[Shotimes] Interesting...porting the intake

[Bruce Malachuk]

Well,

I had the dremel and the flexishaft attachment for a while, I picked up a
foot pedal for $12 off ebay so that I could control the speed a little
better. I also got a kit from www.eastwoodco.com that has all the different
rolls and tapers i needed, and i picked up a 2in long 1/8in shank mandrel. I
think I'm gonna be gettiing a 4in and 6in long mandrel in a 1/4in shank and
having my machine shop cut it down so I can use it in my dremel.

I really think that with the mismatch cleaned up on eht long runners, and
some matching on the heads to the runners, some decent numbers could be
gained. I also was working on some measurements on the short runners, and I
think that there is potential there especially with the BBB's teamed up with
a set of custom intake horns. I think the horn design could be made to match
the BBB size and still give the desired venturi effect of speeding the air
up on it's way into the engine. perhaps the effect could be even enhanced.
>From what I have measured it should be possible to machine a set of horns
that would match the BBB size and retail the effective runner length and
venturi effect. But alas with everything it'll be a while till I get some
time to have a set made up.

Seeing what I see here, I have to imagine that there are some sizeable gains
to be had.

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

----- Original Message ----- 
From: "Steve Tatro" <stevetatro_shotimes@att.net>
To: "'Bruce Malachuk'" <bmalach1@nycap.rr.com>; "'SHOtimes'"
<shotimes@autox.team.net>
Sent: Tuesday, August 05, 2003 4:40 PM
Subject: RE: [Shotimes] Interesting...porting the intake


> You may have just found the secret solution to the 300-hp "stock"
> Yamahammer!
>
> I knew those old stories weren't just...well...stories!!!
>
> Let us know how it turns out.  If there's only a few HP to be gained, it
> may not be worth the trouble.  If you're right and there is noticeable
> low-end increase, we may all be buying new Dremels very soon.
>
> Steve "I don't yet own a Dremel" Tatro
> Red/Black '93 with 169k miles
> Cincinnati, Ohio
>
>
>
> -----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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