Hi Geoff,
If I can find David Anton of APT's long advice on DCOE calibration I will
forward it later. But for now ....
The first thing you need to do is to decide exactly what the problem is. If
it doesn't do much when you mash the pedal but will run ok at high rpm have a
look to see what acceleration pump jets you have fitted (these are at each
side of the carb) a 50 is usually ok, maybe a 45.
The idle jet sizes make more difference than the screw which I have only ever
used to set the idle (the idle jets effect more than idle).
What colour are the plugs? Do some plug cuts below 3,000 rpm and some at
4000rpm and so on.
125 mains are small but might be what the engine needs (though I doubt it).
Is the rest of the engine modified? K&N? Ram pipes/trumpets/velocity stacks?
I would stay with 34mm main venturis - you can fit smaller but then again you
could fit SUs! I think that any half decent 1275 should run 36mms and bigger
is better if you can get them to work (40s work very well on my car but I
started off with 34s).
Daniel1312
In a message dated 18/5/1999 2:20:51PM, branch@valinet.com writes:
<< Hello All: With the recent spate of conversations on Weber side suckers,
I'd thought I'd ask if anyone can help with my problem. Have Weber 45 DCOE
on 1275 engine in '74 Midget. It has an awful lack of power, but not a
misfire, more like the exhaust goes "fluffy", at about 3,000 RPM when you
really mash on the pedal. If you gradually add power instead of mashing, it
is fine. I went to a 45F9 idle jet from a 50 F9, thinking it was too rich
because the idle jet screws were all the way in. With the 45 F9 the idle
screws are now out about 1 full turn, but it still does the same thing.
Should I now go even leaner on the idles? Leaner on the Mains? Richer on
the Mains? It looks like it can very expensive to experiment on Weber when
you spend $9.00 on two jets just to try them. Or should I try smaller
venturis? They're really expensive!! Currently running Main 34, Aux 35,
Main Jets 125F2, Idle Jets 45F9. Daniel are you out there?? Thanks for any
help.
Geoff Branch '74 Midget "Yellow Peril"
>>
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