I did a turbo mini for a speedway car (Rob Simpson) back in the 80's
1300 block bored out with 1200 flat top Datsun pistons. 1300 crank offset ground to take S rods (smaller journal size) gave capacity of 1440, and a static compression of 8:1 with standard thickness gasket. S inlet and exhaust valves, 649 cam. IHI RHB6P11 turbo blowing through Weber DCOE 45. Sealed bearings on the butterfly spindle, and the float chamber vented into the airbox so float chamber saw same air pressure as venturis. Plastic Del'Orto floats in the carb as the standard Weber sheet brass ones would collapse under pressure and sink, causing flooding and fire. Fuel pump was from a Triumph 2.5PI, boost controlled modulator valve controlled the fuel pressure so it was always about 4 psi higher than boost pressure. No intercooler but we did try water injection via windscreen washer bottle and pump switched on by a pressure switch (vauxhall viva oil pressure switch) when boost was over 8 psi. Max boost was 10 psi controlled by wategate. Turbo was located over the clutch housing and oil drained back though the transfer gear breather hole. Exhaust manifold was fabricated from thickwall square tubing but was always cracking, cast iron would have been better. dyno testing on rolling road saw over 130hp at the wheels and, once the float problem was sorted, extremely reliable. Won a 2.3 litre class for a number of seasons until turbos were finally banned in that class.
If some of the items used look a bit "quaint" remember that in the early 80s there were very few turbo cars on the road apart from Mitsi Cordias and Tredias and aftermarket turbo accessories just could not be found in NZ
it's not a bad thing till you throw a KLR into the mix.
those cheap ass bitches can do anything with ductape.
(PostalDave on ADVrider)
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