Are you referring to the idle mixture screws on top
near the manifold ..... or the throttle stop screws on
the side when you say you have the screws
backed out.?
...the following is taken directly from
http://www.teglerizer.com/dcoe/webertune.htm
Finally, set your idle mixture. Maximize RPM with the
idle mixture screws, then reduce idle speed to 850-1000
(lowest smooth idle speed) with the idle speed adjustment
screw. Tweak the idle mixture screws again at this speed.
Repeat until no further idle speed increase is observed.
Your idle adjustment screws should be 1-1/2 to 2-1/2 turns
out from full lean. If they are far outside this range, your
idle fuel jet is the wrong size. Increase jet size to reduce
the number of turns, decrease jet size to increase the
number of turns out from full lean (all the way clockwise).
Paul Tegler ptegler@cablespeed.com
www.teglerizer.com
----- Original Message -----
From: "T. .R. Dafforn" <td214@cam.ac.uk>
To: "Paul Tegler" <ptegler@cablespeed.com>; "spitfires"
<spitfires@autox.team.net>
Sent: Monday, October 01, 2001 4:25 AM
Subject: Weber DCOEs
> Hi Paul,
> Judging by your website you seem to know something about
Weber DCOE's on
> spitfires..
> I have just put a pair of DCOE40 18 on my 1500 (sports
manifold and twin
> exhaust, otherwise stock)..
> The original jeting for the carbs was for racing spit, and
very
> extreme...
> Even with these the car idled smoothly (800rpm cold) but
backing off the
> throttle screws as far as they went only allowed idle at
1500 when warm
> (not great)
> also had no power at less than 3000 revs.
> I felt none of this was surprising considering the jeting
> So I rejetted as per the triumph tune suggestions for a
mild road mod
> car.
> Quite a difference, wicked acceleration above 2000rpm
(warp drive
> compared to the SUs, and lovely induction noise!),
reaching 4500rpm
> almost too quickly in 3rd gear...
> Only trouble is that is still refuses to idle lower than
1300rpm dispite
> the having the throttle screws turned right out.
> Any ideas?
> I have, of course, forgotten the jet specs today, but I'll
bring them in
> tomorrow
> Cheers
> Tim
>
> --
> Tim Dafforn
> University of Cambridge
> Structural Medicine Unit
> Cambridge Institute for Medical Research
> Hills Rd, Cambridge CB2 2XY.
> UK
> Tel. (01223) 763230
> Fax. (01223) 336827
> http://smokeroom.cimr.cam.ac.uk/
/// spitfires@autox.team.net mailing list
/// or try http://www.team.net/cgi-bin/majorcool
|