<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">What a curious problem. Were your manifolds manufactured for use with Weber DCOEs or were they adapted from some other application?<div class=""><br class=""><div class="">
<div class="">Duncan Charlton</div><div class="">Elgin, Texas USA</div><div class=""><br class=""></div><br class="Apple-interchange-newline">
</div>
<br class=""><div><blockquote type="cite" class=""><div class="">On Jan 1, 2017, at 6:03 AM, Marcel Van Mulders via Fot <<a href="mailto:fot@autox.team.net" class="">fot@autox.team.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" align="left" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><font color="#0000ff" size="2" face="Arial" class=""><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" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><font color="#0000ff" size="2" face="Arial" class=""><span class="292535311-01012017">Are we in 2017 now?</span></font></div><div dir="ltr" align="left" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><font color="#0000ff" size="2" face="Arial" class=""><span class="292535311-01012017">Marcel</span></font></div><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><div lang="nl" class="OutlookMessageHeader" dir="ltr" align="left" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><hr tabindex="-1" class=""><font size="2" face="Tahoma" class=""><b class="">Van:</b><span class="Apple-converted-space"> </span>Greg Solow [<a href="mailto:Gregmogdoc@surfnetusa.com" class="">mailto:Gregmogdoc@surfnetusa.com</a>]<span class="Apple-converted-space"> </span><br class=""><b class="">Verzonden:</b><span class="Apple-converted-space"> </span>zaterdag 31 december 2016 01:48<br class=""><b class="">Aan:</b><span class="Apple-converted-space"> </span>Van Mulders Marcel; <a href="mailto:fot@autox.team.net" class="">fot@autox.team.net</a><br class=""><b class="">Onderwerp:</b><span class="Apple-converted-space"> </span>Re: [Fot] TR6 race engine with 45DCOE triple Webers<br class=""></font><br class=""></div><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""></div><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><font size="2" face="Arial" class="">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.<span class="Apple-converted-space"> </span></font></div><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><font size="2" face="Arial" class=""> 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.<span class="Apple-converted-space"> </span></font></div><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><font size="2" face="Arial" class=""> 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 style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><font size="2" face="Arial" class=""> Good Luck, </font></div><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><font size="2" face="Arial" class=""> Greg Solow <span class="Apple-converted-space"> </span></font></div><blockquote style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); padding-left: 5px; margin-left: 5px; border-left-color: rgb(0, 0, 0); border-left-width: 2px; border-left-style: solid; padding-right: 0px; margin-right: 0px;" class="" type="cite"><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial;" class="">----- Original Message -----</div><div style="background-color: rgb(228, 228, 228); font-style: normal; font-variant-caps: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; background-position: initial initial; background-repeat: initial initial;" class=""><b class="">From:</b><span class="Apple-converted-space"> </span><a title="fot@autox.team.net" href="mailto:fot@autox.team.net" class="">Van Mulders Marcel via Fot</a></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial;" class=""><b class="">To:</b><span class="Apple-converted-space"> </span><a title="fot@autox.team.net" href="mailto:fot@autox.team.net" class="">fot@autox.team.net</a></div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial;" class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>Thursday, December 29, 2016 1:45 PM</div><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial;" class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>[Fot] TR6 race engine with 45DCOE triple Webers</div><div class=""><br class=""></div><div class=""><font size="2" face="Arial" class=""><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 class=""><font size="2" face="Arial" class=""><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 class=""><font size="2" face="Arial" class=""><span class="885500321-29122016">The Webers are secondhand, 45DCOE type 152 and they look as new</span></font></div><div class=""><font size="2" face="Arial" class=""><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 class="Apple-converted-space"> </span></span></font></div><div class=""><font size="2" face="Arial" class=""><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 class=""><font size="2" face="Arial" class=""><span class="885500321-29122016">Marcel<span class="Apple-converted-space"> </span></span></font></div><div class=""><br class="webkit-block-placeholder"></div><hr class=""><div class=""><br class="webkit-block-placeholder"></div>_______________________________________________<br class=""><a href="mailto:fot@autox.team.net" class="">fot@autox.team.net</a><br class=""><br class="">http://www.fot-racing.com<br class=""><br class="">Donate: http://www.team.net/donate.html<br class="">Archive: http://www.team.net/archive<br class="">Forums: http://www.team.net/forums<br class="">Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/gregmogdoc@surfnetusa.com<br class=""><br class=""><br class=""></blockquote><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); float: none; display: inline !important;" class="">_______________________________________________</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); float: none; display: inline !important;" class=""><a href="mailto:fot@autox.team.net" class="">fot@autox.team.net</a></span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); float: none; display: inline !important;" class=""><a href="http://www.fot-racing.com" class="">http://www.fot-racing.com</a></span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); float: none; display: inline !important;" class="">Donate: <a href="http://www.team.net/donate.html" class="">http://www.team.net/donate.html</a></span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); float: none; display: inline !important;" class="">Archive: <a href="http://www.team.net/archive" class="">http://www.team.net/archive</a></span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); float: none; display: inline !important;" class="">Forums: <a href="http://www.team.net/forums" class="">http://www.team.net/forums</a></span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); float: none; display: inline !important;" class="">Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/duncan.charlton54@gmail.com" class="">http://autox.team.net/mailman/options/fot/duncan.charlton54@gmail.com</a></span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""></div></blockquote></div><br class=""></div></body></html>