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The length of the ram pipes does not really alter the amount or velocity
of air going in, however it is likely that you have a bit more torque
lower down in the rev. scale. The short pipes are for high revs mainly.
Has to do with pulse frequencies and corresponding optimal revs, compare
it with organ pipes.
There will be a difference in the air resistance between the short ram
pipes with gauze filters and the longer ram pipes with proper air
filters depending on the construction and surface area of the gauze
filters and the size and construction of the "proper" air filters. You
also need sufficient depth of the air filters to allow enough clearance
between the ram pipes and the filter top to let the air flowing in. This
should be at least about 1,5", preferably more.
Kees Oudesluijs
Op 29-12-2015 om 11:31 schreef Simon Lachlan:
>
> Hi again,
>
> I?ve got 3 Weber 45s on my 3000.
>
> I?ve just had the whole issue out and onto the floor....the three
> carbs, inlet manifolds and the entire exhaust system. I was thus able
> to replace the core plugs on that side and ? the real point of the
> exercise ? have the necessary surgery done that permits proper ram
> pipes and decent sized air filters to be fitted.
>
> OK, so the surgery?s done. A very neat job. And everything is back on
> the engine.
>
> I had very short ram pipes on before and silly little gauze/wire
> filters that pushed on over the pipes? trumpet mouths. They?d have
> stopped rabbits getting in but wouldn?t have much use for anything
> else.....
>
> I didn?t touch any of the carbs? settings nor did I mess with any of
> the linkage lengths.
>
> So, she still starts first time but the responses are very different.
> It?s got to be because the amount of air is radically(?) different???
> I don?t want to go back to the rolling road unless I have to.
>
> A couple of questions......
>
> 1)Going from the minimum ram pipe to something around 60mm gives
> faster air and that means more air.....correct?
>
> 2)Is it safe to assume that more air weakens the mixture and that I
> must enrichen it (Give it more fuel)????
>
> 3)Also, in the great scheme of things, the readjustments will all be
> fairly minimal? Just the turn of the screw!! Not likely to necessitate
> swapping around with emulsion tubes etcetc???
>
> I?ve managed my Webers so far by having them setup properly and
> leaving them alone thereafter. (Until the surgery). I?ve not really
> grasped their intricacies on an intellectual(?) level so far, more on
> a purely mechanical level. I can do the brute force but anything more
> than the ignorance eludes me where Webers are concerned. (All those
> interchangeable bits of brass.....)
>
> Thanks,
>
> Simon
>
>
>
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>
> Geen virus gevonden in dit bericht.
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> Versie: 2016.0.7294 / Virusdatabase: 4489/11277 - datum van uitgifte:
> 12/29/15
>
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<div class="moz-cite-prefix">The length of the ram pipes does not
really alter the amount or velocity of air going in, however it is
likely that you have a bit more torque lower down in the rev.
scale. The short pipes are for high revs mainly. Has to do with
pulse frequencies and corresponding optimal revs, compare it with
organ pipes.<br>
There will be a difference in the air resistance between the short
ram pipes with gauze filters and the longer ram pipes with proper
air filters depending on the construction and surface area of the
gauze filters and the size and construction of the "proper" air
filters. You also need sufficient depth of the air filters to
allow enough clearance between the ram pipes and the filter top to
let the air flowing in. This should be at least about 1,5",
preferably more.<br>
Kees Oudesluijs<br>
<br>
<br>
<br>
Op 29-12-2015 om 11:31 schreef Simon Lachlan:<br>
</div>
<blockquote
cite="mid:007401d14224$215094c0$63f1be40$@lachlan@homecall.co.uk"
type="cite">
<meta http-equiv="Context-Type" content="text/html;
charset=us-ascii">
<meta name="Generator" content="Microsoft Word 12 (filtered
medium)">
<div class="WordSection1">
<p class="MsoNormal">Hi again,</p>
<p class="MsoNormal">I?ve got 3 Weber 45s on my 3000.</p>
<p class="MsoNormal">I?ve just had the whole issue out and onto
the floor....the three carbs, inlet manifolds and the entire
exhaust system. I was thus able to replace the core plugs on
that side and ? the real point of the exercise ? have the
necessary surgery done that permits proper ram pipes and
decent sized air filters to be fitted. </p>
<p class="MsoNormal">OK, so the surgery?s done. A very neat job.
And everything is back on the engine.</p>
<p class="MsoNormal">I had very short ram pipes on before and
silly little gauze/wire filters that pushed on over the pipes?
trumpet mouths. They?d have stopped rabbits getting in but
wouldn?t have much use for anything else.....</p>
<p class="MsoNormal">I didn?t touch any of the carbs? settings
nor did I mess with any of the linkage lengths.</p>
<p class="MsoNormal">So, she still starts first time but the
responses are very different. It?s got to be because the
amount of air is radically(?) different??? I don?t want to go
back to the rolling road unless I have to.</p>
<p class="MsoNormal">A couple of questions......</p>
<p class="MsoListParagraph"><span>1)<span> </span></span>Going
from the minimum ram pipe to something around 60mm gives
faster air and that means more air.....correct?</p>
<p class="MsoListParagraph"><span>2)<span> </span></span>Is
it safe to assume that more air weakens the mixture and that I
must enrichen it (Give it more fuel)????</p>
<p class="MsoListParagraph"><span>3)<span> </span></span>Also,
in the great scheme of things, the readjustments will all be
fairly minimal? Just the turn of the screw!! Not likely to
necessitate swapping around with emulsion tubes etcetc???</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I?ve managed my Webers so far by having
them setup properly and leaving them alone thereafter. (Until
the surgery). I?ve not really grasped their intricacies on an
intellectual(?) level so far, more on a purely mechanical
level. I can do the brute force but anything more than the
ignorance eludes me where Webers are concerned. (All those
interchangeable bits of brass.....)</p>
<p class="MsoNormal">Thanks,</p>
<p class="MsoNormal">Simon</p>
</div>
<br>
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<p class="">Geen virus gevonden in dit bericht.<br>
Gecontroleerd door AVG - <a moz-do-not-send="true"
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