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 425 RH Cylinder Head Part  M139489
John Deere 425 RH Cylinder Head Part M139489
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OEM TECUMSEH CYLINDER HEAD GASKET PART 37796
OEM TECUMSEH CYLINDER HEAD GASKET PART 37796
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cylinder head rebuilt Briggs  Stratton
cylinder head rebuilt Briggs Stratton
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John Deere 425 LH Cylinder Head Part  M139488
John Deere 425 LH Cylinder Head Part M139488
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Briggs and Stratton Part 271867 Gasket Cylinder Head
Briggs and Stratton Part 271867 Gasket Cylinder Head
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Rotary 23 2761 Fir Briggs  Stratton 271866S Cylinder Head Gasket
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Briggs  Stratton Cylinder Head Gasket Set 694013 499890 NEW OEM
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Cylinder head
Cylinder head
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STENS 475 450 CYLINDER HEAD GASKET COVER FOR HONDA 12391 ZE2 020
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Tecumseh 37714 Cylinder Head With Bolts
Tecumseh 37714 Cylinder Head With Bolts
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Briggs  Stratton 799875 Gasket Cylinder Head
Briggs Stratton 799875 Gasket Cylinder Head
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Briggs  Stratton 590411 Head Cylinder
Briggs Stratton 590411 Head Cylinder
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Briggs  Stratton Cylinder Head Right Part No796270
Briggs Stratton Cylinder Head Right Part No796270
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Briggs Stratton Cylinder Head Left Part No 793559
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Rotary 1483 Cylinder head gasket Replaces BS 270340
Rotary 1483 Cylinder head gasket Replaces BS 270340
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New Kawasaki OEM Cylinder Head 11008 7023
New Kawasaki OEM Cylinder Head 11008 7023
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Honda OEM GXV340 Cylinder Head Complete
Honda OEM GXV340 Cylinder Head Complete
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Gravely Model L Walk behind Mower 76hp Cylinder Head Super Convertible
Gravely Model L Walk behind Mower 76hp Cylinder Head Super Convertible
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NEW OEM BRIGGS  STRATTON 692110 CYLINDER HEAD GASKET
NEW OEM BRIGGS STRATTON 692110 CYLINDER HEAD GASKET
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NEW OEM BRIGGS  STRATTON 4122 CYLINDER HEAD GASKET PACK OF 5 272200S
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NEW OEM BRIGGS  STRATTON 272164 CYLINDER HEAD GASKET
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NEW OEM BRIGGS  STRATTON 694088 CYLINDER HEAD PLATE GASKET
NEW OEM BRIGGS STRATTON 694088 CYLINDER HEAD PLATE GASKET
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NEW OEM BRIGGS  STRATTON 692230 CYLINDER HEAD GASKET
NEW OEM BRIGGS STRATTON 692230 CYLINDER HEAD GASKET
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NEW OEM BRIGGS  STRATTON 692231 CYLINDER HEAD GASKET
NEW OEM BRIGGS STRATTON 692231 CYLINDER HEAD GASKET
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NEW OEM BRIGGS STRATTON 272163S CYLINDER HEAD GASKET LOT OF 2
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NEW OEM BRIGGS  STRATTON 272171 CYLINDER HEAD GASKET
NEW OEM BRIGGS STRATTON 272171 CYLINDER HEAD GASKET
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NEW OEM BRIGGS  STRATTON 272157S CYLINDER HEAD GASKET
NEW OEM BRIGGS STRATTON 272157S CYLINDER HEAD GASKET
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Briggs and Stratton Cylinder head assembly part  590525 and part  590513
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Briggs  Stratton cylinder head 691715
Briggs Stratton cylinder head 691715
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Clinton D4 Chainsaw Block Cylinder Head
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NOS Lot 160 Small Engine Gaskets Cylinder Head + Briggs  Stratton Tecumseh
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Kohler Command PRO 12HP CS12 CS12T Cylinder head baffle shroud cover GOOD SHAPE
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New Kawasaki OEM Cylinder Head 11008 7020
New Kawasaki OEM Cylinder Head 11008 7020
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Husqvarna 225B 27cc Blower OEM Piston Cylinder Head
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Wheel horse 211 4 ENGINE CYLINDER HEAD BRIGGS  STRATTON 11 HP 252707 5
Wheel horse 211 4 ENGINE CYLINDER HEAD BRIGGS STRATTON 11 HP 252707 5
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MTD Huskee Tractor Briggs  Stratton 407777 21hp Engine Cylinder Heads
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Husqvarna Mondo Trimmer Weed Eater OEM Piston Cylinder Head  Muffler
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Briggs  Stratton 791716 Cylinder Head Gasket
Briggs Stratton 791716 Cylinder Head Gasket
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Briggs  Stratton 794114 Cylinder Head Gasket
Briggs Stratton 794114 Cylinder Head Gasket
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John Deere Kawasaki 9HP Cylinder head RX75 SX75 SRX75 SRX95 RX95 GX70 GX75 7
