Cylinder Head

Why aren't injectors placed in the cylinder head in petrol engines?

They use injectors in the cylinder head in diesel engines , why not in petrol engines.

This is often referred to as direct injection.
It can be used to reduce emissions and provide an ultra lean burn engine for better efficiency.
The 1955 Mercedes-Benz 300SL was the first sports car to use direct fuel injection. Many WW ll aircraft used direct injection. Since then, several automobile manufacturers have introduced direct injected gasoline engines.
The down side seems to be cost - both the cost of research and development along with the required high pressure pump and computerized injection timing.
The three way catalytic converters, for instance, are a much more cost effective way to meet present emission standards.
However, given the significant advantages of direct injection and the technological gains in computerized engine controls, I suspect we will be seeing a lot more direct injected engines in the near future.

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Genuine Briggs  Stratton Part 272200 Cylinder Head Gasket New OEM Part
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John Deere 110 Tractor Kohler K241 10hp Engine Cylinder Head
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Sears Craftsman 25cc Gas 2 Stroke 358794600 Blower Piston Cylinder Head
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TORO WHEEL HORSE 212 H HYDRO ONAN 125 HP COMPLETE CYLINDER HEAD
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Air Filter Briggs  Stratton Fits16 and 18 L Head Twin Cylinder Vertical Engines
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Kohler Cylinder Head 2 24 318 116 S CH22 23 CV22 24318116 24 318 72
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Scag John Deere Kawasaki FD620 D FD620D FD661 Complete Cylinder Head Set Heads
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Dolmar Robin Makita RBL500 EC049G Back Pack Blower Piston Cylinder Head
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Husqvarna 223L 25cc Trimmer Weed Eater OEM Piston Cylinder Head
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Simplicity Landlord 18hp Hydro Briggs Stratton 350777 18hp Engine Cylinder Heads
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Gravely L cylinder head
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HONDA HT 3813 Twin Cylinder Head
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Honda HT3810 Lawn Tractor Cylinder Head
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Briggs  Stratton 690888 Cylinder Head Gasket Replaces  806086 690888
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