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The BMW Range
3 Series
E30-325 head on a 320 block
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<blockquote data-quote="ALBundy" data-source="post: 57028" data-attributes="member: 15"><p>M20B20 head + M20B25 block = Good Torque but lesser hp (top end)</p><p></p><p>M20B20 cylinder head has smaller valves and inlets, that restricts the amount of air+petrol mixture into the combustion chamber and hence the lesser top end, but it will help to generate some low end torque. As to how it actually works, just read some basic engine principles, its related to the inlet and exhaust valve opening duration at low and high rpms.</p><p></p><p>Rgds</p></blockquote><p></p>
[QUOTE="ALBundy, post: 57028, member: 15"] M20B20 head + M20B25 block = Good Torque but lesser hp (top end) M20B20 cylinder head has smaller valves and inlets, that restricts the amount of air+petrol mixture into the combustion chamber and hence the lesser top end, but it will help to generate some low end torque. As to how it actually works, just read some basic engine principles, its related to the inlet and exhaust valve opening duration at low and high rpms. Rgds [/QUOTE]
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E30-325 head on a 320 block
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