Port matching

[jdbubb at ix.netcom.com (Dan Bubb)]

I had been warned that porting the exhaust manifold would be difficult, but was very suprised that
with a die grinder and carbide burr material removal was very quick and it seemed easier to control
the placement of the burr than when cutting aluminum.
I was using a burr similar to pn 43035a54 at www.mcmaster.com

For aluminum I would use PN 4295a32. It's got bigger more open teeth and doesn't clog so easily.
BTW, WD-40 on the burr helps prevent clogging.




Sent: Thursday, September 23, 2004 10:15 AM
Subject: Re: Re: Port matching


>
> >
> > From: Mark <mardak@cogeco.ca>
> > Date: 2004/09/22 Wed PM 11:39:27 EDT
> > To: Scourge <scourge@cogeco.ca>
> > CC: Rocco list <scirocco-l@scirocco.org>
> > Subject: Re: Port matching
>
>  When you
> > line the gasket up, everything has a bit of play in it, so what I did
> > was removed a bit more on the intake ports of the head, and also the
> > exhaust manifold holes.  Some people actually recommend bigger exhaust
> > manifold holes to create a "reversion dam"...  There is debate about
> > whether or not it's a good idea, but with this less than perfect method
> > of determining how much metal to remove you're better off with a step
> > that opens up with the airflow instead jutting out into the airflow...
> > When you have removed the metal to the scribed lines "blend" it in to
> > the ports over about one to two inches.
>
> Mark,
>   When I tried to match-port my exhaust mani., I found it way too hard to grind that down without
taking tons of time...  I was using a pneumatic die grinder...  What did you do that I did not?  Was
your mani new?
>
> Just curious,
>   David
>
>
> ---Chrome don't get you home.---
>
>
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