The spiral or helix throttle body spacers are intended to shed vortices
(little tornadoes) into the intake manifold, the angular velocity
effectively (or not) reducing the thickness of the boundary layer,
theoretically making your manifold's plenum look a bit bigger and freer
flowing...(the boundary layer is the layer of slow moving air that
transitions from the 0 velocity air at the manifold's wall to the central
core of developed flow at max velocity) Its usually a transient effect that
works at specific mass flows... The vortex shedding can look more like a
restriction at higher than optimum flow rates. They may work on some
vehicles, but I'm pretty sure they don't on the Magnum V6 and V8s. Possibly
the 4 banger might benefit a bit in the mid range due to its small-plenum
manifold...
Bruce
----- Original Message -----
From: <david.clement@verizon.net>
To: <dakota-truck-moderator@bent.twistedbits.net>
Sent: Monday, June 20, 2005 8:37 AM
Subject: RE: DML: RE: Throttle body spacer
>
> By lengthing or shortening the intake tract length you can change the
velocity
> of the air flowing into the engine thus getting a ram air effect. Similar
the
> effect you get with headers on the exhaust side.
>
> Dave Clement
> 99 SLT+ CC 4x4
>
> In article <000001c5739a$d36b0050$7900a8c0@highland>, barnesrv@comcast.net
> ("Rick Barnes") writes:
> >
> >
> > Please explain how it could have a "tuning effect that will improve air
> > flow"...just curious how a spacer could "tune" anything.
> >
> > Rascal
> >
> > -----Original Message-----
> > From: owner-dakota-truck@bent.twistedbits.net
> > [mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of
> > david.clement@verizon.net
> > Sent: Friday, June 17, 2005 7:28 PM
> > To: dakota-truck-moderator@bent.twistedbits.net
> > Subject: Re: DML: RE: Throttle body spacer
> >
> >
> > The TB spacers don't help on the magnum 3.9/5.2/5.9 because of the large
> > plenum
> > intake manifold. To have an impact on the air flow into the engine you
need
> > to
> > modify the runners inside the manifold.
> >
> > I do not know what the manifold looks like on your 4 cyl TJ but if it
does
> > not
> > have a large plenum down stream of the throttle body but it could have a
> > tuning
> > effect that will improve the air flow and give you a littel power boost.
It
> > also could have the opposite effect and you could loose some power.
> >
> > Dave Clement
> > 99 SLT+ CC 4x4
> >
> > In article <000201c57346$7bf8e020$7900a8c0@highland>,
barnesrv@comcast.net
> > ("Rick Barnes") writes:
> > >
> > >
> > > The spacer will do absolutely nothing for you.
> > >
> > > Rascal
> > >
> > > -----Original Message-----
> > > From: owner-dakota-truck@bent.twistedbits.net
> > > [mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of
> > > dean_ocque@yahoo.com
> > > Sent: Friday, June 17, 2005 9:29 AM
> > > To: dakota-truck-moderator@bent.twistedbits.net
> > > Subject: DML: Throttle body spacer
> > >
> > >
> > > I am assuming an engine is an engine in most cases. I am looking
at
> > > getting
> > > a throttle body spacer for my TJ. I have heard conflicting reports on
> > them.
> > > Some say it screws up the computer, others say it works great and adds
a
> > few
> > > more horse power, and better miles per gallon. The reason I asking is
> > > because
> > > my four banger needs a bit more power on road.
> > >
> > > Dean
> > >
> > >
> > >
> >
> >
>
>
This archive was generated by hypermail 2b29 : Fri Jul 01 2005 - 09:48:06 EDT