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 36337 Cylinder Head Gasket OHSK120 125 OHV14 165
Tecumseh 36337 Cylinder Head Gasket OHSK120 125 OHV14 165
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Briggs  Stratton 710137 Cylinder Head Gasket
Briggs Stratton 710137 Cylinder Head Gasket
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For Honda GX110 GX120 GX140 GX160  GX200 Cylinder Head Cover Assembly
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Genuine Baja WD90 329 OEM Cylinder Head Left Side Cover Gasket Dirt Runner
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Briggs  Stratton 11HP 252707 Cylinder Head 212914 691154
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Briggs and Stratton 45 Cylinder Head 590411
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422707 18HP TWIN BRIGGS  STRATTON CYLINDER HEADS
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Briggs  Stratton 11HP 252707 Cylinder Shield 224882 Cylinder Head Cover 224897
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CYLINDER HEAD GASKET FITS HONDA GX390
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KOHLER CYLINDER HEAD 24 318 13S
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Tecumseh 4HP Toro 4 21 HS40 Cylinder head GOOD SHAPE 37675 33016A 36441
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Tecumseh Engine Part  32631A CYLINDER HEAD GASKET
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HONDA GX120 4 HP CYLINDER HEAD GASKET 4HP ENGINE NEW ALSDO FITS WATER PUMPS
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Used Briggs and Stratton 8hp horizontal engine cylinder head 691715
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Onan Cylinder Heads 1561 and 1562 CCK Heads New Old Stock
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9 Original NOS Briggs  Stratton Cylinder Head Gaskets 270430
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Briggs  Stratton engine LOT OF 9 272536 cylinder head gasket GENUINE OEM
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TROY BILT MODEL 13027 ENGINE CV14S KOHLER COMMAND ENGINE CYLINDER HEAD
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TROY BILT MODEL 13027 ENGINE CV14S KOHLER COMMAND ENGINE CYLINDER HEAD BOLTS
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NEW CYLINDER HEAD GASKET 9HP HONDA GX270 GAS ENGINE
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BRIGGS  STRATTON World Formula Animal 555635 Cylinder Head LO 206 Kart Engine
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Honda GX200 65HP Piston Kit Air Filter Connecting Rod Cylinder Head Rocker Arms
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HUSKEE MODEL 136H450F131 TRACTOR CYLINDER HEAD PART NUMBER BS494240
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Honda GX240 8HP Piston Kit Connecting Rod Air Filter Cylinder Head Rocker Arms
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Honda GX270 9HP Piston Kit Air Filter Cylinder Head Connecting Rod Rocker Arms
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18HP Briggs  Stratton Vanguard 350777 cylinder heads pair 1 2 809185
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Honda GX340 11HP Connecting Rod Piston Kit Air Filter Cylinder Head Rocker Arms
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Honda GX390 13HP Piston Kit Air Filter Connecting Rod Cylinder Head Rocker Arms
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CASE 446 TRACTOR CYLINDER HEAD AIR HOUSING PART  134 4371
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CASE 446 TRACTOR RH CYLINDER HEAD PART  110 2564
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Genuine Tecumseh 36451 Cylinder Head Gasket HM HMSK LH TVM220 TVXL220 OEM
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CASE 446 TRACTOR LH CYLINDER HEAD PART  110 2563
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John Deere GT235 LX288 SST18 2 Cylinder Head Briggs AM132458 LG808384
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Briggs  Stratton 796471 Cylinder Head USED  OEM Part
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John Deere GT235 LX288 SST18 1 Cylinder Head Briggs and Straton LG808383
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Briggs  Stratton 271917 10 Cylinder Head Gaskets
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Briggs  Stratton 796479 Valve Cover Cylinder Head Cover USED  OEM Part
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New Tecumseh 2 cycle Cylinder Head 250240B
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Briggs and Stratton cylinder head 795501      JSE
Briggs and Stratton cylinder head 795501 JSE
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Honda GX160 55HP Rockers Cylinder Head Kit Inlet  Exhaust Valves Head Gasket
