[Shotimes] Interesting...porting the intake

[Bruce Malachuk]

The best part is that I have 3 intakes here. I plan for a full workup on one
minus BBB's, just gasketmatching on the long runners on another, and then a
stock one. I figure that there is a dynoday comming up in about a month in
MA, so I'll find someone to be a ginuea pig and try the different intakes.
For my own car I will also finish the intake to head gasketmatching that
Kurt Metros and I talked about back in Feb. of this year. I have these
different rolls from the grinding kit and they make very very fast work of
the soft aluminum.

If anyone has some old used intake runner gaskets out there that they were
able to remove from thier intake without breaking them all up, I'd love to
get some. I think for these "testing" intakes using an old gasket with some
RTV to seal them up decent would be ok. I get RTV for free but intake gasket
kits are $35 plus shipping. I'll pay shipping to anyone that has an old used
set laying around.

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

----- Original Message ----- 
From: "Ron Porter" <ronporter@prodigy.net>
To: "'Bruce Malachuk'" <bmalach1@nycap.rr.com>; "'SHOtimes'"
<shotimes@autox.team.net>
Sent: Tuesday, August 05, 2003 5:09 PM
Subject: RE: [Shotimes] Interesting...porting the intake


If you have the chance, you should try a "before and after" Dynojet test.

Ron Porter

-----Original Message-----
From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
On Behalf Of Bruce Malachuk
Sent: Tuesday, August 05, 2003 4:27 PM
To: SHOtimes
Subject: [Shotimes] Interesting...porting the intake


Well over the past few days I decided to put my dremel to the test and port
a
portion of my intake. Mainly enlarging the TB area for a 69mm TB, which I
got
for $40 and it turns out to be an 89 TB so it has a much lighter return
spring
than the 94 one that was on my car. So I ground out the opening and smoothed
it's transition, making sure to leave a slightly rough surface. Then I
decided
to look at the openings of the runners with my new felpro set. Well we all
know that there are gains to be had from gasket matching and whatnot, but
something I found that was not expected.

The mating surfaces of the tanks to the long runners are in particular very
very mismatched. If you take a dental mirror and look thru the front tank
when
the long runners attached you'll see a 1-2mm lip that is quite mismatched. I
have yet to finish, but I think this mismatch might be considerably more
important to the low end of the engine than even gasket matching the runner
to
head interface. I'm just guessing here but I'm thinking that the lip is
causing a 5% or so blockage to the long runners, and with that creating a
ton
of turbulence to the low end. I'm planning on gasket matching an intake
entirely other than the runner to head mating surface, and then leaving one
stock and trying to take them to a dyno day and swapping them. I think the
mating surface to the tanks on the long runners has a ton of potential
waiting
to be unleashed.

Wanted to see what others had come up with or seen.

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