![]() ![]() ![]() Of course the camshafts are specific (machined from solid for the rigidity), also the valves and springs. Intake and exhaust ducts of the cylinder head have been polished to improve their permeability. the pistons (specific shape) are aluminium forged the conrods are specific (machined from solid with Renault K9K bearings) the crankshaft bearings are specific for heavy duty the crankshaft is extracted from the Renault K9K standard engine !!! The K4M bloc has not been modified (nor bore and stroke) The head intake and exhaust holes can be increased in dimension by only 4% Variable geometry intake and exhaust manifolds are prohibited Valve timing and valve lift : Variable systems are prohibited. Compression ratio : The maximum compression ratio is 13/1. no modification on the oil and water pump single throttle box with a max diameter of 60 mm The FIA regulation on the S1600 categorie concerning the engine relies on the following statements: I wrote an email to renault sport some years ago with this questions and got an answer.ĪS enhenced the Renault K4M engine is, to tune it from 110 HP to 220 HP is a big challenge !! Was it not the k4m that was fitted in the S1600's? After a quick search this is what I found on here: ![]()
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