tyler031734 Posted June 14, 2011 Share Posted June 14, 2011 (edited) Double post... Edited June 14, 2011 by tyler031734 Quote Link to comment Share on other sites More sharing options...
tyler031734 Posted June 14, 2011 Share Posted June 14, 2011 I must bow out. I pictured the rings much closer than on the L28 piston I just checked out. These measured at over 7.5mm under the top. Cut the 2MM off the top of a stock cast piston and gap the top ring a hair further id say. Assuming the KA24's are like the L28 pistons Quote Link to comment Share on other sites More sharing options...
ovenfood Posted June 17, 2011 Share Posted June 17, 2011 I have heard (only on forums) that the to ring wears too quickly, but I know people with L31's and it does not seem to affect them. A friend of mine has a L31 powered 240k 4door (C110) and it is a rally car. His car is not registered and is 100% race orientated. From what he has told me it was about the same as what I have seen in most builds (LD28 crank, L24 rods, KA24 pistons, triple webbers) the car goes like stink :> now as far as the pistons go he has basically found the cheapest cast pistons he can (bout $80 a pop) and he said he can rev to approx 6,000 with out too much trouble. The only issue he gets is after a year of rally's sitting the engine at almost 7,000 all day he gives it a rebuild (replaces the pistons/rings). So from what I have seen cast pistons are great for anything up to spirited daily driving. I am yet to build mine so I can not give first hand experience Quote Link to comment Share on other sites More sharing options...
Tony D Posted June 17, 2011 Share Posted June 17, 2011 ^^^^^^^ ^^^^^^^ Quote Link to comment Share on other sites More sharing options...
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