In engine design the penta engine or penta head is an arrangement of the upper portion of the cylinder and valves that is common in engines using four valves per cylinder.
Honda pent roof head.
Honda motorcycles were using the pent roof combustion chambers around 1962 and i well remember mike hailwood their star rider and world champ pushing a 500cc honda out onto the start grid at the ulster grand prix.
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It is similar in concept to the hemi engine both in design and purpose but a hemispherical cylinder head is limited to only two valves without the use of a.
Once again the europeans were doing it long before anyone else well before americans even used a hemi head.
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Long story short theres no debate here.
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Among the advantages is a faster burn time of the air fuel mix.
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The japanese didnt invent the pent roof.
Various shapes of combustion chamber have been used such as l head or flathead for side valve engines bathtub hemispherical and wedge for overhead valve engines and pent roof for engines.
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