find yourself a book, and a timing light to do it right...search a little on the web for a MK 1 fanatics web page that may have diagrams...
when your fanatical yourself, you can post all kinds of stories and specs and stuff yourself...! :)
It wouldn't necessarily run better at all - it all depends on your ignition and timing setup and compression ratio.
You have an ignition Control Module that you can check that controls ignition timing Throttle Position Sensor that tells the computer where the throttle is so it can regulate and give the correct air fuel ratio.
The lowest compression ratio of a compression-ignition engine that allows a specific fuel to be ignited by compression ignition.
Reducing an engines need for higher octane fuel requires lowering the static compression ratio of the engine(changing heads and/or pistons) and retarding the ignition somewhat. Cars with a static compression ratio of 9:1 or less can run on "regular" with just dialing back the ignition timing and not pushing the engine hard. Reducing compression ratios or retarding timing will cost you power however, and may cause your engine to run less efficiently(higher emissions). on modern computer controlled cars, changing the ignition timing is far more difficult than on a vehicle with a standard distributor.
23:1 compression ratio
For a Briggs and Stratton motor 3.5 motor used straight gas and oil in the crank-case, there is no ratio.
The compression ratio is 8.5:1 supercharged motor and 9.4:1 for the non-supercharged motor.
S.I Engine lower compression Ratio is 6 to 11
The pressure ratio does not cause pinging in an internal combustion engine. Pinging is the result of the air/fuel mixture igniying before the piston is in the propper position. Chep gas will cause pinging because it is igniting too quickly. Too high a compression ratio will do the same thing. Ingnition timing that is too far advanced will do the same thing. Back off your ignition timing two degrees at a time until the pinging stops, or buy a higher octane fuel.
Mixing ratio should be 50:1
ratio of energy output to energy input.
40:1 ratio