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.

Briggs  Stratton 796232 Cylinder Head Replaces 796633 792300 697581 693999
Briggs Stratton 796232 Cylinder Head Replaces 796633 792300 697581 693999
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Cub Cadet Briggs  Stratton 17 HP OHV Lawn Tractor Engine Cylinder Head
Cub Cadet Briggs Stratton 17 HP OHV Lawn Tractor Engine Cylinder Head
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Genuine Briggs  Stratton Part Number 796584 Cylinder Head Gasket
Genuine Briggs Stratton Part Number 796584 Cylinder Head Gasket
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Cylinder Head Gasket Briggs 272614 273280 273280S
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Briggs  Stratton 5HP 206cc 132252 Cylinder head NLA GOODSHAPE 211542
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Briggs  Stratton 132922 engine cylinder head
Briggs Stratton 132922 engine cylinder head
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TORO 22 14O501 244 5 YARD TRACTOR 1991 CYLINDER HEAD PART  BS796026
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NEW Briggs  Stratton Cylinder Head Gasket Part 272314
NEW Briggs Stratton Cylinder Head Gasket Part 272314
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New Briggs Stratton Cylinder Head Screw 690904 BS 24
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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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BRIGGS AND STRATTON 796473 GASKET CYLINDER HEAD
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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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MTD Cylinder Head 951 11746
MTD Cylinder Head 951 11746
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Briggs  Stratton 20HP Engine Cylinder Head
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JOHN DEERE GT262 CYLINDER HEAD PART AM109087
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NEW Honda GX390 13 HP CYLINDER HEAD GASKET 13HP ENGINE
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NOS Tecumseh Cylinder Head Part  36474
NOS Tecumseh Cylinder Head Part 36474
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BRIGGS STRATTON CYLINDER HEAD 799533
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BRIGGS CYLINDER HEAD GASKET PART 694872
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Briggs and Stratton Cylinder Head
Briggs and Stratton Cylinder Head
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tecumseh cylinder head part 37675
tecumseh cylinder head part 37675
$5.00
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Tecumseh Cylinder Head 37675
Tecumseh Cylinder Head 37675
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Kohler 24 841 03 S Cylinder Head Gasket Kit 2484103S 2484104s 24 841 04 s
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Cub Cadet 1100 Tractor Briggs Stratton 253417 11hp Engine Cylinder Head
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SABRE BY JOHN DEERE 145 38 HYDRO CYLINDER HEAD PART  LG691165
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699482 Bolt Cylinder Head 8mm x 66mm 1213 CID OHV Models Briggs OEM New
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Briggs  Stratton 132922 engine cylinder head bolts
Briggs Stratton 132922 engine cylinder head bolts
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John Deere LX279 Right Cylinder Head 17hp Kawisaki
John Deere LX279 Right Cylinder Head 17hp Kawisaki
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3hp Tecumseh Small Engine Cylinder Head
3hp Tecumseh Small Engine Cylinder Head
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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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P094 Stihl TS400 Cylinder  Piston Rebuild Kit with Rings Head Gasket Spark Plug
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OEM 32246 32246B head cylinder gasket Tecumseh Sears
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OEM TECUMSEH CYLINDER HEAD GASKET PART 35306A
OEM TECUMSEH CYLINDER HEAD GASKET PART 35306A
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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 796232 CYLINDER HEAD
BRIGGS AND STRATTON 796232 CYLINDER HEAD
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Briggs and stratton 4 hp cylinder head
Briggs and stratton 4 hp cylinder head
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Kohler K482532582 Engine Cylinder Heads reconditioned
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Briggs and Stratton 5hp Vertical Shaft Cylinder Head Cover 221452
Briggs and Stratton 5hp Vertical Shaft Cylinder Head Cover 221452
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Briggs  Stratton Cylinder Head Gasket 272167
Briggs Stratton Cylinder Head Gasket 272167
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CYLINDER HEAD Yanmar 3TN84 John Deere 870 955 Engine Takeuchi TB035
CYLINDER HEAD Yanmar 3TN84 John Deere 870 955 Engine Takeuchi TB035
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Oregon 50 445 Cylinder Head Gasket Replacement for Briggs  Stratton 698717
Oregon 50 445 Cylinder Head Gasket Replacement for Briggs Stratton 698717
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Briggs  Stratton 271917 Cylinder Head Gasket
Briggs Stratton 271917 Cylinder Head Gasket
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Cub Cadet 782 Tractor Kohler KT 17 17hp Engine Cylinder Heads
Cub Cadet 782 Tractor Kohler KT 17 17hp Engine Cylinder Heads
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wheelhorse wheel horse kohler k141 161 181 head and cylinder shield cover tin
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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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John Deere 2243 Mower FD590V 18hp Engine Cylinder Heads
John Deere 2243 Mower FD590V 18hp Engine 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 STRATTON CYLINDER HEAD PLATE GASKET 694088
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Cylinder Head Gasket Briggs  Stratton 272167
Cylinder Head Gasket Briggs Stratton 272167
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Cub Cadet 1015 1020 Briggs and Stratton 10hp Cylinder Head Shroud 224897
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Cub Cadet 1015 1020 Briggs and Stratton 10hp Cylinder Head 212914
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Briggs Stratton 272200 Cylinder Head Gasket Genuine OEM
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Wheel Horse C 175 Tractor Kohler KT17S 17hp Engine Cylinder Heads
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Briggs  Stratton Model 6 engine cylinder head bolts
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BRIGGS  STRATTON MODEL 286707 0437 01 125HP USED CYLINDER HEAD COVER
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BRIGGS STRATTON CYLINDER HEAD GASKET 272200 FITS MANY
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Genuine Briggs  Stratton Head Cylinder Gasket Part  272163S Lawn Mower Parts
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Kohler Command 15hp CV15S Cylinder Head 13 14 15 16
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JOHN DEERE LX288 2WS CYLINDER HEAD 1 COVER PART  M152462
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Case 446 Onan BF MS Crankcase cylinder Head LH 1 C20258 170 2919
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