Patrick -
I am unfamiliar with the BN3 - if you have a BN3 shop manual I suggest you
refer to it. ;-)
One thought comes to mind... it sounds to me like you are getting
intermittent vapor lock, aggravated by more engine heat and more pump stress
from going up a hill.
Is your fuel pump in the same location as on a BN1 and BN2, i.e. directly
above the exhaust pipe on on the left hand side of the car? If so, I would
suspect this is your problem.
The solution is quite easy... I had a very similar problem with my BN1 until
I went out and bought some header tape and wrapped the pipe on the length
that ran under the fuel pump. This fixed the 'flutter' problem permanently.
The other potential cause is you might have rust in your tank and it is
clogging up your filters.... use a clear VW Beetle filter so you can see
what crud is in the tank.
Alan
'52 A90
'53 BN1
'64 BJ8
On 10/12/06, Quinn, Patrick <Patrick.Quinn@det.nsw.edu.au> wrote:
>
> G'day
>
> I took the BN3 for a 300 mile run yesterday to a race circuit south of
> Sydney. It makes for the perfect camera car out on the circuit giving
> the photographer 360 degree access.
>
> The the weather was fine and warm and getting a little hotter coming
> back in the arvo. It ran very well especially in the cooler morning but
> presented with a problem coming back.
>
> I think the best way to describe it would be fluttering. Those out there
> will recall that I have mentioned this before but while I thought I
> fixed it with a new fuel filter it has come back. We were driving along
> at just under 3K rpm in top OD and then on reaching a slight incline or
> hill the engine would start to flutter or stutter and there would be no
> power. After a short time it would clear itself and away we go.
>
> I spoke to Joe Armour and he thinks it's the carburettor damper needing
> a look at as the pistons may be bouncing up and down and that I should
> take it apart, clean and reassmble with fresh oil. That I will do but I
> have a question about the fuel tank.
>
> Even after 35 years of Austin-Healey ownership I have never been up
> close and personal with the inside of an AH fuel tank. I am wondering if
> there may be a little water in the tank (or perhaps even a foreign body)
> and on going up an incline the water in the tank-well, being heavier
> than petrol, flows to the pick-up causing a small amount to be sucked
> in.
>
> It would be appreciated if you could think about all that for a minute
> or two and give me the wisdom of your experiences?
>
> Hoo Roo
>
> Patrick Quinn
> Sydney, Australia
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