Intake Header

[dswalterwi at gmail.com (Don Walter)]

And you don't think some of that was taken into consideration with the
design of the 16V intake runners?

Don


On Tue, 30 Nov 2004 15:15:35 -0500, GTG <navyseal2b@insightbb.com> wrote:
> You mean like tuning the length of the intake runners?  Because yes, that
> does help, similar to scavenging as you've said.  Do you have some sort of
> design in mind?  If you're interested in making a really good intake system
> without doing any ridiculous physics, look at existing designs.  First
> things that come to mind for me (I'm a Bimmer guy) are the Euro S50 engine,
> S14 (esp the Carbon manis for their race cars), and Dinan Z8 intake systems.
> 
> Some reading material:
> http://www.google.com/search?hl=en&lr=&c2coff=1&q=helmholtz+equation+intake+manifold&btnG=Search
> Vortex also has several threads having to do with the helmholtz principle
> and intake systems.
> I skimmed through the first few links there and they look pretty useful.
> I'm working with wave physics right now in school, and most of the math is
> barely beyond the level of a good college level physics 1 course.  Waves and
> fluid dynamics are responsible for the "scavenging" effect you're looking
> for.  The scavenging comes from waves, though, which only produce the right
> effect at or very near certain frequencies, which is why it will be most
> effective in a narrow RPM band.  Some more modern engines have variable
> length intake runners (along with the variable valves and such) to optimize
> for several different RPMs.
> I've also heard that polishing the inside of intake runners is not a good
> idea because a rough surface actually creates better flow.  I suppose that
> doesn't include the area right up at the valves since polishing is so
> popular there, but that might be something to look into as well.
> 
> -Grant-
> Annapolis, MD/Louisville, KY
> 1980 in storage :(
> 
> 
> 
> 
> ----- Original Message -----
> From: "Kervin Ridgley" <carsandkites@gmail.com>
> To: <scirocco-l@scirocco.org>
> Sent: Tuesday, November 30, 2004 12:04 PM
> Subject: Intake Header
> 
> >I was thinking about ways to get the the intake side to flow better.
> > Would something like a intake header help.  By spacing out the intake
> > sucks (you know, the opposite of exhaust pulses), would it "scavenge"
> > more air in?  Just a crazy idea I was having.
> >
> > Kervin
> >
> > _______________________________________________
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> > Scirocco-l@scirocco.org
> > http://neubayern.net/mailman/listinfo/scirocco-l
> 
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-- 
Don Walter - Waukesha, WI
1986 1.8 16V Black Scirocco
1986 2L 16V Toronado Red Scirocco (under repair)
1988 1.8 16V Toronado Red Scirocco (sold on 3/29/04)
1984 1.8 8V Pewter Scirocco (sold years ago)
1971 Karman Ghia (sold)
1969 Karman Ghia (sold)
1969 Beetle (sold)