John Deere Kawasaki 9HP Cylinder head RX75 SX75 SRX75 SRX95 RX95 GX70 GX75 7
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Briggs  Stratton 796475 Cylinder Head Gasket
Briggs Stratton 796475 Cylinder Head Gasket
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Kawasaki Cylinder Head 11008 7020 Fits FH Engine Series
Kawasaki Cylinder Head 11008 7020 Fits FH Engine Series
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STIHL FS80 Trimmer Weed Eater Cylinder Head
STIHL FS80 Trimmer Weed Eater Cylinder Head
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Cub Cadet 1315 Mower Kohler Command CV125S 125hp Engine Cylinder Head
Cub Cadet 1315 Mower Kohler Command CV125S 125hp Engine Cylinder Head
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JOHN DEERE 318 ONAN B43G CYLINDER HEADS
JOHN DEERE 318 ONAN B43G CYLINDER HEADS
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Echo SRM 2400 236cc Trimmer Piston Cylinder Head
Echo SRM 2400 236cc Trimmer Piston Cylinder Head
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WISCONSIN CYLINDER HEAD AB 112 X
WISCONSIN CYLINDER HEAD AB 112 X
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Weed Eater Featherlite FX26SCE Trimmer Weed Eater Cylinder Head
Weed Eater Featherlite FX26SCE Trimmer Weed Eater Cylinder Head
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Briggs  Stratton 807986 Cylinder Head Gasket Replaces  805111
Briggs Stratton 807986 Cylinder Head Gasket Replaces 805111
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Briggs  Stratton 809186 Cylinder Head Replaces  808384 807822
Briggs Stratton 809186 Cylinder Head Replaces 808384 807822
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Briggs  Stratton 809185 Cylinder Head Replaces  808383 807821
Briggs Stratton 809185 Cylinder Head Replaces 808383 807821
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Cylinder Head Gasket 47 041 10 4704110 47 041 15 S
Cylinder Head Gasket 47 041 10 4704110 47 041 15 S
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Briggs  Stratton 820648 Cylinder Head Gasket Replaces  820152
Briggs Stratton 820648 Cylinder Head Gasket Replaces 820152
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Tecumseh Cylinder Head gasket  36061 ULT VLV VLXL
Tecumseh Cylinder Head gasket 36061 ULT VLV VLXL
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Kohler OEM Cylinder Head Gasket 6304116 S New RP
Kohler OEM Cylinder Head Gasket 6304116 S New RP
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Briggs  Stratton 842622 Cylinder Head Gasket
Briggs Stratton 842622 Cylinder Head Gasket
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Kohler OEM Cylinder Head Gasket 6304122 S New RP
Kohler OEM Cylinder Head Gasket 6304122 S New RP
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Tecumseh 32246B Engine Cylinder Head Gasket Genuine OEM NEW
Tecumseh 32246B Engine Cylinder Head Gasket Genuine OEM NEW
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Craftsman 358355140 14 Chainsaw OEM Piston Cylinder Head
Craftsman 358355140 14 Chainsaw OEM Piston Cylinder Head
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Tecumseh Cylinder Head gasket 29953 29953c H HSK +
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Tecumseh Cylinder Head gasket 33015 33015a ECV100 +
Tecumseh Cylinder Head gasket 33015 33015a ECV100 +
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Homelite Backpacker PS01525 Back Pack Blower Cylinder Head
Homelite Backpacker PS01525 Back Pack Blower Cylinder Head
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Tecumseh 29953 29953A 29953B 29953C Head Cylinder Gasket For Sears 465427
Tecumseh 29953 29953A 29953B 29953C Head Cylinder Gasket For Sears 465427
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H30 H35 Tecumseh CYLINDER HEAD 30579A 36438 VINTAGE MINI BIKE
H30 H35 Tecumseh CYLINDER HEAD 30579A 36438 VINTAGE MINI BIKE
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Briggs  Stratton 500 SERIES 158cc Cylinder Head
Briggs Stratton 500 SERIES 158cc Cylinder Head
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Kohler 175 cylinder head John Deere  P N 12 098 22 S CV491S
Kohler 175 cylinder head John Deere P N 12 098 22 S CV491S
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TECUMSEH 143 196042 CRAFTSMAN USED CYLINDER HEAD IN VERY GOOD CONDITION
TECUMSEH 143 196042 CRAFTSMAN USED CYLINDER HEAD IN VERY GOOD CONDITION
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Tecumseh LEV100 340044D Cylinder Head  Bolt Set 36825 37714
Tecumseh LEV100 340044D Cylinder Head Bolt Set 36825 37714
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Kohler Command PRO 6HP CS6 CS6T Cylinder head assembly GOOD SHAPE 63 318 08 S
Kohler Command PRO 6HP CS6 CS6T Cylinder head assembly GOOD SHAPE 63 318 08 S
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Kohler Command PRO 6HP CS6 CS6T Cylinder head baffle shroud cover GOOD SHAPE
Kohler Command PRO 6HP CS6 CS6T Cylinder head baffle shroud cover GOOD SHAPE
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Tecumseh TVS90 43392F Cylinder Head  Bolt Set 34335 36474
Tecumseh TVS90 43392F Cylinder Head Bolt Set 34335 36474
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Briggs  Stratton 95902 3107 01 Cylinder Head 690386 213942 214277
Briggs Stratton 95902 3107 01 Cylinder Head 690386 213942 214277
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