RE: Tires (50mm intakes)

["Aaron Ness" <aaron@makuta.com>]

Actually, lots of engines have been made with multiple-stage intakes.  It's
a very simple concept, but there's a lot of sophistication to it.  It's
basically a "tuned intake" that is tuned for several different RPMs.  If you
wanted to do it on your own, without all the resources of a manufacturer,
you could look at the torque curve for your engine.  Find the peak, look at
the RPM, and follow a fairly simple formula to calculate the optimum length
for your intake.  Then look at a fluid mechanics book to see how the bends
in the system affect the effective length, and build something.  Now re-run
your engine on the dyno and look at your torque curve.  The peak should
occur around the same RPM, but if you did everything right, it's now higher.

I believe F*&d was using a 3-stage intake on their Triton V8s in their
trucks until a couple of years ago when they switched to a 2-stage intake.
In those cases, I assume you are tuning for two (or three) torque peaks
rather than one.

Aaron
'82 Scirocco
'84 Scirocco
'70 Bug - Hibernating
'87 Jeep Cherokee 4.0


> -----Original Message-----
> From: owner-scirocco-l@scirocco.org
> [mailto:owner-scirocco-l@scirocco.org]On Behalf Of Night Shadow
> Sent: Wednesday, October 04, 2000 9:43 AM
> To: T. Reed
> Cc: Brett Van Sprewenburg; scirocco-l@scirocco.org
> Subject: Re: Tires (50mm intakes)
>
>
>
> Someone has done something very similar, it's called VTEC...yep.....
>
> Eric
>
>
>
> On Tue, 3 Oct 2000, T. Reed wrote:
>
> >
> > > mile or 0-60 run then an equivalent 16v with a 40mm.  Top speed is
> > > likely a different story, but I'm thinking that the greater air
> > > velocity of the 40mm has got it where it counts the
> most...like where
> > > most people actually drive their cars most of the time.
> Don't quote
> >
> > Hmm, looking at the physics behind this, I wonder if
> someone hasn't tried
> > rigging up a mechanical servo that changes the diameter of
> a hole (like
> > those doors in star trek, basically) and then controlled the servo
> > electronically based on RPM. Then you could have the best
> of both worlds
> > ..  intake restriction and high air velocity for better
> atomization at low
> > RPMs, -and- a higher flow rate at higher RPMs. I bet it
> would probably
> > need to be placed between the head and the lower intake for maximum
> > effectiveness, though..
> >
> > Hmm..
> >
> > -Toby
> >
> > --
> > '87 16v
> >
> >
> >
> > --
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> >
>
> Eric
>
> 80 Scirocco (GF's Daily Driver)
> 81 Scirocco S (2.0 16v swap and complete restoration in progress)
> 91 Cabriolet (2.0 8v swap and mechanical rebuild in progress)
> 97 Golf Trek (Parts car)
> 00 Golf GL TDI (My Daily Driver)
>
>
>
> --
> Email problems to: scirocco-l-probs@scirocco.org  To unsubscibe send
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>


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