<div dir="ltr">I don't want to get to close to this, but spitting through the <span>carb</span> is not an unknown phenomenon and my answer is " SO WHAT?.". Full throttle at speed RPM that is another deal, but who cares at slightly over idle. That cam is a long way from a hot race cam even at 300 degrees duration and the overlap is making you worry. DON'T WORRY about it. </div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><p><strong><font color="#000099">Never be beaten by equipment.</font></strong></p></div></div>
<br><div class="gmail_quote">On Sun, Aug 23, 2015 at 5:59 PM, J.C. Hassall <span dir="ltr"><<a href="mailto:jhassall@gmail.com" target="_blank">jhassall@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Tnx Tony. I neglected to say that the Isky 777 was degrees bang-on. My first thought was the cam but am sure it's ok.<br>
<br>
It's only had the Webers and I don't have SUs to try. I am running shorty air horns (to fit inside the filters).<br>
<br>
Valves are set right and no manifold leak detected by spraying carb cleaner around the manifold.<br>
<br>
jim<br>
<br>
Fat-thumbed from my iPhone<br>
<br>
> On Aug 23, 2015, at 8:41 PM, Tony Drews <<a href="mailto:tony@tonydrews.com">tony@tonydrews.com</a>> wrote:<br>
><br>
> I run slightly larger mains and smaller air correction - 36 chokes. I think you're in the range on mains.<br>
><br>
> New engine? Run OK with other carbs but not with the Webers? Are you sure your cam is timed right (that's the first thing that came to mind - mis-timed cam)? Intake manifold properly seated? Valve adjustment OK?<br>
><br>
> There will be a certain amount of "standoff" where there's an atomized fuel cloud at the entrance to the carb and that's not abnormal.<br>
><br>
> I run air horns to manage the air flow and try to keep that cloud of gas in the carb.<br>
><br>
> Cheers, Tony Drews<br>
><br>
> At 07:14 PM 8/23/2015, J.C. Hassall wrote:<br>
>> My TR4 spits thru the 40DCOEs at idle and speed. Timing is set to 32 degrees at 3K RPM, so idle is about 12 degrees. I thought that spitting thru the carbs meant too much advance, but I believe timing is ok.<br>
>><br>
>> The AFR (sensor is in the 4-1 collector - bad idea) at idle jumps between 13.8 and 15.3 (seems like an enormous swing!). Spitting doesn't seem to coincide with any specific AFR. The carbs have been synched, etc.  34 chokes, 50F9 idle jets, mains are 120 with 200 air correctors. The mains seem awfully small. Even so, the AFR at speed is 12.8-13.5. Plugs are NGK BP6HS, which are sooty; the ground lug burns clean about half way.<br>
>><br>
>> What am I doing wrong??? I'm at the end of my wit (you're right Craig, it's a very short walk)<br>
>><br>
>> tnx<br>
>><br>
>> jim<br>
>><br>
>> 63 TR4 in autox prep, 99.5% finished, 90% to go<br>
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