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 Cylinder Head Gasket 32643A Models HS40 ECV105 ECV100 LAV40
Tecumseh Cylinder Head Gasket 32643A Models HS40 ECV105 ECV100 LAV40
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Briggs  Stratton Craftsman 18 HP Opposed Twin II Cylinder Heads
Briggs Stratton Craftsman 18 HP Opposed Twin II Cylinder Heads
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Genuine Tecumseh 37028 Cylinder Head Gasket OEM
Genuine Tecumseh 37028 Cylinder Head Gasket OEM
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Briggs and Stratton 5HP Engine Cylinder Head Horizontal Model 130202 Part 211542
Briggs and Stratton 5HP Engine Cylinder Head Horizontal Model 130202 Part 211542
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Briggs  Stratton 5HP 206cc 132252 Cylinder head NLA GOODSHAPE 211542
Briggs Stratton 5HP 206cc 132252 Cylinder head NLA GOODSHAPE 211542
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Used Cylinder Head 17hp Kohler KT17 Simplicity 7117 Garden Tractor
Used Cylinder Head 17hp Kohler KT17 Simplicity 7117 Garden Tractor
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Briggs  Stratton 10J902 0139 E1 Cylinder Head 790169
Briggs Stratton 10J902 0139 E1 Cylinder Head 790169
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Briggs  Stratton 132922 engine cylinder head
Briggs Stratton 132922 engine cylinder head
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NEW Briggs  Stratton Cylinder Head Gasket Part 272314
NEW Briggs Stratton Cylinder Head Gasket Part 272314
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john deere lx188 kawasaki 17hp 17 hp cylinder head w bolts  rods OEM
john deere lx188 kawasaki 17hp 17 hp cylinder head w bolts rods OEM
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NEW Left and Right Cylinder Heads FITS Honda GX620 20 HP V Twin Gas Engines
NEW Left and Right Cylinder Heads FITS Honda GX620 20 HP V Twin Gas Engines
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Lot of 2 Briggs and Stratton Part 27463 Gasket Cylinder Head
Lot of 2 Briggs and Stratton Part 27463 Gasket Cylinder Head
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Cub Cadet 2146  ELITE Cylinder Head ONAN SHIPS US 48 STATES
Cub Cadet 2146 ELITE Cylinder Head ONAN SHIPS US 48 STATES
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Clinton Engine Part 122 4 Cylinder Head
Clinton Engine Part 122 4 Cylinder Head
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Briggs and Stratton Cylinder Head 693999 Intek Twin Fits Many
Briggs and Stratton Cylinder Head 693999 Intek Twin Fits Many
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Yard Machines 179cc OHV 365 SUA Cylinder head assembly GREATSHAPE N A
Yard Machines 179cc OHV 365 SUA Cylinder head assembly GREATSHAPE N A
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Yard Machines 208cc OHV 370 SUB Cylinder head assembly GREATSHAPE N A
Yard Machines 208cc OHV 370 SUB Cylinder head assembly GREATSHAPE N A
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809276 Vanguard 2 L C cylinder Head  1 complete
809276 Vanguard 2 L C cylinder Head 1 complete
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Briggs and Stratton Cylinder Head 693998 Intek Twin Fits Many
Briggs and Stratton Cylinder Head 693998 Intek Twin Fits Many
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Genuine OEM Kohler Cylinder Head Gasket Part  12 041 10 S 12 041 10 S 1204110 S
Genuine OEM Kohler Cylinder Head Gasket Part 12 041 10 S 12 041 10 S 1204110 S
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NEW Honda GX390 13 HP CYLINDER HEAD GASKET 13HP ENGINE
NEW Honda GX390 13 HP CYLINDER HEAD GASKET 13HP ENGINE
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GASKET SET STIHL 050 051 TS510 CYLINDER HEAD BASE INTAKE  MUFFLER GASKETS
GASKET SET STIHL 050 051 TS510 CYLINDER HEAD BASE INTAKE MUFFLER GASKETS
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JOHN DEERE F930 lawn mower onan T260G P224G engine cylinder head FREE SHIPPING
JOHN DEERE F930 lawn mower onan T260G P224G engine cylinder head FREE SHIPPING
