MG Midget XPAG Engine Tuning - Seite 4
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Textauszug von dieser Seite (Leseprobe)
Wichtig: Der Text wurde automatisch aus dem PDF extrahiert, weshalb Schreibfehler durchaus vorkommen können.
... I. Higher Compression Ratio Tuning (8.6 to I) The engine is raised to 8-6 to I compression ratio by removing ^" from the cylinder head face. The standard head is 76-75 mm. thick ; the finished thickness after machining should be 74.37 mm. Remove any frazes left, and polish, but do not grind out the com bustion chambers as these are already quite clean and are machined nearly all over. Make sure the gasket edges do not overlap the combustion spaces. The ports may be ground and polished, but should not be ground out so heavily that the shape or valve choke diameter is impaired. The inlet port outer separating stud boss may be ground away slightly—about -fa* off each side (still maintaining its streamline shape)—so that oblong ports are obtained, 1^" high, §|" wide (minimum). Do not remove this boss completely or it will affect mixture distribution. Matchup, by grinding, all the exhaust and inlet manifold ports with the cylinder head ports. Grind out and polish the inlet manifold, also matching the car buretter bore. (a) Use standard cylinder head gasket. (£>) Use -332" thickxf" O.D. washers under cylinder head nuts (to correct for reduced head thickness). (c) Use 4 rockershaft bracket packing pieces. (Fitted under base of bracket to correct the rocker adjustment.) M.G. Part No. M.G. 862/459—^" thick mild steel ...Source:Archiv
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| Vehicles in this Facsimile | MG TC (1949) MG TB (1936) |
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