RE: engine decision's... I have made up my mind.

["Neal Tovsen" <sixteen.volt@verizon.net>]

What's wrong with a top end? (What IS a top end?) Why will I get burnt
valves?

I'm getting the feeling here that we're all either too lazy to explain, or
none of us actually knows the answer to the backpressure question...

Neal

> -----Original Message-----
> From: owner-scirocco-l@scirocco.org
> [mailto:owner-scirocco-l@scirocco.org]On Behalf Of Brian Wagner
> Sent: Monday, August 06, 2001 4:44 PM
> To: sfwilliams@home.com; Josh.Hignight@phoenix.edu
> Cc: scirocco-l@scirocco.org
> Subject: RE: engine decision's... I have made up my mind.
>
>
> BP is essential to the life of the engine, without it you will get burnt
> valves and a top end.
>
> Brian
>
> 88 16v
> 87 16v
> 86 8v (sold to neighbor)
>
>
>
> >From: "Scott F. Williams" <sfwilliams@home.com>
> >To: "Josh Hignight" <Josh.Hignight@phoenix.edu>
> >CC: "scirocco List" <scirocco-l@scirocco.org>
> >Subject: RE: engine decision's... I have made up my mind.
> >Date: Mon, 6 Aug 2001 16:27:15 -0400
> >
> >Okay, you got me there. Let's say that no *4-stroke* motor needs
> >backpressure. :^)
> >______________________________
> >Scott F. Williams
> >Account Manager
> >GENUiTY - Eastern Region
> >100 Wall Street, 10th Floor
> >New York, NY 10005
> >Voice: 212.416.1745
> >Cell: 917.648.2256
> >Fax: 212.618.5160
> >scott.williams@genuity.com
> >
> > > -----Original Message-----
> > > From: owner-scirocco-l@scirocco.org
> > > [mailto:owner-scirocco-l@scirocco.org]On Behalf Of Josh Hignight
> > > Sent: Monday, August 06, 2001 4:15 PM
> > > Cc: scirocco List
> > > Subject: RE: engine decision's... I have made up my mind.
> > >
> > >
> > > Umm, 2-strokes benefit from backpressure. Since most 2-stroke
> > > engines don't
> > > have mechanical valves, the back pressure helps to eliminate blow-by,
> >thus
> > > increasing power because it maintains that there is a mixture to
> > > burn in the
> > > chamber (Hence the reason my r/c car barely runs when the pipe
> > > falls off).
> > >
> > > But that's beside the point when it comes to dubs. Just thought
> > > I'd mention
> > > it.
> > >
> > > Joshua Hignight
> > > Student Services/Technical Services
> > > New Mexico Campus
> > > (505) 821-4800
> > >
> > >  -----Original Message-----
> > > From: 	Scott F. Williams [mailto:sfwilliams@home.com]
> > > Sent:	Monday, August 06, 2001 1:11 PM
> > > To:	jdbubb@ix.netcom.com; Neal Tovsen
> > > Cc:	scirocco List
> > > Subject:	RE: engine decision's... I have made up my mind.
> > >
> > > Let's kill the myth that backpressure helps an engine. NO ENGINE
> >BENEFITS
> > > FROM RESTRICTION IN THE EXHAUST SYSTEM! The reason normally aspirated
> > > engines may gain more torqe with a smaller diameter exhast,
> is because
> >the
> > > higher velocity in the system creates a greater scavenging
> effect that
> >in
> > > turn allows for cleaner combustion chambers, wich means more air-fuel
> > > mixture per stroke, which means more power.
> > >
> > > Zero backpressure is always the ideal. Complete scavenging and
> > > high exhaust
> > > velocity are always the goal.
> > > ______________________________
> > > Scott F. Williams
> > > Account Manager
> > > GENUiTY - Eastern Region
> > > 100 Wall Street, 10th Floor
> > > New York, NY 10005
> > > Voice: 212.416.1745
> > > Cell: 917.648.2256
> > > Fax: 212.618.5160
> > > scott.williams@genuity.com
> > >
> > > > -----Original Message-----
> > > > From: owner-scirocco-l@scirocco.org
> > > > [mailto:owner-scirocco-l@scirocco.org]On Behalf Of Dan Bubb
> > > > Sent: Monday, August 06, 2001 2:55 PM
> > > > To: Neal Tovsen
> > > > Cc: Patrick Bureau; scirocco List
> > > > Subject: Re: engine decision's... I have made up my mind.
> > > >
> > > >
> > > > somebody, please somebody explain this BS about lower backpressure
> > > > causing loss of power!
> > > >
> > > > Neal Tovsen wrote:
> > > > >
> > > > > > 2.5" Pipping finishined with stainless Remus or Borla
> Muffler.(to
> >be
> > > > > > decided)
> > > > >
> > > > > Did you mean 2.25"? 2.5" is pretty damn HUGE for a N/A 2.0L
> > > engine. With
> > > > > such a loss of backpressure, you might actually lose power.
> > > Since you're
> > > > > ordering the manifold/downpipe from TT, you could go with their
> >2.25"
> > > > > exhaust system with a Borla for a sweet full setup.
> > > > >
> > > > > Looks like a screamin' setup otherwise. Go for it!
> > > > >
> > > > > Neal
> > > > >
> > > > > --
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