Greg wrote,
>Taa for the weber 42 ideas. The main consideration for them is that I have
1
>already and I can get another, and that I thought 45s would be too big.
I've
>spoken to the weber specialists here in NZ and they assured me that parts
>are all available. But I'll double check this, as I don't want to get
caught
>out. I haven't heard many problems with the 40s though as far as power
goes,
>it's just finding some not too dear in sound condition.
>I've seen two different manifolds here, one has sharpish kink in the middle
>of it and the other is straight. I've checked and both will fit OK. The
>straight one is aftermarket with decent length and diameter tubes, but new
>and dear. Any ideas?
>
>Greg
Jets are available, but chokes are unobtainium.
Changing jets is not always the best way to make the most power.
Particularly with race engines, one will put large chokes, and big jets
to make great upper end power, but at a tremendous expense to the lower
end.
Many find that they can make the car drivable using smallish chokes,
and raceable using largish chokes. Experimentation is in order, but
I have found 32mm is the tops for a street driven setup, and 36mm runs
very lean on the low end in a race setup.
A range of 28 to 34mm would be what should work in a single engine
under all conditions.
Since not many choke varieties were ever produced for the 42s, your options
are at the very least limited, if not outright fixed to what is inside the
carbs that you buy.
Here in the US, there is a Weber distributor that sells brand new weber
40s and 45s as well as most of the tuning parts, their prices are better
new than I have seen for used stuff on ebay.
There are no problems with 40 DCOEs that you will hear of. They are a darn
fine
carburettor when properly setup. You can make over 70bhp per carb without
any
concern for needing larger throtles.
At to your manifolds, most likely the one with a "kink" is a cut and welded
Arrow angled intake, like what Holbay sold for many years. Cut and welded
due to the fact that Arrow engines sat at a slight angle relative to
vertical,
and our engines were dead vertical.
Try not to enlarge the ports or intake runners too much, port velocity is
very important in single throtle per cyl applications.
Good luck,
Jarrid
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