[Healeys] 2 weber 45 questions

[Simon Lachlan]

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

-----Original Message-----
From: Derek Job [mailto:derek.c.job at gmail.com] 
Sent: 29 December 2013 11:31
To: Dave Murphy
Cc: Simon Lachlan; healeys @autox.team.net
Subject: Re: [Healeys] 2 weber 45 questions

Richard, 

That is pretty much it in a nutshell.

My 45DCOE 9s came with a 'standard' package of jets and tubes that are
considered reasonable for Healeys and probably jags as well. Only one item
needed to be changed after set up on the rolling road, that was the idle
Jet. I have not yet found a source that lists all of the Weber categories
and sub categories of the models that were and are available. Nobody seems
to be able to properly explain the numbering systems. The only real 'known'
is the pre-fix number which is the choke size.

I suspect that you could probably fit any 45 DCOE to a Healey, but you would
most likely have to change a lot of the jets and tubes depending on exactly
which model 45DCOE you have acquired.

Derek
On 29 Dec 2013, at 05:50, Dave Murphy <roadwarriordave at hotmail.com> wrote:

> Just curious as may be many others as to what all the numbers mean on 
> a Weber DCOE carburetor. I thought I understood them a little, but now 
> I'm really confused!
> I thought 45 was the throat diameter in millimeters, but are we to 
> understand that the choke is really 36 mm? Then what is 45? And to 
> what does the 16 or 13 refer?
> -Dave Murphy, Dearborn MI, '66 BJ8
> 
>> Is there or was there ever a Weber 45 dcoe 16? "16"....not 13? I have 
>> a fellow on eBay who said that he had a pair of 45DCOE "15"s. I 
>> contacted
> him;
>> he came back and said "oops I meant "13"s". Now he's emailed me and 
>> said he has one "13" and one "16". Maybe there was a 40 DCOE 16 and 
>> he's got the wrong top cover.....
> 
>> I'm going to meet a guy tomorrow to look at some Weber stuff. We're 
>> talking DCOE 45s here....are all 36mm chokes the same? Yes, they may 
>> all be 36mm, but, if I buy 3 chokes out of his bits and bobs drawer, 
>> will I find it a battle to find more identical 36mm chokes?
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