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Old 03-22-2017, 04:40 AM   #1
1998 Boxster
Join Date: Aug 2012
Location: Lakewood, Ohio
Posts: 110
Cam index notch orientation

Hi. I've had the heads off my '98 Boxster for a couple years and am finally putting it back together. While I've done a lot of reading regarding timing the cams, I often end up being just short of completely confident.

My question is about the orientation of the indexing notches on the
intake cams.

On bank 1- when #1 cylinder is at tdc compression, the index notch on the intake cam is pointing away from the engine....


Where is the index notch pointing on the intake cam of bank 2. (meaning cylinder #4 is at tdc exhaust)

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Old 03-23-2017, 10:01 AM   #2
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Join Date: Aug 2003
Location: Wisconsin
Posts: 2,062
DIY: Setting Cam Timing on M96
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster bought new. Installed used motor at 89k.
1987 924S . 2002 996TT. PST2
Owned and repaired Porsches since 1974. Have driven them all the way the Dr intended...
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Old 03-24-2017, 04:06 AM   #3
1998 Boxster
Join Date: Aug 2012
Location: Lakewood, Ohio
Posts: 110
Paul, thanks for posting that link. I have read it many times and have found it to be the single most concise, useful, informative, easy to understand tutorial on setting timing that I have found. However, insite's write-up is timing an assembled engine. I am in the process of installing the cams into the engine and am asking specifically what the relationship is between the indexing notch on the bank two came relative to the indexing notch on the bank 1 cam. Insite's write-up perfectly shows the position of the notch for bank 1 in both tdc compression as well as tdc exhaust, but does not show the corresponding position of the notch for the bank 2 cam.

I've since learned from another poster on another forum that when properly timed, the notches from both banks will either both be pointing in, or both be pointing out...meaning, if the bank 1 notch is pointing out when the engine is at tdc compression for cylinder #1, then the notch on the cam for bank 2 will also be pointing out (away from the engine).

Can anyone concur?

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