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2.4l Opel 8V CIH Competition EngineShort Engine Specification
The block is a 2.0l unit, which has been used for about 50,000 miles. This is very important as the stress in the block, from manufacturing, will have been relieved. The block was bored and honed to allow installation of 0.50mm oversize pistons. The steel billet crankshaft was manufactured by Farndon Engineering Ltd, and has an 85mm stroke, and has two dowel pins as well as six bolts to hold the flywheel in place. The I-beam con rods are also manufactured by Farndon, having 55mm big ends, 22mm little ends, and are 137.1mm between centres. The pistons are modified 95.5mm Mahle pistons, used in the 2.4i Frontera and 1988 Omega. The crankshaft, flywheel and clutch cover have been balanced to race standard. the con rods and pistons have all been weight matched. The sump is baffled to keep the oil where it's needed. A block breather has been installed, located where the original mechanical fuel pump was fitted. We require an 11-1 static compression ratio for the engine, which will run Super Unleaded (97 RON) petrol. The engine is designed around the work done by Peter Fisher, at SP Performance Centre, on the cylinder head. Therefore, the inlet valve pockets in the piston tops had to be enlarged, the exhaust valve pockets are unchanged. This also meant that the block, timing cover and piston tops needed to be skimmed to give the correct combustion chamber size. At this compression it is often a good idea to have the cylinder bore tops machined for copper wire rings, to enhance cylinder head gasket seal performance. The oil pump delivery pressure will be increased as required by the new configuration. Back to Top |
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