Engine Cold Start

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The engine, on cold start runs at about 5.5 bars of oil pressure (80 PSI). Once it warms up to operating temperature it will hover around 4 bars (58 PSI). The engine has 77,000 original miles on it, and all four cylinders show exactly 140 PSI on a compression test. A good compression for a 1976 MGB engine is 120-150 PSI or slightly higher, but consistency between cylinders is more important than the exact numbers. Readings of 125-130 PSI are considered good.

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Fast Idle

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Slow Idle

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At slow idle the engine is rock steady, with no perceptible shake.

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Slow Idle – Exhaust Tone

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You will notice that there is a smooth exhaust sound, albeit a bit sporty, coming from the full length, triple chromed muffler/tailpipe.