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.

NEW CYLINDER HEAD FOR 8HP 9HP FITS HONDA GX240 GX270
NEW CYLINDER HEAD FOR 8HP 9HP FITS HONDA GX240 GX270
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NEW HONDA CYLINDER HEAD GASKET FITS GX340 11HP
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Cylinder Head Gasket For Tecumseh 33554 36443 Also Sears 465393
Cylinder Head Gasket For Tecumseh 33554 36443 Also Sears 465393
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John Deere 165 175 185 Hydro KAWASAKI FC 540V CYLINDER HEAD COMPLETE WITH VALVES
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CYLINDER HEAD KIT FOR HONDA GX160 55HP ROCKERS PUSH RODS GASKET SPRINGS VALVES
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TROY BILT CHIPPER VAC model 47021 TECUMSEH TVS 115 CYLINDER HEAD
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Genuine Tecumseh Cylinder Head Gasket 36932 Tecumseh Engine TB86
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Toro GTS Lawn mower Suzuki engine VMH7 Cylinder head GOOD SHAPE 81 3700
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5 HP BRIGGS AND STRATTON CYLINDER HEAD with head bolts FREE SHIP 130207
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AM132457 CYLINDER HEAD COMPLETE FOR JOHN DEERE LX288 BRIGGS STRATTON 18 HP
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AM132458 CYLINDER HEAD COMPLETE FOR JOHN DEERE LX288 BRIGGS STRATTON 18 HP
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Briggs  Stratton 21 Hp Ohv I C V Twin Model 407777 Cylinder Head 2
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New Briggs Stratton Lawnmower Part Cylinder Head 493457 NOS
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HONDA GX200 65HP PISTON KIT RINGS PIN CLIPS CYLINDER HEAD GASKET CONNECTING ROD
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515 778 Cylinder Head Assembly Honda 12210 ZH8 415
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515 774 Cylinder Head Assembly Honda 12210 ZH7 415
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515 786 Cylinder Head Assembly Honda 12200 zh9 405
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515 782 Cylinder Head Assembly Honda 12210 zl0 405
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Briggs Stratton Cylinder Head Gasket 794114 NEW OD
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Kawasaki FA130D AS15 CYLINDER HEAD
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Briggs stratton 10 14HP Cylinder head Good shape 494240
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Briggs and Stratton 271866S Cylinder Head Gasket Sears Craftsman 271866
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Genuine Kohler 45 041 17 GASKET CYLINDER HEAD
Genuine Kohler 45 041 17 GASKET CYLINDER HEAD
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Genuine Kohler 20 318 14 KIT CYLINDER HEAD
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Genuine Kohler 24 841 04 KIT CYLINDER HEAD GASKETS
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Genuine Kohler 32 841 02 CYLINDER HEAD GASKET KIT
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Genuine Kohler 24 318 143 KIT CYLINDER HEAD
Genuine Kohler 24 318 143 KIT CYLINDER HEAD
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Genuine Kohler 24 318 144 KIT CYLINDER HEAD
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Genuine Kohler 24 318 119 KIT CYLINDER HEAD 2
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Genuine Kohler 24 318 150 KIT CYLINDER HEAD
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271867S OEM Briggs  Stratton Cylinder Head Gasket 271867 270984 422432 422435
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Briggs  Stratton 93776 Cylinder Head Stud 691690
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KOHLER OEM CYLINDER HEAD GASKET KIT PART 24 841 01 S
KOHLER OEM CYLINDER HEAD GASKET KIT PART 24 841 01 S
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KOHLER OEM CYLINDER HEAD GASKET KIT PART 24 841 02 S
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Honda Cylinder Head Gasket GX390 13hp Engines Replacement
Honda Cylinder Head Gasket GX390 13hp Engines Replacement
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NEW LAUSON TECUMSEH GAS ENGINE CYLINDER HEAD 30579 MOWERMINI BIKEGO KART MOTOR
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36719 cylinder head gasket tecumseh Craftsman Sears
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273280S OEM Briggs  Stratton Cylinder Head Gasket 273280 272614 210702 215707
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BRIGGS AND STRATTON 692249 GASKET CYLINDER HEAD 795 FREE SHIPPING
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Lawn Mower Cylinder Head
Lawn Mower Cylinder Head
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Lawn Mower Cylinder Head
Lawn Mower Cylinder Head
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Briggs  Stratton Part 211851 Cylinder Head OEM
Briggs Stratton Part 211851 Cylinder Head OEM
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Briggs Stratton Part 212462 Cylinder Head OEM
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Briggs Stratton Part 211592 Cylinder Head OEM
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Briggs  Stratton 222357 691731 Cylinder Head Cover OEM
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Briggs  Stratton Part 211542 Cylinder Head OEM
Briggs Stratton Part 211542 Cylinder Head OEM
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briggs and stratton cylinder head 691160 sand blasted
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NEW OLD STOCK tecumseh part 30579 36438 cylinder head NEW IN THE BOX
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John Deere 318 420 316 p218 Onan Engine Cylinder heads
John Deere 318 420 316 p218 Onan Engine Cylinder heads
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John Deere 112 Tractor Tecumseh HH100 10hp Engine Cylinder Head
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M T D Model 990 16 H P Briggs And Stratton Cylinder Head 326400
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Briggs  Stratton 93776 CYLINDER HEAD STUD
Briggs Stratton 93776 CYLINDER HEAD STUD
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175hp Tecumseh Enduro XL C OHV175 Engine Cylinder Head and Push Rods
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TECUMSEH 8 hp horizontal shaft cylinder head
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Briggs Stratton 18 HP Vanguard Cylinder heads
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Yanmar 4TN82E Cylinder Head Howard Price John Deere Mustang
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Set of cylinder heads from a 22hp Briggs 407677 motor
Set of cylinder heads from a 22hp Briggs 407677 motor
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Set Of 2 John Deere 400 Garden Tractor Kohler K532 Engine Cylinder Heads
Set Of 2 John Deere 400 Garden Tractor Kohler K532 Engine Cylinder Heads
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Briggs  Stratton Craftsman 18 HP Opposed Twin Cylinder Heads Horizontal Shaft
Briggs Stratton Craftsman 18 HP Opposed Twin Cylinder Heads Horizontal Shaft
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Briggs Stratton Cylinder Head pt 212462 NEW B5
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