I saved this post by Todd at Air & Water from a couple years ago:
"The 16V exhaust cam does have the duration and lift to produce quite a jump
in
horsepower at the expense of some torque, when modified into an intake cam.
Mojor downside is idle. On CIS-E cars it's almost impossible to get it to
idle, without cranking the bypass screw wide open (to over 1500 rpms), and
even then it is very rough. The idle can be smoothed out a tad with a custom
chip in the Motronic 16Vs, but is still quite lumpy.
To convert over an exhaust cam to intake specs, cut off the cam gear snout
and
approximate a timing mark 180 degrees off on the chain sprocket. Actual
timing will still be about 6 degrees off, which you cannot compensate for.
An
adjustable sprocket will only change the intake/exhaust index to the crank,
not to each other.
I recommend springing for the Neuspeed cam for a couple reasons: no one has
the Euro 16V intake cam available stateside, and the Neuspeed profile
actually
produces a better powerband. The shorter duration (250 vs 252) and lower
lift
(.378 vs .380) seems to retain all of the stock torque curve, while adding
some noticable hp above 5k rpms. I'm not sure if NS profiles the cam this
way
for emissions or power reasons, but it definitely has a stronger low end vs
the Euro version."
HTH,
GBergthold
From: "Mark Reda" <[email protected]>
To: "a2list" <[email protected]>, "VWoT" <[email protected]>
Subject: [a2-16v-list] 16V Exhaust Cam as Intake Cam
Date: Wed, 3 Sep 2003 22:35:18 -0400
I remember hearing about this a while back.
Now I have a spare head and am considering the mod.
Does anyone have any information regarding modding a stock 16V Exhaust Cam
as an intake cam?
The exhaust cam is suppose to be a little more radical than a Euro Intake
Cam and not affect emissions.
Mark Reda.
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