[6pack] Carburetor problems?

[John North]

Thanks for the help, Dick...

The A/F monitor is showing rich at all speeds.   The only time it
differs is when I floor it at low rpms in any gear when it goes off
the chart at lean.   I have a sensor on each exhaust pipe and a switch
to check each carb, they both show almost the same, one might be a
hair leaner.

I will change the dashpot oil and check the springs.   I think i have
some spares.   Also will check advance.

John

On Tue, Jun 1, 2010 at 2:37 AM, Sally or Dick Taylor
<tr6taylor at webtv.net> wrote:
> John---Does the A/F monitor show full rich only at idle speeds? If so, does
the monitor then recover into the rich area after rpm picks up? I need this
info to give more help! Meanwhile, I'll just guess as to the problem and
possible solutions.
>
> a) The air valves are flying open because the oil in the dashpots is too
thin.
>
> b) The springs that help to keep the airvalve from coming up too fast are
either missing or weak.
>
> c) One carburetor is running too lean, but the monitor is sensing richness
because the other one is too rich. (Measure the diameter of the needles right
where they exit the air valves. They should be identical.
>
> d) While the needles may be too rich at idle, they are not thin enough just
off idle. (Your monitor is showing you the lean condition)
>
> e) Be sure the ign. timing is advancing and following the engine speed.
>
> There could be other problems, but making this list longer won't "get it
through"!
>
> Dick
>
>
> -----Original Message-----
> From: John North
> Sent: Monday, May 31, 2010 4:35 PM
> To: Triumph 6 Pack
> Subject: [6pack] Carburetor problems?
>
> When I floor it at fairly low rpms, the engine coughs and splutters.
> Very embarrassing in the auto cross.   I have a K&N O2 sensor system
> installed, it normally shows quite rich (2 green bars), but when I
> floor it it goes to full lean until the engine recovers.   Timing is
> spot on, valves adjusted, gaps and points set, distributor rebuilt,
> new rotor, new wires.   Have swapped out the coil.   Carbs are
> balanced and set to mid range mix - two full turns from full rich,
> doesn't seem to make much difference where they are set, O2 sensor
> still shows well on the rich side and the engine stumbles horribly.
> Dashpot oil filled.
>
> This is a 76 with all the smog control equipment removed.   9.5-1
> compression, mild porting, Good GP2 cam
>
> Any suggestions?
>
> John North
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