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JOHN DEERE F930 lawn mower onan T260G P224G engine cylinder head FREE SHIPPING
JOHN DEERE F930 lawn mower onan T260G P224G engine cylinder head FREE SHIPPING
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237670 S GENUINE OEM KOHLER CYLINDER HEAD 237670 K301 K321
237670 S GENUINE OEM KOHLER CYLINDER HEAD 237670 K301 K321
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GASKET SET STIHL 075 076 TS760 CYLINDER HEAD BASE INTAKE  MUFFLER GASKETS
GASKET SET STIHL 075 076 TS760 CYLINDER HEAD BASE INTAKE MUFFLER GASKETS
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Kohler 24 841 03 S Cylinder Head Gasket Kit 2484103S 2484104s 24 841 04 s
Kohler 24 841 03 S Cylinder Head Gasket Kit 2484103S 2484104s 24 841 04 s
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Briggs  Stratton 132922 engine cylinder head bolts
Briggs Stratton 132922 engine cylinder head bolts
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1965 CASE Colt Super H Tractor Kohler K241 10hp Engine Cylinder Head high boss
1965 CASE Colt Super H Tractor Kohler K241 10hp Engine Cylinder Head high boss
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Briggs  Stratton Twin Cylinder Head 2 493458Craftsman TroyBuilt MTD
Briggs Stratton Twin Cylinder Head 2 493458Craftsman TroyBuilt MTD
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Briggs  Stratton OHV 445777 Engine Cylinder Head assembly 796231 214612 1
Briggs Stratton OHV 445777 Engine Cylinder Head assembly 796231 214612 1
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Onan 24HP John Deere F930 T260G GA024 Cylinder head GOODSHAPE 170 3562 110 3549
Onan 24HP John Deere F930 T260G GA024 Cylinder head GOODSHAPE 170 3562 110 3549
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1 Pack of 8 Briggs  Stratton Cylinder Head Gasket 270383
1 Pack of 8 Briggs Stratton Cylinder Head Gasket 270383
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Kawasaki FD731V Liq Cooled Engine Cylinder Head Kawasaki Part 11008 2163
Kawasaki FD731V Liq Cooled Engine Cylinder Head Kawasaki Part 11008 2163
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P094 Stihl TS400 Cylinder  Piston Rebuild Kit with Rings Head Gasket Spark Plug
P094 Stihl TS400 Cylinder Piston Rebuild Kit with Rings Head Gasket Spark Plug
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Used Tecumseh engine LE195SP Cylinder head 37675 OEM
Used Tecumseh engine LE195SP Cylinder head 37675 OEM
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Used Briggs and Stratton 8hp horizontal engine cylinder head 691715
Used Briggs and Stratton 8hp horizontal engine cylinder head 691715
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OEM 32246 32246B head cylinder gasket Tecumseh Sears
OEM 32246 32246B head cylinder gasket Tecumseh Sears
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tecumseh cylinder head part 37675
tecumseh cylinder head part 37675
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Tecumseh Cylinder Head 37675
Tecumseh Cylinder Head 37675
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CYLINDER HEAD GASKET COVER HONDA 12391 ZE2 020
CYLINDER HEAD GASKET COVER HONDA 12391 ZE2 020
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Onan Diesel cylinder head DJC Air cooled parts
Onan Diesel cylinder head DJC Air cooled parts
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Kohler Magnum 17 Cylinder Head KH 52 015 08 MV18S Cub Cadet 1730 1
Kohler Magnum 17 Cylinder Head KH 52 015 08 MV18S Cub Cadet 1730 1
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Briggs  Stratton 18 HP Vanguard Cylinder heads
Briggs Stratton 18 HP Vanguard Cylinder heads
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CYLINDER HEAD GASKET FITS HONDA ENGINE G100 25CC
CYLINDER HEAD GASKET FITS HONDA ENGINE G100 25CC
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Briggs 271917 Cylinder Head Gasket fits Quantum 100700 Series NOS
Briggs 271917 Cylinder Head Gasket fits Quantum 100700 Series NOS
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Briggs  stratton 18hp vertical shaft 2 Cylinder head 809186
