Gergo -
The BN4 H4 carb has a two bolt mount which, if bolted too tight to the
head, can introduce vacuum leaks in and around the gaskets and spacers
and what not (too tight can result in warping of surfaces).
The surfaces of all the various bits should be flat and clean, and the
nuts tightened with 30ish ft-lbs of torque only.
Check that ...
Alan
On 7/1/11, Austin Healey <pajtamuvek@gmail.com> wrote:
> "It sounds to me like you have a vacuum leak somewhere. Remind me,
> what model/year do you have?"
>
> BN4 1958 - somehow skipped this question.
>
> 2011/6/30 Alan Seigrist <healey.nut@gmail.com>
>
>> It sounds to me like you have a vacuum leak somewhere. Remind me,
>> what model/year do you have?
>>
>> Alan
>>
>> On 6/30/11, Austin Healey <pajtamuvek@gmail.com> wrote:
>> > Hi Alan,
>> >
>> > Thanks! The exhaust is clean. Also checked the plugs, they are clean and
>> not
>> > dark. The engines does not hesitates on acceleration, but has some
>> roughness
>> > below 2.5 if the throttle is held in position going on flat ground.
>> Especial
>> > can feel it is decelerating. Not that bad, but still present. The carb
>> > is
>> > very sensitive on the mixture adjustment. As small as 1/4 turn can make
>> > difference in reading and feel. Not something I am used to on mini
>> engines.
>> > I have bought a set of different advance springs. Though the advance is
>> > working (each), I will experiment with the different springs tomorow.
>> >
>> > Gergo
>> >
>> > 2011/6/29 Alan Seigrist <healey.nut@gmail.com>
>> >
>> >> Gergo -
>> >>
>> >> The trick is the exhaust should not have a "smell" and should not show
>> >> smoke. If it smells rich or shows smoke, the mixture is off. Check
>> >> timing and make sure advance weights are operating and vacuum advance
>> >> lines are hooked up and operating.
>> >>
>> >> Let is know how it is going.
>> >>
>> >> Alan
>> >>
>> >>
>> >> On 6/29/11, Austin Healey <pajtamuvek@gmail.com> wrote:
>> >> > Thanks everybody for the knd words!
>> >> > I did my first Healey-miles today. Tha car is running well soo far. A
>> >> little
>> >> > oil from the valve cover gasket and the oil filter case, but no
>> horror.
>> >> > After a few joyfull miles came the rain and stopped the fun. Such is
>> >> life.
>> >> > I have some questions though. When shall I retorque the head?
>> >> > I have started to adjust the carbs with a WBO. Starange, but the car
>> is
>> >> not
>> >> > realy willing to run on afr 1.47. For proper smooth running it needs
>> >> > slightly rich mixture of about afr 12.5-13.5. Is it normal? If I
>> weaken
>> >> the
>> >> > mixture it begings to run rough. I measure the afr at each downpipe
>> just
>> >> > below the manifold. The timing has little impact on it.
>> >> >
>> >> > Gergo
>> >> >
>> >> > PS: Healey forever.
>> >> >
>> >>
>> >> --
>> >> Sent from my mobile device
>> >>
>> >
>>
>> --
>> Sent from my mobile device
>>
>
--
Sent from my mobile device
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