Re: 16v vs. 8v

["Brandon Rife" <brandon@redrose.net>]

Or you could just drop a VR6 into blow the 8v or 16v away, which ever the
case my be. 

----------
| From: Brandon Sommerville <brandon@caseware.com>
| To: scirocco-l@privateI.com
| Subject: Re: 16v vs. 8v
| Date: Friday, November 08, 1996 6:59 PM
| 
| >No, your way off. The valves are not effected. The valves open and close
the
| >same as before. Both intake valves will open and close. This function is
not
| >effected by the 4 butterfly valves were gonna add.  (One per cylinder.)
| >
| >This will be MY last attempt to explain this system. Its quite simple,
| >really. I think your knowlege of 16V mechanics is lacking and this is
why
| >your having difficulty in understanding. Dont take that as a personal
slam,
| >I want you to understand whats going on or I wouldnt have explained it
in 4
| >different ways already. 
| 
| Hey, don't worry.  As I said before I am mechanically challenged!  :)
| 
| Im just running out of descriptions is all. 
| >8V engines have 4 intake and 4 exhaust valves. This is a 4 cylinder
engine
| >with each cylinder getting 2 valves per cylinder. of these 2 valves, 1
valve
| >is for the intake and the other is the exhaust.
| >
| >16V engines have 8 intake valves and 8 exhaust valves. This is a 4
cylinder
| >engine with each cylinder getting 4 valves per cylinder. of these 4
valves,
| >2 are intake and 2 are exhaust. 
| 
| That part I knew and understood.
| 
| >The problem:
| >16V engines have poor low end performance. They dont flow air well
enough on
| >low rpm's due to the design of having 2 intake valves per cylinder. They
do
| >flow alot better on higher rpm's due to the 2 valves. Its performance
| >advantage is on the high rpms. Its lacking performance disadvantage is
on
| >low rpms. 
| >
| >The solution: (We think)
| >Change the low rpm airflow to each cylinder.
| >
| >How we do this is by adding to the intake manifold a set of butterfly
valves
| >(Like what you see inside a carbuertor or throttle body. It opens and
closes
| >ect.) We place one butterfly valve on one cylinder. its job is to close
off
| >the airflow to one of the 2 valves. The other valve will not be effected
by
| >it and will flow air as it has before. As rpm's increase, the valves
will
| >slowly open with the increase of engine rpm's until it's fully open and
the
| >full benefit of having a 16v are used.
| 
| But isn't this reducing airflow at lower rpms?  Or is that how the power
is
| gained?  My assumption was that the 2 intake valves on the 16v were each
a
| little smaller than the 8v valve.  Is that where my mistake is?
| 
| >So essentially, you will have an 8V engine intake system for low RPM's
to
| >have the low end torque. Then once yuove gotten the engine up to where
the
| >16V motor's advantage comes into play, you have it. It would be th best
of
| >both 8V & 16V worlds.
| >I hope that got it.
| >
| >
| >>If this isn't it I'm gonna quietly shake my head, go out back and shoot
| >>myself.  ;)
| >
| >
| >Hopefully I saved a life today! 
| 
| I'm barely holding on.  But I won't get your answer till Monday.  :(
| 
| >Is anybody else having problems understanding? Or am I just an idiot? 
| >DONT ANSWER THAT!!  :)-
| >
| >
| >Shawn
| >
| 
| Brandon Sommerville
| 
| "And then I says, tell me I'm wrong! And she says, I can't baby, 'cause
| you're not!" 
|  - The Evil Midnight Bomber What Bombs at Midnight
| 
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