Pent Roof Cylinder Head

The configuration allows for four valves per cylinder something a hemi head simply cannot afford.

Pent roof cylinder head.

The head project was conceived by charlie yapp as a tribute to the original robert roof cyclone valve in head and newly designed with modern engineering by chief engineer jim roof with help. Penta as in penta head means five as noted above. The pent roof combustion chamber was reputedly used first in the engine of the 1904 welch model 4 0 built by the welch motor co pontiac mi. When the spark plug is located in a central position the flame spreads a minimum distance in all directions allowing for a balanced and clean ignition of the fuel mix inside the combustion chamber.

Pent roof combustion chambers were also used by chrysler between 1951 and 1958 when it was discontinued due to high costs. Cylinder heads with pent roof and semi hemi combustion chambers and longer duration camshafts allows for higher compression ratios than bath tub or wedge combustion chambers and short duration cams. A pent roof combustion chamber has no similarity to five ness or a single faced wedge. Pent as in pent roof pentroof engine is a type of combustion chamber while pentaroof is not used the same way.

Some more information if you re interested. With modern improvements to enhance power and reliability. Pentroof improved upon the hemi of course its newer and put two valves for intake and two for exhaust for better flow. That alone will cost plenty of money to do and will provide huge performance increase over your old worn out engine.

You already have a 4 valve pent roof cylinder head most domestic pushrod engine owners would kill for. Known for very turbulent combustion it works well for diesel engines but was deemed excessively noisy for american standards. It consists of a flat cylinder head deck with a single row of valves facing a circular cavity cast into the piston. Our roof 101 cyclone four port ohv cylinder head conversion tm is a faithful reproduction of the original robert roof 1928 roof cyclone.

In a pent roof configuration the intake and exhaust valve heads face in opposition to one another forming a v shape. Just get a good valve job done and take care of everything else that needs doing. An annular squish region is created around the piston perimeter. While pent as in pent roof means single sided wedge shape as in a window awning.

So now you guys have a general idea of the differences between engine designs. 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. This design has also long proved ideal in that the spark plug is most optimally located right in the center of the four valves. Thirdly the design and size of the combustion chamber as well as the cam timing and overlap period also affects the possible compression ratio.

Among the advantages is a faster burn time of the air fuel mix.