[Fot] DCOE setup on stock tr6

[Bud Rolofson]

Hi Chris,

The mixture screws should be out 1 turn from lightly seated. You might be a little lean on the idle jet if it needs that extra 1/4 turn. It doesn’t take much too make a difference with the mixture screw. 

If the speed screw is more than 1/2 turn out from lightly touching the lever it may indicate a lean idle jet too. If the speed screw is turned much more than that you could be getting into the progression holes instead of the idle jet alone. The progression holes are there to make a smooth transition from the idle jet circuit to the main jet circuit. If you’re into the progression holes to make it idle correctly then it’s another indication that the idle jet is too lean as their function is to add gas to the mix.

As far as the bog on acceleration, pull the pump jets and see what size is in there. You may need to go smaller to decrease the volume and duration of the squirt of gas when accelerating. I had a bogging down problem upon acceleration and going from a 55 to a 40 pump jet solved that problem. I now run both the pump jet and the spill jet (exhaust jet) with size 40 jets.

Check the pump jets first, as it’s the easiest thing to do, then maybe look at a richer idle jet if that doesn’t help. You may have two things going on here, 1) the acceleration issue (the pump jets), and 2) the adjustments needed to the mixture and speed screws (the idle jet).

Good luck. It will be great once you get them right.

Bud


> On Nov 15, 2019, at 6:14 AM, chris panayotti via Fot <fot at autox.team.net> wrote:
> 
> Hi all, 
> 
> I ran across an archive on your site from a Robert Lang, looks like from December last year. So Taking a total shot in the dark emailing this. Anyway in the thread he talks about running triple DCOEs on a Canon manafold on a TR6 with stock cam and stock compression. I am trying to do the exact same. He mentioned toward the end that he would be willing to share knowledge on the jets and knowledge.
> 
> So here it goes, the main symptom I am running into currently is accleration off idle.  It starts up and idles pretty good with mixture screws all out about 1.25 turns. But bumping the throttle at that point either load or no load bogs bigtime, bassically kills the engine if I hold it, even if I go very slowly. I did manage to get it to a point where it revs so so if I keep bumping it fast with no load, but with any load at all it bogs and dies.  I've come to the conclusion my progression circuit is to blame and that operates off the idle jet, of which all are currently 50F11.
> 
> I've gone over all the valve timing with a fine toothed comb and verified a stock cam by checking the lift. All valve gaps are perfect At .010".  I removed the vacuum retard from the distributor and am running it at 12deg BTDC right now, and the mechanical advance does work and brings it up to 24ish deg.  It is a stock points distributor by the way.  I've read a few people mention that I need to upgrade that but others have successfully used it also. I've checked compression all are close and above 125psi.
> 
> Any help or insight would be GREATLY appreciated. I've been trying to get this to run right for weeks. I keep crossing things off the list but still haven't gotten it right. I'm still concerned about the distributor but it seems well enough that it should run properly. I'm fairly confident it's a carb problem.
> 
> If you need any more info about my setup please ask
> 
> Thank you
> Chris Panayotti
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Bud Rolofson

Extreme Parts Racing (more than just a haircut)

71TR6 CC57365 (Good 6)
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