1.8L head on 2.0L block

[green536 at hotmail.com (Chris DeLong)]

Ok so then you are saying that increased air velocity due to port size and 
shape DOES NOT flow more air? Hmm, I would think that INCREASED air velocity 
would yeild more flow due to the forced induction characteristics that you 
mentioned below.



Chris DeLong
Fine Tuning
206.367.5503
www.finetuningperformance.com
Seattle, WA USA





>From: "Allyn" <amalventano@sc.rr.com>
>To: "Chris DeLong" <green536@hotmail.com>, 
><jdbubb@ix.netcom.com>,<scirocco-l@scirocco.org>
>Subject: Re: 1.8L head on 2.0L block
>Date: Fri, 27 Jun 2003 14:05:54 -0400
>
> > More airflow=better efficiency=more power.
>
>umm
>depends on runner diameter/taper / rpm
>rpm change = different intake air pulse size/speed, therefore some
>configurations make more power at low rpm, where some others make more 
>power
>at higher rpm.
>just boring the crap out of intake doesnt give you more airflow in all
>situations. narrower intake passages cause faster air velocity while 
>filling
>the cylinder, and that very momentum can actually cause a forced induction
>effect, as it squeezes that much more air in the cylinder just before the
>intake valve closes. this is how some engines can have a volumetric
>efficiency approaching (and possibly exceeding) a value of 1. the narrower
>intake is not perfect though, as it begins to restrict airflow at higher
>rpm.
>
>so... from an intake perspective, a stock 1.8 head is meant to flow most
>efficiently at a higher rpm than a stock 2.0 head is meant to.
>Al
>
>
>
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