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aws aws is offline
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Join Date: Feb 2008
Location: Phoenix Arizona
Posts: 156
One of the reasons that the Porsche flat six engine took to turbocharging so well was the stoutness of the bottom end. Eight main bearings and relatively short, robust rods allowed for the tripling of the horsepower output without much penalty in reliability. The obsolete Hemispherical head design also benefited by the lower compression of a flat top piston. My opinion is the longer stroke (76.4) compliments the rev range of the larger displacement turbo engines and adds displacement without increasing the bore. The weak point in these engines is the cylinder to head connection and the larger bore (100mm) cylinders just do not have enough material to insure a bulletproof seal. The largest bore size the factory raced in the 935 days was 97mm---for a good reason.

aws
Old 12-09-2011, 07:17 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)