General questions for setting cam timing

[BGCarrera32]

Hi all:

I have a '84 3.2 rebuild that is coming together with Mahle 10.3:1 Ps and Cs using a 964 cam grind, the cam being spec'd to 1.26 mm on overlap for setup (all Motronic stuff).

Questions:

1) When you set your cam timing, how tight do you shoot for getting the timing chains when doing the process? I have the Stomski mechanical tensioners that I plan to use for setting the timing and will then swap out with the factory pressure fed tensioners when complete.

2) What sort of variance in mm is acceptable between the 1-3 and 4-6 cam? I set cam timing on a 911 engine before but it has been years... Obviously having them the same is ideal but I don't see 1.26 vs. 1.26 L to R bank as realistic.

Thanks for your input.

BG

[GG Allin]

I was able to get mine timed to 4.83 & 4.84 just recently. I noticed I would lose a little advance if I didn't hold it tight with the sprocket tool. I suppose there is some play in the pins. But it wasn't too difficult to get right.

[Flat6pac]

Once the bolts are tight nothing is going to change
I do like Steve’s video on setting cam timing. He has a way I never thought of doing for nearly 40 years but it works great
Bruce

[Classic 911]

Interesting.


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[Classic 911]

Great video by Steven

[356Lion]

Hey Guys,
I'm sure that Steve (Steven) is amazing and well known; but for those of us new to Pelican, it sure would help if you provided a video link so that we too could learn from his knowledge.
John

[Classic 911]

Originally Posted by 356Lion

Hey Guys,
I'm sure that Steve (Steven) is amazing and well known; but for those of us new to Pelican, it sure would help if you provided a video link so that we too could learn from his knowledge.
John

Hi,

Here’s a great set of videos from Steven

One important thing to keep in mind regarding the method used in the video for cam timing is:
- when used for camshafts with high overlap all rockers must be installed so that the camshaft does not move during the timing procedure.

https://www.stomskiracing.com/pages/instructions


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[JoeMag]

You can achieve values "in-between" two holes if you do end up landing somewhere, where the pin does not fit.

If you need to slightly more retard the cam, turn the motor until you have lash, loosen the cam sprocket bolt, and turn the motor CW until the rocker is starting to ride on the cam. This will take up the slop in the pin hole and push the cam slightly to retard. Torque down the cam nut.

If you need slightly more advance, do the same thing but turn the motor CCW.

I've found through timing my race cams with degree wheel, each hole is worth ~2.7 degrees of lobe angle (ie: intake lobe is at 105, advance cam 1 hole and ya end up at ~102.3).

[356Lion]

Thanks Classic911!
John