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.

Tecumseh 34225A Cylinder Head Gasket GENUINE
Tecumseh 34225A Cylinder Head Gasket GENUINE
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NOS Two Briggs  Stratton Cylinder Head Gaskets 2 395008
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NOS Two Briggs  Stratton Cylinder Head Gaskets 2 395007
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Briggs and Stratton Cylinder Head Gasket 272170 NOS
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Gravely Model L 65hp Cylinder Head Super Convertible
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Wheel Horse 416 8 Tractor Onan P216G 16hp Engine Cylinder Heads
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Wisconsin Parts Cylinder head Engine WIS AB111A
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Wheel Horse 416 8 Tractor Onan P216 16hp Engine Cylinder Heads
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Honda GX240 8HP Cylinder Head Rocker Arms Connecting Rod Camshaft Gasket Kit
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Kohler SV 700 720 725 740 Cylinder Head Assemblies With Pistons and Rings
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JOHN DEERE 6X4 GATOR CYLINDER HEAD PART M139489
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VINTAGE BRIGGS CYLINDER HEAD RARE NEW OLD STOCK 291379
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Used Cylinder Head for a 24hp Briggs Intec Twin OHV
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Briggs  Stratton 5HP 130212 Cylinder head GOOD SHAPE NLA 211542
Briggs Stratton 5HP 130212 Cylinder head GOOD SHAPE NLA 211542
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John Deere 210 212 214 300 312 314 316 Kohler cylinder head
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GENUINE Tecumseh 36443 Gasket Cylinder Head Thickness 060 Replaces 33554
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GENUINE Tecumseh 36448 Gasket Cylinder Head
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GENUINE Tecumseh 36626 Gasket Cylinder Head
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Genuine Honda Cylinder Head Gasket Part 12391 ZE1 000 Lawn Mower Parts
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Briggs Stratton OEM 272167 CYLINDER HEAD GASKET NEW IN PKG
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John Deere Kawasaki Liquid Cooled Engine Left Side Cylinder Head M140423 LX279
John Deere Kawasaki Liquid Cooled Engine Left Side Cylinder Head M140423 LX279
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24 318 116 S Kohler 2 Cylinder Head Assembly CV730 CV740
24 318 116 S Kohler 2 Cylinder Head Assembly CV730 CV740
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Onan Cylinder Head 110 2564
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Onan Cylinder Head 110 2563
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Onan Cylinder Heads 110 3508 110 3509
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Allis Chalmers B 210 briggs  stratton 243431 Cylinder head and bolts
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Tecumseh 7HP Toro 7 24 H70 130176D Cylinder head GOOD SHAPE 36446 30938A
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