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Case Clearancing Special Note

    Did you know that our 86mm Porsche rod crank fits in the same case clearancing space as a 78mm VW rod crank. This means that there is no strength difference in the case with the standard case clearancing that we have done for years. You can install OUR 86mm crank with no concern as to strength loss or engine life.
    Note 1: Longer than 86mm stroke cranks (such as 88mm and 90mm) can be installed in the stock VW case.
    The extra clearance to case or camshaft is not the issue; it is the cylinder length and tinware fit. The cylinders are not long enough to keep the piston straight at the bottom of the stroke. Strokes longer than 86 pull the piston too far out the bottom of the cylinder, it rocks, unloading the rings and puts extreme side load on the bottom of the cylinder causing blow-by and often piston and cylinder breakage. Some people use an aftermarket cylinder that is longer. I, personally, have not had any of the aftermarket cylinders work correctly for longevity or cooling. All my engines require all of the proper cooling fins and the material quality. What I did was to have the bottom of the Cima/Mahle cylinder extended. Unfortunately, this is very expensive to do. The set we had extended cost over $375, obviously only for the serious builder.

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