Re: thoughts on breathing - long

[Marc scirocco Québec <marc_scirocco@yahoo.ca>]

Thanks for more info, if you have the intake apart,
maybe you want to port match the runners AND to open
them up as well. And of course, do open the throttle
body opening.

Cheers.

Marc

 --- Colin <cwass99@home.com> a écrit : >      First,
I appreciate all the comments I've
> received so far.  I think I need
> to add a little bit of background, though.  First,
> the exhaust is not even
> close to stock.  I replaced the toilet bowl with a
> Pacesetter header feeding
> into 2 1/2" pipe, high-flow cat and DynoMax muffler.
>  It's a bit (OK, a lot ;))
> loud, but I doubt it's providing any significant
> restrictions.  The head was
> recently done including polishing (wasn't port
> matched for various reasons, but
> it's close).  So, the biggest restriction, to my
> mind, is on the intake side, as
> long as we ignore the valves and cam for now.
>      I think the key phrase in the below response is
> "after a point". 
> Eventually, my goal is to have the intake and
> exhaust able to provide more air
> than the intake manifold and head (with a mild cam)
> can use.  Right now,
> however, the intake is easily capable of more flow
> than the air box and
> associated bits will provide.  Also, I can't imagine
> that a simple port matching
> on the intake will make that substantial of a
> difference.  I'm planning to do
> it any way, but I see that as less important than my
> other concerns. 
>      Of course, if I'm wrong I'm sure someone will
> point it out.  
> 
> Cheers,
> Colin
> 
> On 30-Nov-01 Marc scirocco Québec wrote:
> >  --- Marc scirocco Québec <marc_scirocco@yahoo.ca>
> a
> > écrit : > "On the earlier manifolds the runners
> can be
> > the
> >> most
> >> restrictive part of the intake system. (...)
> after a
> >> point you could saw the intake manifold plenum in
> >> two
> >> and the flow would not improve. Provided with
> this
> >> clue. intake manifold porting was born."
> >> 
> >> - from Greg RAVEN's book VW water-cooled
> Performance
> >> Handbook
> >> 
> >> If you do not port the IM, anything done before
> the
> >> runners is useless.
> >> 
> >> Cheers.
> >> 
> >> Marc
> >> '83 Scirocco
> >> '88 Scirocco Slegato
> >> 
> >>  --- Colin <cwass99@home.com> a écrit : > Hi,
> >> >      I've been thinking about how to improve my
> 8v
> >> > breathing and I figured I'd
> >> > better get opinions before I did something
> >> permanent
> >> > and annoying.  There are 2
> >> > basic problems to breathing on my stock CIS
> system
> >> > and they each attach
> >> 
> >> snip snip...
> >> 
> >> >      I appreciate any thoughts or comments
> (except
> >> > on spelling or grammar...;)).
> >> > 
> >> > Cheers,
> >> > Colin
> >> 
> >>
> >
>
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> >>  
> > 
> >
>
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