@tauncfester3022

2 weeks ago

Had a '62 Saab 96 with the bullnose bonnet and the original 36 hp engine and it was marginal for travel on highways, so decided to convert to a 46 hp Shrike engine from a '66 long-nose 96. The differences are the older engine has a tiny water pump on the back of the generator and the newer engine has the water pump up front on the head. Also volume pumped is vastly different as the older pump is barely big enough, it would be strained to pump water on a typical 500 cc motorcycle. It's more of a pump assisted thermo-syphon set up. At any rate with the conversion done, the new engine runs fine but has an overheating issue from having to use the stock radiator, (that sits behind the engine on a shelf, just above where the firewall bends to the rear..) that has two smaller outflow pipes at the bottom, one forward to the water pump and the other rearward to the heater core. Well the fix was to make a Y from the 2 outflows at the radiator bottom, which are one inch roughly exit pipes, into a 1.5 diameter return pipe with a smaller 1" feeder off it, (downstream of the Y..) to the heater core. The heater cores on these cars are really efficient and can substantially heat the interior despite using the already cooled water from the radiator. But the bullnose does have a cold weather spring loaded blind on the bonnet's air intake because Arctic Winters in Northern Sweden, and it needs this when temps are below freezing. Plus you really have to use the exhaust stove to aircleaner hose on any temps below 34 degrees with any humidity. Pretty amazing cars but problems with engine temperature control can be hard to diagnose. Good luck with your adventure.

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