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Blue/yellow dot cam pulleys


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"107" cam was designed to run with 104 MOP green dot pulleys.

Then... the pollution policies have been imposed and 910 engine has been de-tuned by the use of a variety of retard pulleys.

1986-88 USA Emissions Bosch 910, and all...1989-96 SE, S4, S4s GMP4 910.

MOP: Intake 110° (red)retard / Exhaust 100° (blue)(actually 97°)retard / Jack-shaft 104° (green) or 102.5°(yellow)

The above combination led to -6.5° intake cam retardation!

Now, many owners are replacing the "smog" pulleys with correct green dot pulleys.

What is interesting, on most of the cars the auxiliary shaft pulley is green or yellow!

So, if you replace your red intake pulley with the auxilliary shaft green pulley you'll need to buy only one additional green dot pulley and you're all set.

If you have any "left over" blue or yellow dot round tooth pulley, I'd like to buy them from you. Please PM me.


Edited by MrDangerUS
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