Simon
Just to clarify. The chokes are not interchangeable, they are fixed for each
model. It is the ventures inside the chokes that can be changed to suit your
application.
Derek
On 29 Dec 2013, at 22:14, John Rowe <john@jtkarowe.com.au> wrote:
> Simon
> I think you've just about nailed it. I would tend to lean towards the 152G
> if I was silly enough to go again but I would like to know where the
> progression holes were first. If I can work out how to I would send you a
> diagram but suffice to say the 4th hole is about 1/8" closer to the
manifold
> than the cluster of the other 3 so that it is just passed by the butterfly
> as it opens.
> There is a person in Australia who trades as weberperformance.com.au who
> sells genuine Weber parts for very reasonable prices (eg emulsion tubes $20
> verses another importer $70-don't ask how I know).He states that he now
only
> sells the 152G (as well as 9's) because it seems to have overcome all the
> problems.
> Cheers
> John Rowe
> Qld Australia
>
> -----Original Message-----
> From: healeys-bounces@autox.team.net
[mailto:healeys-bounces@autox.team.net]
> On Behalf Of Simon Lachlan
> Sent: Sunday, 29 December 2013 10:44 PM
> To: 'healeys @autox.team.net'
> Subject: Re: [Healeys] 2 weber 45 questions
>
> A huge amount of research, questioning and resultant confusion has yielded
> me a few certainties. And a lot of confusion which I happily share with
you,
> below....
> Forget chokes....they are interchangeable within carbs of the same size as
> are most of the other parts...jets, springs etc.
> The only thing that seems to really put the cat among the pigeons is this
> business of "progression holes". Weber installations seem to tend towards a
> built in flat spot as the accelerator pushes the carb from its choke inlets
> to its main flow. How and where and when this dreaded flat spot occurs is
> dependent on one's type of engine (twin cam?) or one's camshaft &/or
> ignition. People (often apparently with the wrong carbs in the wrong car)
> seem to cure the flatspot by opening up one of the settings - I forget
which
> - and thus overcoming the issue with a flood of petrol. The "progression
> holes", which each allow in a small amount of extra fuel, are exposed and
> come into effect "progressively" (Geddit now?) as the carbs' butterflies
> open. This fuel, allowed in by one, then two, then three etcetc holes,
cures
> the flatspot. Some peoples' triple Webers seem to yield a perfectly
sensible
> mpg whilst others' are pretty horrific. It's my guess that a lot of this
> results from the having to overcome the flatspot area with buckets of fuel.
> So, a 9 will have different holes from a 13. (Bigger, smaller, more or
> less...I'm not sure). You can make all the interchangeable variable parts
> inside the same, but if one of yr carbs has different holes from yr other
> carbs, you're in trouble.
> Vehicle manufacturers got together with Weber and chose the right carbs for
> their vehicles' specs. Some of the newer 45s appear to have been just plain
> wrong in the cars into which they were sold by tuners/the aftermarket.
Weber
> 45 152s when put into Alphas and, I suppose, hot VWs had a massive flatspot
> problem. (A twincam issue here). People drilled in "progression holes"
until
> - surprise - Weber came up with the 45 152G which had the factory's
> progression holes drilled per the amateur tuners' drilling efforts etcetc.
> The "G" apparently stands for "German"!?!
> Enough. I'm still without any Webers but am leaning, no pun intended,
> towards 9s.
> Happy New Year
> Simon
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