Honda GX160 55HP Rockers Cylinder Head Kit Inlet Exhaust Valves Head Gasket
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New Honda GX240 8HP Rockers Cylinder Head Kit Inlet  Exhaust Valves Head Gasket
New Honda GX240 8HP Rockers Cylinder Head Kit Inlet Exhaust Valves Head Gasket
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New Honda GX270 9HP Rockers Cylinder Head Kit Inlet  Exhaust Valves Head Gasket
New Honda GX270 9HP Rockers Cylinder Head Kit Inlet Exhaust Valves Head Gasket
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New Honda GX340 11HP Rocker Cylinder Head Kit Inlet  Exhaust Valves Head Gasket
New Honda GX340 11HP Rocker Cylinder Head Kit Inlet Exhaust Valves Head Gasket
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New Honda GX390 13HP Rocker Cylinder Head Kit Inlet  Exhaust Valves Head Gasket
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Cylinder Head Gasket Tecumseh 34041 33270 34923 Sears 465450 Replacement 2762
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GENUINE Briggs  Stratton 694872 Cylinder Head Gasket
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John Deere Cylinder Head FD590V Kawasaki 285 320 345 M140540 AM105551
John Deere Cylinder Head FD590V Kawasaki 285 320 345 M140540 AM105551
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John Deere LA130 Lawn Tractor Cylinder Head Part  MIA10846
John Deere LA130 Lawn Tractor Cylinder Head Part MIA10846
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Genuine Briggs  Stratton 692249 Cylinder Head Gasket OEM
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Briggs  Stratton Gasket Cylinder Head 270340
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Briggs and Stratton cylinder head 213955 213012    JSE
Briggs and Stratton cylinder head 213955 213012 JSE
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Ariens 924039 Snow Blower Cylinder Head Part  34030B
Ariens 924039 Snow Blower Cylinder Head Part 34030B
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CYLINDER HEAD GASKET FOR BS REPLACES OEM 273280S 273280 272614
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OEM BRIGGS CYLINDER HEAD PART 796231
OEM BRIGGS CYLINDER HEAD PART 796231
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Kohler M18 Cylinder Heads
Kohler M18 Cylinder Heads
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Ingersoll 4020 Tractor 20hp Onan Engine P220 Cylinder Heads
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BS 12HP 281707 Set of 2 Tins Cylinder Head Cover  Cylinder Shield Cover
BS 12HP 281707 Set of 2 Tins Cylinder Head Cover Cylinder Shield Cover
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Genuine Briggs  Stratton 698717 Cylinder Head Gasket 272536 272170 270341 OEM
Genuine Briggs Stratton 698717 Cylinder Head Gasket 272536 272170 270341 OEM
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Genuine Tecumseh 37714 Cylinder Head LEV105 LEV120 LV195EA OEM
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Genuine Kohler 24 841 01 S Cylinder Head Gasket Kit Command CH CV OEM
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Briggs  Stratton 809200 Cylinder Head 1 Vanguard Series USED  OEM Part
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JD Lt 155 bagger cylinder head Kohler Command JohnDeere 155
JD Lt 155 bagger cylinder head Kohler Command JohnDeere 155
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Genuine Honda 12310 Z0J 000 Cylinder Head Cover GC135 GC160 GC190 GCV135 GCV160
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Tecumseh Blower Cylinder Head Part  34335 3 HP Engine TVS90
Tecumseh Blower Cylinder Head Part 34335 3 HP Engine TVS90
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WHEEL HORSE 518H ONAN P218G LEFT SIDE CYLINDER HEAD 71 5810 NN10079
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John Deere 317 Kohler KT17 Cylinder Heads M83543
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Lot of 3 36229 Tecumseh TVS100 120 115 Cylinder Head Gasket NOS 704805 36443
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Tecumseh 34041 Cylinder Head Gasket 34923A GENUINE
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Briggs  Stratton 791716 Cylinder Head Gasket Replacement Part
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Genuine OEM Kawasaki Part 11008 7020 CYLINDER HEAD 2
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Genuine OEM Kawasaki Part 11008 6043 HEAD COMP CYLINDER1
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Genuine OEM Kawasaki Part 11008 7022 CYLINDER HEAD 1
Genuine OEM Kawasaki Part 11008 7022 CYLINDER HEAD 1
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