Originally Posted by
Karl
You CANNOT use the lean burn 1.6cvh head on a std RS turbo bottom end. This is because the std RS turbo has a 2mm piston protrusion at TDC above the deck height. The head gasket is only 1.5mm thick, and hence if you fit the lean burn head to a std RS turbo bottom end, the pistons will make heavy contact with the combustion chamber "beak" resulting in horrendous noise and bent con-rods!!
A second issue is the high compression ratio this results in, but that is insignificant in comparison to the 1st problem!!!!!
Hi Karl looking for a little help here. Going to double check everything but getting 1.5 mm taken off me pistons crowns to give me a CR off 8.6:1. My head has been skimmed a lot and turned out at 48.5cc. Do you think I will have enough squish clearance? I have enough piston to valve clearance I think ( around 2mm ) just worried about my head hitting pistons. Valves are only about 1mm deeper than the face off the head as been skimmed that much.