Hi Friends,
With the most valuable help of the tech material I found on John Sim's site
(thanks John!), I was able to understand the overdrive operation throughly,
and soo found my problem: the oil pump has got stucked half-way down in its
bore and only had a limited movement. Thus it supplied insufficent oil for
the system. I have polished the piston, and voila: it is working! BTW is
there any trick to install the pump accuratly to meet the two holes drilled
for the two small bolts? I did it trial-and-error way, and it was quite time
consuming.
Have a nice sunday:
Gergo
2011/7/1 Austin Healey <pajtamuvek@gmail.com>
> I have a 12 port head and HD6s. I will check for leak, but fairly sure that
> there is no leak. Manifold leaks show their ill effect near idle - You set
> the mixture right and it gets weak as You go up. Not in my case. The mixture
> is ok on the full rev range, but when I floor it, it gets a bit weak (afr
> 14). No hesitation/missfire though, just not right. And only on the front
> carb. The rear is ok.
>
> Gergo
>
>
> 2011/7/1 Austin Healey <pajtamuvek@gmail.com>
>
>>
>>
>> 2011/7/1 Alan Seigrist <healey.nut@gmail.com>
>>
>>> 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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