When using the ~10 # 1965 Jag pulley reversed and bolted to the VW pulley hub (machined down VW pulley) one also needs to use the 356 porsch generator pulley along with it's washers and pulley nut. It really is a better design than the VW pulley and it is smaller thus requiring the use of a welded and balanced fan. I plan on using the mexican VW alternator pulley with built in fan on the rear as the Jag pulley is further out and requires a spacer anyway. To do this I cut the hub right at the surface of the rear pulley half. Current belt is a 15x350mm however when the correct porsch nut and spacers come then I will find the correct belt size. The 15 mm sits too far up on the "V" groove so I plan on using a 13x 345 or 340mm whiver fits better. You want it deeper in the grouve to prevent throwing a belt. Bob Hoover said it best "You are the mechanic in charge." And something like once you change one part everything it works with must be checked /modified to fit also. (Bad paraphrase). Changing the lower pulley effects the pulley to fan gear ratio, poth pulleys alignment, and the belt length. On Jon Karcey's 1st engine he had a generator and used the VW stock generator pulley if I decifer the "Dune Buggies and Hot VW's" magazine pictures correctly. In the 1982 pictures of his engine he has an alternator with the smaller 356 porsch pulley. The stock doghouse fan according to Jake Raby makes more pressure when spun faster, it just must be welded or it has a tendency to granade. Pressure is what drives the cooling air flow through the hot fins in the aircooled head, wheather its VW, porsch, or an airplane motor. Buglover34465.
When using the ~10 # 1965 Jag pulley reversed and bolted to the VW pulley hub (machined down VW pulley) one also needs to use the 356 porsch generator pulley along with it's washers and pulley nut. It really is a better design than the VW pulley and it is smaller thus requiring the use of a welded and balanced fan. I plan on using the mexican VW alternator pulley with built in fan on the rear as the Jag pulley is further out and requires a spacer anyway. To do this I cut the hub right at the surface of the rear pulley half. Current belt is a 15x350mm however when the correct porsch nut and spacers come then I will find the correct belt size. The 15 mm sits too far up on the "V" groove so I plan on using a 13x 345 or 340mm whiver fits better. You want it deeper in the grouve to prevent throwing a belt. Bob Hoover said it best "You are the mechanic in charge." And something like once you change one part everything it works with must be checked /modified to fit also. (Bad paraphrase). Changing the lower pulley effects the pulley to fan gear ratio, poth pulleys alignment, and the belt length. On Jon Karcey's 1st engine he had a generator and used the VW stock generator pulley if I decifer the "Dune Buggies and Hot VW's" magazine pictures correctly. In the 1982 pictures of his engine he has an alternator with the smaller 356 porsch pulley. The stock doghouse fan according to Jake Raby makes more pressure when spun faster, it just must be welded or it has a tendency to granade. Pressure is what drives the cooling air flow through the hot fins in the aircooled head, wheather its VW, porsch, or an airplane motor. Buglover34465.
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