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.

John Deere 112 Tecumseh 10hp HH100 cylinder head
John Deere 112 Tecumseh 10hp HH100 cylinder head
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kawasaki FH770D 1 CYLINDER HEAD 11008 7030
kawasaki FH770D 1 CYLINDER HEAD 11008 7030
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Genuine Honda 12251 ZE2 801 Cylinder Head Gasket GX240 GX240K1 GX240U1 WT30X OEM
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John Deere M152699 M42202 Engine Cylinder Head Gasket  Lot of 1
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24 318 149 S KOHLER 2 CYLINDER HEAD KIT 24 318 66 S CH23 CH25 CH730 CH740 CH745
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Honda GX340 GX390 cylinder head assembly
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Tecumseh 4HP H40 55046G Cylinder head 36446
Tecumseh 4HP H40 55046G Cylinder head 36446
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Kawasaki FB460V Cylinder Head A1001 2151
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briggs and stratton 100602 CYLINDER HEAD 793502 CAM GEAR GOVERNOR
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1 Briggs Stratton Part 710205 Cylinder Head Gasket
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New Rotary Brand Cylinder Head Gasket 23 1482 698717 272536S BS 94
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Honda GX160 55 hp PISTON RINGS FITS 55HP ENGINE AND CYLINDER HEAD GASKET
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Genuine Honda 12251 ZH7 801 Cylinder Head Gasket GX120U1LXM2 GX120U1SKB2 OEM
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briggs stratton cylinder head 808382
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CYLINDER HEAD ROCKER ARMS PISTON KIT AIR FILTER CONNECTING ROD HONDA GX160 55HP
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Tecumseh 29953 Cylinder Head Gasket 29953A 29953B 29953C
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Kohler Cylinder Head Part 24 318 18 S
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