[Healeys] Fuel Mixture

[Austin Healey]

The engine is fairly fresh, now with about 700miles since the rebuild.
The engine is running nice on lambda 0.9 in the whole range. On hard
acceleration the mixture is 0.8-0.85.
The engine is still sensitive on the mixture. It is fast to backfire and run
rough if the choke is pushed in too soon, especialy on colder days.

Being honest I never had engines which needed significantly weaker mixture
after running in, but we will see.
If I ever build another Healey, I will check and report on it.

Gergo

2011/10/11 Alan Seigrist <healey.nut at gmail.com>

> Gergo -
>
> Your motor is fresh off a rebuild, correct?  I would expect settings
> to change slightly as the rings bed in, you should be able to set
> leaner with time.
>
> Regards,
>
> Alan
>
> On 10/11/11, Austin Healey <pajtamuvek at gmail.com> wrote:
> > I set my BN4 with a wide band oxigen sensor, where I could track the
> mixture
> > under all driving conditons. I found that my engine would only run good
> on
> > rich mixture. Much richer than the stochiometric ratio. I tried
> everithing
> > to adjust the mixture weaker like new needles, springs, different fuel
> > levels, ignition timing etc, with no use. My carbs are completely rebuilt
> > units. I concluded with a richer mixture, and the car is running fine
> with
> > smooth idle and instant rev pickup. Soo I had to accept this richer
> mixture
> > as appropriet.
> > Sparks look normal after a run, but if I let it idle for longer, they get
> > darker.
> >
> > Gergo
> >
> > 2011/10/11 Keith Bailey <keithbailey5 at bigpond.com>
> >
> >>    Hi All
> >>            On my BT7 when I do a tune up the plugs always appear sooty
> >> indicating it is running rich
> >>            However when I clean the plugs clean and adjust the points
> >> Remove
> >> the three air cleaners
> >>            balance the carbs adjust the mixture screw  lift the piston
> >> with
> >> raising pin the engine wants to stall.
> >>            The car drive good engine perform as expected. However when
> on
> >> a
> >> trailing throttle down steep hill
> >>            I get a burbling through toe exhaust Which would indicate to
> me
> >> that the mixture is about right
> >>            But I cannot explain the sooty plugs. The engine does not
> burn
> >> or
> >> use oil any suggestions would
> >>            be appreciated
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