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.
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.
Pent roof has emerged as the dominant combustion chamber geometry and is used ubiqutoesly by all automotive engine manufactureres across the board and its.
The combustion chamber is sunken into the cylinder head and commonly contains a single intake valve and a single exhaust valve.
Long story short theres no debate here.
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.
Once again the europeans were doing it long before anyone else well before americans even used a hemi head.
Pent roof combustion chambers were also used by chrysler between 1951 and 1958 when it was discontinued due to high costs.
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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.