Sketch and Explain F-head combustion chamber.
In F-head combustion chamber one valve is in head and other in the block. This design is a compromise between L-head and I head combustion chambers.
Advantages are :
High volumetric efficiency
Maximum compression ratio for fuel of given octane rating
High thermal efficiency
It can operate on leaner air-fuel ratios without misfiring.
Drawback
This design is the complex mechanism for operation of valves and expensive special shaped piston.