Re: 16v vs. 8v: Fact vs. Myth

[jdoc@postoffice.ptd.net]

> Date:          Fri, 08 Nov 1996 19:11:11 +0500
> To:            scirocco-l@privateI.com
> From:          Dan Ruddick <druddick@vt.edu>
> Subject:       16v vs. 8v:  Fact vs. Myth
> Reply-to:      scirocco-l@privateI.com

>         The 8V 1.8L develops the same amount of torque and horse power as
> the 16V 1.8L at the bottom end of the rpm band.  Look at a horsepower curve
> for the two engines, European car has said it a million times.  The 16V only
> feels weak compared to the 8V because of the peakiness of it's power.

>  The myth of the greater low end power of the 8V is not true!
Can I quote you on this?

>  If you want to
> beat an 8V off the line rev the engine up and drop the clutch!(not
> recommended for younger viewers)  Anyway, the 8V cars weigh less, so at low
> rpm where the power is the same, the 8V should go faster.
> 
>         However, the 8V may respond better at low rpm since the intake and
> exhaust gas velocity is higher with the 8V at a given rpm.(same volume of
> gas moves in and out of an 8V and a 16V 1.8L at a given rpm, just less area
> for it to move throughin the 8V, hence higher velocity)  The higher velocity
> of the moving gas in the 8V will give you better throttle response, and
> better air/fuel mixing, etc...
> 
>         The advantage of the 16V comes when you reach higher rpm and the
> greater valve area allows you to flow more.  shawn's point was to close off
> four intake vales at low rpm to increase the gas velocity through those
> valves and increase the way the engine feels and (apparently) performs.
> I've run my lightly modified 8V against Chris Taylor's lightly modified 16V
> and to be honest, he kick's my ass.  Perhaps not tomorrow though, when I
> install that new head..... 
> ~~~~~~~~~~~~~~~~~
> Dan Ruddick
> Virginia Tech
> '87 Scirocco 8V
> "Yeah, but what are ya gonna do?"  -Homer Simpson, philosopher
> ~~~~~~~~~~~~~~~~~
> 
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