I agree with the weak mixture theory. Further evidence is a hole in a piston,
which is also a symptom of a lean condition. I would make sure the mixture is
correct immediately. Even if it doesn't cure the problem it is cheap insurance
against further engine damage.
Bill Lawrence
> Date: Wed, 16 Sep 2009 11:36:39 +0200
> From: coudesluijs@chello.nl
> To: Paull@glasgows.co.uk
> CC: healeys@autox.team.net
> Subject: Re: [Healeys] No acceleration
>
> Sounds like a weak mixture.
> What happens if you lift the pistons of the SU's about 1mm while running
> stationary?
> What oil do you use in the dash pots? Should be ATF or 3in1, not 20W50.
> Any leaks in the vacuumlines/manifold?
> Kees Oudesluijs
> NL
>
>
> Paul Leeks schreef:
> > Chaps
> >
> > I cannot seem to get the engine of my 100/6 BN4 running at all well.
> > About six months ago, whilst thrashing the old thing along the motorway,
I
> > managed to blow a large hole in piston #5.
> > This was undoubtedly caused by detonation (the timing was along way
out!).
> > Since then I have rebuilt the engine with new pistons and exhaust valves.
> > On start up everything fired up fine first time and the engine turns over
> > nice and smooth at idle.
> > However, although the car will cruise nicely up to 3,000 rpm (the fastest
I
> > want to go whilst running in), it has no power whatsoever; coughing and
> > spluttering on acceleration.
> > I have checked the timing (with a strobe light) and checked and oiled the
> > distributor weights, changed the points, condenser and rotor arm.
> > I have also changed the coil.
> > I have checked the gaps on the valves and the new spark plugs.
> > I have cleaned out and reoiled the carburettors and adjusted and
readjusted
> > the carburettors (with colourtune) several times to no avail.
> > I have cleaned and oiled the air filters (although these are currently
not
> > fitted).
> >
> > What else can I check? All suggestions will be very gratefully received
:-)
> >
> > Many thanks
> > Paul Leeks
> > Lancashire UK
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