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What about the port? was: Do these things work?
Ah I see your point.. well its purchased now.. well see...
thanks for the info anyways...
btw: the gasket on the intake manifold does nothing to inibate heat from
head to manifold..
Patrick
=>-----Original Message-----
=>From: scirocco-l-admin@scirocco.org
=>[mailto:scirocco-l-admin@scirocco.org]On Behalf Of Dan Bubb
=>Sent: Saturday, March 02, 2002 7:21 PM
=>To: Allyn; Larry; Scirocco-l@scirocco.org; flaatr@yahoo.com
=>Subject: Re: What about the port? was: Do these things work?
=>
=>
=>Yes! Air going in a straight line is what you want. The problem is the
=>straight line of the spacer is not inline with the straight line of the
=>manifold and head port.
=>The point is that adding this spacer that clearly has the port milled
=>perpendicular to the face puts kinks in the flow.
=>The port in the manifold is inclined up 21 deg (dug out my paperwork and
=>found the actual number) from the head-to-block surface of the head. The
=>port in the head (at the manifold interface) is also inclined up at 21deg.
=>The centerline of the port in the spacer is parallel to the head
=>surface. 21
=>deg difference.
=>So, the air comes down the manifold port at 21 deg does a quick
=>jog to 0 deg
=>goes 3/8" then does another quick jog of 21 deg. This is not a straight
=>line.
=>Now to answer the next question. Can I just port the spacer to 21 deg??
=>No! Because the centerline of the manifold port and the head port will be
=>offset by 1/8". ~.375 X tan21. In this case there will be big
=>discontinueties in the port wall disrupting airflow even more. Try to
=>visualize a side view of the port.
=>Well, hell! While we're paying way to much attention to this POS.
=>The whole
=>idea of this spacer is to insulate the intake manifold from the
=>head so the
=>manifold is cooler and doesn't heat up the intake air. But, where is the
=>intake manifold picking up its heat from? If it's picking it up from the
=>head (bearing in mind that there is already an insulator/gasket
=>between the
=>head and the manifold!) then insulating it would be a good idea. But, what
=>if it's picking up most of it's heat from the adjacent exhaust
=>manifold? If
=>that's the case then this spacer won't do jack Personally, I think the
=>proximity to the exhaust manifold it the most likely source of intake
=>manifold heat.
=>I don't think I've told anyone on this list not to try something, but the
=>engineer in me says this is just a waste of time.
=>If you do before and after dyno runs, make sure engine and
=>ambient air temps
=>are comparable and that the underhood environment is comparable
=>i.e that the
=>effects of any potential intake manifold heating are the same.
=>Best of luck.
=>Dan
=>
=>----- Original Message -----
=>From: Allyn <amalventano1@comcast.net>
=>To: Larry <rocco16v@netzero.com>; Dan Bubb <jdbubb@ix.netcom.com>;
=><Scirocco-l@scirocco.org>; <flaatr@yahoo.com>
=>Sent: Saturday, March 02, 2002 1:00 PM
=>Subject: Re: What about the port? was: Do these things work?
=>
=>
=>> How is air going in a straight line a 'hiccup'? air wants to go in a
=>straight line... the more
=>> straight line the better.
=>> Al
=>>
=>> ----- Original Message -----
=>> From: "Larry" <rocco16v@netzero.com>
=>> To: "Dan Bubb" <jdbubb@ix.netcom.com>; <Scirocco-l@scirocco.org>;
=><flaatr@yahoo.com>
=>> Sent: Saturday, March 02, 2002 8:19 AM
=>> Subject: Re: What about the port? was: Do these things work?
=>>
=>>
=>> > Good point, Dan.
=>> > If the angle is not "built-into" the spacer, this little
=>hiccup in flow
=>may
=>> > offset any gains from reduced heat.
=>> > No free lunch, eh?
=>> >
=>> > Larry sandiego16V
=>> >
=>> > > Aside from the potential reduction in heat has anybody thought about
=>the
=>> > > port shape?
=>> > > The port exits from the head at ~23deg from perpendicular.
=>So, putting
=>in
=>> > > this spacer gives you a short section perpendicular to the head and
=>> > offsets
=>> > > the axis of the manifold port from the head port by about 1/8".
=>> > > Significant?? I'd think it's a bigger factor than loosing a little
=>heat.
=>> > > Dan
=>> > >
=>> > > ----- Original Message -----
=>> > > From: Euroroc II <flaatr@yahoo.com>
=>> > > To: <Scirocco-l@scirocco.org>; <flaatr@yahoo.com>
=>> > > Sent: Friday, March 01, 2002 4:54 PM
=>> > > Subject: Do these things work?
=>> > >
=>> > >
=>> > > > Seems like a good idea and it makes sense like it should work but
=>does
=>> > it?
=>> > > >
=>> > > >
=>> > >
=>> >
=>http://cgi.ebay.com/ebaymotors/aw-cgi/ebayISAPI.dll?ViewItem&item=
=>1809256474
=>> > > &r=0&t=0
=>> > > >
=>> > > > -Raffi
=>> > > > '84 Scirocco gone to a better place
=>> > > > '87 Scirocco 16V from Hell
=>> > > >
=>> > > >
=>> > > >
=>> > > > _________________________________________________________
=>> > > > Do You Yahoo!?
=>> > > > Get your free @yahoo.com address at http://mail.yahoo.com
=>> > > >
=>> > > >
=>> > > > _______________________________________________
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=>> > >
=>> > >
=>> > >
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=>> > >
=>> >
=>> > ----------------------------------------------------
=>> > Sign Up for NetZero Platinum Today
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