RE: 16V Cam setup/260 intake cam with stock exhuast?

[Brett Van Sprewenburg <brett@netacc.net>]

>Ok, so typically cams are listed (named/adverstised) by thier lift, i.e a
>Shrick 260 is 260 degrees of lift.

That number is called the duration as measured (usually) at .050in of lift.

The Schrick 260 16v intake cam opens at 16 degrees BTDC, close at
64 degrees ABDC.  The 260 exhaust cam opens at 64 degrees BBDC and
closes 16 degrees ATDC.  Intake lift is .441, exhaust lift is .441.
Overlap is 32 degrees.

> So I guess my concern would be overlap,
>which to my knowledge is the time when both the intake and exhuast valve(s)
>are open.

True.  The 268's have an overlap of 44 degrees for instance.

>If I run a intake cam with a longer duration and keep my stock
>exhuast cam than I have to worry that my exhuast side will open up too
>early.

The 16v euro intake cam opens at 13 degrees BTDC, and closes at 57 degrees
ABDC and equates to roughly a 206 degree cam with lift at .378.

>The 272 sounds too extreme, if the euro intake is 253 and the stock
>exhuast cam can be flipped backwards to run as a intake cam somewhere in the
>neighborhood of 253 than it would seem to me that there is less than 20
>degrees in cam difference between the intake and exhuast side, so 260 would
>be pushing it. Anyone?....

The euro intake cam is roughly at 206 degrees, so 260 really isn't on the
wild side too far.  In fact, you usually don't need more aggressive valve
springs until you hit more then .455 of lift.  I think the easiest upgrade
and one of the most rewarding cam swaps is probably the euro intake.
Inexpensive too if you get a regrind, like $70 or so.  dyno plots usually
bear this out.

==Brett

>
>Shannon Fenton
>Telecom Resource Management
>Amazon.com
>206.266.6736

 \/  '84 Scirocco (ITB racer 2B) | "Hot VW's, take two home. They're small"
\/\/ '88 Scirocco 16v (Show), '92 Passat 16v (Winter+) | - brett@netacc.net

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