Hi Derek,
Maybe it's a naming convention issue, but 45DCOE can have 28mm to 40mm
"chokes" or "main Venturi" See here
http://www.weberperformance.com.au/product_info.php?cPath=6_13&products_id=19
&osCsid=2pvi844ntjkpthi41u1puarho7
Best
Chris
Sent from my iPhone
> On 30 Dec 2013, at 8:34 pm, Derek Job <derek.c.job@gmail.com> wrote:
>
> 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' spec
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