Rick and everyone.....
The 'choke' in a DCOE is a replaceable 'tube' that goes
in the throat of the carb and determines the air pressure
drop (velocity) based on the air the engine is trying to inhale.
I believe you are referring to what is called the cold start
circuit on the DCOE. Yes, this is where the choke cable
attaches but it's not a 'choke' per se`.
That lever arm simply allows a bit more fuel to flow when
trying to start the engine. It does nothing to 'up' the rpms at idle
or restrict air flow (same as adding gas)
the DCOE chokes come in a variety of sizes from 26 to 40 mm
for DCOE 40's and up to 45mm for 45's
pics at http://www.teglerizer.com/dcoe/dcoe45_tour.htm
item #22 is the 'choke' (main venturi)
Rick.... do you have a photo of the dcoe in your Spit? send it
along and I'll post it on the pics and spec page
http://www.teglerizer.com/dcoe/dcoepictures.htm
Paul Tegler
ptegler@cablespeed.com
www.teglerizer.com
----- Original Message -----
From: "Rick Gregory" <Rick@ncmg.com>
To: <ptegler@gouldfo.com>; <spitfires@autox.team.net>
Sent: Monday, July 01, 2002 5:17 PM
Subject: RE: EBay find! (DCOE carbs)
> To Paul and all:
>
> Paul - funny you should mention the choke regarding a DCOE. I have a DCOE
45
> in my '74, and it starts hot or cold with no choke at all - in fact using
> the choke causes a quick death to the engine or prevents it from starting.
> Do you think I need to replace it or is there some adjustment that I can
be
> make? I am not too smart on these carbs - all I know is that once I go two
> or three blocks mine runs really well - until then the idle is a bit rough
> and low, but it will still stay running - just better to give it a bit of
> gas to raise the rpm up by a couple hundred to smooth her out until she
> warms up. I'd sure appreciate your opinion as there are no decent British
> mechanics within six hundred miles of here (that I have been able to
find).
> TIA for your help, and to anyone else that might have some insight....
>
> Rick Gregory
> '74 Spitfire 1500
> Great Falls, Montana
>
>
>
> -----Original Message-----
> From: ptegler@gouldfo.com [mailto:ptegler@gouldfo.com]
> Sent: Monday, July 01, 2002 2:40 PM
> To: Bowen, Patrick; spitfires@autox.team.net
> Subject: Re: Ebay find!
>
>
> You won't know until you have it in hand if it's junk or not :-)
> Seriously Patrick, do a couple of quick calculations on bore
> size of a pair of HS4s, HS2s' etc and compare to the 40mm (maximum)
> of the DCOE 40. you'll quickly realize 40mm is 1.57" dia.
> ...near enough dual HS4's. But in practice, something closer
> to 34-36 mm chokes will work better and give you a wider range
> of adjustability.
>
> When people bitch about dcoe performance problems with their
> installation, it's usually they simply tried to use too large a choke.
> Sure a DCOE can give massive WOT, but a little common sense
> of choke sizes and it'll perform as well if not better than any carb.
>
> Some will say the single dcoe manifold starves 1&4 cyls (unequal length
> ports)
> ....horse dung! NO manifold except specifically designed as a 'tuned
port'
> manifold have equal runners to all cylinders especially not on LBC.s
>
> Paul Tegler ptegler@gouldfo.com www.teglerizer.com
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