I AM A 964 OWNER AND DOING MY VALVES SETTING MYSELF, I WAS WONDERING IF YOUR SYSTEMS HOLDS THE GAPS BETTER OR IS IT JUST AN EASE OF ADJUSTMENT?
Q: “Hi Brad, I am a 964 owner and doing my valves setting myself, I was wondering if your systems holds the gaps better or is it just an ease of adjustment Always good to have new stuff for the 964, thanks for your innovation.”
A: Great questions. The OEM jam nut on the 911 engine has no specified torque and no special method of ensuring it does not loosen. I think many people tend to overtighten it for fear it will loosen but have never heard of an instance where it did loosen. Overtightening can both throw your adjustment off because it rotates the adjustment screw and deform the threads on your adjustment screw/jam nut. 8 to 10 Nm should be adequate.
The gaps change and adjustment is needed every 10,000 miles or so on a 911 because the tip of the valve stem (mushrooming) and valve seat wear over time, not because the valve screw loosens. As the valve wears, adjustment is needed to put the gap back to spec. Excessive clattering or loose valve train noise is more typically caused by maladjustment that made the gap too loose, not valve stem wear or loosening of the jam nut.
The SNAPGAP collar is tightened with a supplied torque wrench to a pre set 10Nm which prevents it from turning or loosening. And, especially in the deep recesses of a 911 engine, there is a great benefit of ease of adjustment as you can see from the animation. https://snapgap.us/pages/how-and-why-snapgap-works With SNAPGAP, it only takes a few minutes to accurately set each valve lash without the need to guess at the correct "feel" or "drag" of a feeler and without the final inaccuracy that results from tightening down the OEM jam nut.
I hope this is useful information.