team.net<BR><B>Onderwerp:</B> Re: [Fot] TR6 race engine with 45DCOE
triple Webers<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><FONT size=2 face=Arial>The F-16 emulsion tube are very lean throughout the
rev range. try either f-2 or f-11 emulsion tubes. begin with 145 main
jets, and 165 air correction jets. the larger the air corrector, the
leaner the mixture. I think that the pump jets are to large. Try 35 pump jets
and pump inlet valves with a 70 bleed hole. The pump jets acts as part of the
"high speed enrichment system" but you need the bleed or else the pump squirts
in to much gas and can make the car bog or resitate coming out of corners. The
idle jets are to large the the cylinder size. Try 45 f-8 or 40 f-6 idle jets.
you may be able to go down to a 40 f-6 idle jet. This will help keep the engine
from fouling plugs around the pits. </FONT></DIV>
<DIV><FONT size=2 face=Arial> Part throttle
mixuture reading do not mean much to me. Most of my experience has been WOT on
the dyno where you want a "brake specific fuel consumption" figure of around .50
lbs of fuel per horsepower per hour. Part throttle operation has to do
withj "drivability" and not fouling plugs. You would generally want the engine
to run as lean at part throttle as it can run without constant backfiring in the
intake manifold. </FONT></DIV>
<DIV><FONT size=2 face=Arial> Make sure you
have spark plugs in the engine that are cold enough to work with the compression
ratio of the engine. An engine with 12.1:1 will need a Campion Racing plug
with a heat range number like C 61YC. On the dyno you might start with an
even colder plug like C59YC. just to make extra sure that you stay
away from detonation. After getting things more dialed in, you can probably go
to the warmer plug. </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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style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; PADDING-RIGHT: 0px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; 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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