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I had to take the timing cover off my '69 912 and, after replacing it and setting the timing, it seems to be 'knocking' at idle. The manual contradicts itself by saying 5 degrees in one place and 3 in another for advance at idle. Either way it's knocking at 3 or 5. I thought maybe my ears aren't in tune with the high compression ratio engine, but it does sound a bit wrong. It's a 1720cc engine with an 050 distributor. I've changed the points, condensor, rotor arm and cap. Could it be a dwell angle problem, should I be using a lead additive, is the advance different for Shasta pistons, should I try some different plugs (I've got the ones recommeded in the Duane Spencer book)? Any ideas?
Here's a picture of the engine - not much help with my problem, but doesn't it look nice!
http://www.soton.ac.uk/~aijf197/Engine.jpg
Thanks Alex
Here's a picture of the engine - not much help with my problem, but doesn't it look nice!
http://www.soton.ac.uk/~aijf197/Engine.jpg
Thanks Alex