Chris, you do not mention a lambda sensor and/or other equipment to read the
exhaust gases. Tuning Webers for a street car is more complex than for racing.
The idle jet has, apart from the fuel hole at the bottom, also an air bleed
hole on the side of the jet. The combination of this 2 holes is determining
the fuel/air mixture delivered at the progression holes. 1.5 turns from the
seats for the idle screw is pointing to a lean fuel/air mixture delivered to
the progression holes by the idle jets.
The acceleration jets should deliver a strong jet of fuel : as far as about 1/2
or 1 meter (when the carbs are not mounted). If you don't see this, maybe the
accelerator intake/discharge valves(not the accelerator pump jets) are not in
place in the bottom of the fuel chambers!
Marcel
----- Oorspronkelijk bericht -----
Van: "fot" <fot@autox.team.net>
Aan: "chris panayotti" <chrispanayotti@gmail.com>
Cc: "fot" <fot@autox.team.net>
Verzonden: Zaterdag 16 november 2019 08:40:00
Onderwerp: Re: [Fot] DCOE setup on stock tr6
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 doesnâ??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 youâ??re into the progression
holes to make it idle correctly then itâ??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 itâ??s the easiest thing to do, then maybe look
at a richer idle jet if that doesnâ??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@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)
71 Spitfire MK IV Race Car #3
69 Spitfire MK III (back up FE engine/dinghy car)
93 Minnie Winnie Race Support Vehicle
77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)
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