[Shotimes] Interesting...porting the intake

[Bruce Malachuk]

Well porting can lose velocity, which in turn can hurt power and what not. I
think that what I'm doing is less able to be called porting and most of a
"removing obstructions" in the airflow. A 1-2mm lip is substantial in the
mismatch of the long runners. and it seems that on all 3 sets of runners
that I have that mismatch is about the same. I'm very hesitant to "port"
anything cause I know that I won't be able to see the results till a little
cam work, but Stage 1 or therof are a ways away for me. I do plan to polish
the top of the combustion chamber on the 3.0 heads I have for my 3.2 buildup
that I'm starting on. I'm not looking to do the typical "increase area" to
get more air into the aengine slowign it down, but more over making there be
as few restrictions to the airflow as possible. I think increasing anything
airflow wise would have significant negatives on our nearly stock engines.
Even cammed I think that anything mor thant EH and gasket matching might
make some sort of velocity sacrifice.

I'd really like to do a set of heads with velocity porting and actually
making the opening to the valves smaller and more directed to increase air
velocity, but being what head gaskets cost, I'll wait till I have discovered
the 300hp N/A SHO engine, wrote a book on it, and sold the rights before
doing that.

Bruce
94 Opal Frost MTX
93 Black ATX - winter beater then parts car :-)

----- Original Message ----- 
From: "Dave Kegel" <d.kegel@comcast.net>
To: "SHOtimes" <shotimes@autox.team.net>
Sent: Tuesday, August 05, 2003 5:11 PM
Subject: Re: [Shotimes] Interesting...porting the intake


> Well, I don't think porting makes much of a difference at all on a fairly
> stock motor.  Lot's of guys have ported their heads and intakes. I don't
> think there was any increase on a dyno. In fact, depending on what you
read
> and/or believe, porting can actually cause you to lose HP.  There's a very
> interesting website somewhere on this phenomenon.
>
> I think some motors are stronger than others due to differences in cam
> timing, not gasket matching.
>
> Dave "Step away from the Dremel" Kegel
>
> ----- Original Message -----
> From: "Don McKinnon (AST)" <dmckinnon@asttechlabs.com>
> To: "Bruce Malachuk" <bmalach1@nycap.rr.com>; "SHOtimes"
> <shotimes@autox.team.net>
> Sent: August 05, 2003 3:43 PM
> Subject: RE: [Shotimes] Interesting...porting the intake
>
>
> > Bruce,
> > A while ago (years ago?) there was talk on this list about why some
> engines
> > are strong and others are not.  My intake seemed to have less mismatch
> > compared to what others were talking about, stock it ran very strong
193TQ
> > and 195 HP.
> >
> > Laminar flow is definitely the best.  I have an article on heads that
> states
> > the power losses of airflow can be up to 3% just based on the rough
> surfaces
> > in the head intake track alone.  Add in the rough intake runners and
> > mismatched alignments that number surely takes off.
> >
> > Time for BBB and EH intake or hand ported intake!
> >
> > Don McKinnon
> > 95 MTX - White/Mocha 92k miles
> > Stage 1 Power Package with Stage 1cams
> > Canyon Carver Road/Race Suspension
> > Quaife & HiRevs Competition Clutch
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