Mercury 144 Specs
Mercury 144 engine specs: 144 ci (2.4L), 6-cylinder, 3.5" bore x 2.5" stroke, 8.7:1 compression.
Dimensions
| Displacement | 144 ci / 2.4 L |
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| Bore | 3.5" |
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| Stroke | 2.5" |
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| Cylinders | 6 |
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| Compression ratio | 8.7:1 |
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| Bore/stroke ratio | 1.4 |
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| Piston deck clearance | 0.012" |
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Construction
| Block material | cast iron |
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| Head material | cast iron |
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| Valvetrain | OHV |
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| Fuel type | gas |
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| Advertised HP | 90 hp |
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What these numbers mean
| Bore/stroke character | 1.400 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 2,500 ft/min — conservative for a street engine |
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| Displacement per cylinder | 24.0 ci |
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| Static compression | 8.7:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 1.467" |
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| Exhaust valve diameter | 1.266" |
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| Chamber volume | 43.6 cc |
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| Rocker ratio | 1.5:1 |
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| Lifter type | hydraulic |
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Source: NHRA blueprints — nhra.net blueprints
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