Briggs stratton 18hp vertical shaft 2 Cylinder head 809186
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Kohler K482532582 Engine Cylinder Heads reconditioned
Kohler K482532582 Engine Cylinder Heads reconditioned
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USED BRIGGS CYLINDER HEAD  2 205 20 HP 691163
USED BRIGGS CYLINDER HEAD 2 205 20 HP 691163
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USED BRIGGS CYLINDER HEAD  1 205 20 HP 691162
USED BRIGGS CYLINDER HEAD 1 205 20 HP 691162
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ONAN Marquis 7000 Generator NH Cylinder Head
ONAN Marquis 7000 Generator NH Cylinder Head
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Briggs and stratton 3 HP Head cylinder head
Briggs and stratton 3 HP Head cylinder head
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Briggs  Stratton Cylinder Head Gasket 272167
Briggs Stratton Cylinder Head Gasket 272167
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18hp 20hp Kohler CH18 CH20 cylinder head number 2
18hp 20hp Kohler CH18 CH20 cylinder head number 2
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Briggs  Stratton 271917 Cylinder Head Gasket
Briggs Stratton 271917 Cylinder Head Gasket
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Briggs  Stratton 155 hp 282H07 Cylinder Head Bolts 690360 before code 07011000
Briggs Stratton 155 hp 282H07 Cylinder Head Bolts 690360 before code 07011000
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Briggs and Stratton 11 hp 690491 Cylinder Head Cover replaces 224897 253707
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Briggs and Stratton 11 hp Engine Cylinder Head Bolts
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Briggs Stratton 10 hp 256707 Vertical Shaft Cylinder Head Cover 690491 224897
Briggs Stratton 10 hp 256707 Vertical Shaft Cylinder Head Cover 690491 224897
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VINTAGE 75HP WISCONSIN S 7D CYLINDER HEAD
VINTAGE 75HP WISCONSIN S 7D CYLINDER HEAD
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Toro Wheel Horse John Deere Onan P218G P220G Right Hand Cylinder Head 110 3509
Toro Wheel Horse John Deere Onan P218G P220G Right Hand Cylinder Head 110 3509
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Cylinder Head Gasket For Briggs  Stratton 692249 272916 Graphite Reinforced
Cylinder Head Gasket For Briggs Stratton 692249 272916 Graphite Reinforced
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Briggs head 790169 Briggs cylinder head Sears head 475 HP Cylinder Head
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OEM ROBIN SUBARU 279 15001 23 279 15001 33 CYLINDER HEAD GASKET OEM
OEM ROBIN SUBARU 279 15001 23 279 15001 33 CYLINDER HEAD GASKET OEM
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Wheel Horse C 175 Tractor Kohler KT17S 17hp Engine Cylinder Heads
Wheel Horse C 175 Tractor Kohler KT17S 17hp Engine Cylinder Heads
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NEW Kawasaki Cylinder Head Kit pt 99999 0331 for All FX921V And FXT00V engines
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Cylinder Head Gasket Briggs 805111 807986 290400
Cylinder Head Gasket Briggs 805111 807986 290400
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Cylinder Head Assem for 175 HP Tecum Engine reduced
Cylinder Head Assem for 175 HP Tecum Engine reduced
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Briggs  Stratton engine LOT OF 7 270273 cylinder head gasket closeout
Briggs Stratton engine LOT OF 7 270273 cylinder head gasket closeout
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Briggs  Stratton Model 6 engine cylinder head bolts
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1Briggs Cylinder Head Part  691160
1Briggs Cylinder Head Part 691160
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BRIGGS  STRATTON CYLINDER HEAD GASKET 272200 FITS MANY
BRIGGS STRATTON CYLINDER HEAD GASKET 272200 FITS MANY
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Kawasaki FB460V cylinder head
Kawasaki FB460V cylinder head
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