[Healeys] Fuel pump's psi & 3/8" unf k-nuts.

[Derek Job]

Simon

Regarding space for the rear carb. When you say bodywork do you mean the
diagonal support strut that runs down from the bulkhead to the front of the
car? If so then you need to have it modified. You have to cut out a part of
this strut and replace it with modified support. DWR sell this modified piece
already made. With that out of the way there is plenty of room.

I have not seen any Weber set up that has the vacuum advance connected to it.
Perhaps because fuel economy at low throttle settings is not the objective.

You do not need the balance pipe and you can connect the servo  to the rear
manifold, it should have provision for that. I would not route the crankcase
vent back into the intake manifold as you are just polluting your intake
mixture. I run mine to  a vented catch tank and another one from the valve
cover to the tank.

I would recommend having everything set up on a rolling road. When that is
done correctly you will not need to touch the Webers for a long time.

Derek


On 13 Feb 2014, at 17:25, Simon Lachlan <simon.lachlan at homecall.co.uk> wrote:

> Thank s for this.
> Burlen says my pump pushes out between 2 and 3.8psi. That's per side. Thus,
> in the unlikely event of my keeping it at full throttle for any time, I
> could switch on the other half and increase the flow.
>
> As to filters.......well I've hit the issue regarding space between the
carb
> nearest the passenger and the bodywork. 39mm of space to be precise. One is
> told to leave approx 25mm space in front of the ram pipes in order to
ensure
> clear air flow. That points one towards 16mm ram pipes, but not much by way
> of filtration. What did you do?
>
> Likewise, I've had very contrary advice as to connecting the vacuum pipe
for
> the 123Ignition distributor. The vendor says "do without, but accept high
> mpg". The manufacturer says "fit a pipe connected to at least one of the 3
> separate manifolds". I am going to fabricate a so-called balance pipe
> connecting all 3 manifolds and plumb my vacuum advance, brake servo and PCV
> valve into this pipe. (Much like was fitted by the factory for my MkII
BT7).
> I can't see why connecting the vacuum pipe was "good" for the SUs but "bad"
> for Webbers.
> Also, I wonder why the timing should need adjustment for the Webbers if it
> was good for the SUs???
> Any thoughts on any of those issues?
> Simon
>
>
> -----Original Message-----
> From: Derek Job [mailto:derek.c.job at gmail.com]
> Sent: 13 February 2014 16:41
> To: Simon Lachlan
> Cc: healeys at autox.team.net
> Subject: Re: [Healeys] Fuel pump's psi & 3/8" unf k-nuts.
>
> Simon I have triple Webers on my car. I have a fuel regulator and run at
> 3psi. Sometimes I try it at 3.5 and I can't say I've noticed much
difference
> but 3 is a number that gets thrown around. They don't need high pressure
but
> they do need flow. I had to upgrade my Facet fuel pump to the Red Top
> because when I really floored the throttle the car would die as it wasn't
> get enough fuel. Luckily I discovered that at our pre season track day and
> not during an event.
>
> I had my Webers set up on a rolling road without the air filters. If i
floor
> the throttle with the filters on I get some hesitation nearer the top end.
> Worth taking into consideration when you have them properly set up.
>
> Derek
> On 13 Feb 2014, at 14:39, "Simon Lachlan" <simon.lachlan at homecall.co.uk>
> wrote:
>
>> I have an AZX1500 pump in my MkII BT7. (Double ended SU). This is
>> basically
>> 2 AUF 301 mated together. Although one can run both at once, it's not
>> usually necessary and one might say that one half is a reserve for the
>> other. I have mine independently switched.....either, both or none
>> depending on the switches.
>>
>> So, finally to the point.....
>>
>> I'm in the slow throes of fitting 3 Weber 45 dcoe 9s. I've got them in
>> and running. One of them drips a little fuel which I'd put down to it
>> needing any one of a zillion adjustments. I was speaking to Webcon,
>> here in UK, about something else and I mentioned the drip. The guy
>> said that Webers only require +/- 3psi and that my pump was probably
>> putting out more like 5psi per side. Any ideas?
>>
>>
>>
>> And does anyone know where I can get more of those wretched little
>> 3/8" unf "k-nuts"? I'll be taking my Webers out at some stage and I
>> suspect that these things can only be used once. Or am I wrong?
>>
>>
>>
>> Thanks,
>>
>> Simon.
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