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.

ROBIN SUBARU OEM 263 15021 41 GASKET 1 CYLINDER HEADOEM ORIGINAL EQUIPMENT MFG
ROBIN SUBARU OEM 263 15021 41 GASKET 1 CYLINDER HEADOEM ORIGINAL EQUIPMENT MFG
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ROBIN SUBARU OEM 263 15101 13 GASKET 2 CYLINDER HEAD 2OEM ORIGINAL EQ MFG
ROBIN SUBARU OEM 263 15101 13 GASKET 2 CYLINDER HEAD 2OEM ORIGINAL EQ MFG
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Genuine Kohler 12 755 101 S Cylinder Head Kit OEM NEW
Genuine Kohler 12 755 101 S Cylinder Head Kit OEM NEW
$229.99
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Genuine Kohler 12 318 50 S Cylinder Head OEM NEW
Genuine Kohler 12 318 50 S Cylinder Head OEM NEW
$159.99
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BRIGGS AND STRATTON 796232 CYLINDER HEAD OEM NEW
BRIGGS AND STRATTON 796232 CYLINDER HEAD OEM NEW
$117.95
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JOHN DEERE 1980 400 KOHLER K532 ENGINE CYLINDER HEADS BOTH GREAT CONDITION
JOHN DEERE 1980 400 KOHLER K532 ENGINE CYLINDER HEADS BOTH GREAT CONDITION
$60.00
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Qty 4  93368 Genuine Briggs  Stratton Cylinder Head Bolts 2 3 32
Qty 4 93368 Genuine Briggs Stratton Cylinder Head Bolts 2 3 32
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KOHLER 32 318 14 5 2 CYLINDER HEAD ASSEMBLY
KOHLER 32 318 14 5 2 CYLINDER HEAD ASSEMBLY
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Briggs  Stratton 271866S GASKET CYLINDER HEAD OEM
Briggs Stratton 271866S GASKET CYLINDER HEAD OEM
$15.99
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New OEM Briggs  Stratton Cylinder Head ASM 796471 Models 11P902 111P02 112P02
New OEM Briggs Stratton Cylinder Head ASM 796471 Models 11P902 111P02 112P02
$86.18
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1959 Vintage Briggs and Stratton CYLINDER HEAD 210812 w bolts
1959 Vintage Briggs and Stratton CYLINDER HEAD 210812 w bolts
$25.00
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KAWASAKI CYLINDER HEAD 11001 2151 110012151 MOWERS GENERATORS SMALL ENGINES
KAWASAKI CYLINDER HEAD 11001 2151 110012151 MOWERS GENERATORS SMALL ENGINES
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Tecumseh Cylinder Head Gasket 35617 Models OVRM40 OVRM55 OVRM50
Tecumseh Cylinder Head Gasket 35617 Models OVRM40 OVRM55 OVRM50
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BS 12HP I C 281707 Set of 3 Tins Cylinder Head Cylinder Shield Flywheel Guard
BS 12HP I C 281707 Set of 3 Tins Cylinder Head Cylinder Shield Flywheel Guard
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Cylinder Head for Honda GX240 GX270 1200 ZH9 405 12200 ZH9 000
Cylinder Head for Honda GX240 GX270 1200 ZH9 405 12200 ZH9 000
$130.12
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Briggs  Stratton Set of Cylinder Head Screws 690360 Intek 175HP OHV G42AH
Briggs Stratton Set of Cylinder Head Screws 690360 Intek 175HP OHV G42AH
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36438 TECUMSEH CYLINDER HEAD VINTAGE
36438 TECUMSEH CYLINDER HEAD VINTAGE
$19.99
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Briggs  Stratton 12HP I C 281707 Cylinder Head
Briggs Stratton 12HP I C 281707 Cylinder Head
$20.00
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Briggs opposed twin cylinder head 42 cubic inch 422400  422700
Briggs opposed twin cylinder head 42 cubic inch 422400 422700
$12.99 (2 Bids)
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Briggs and Stratton 693997 Cylinder Head gasket genuine OEM brand new
Briggs and Stratton 693997 Cylinder Head gasket genuine OEM brand new
$9.50
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BRIGGS AND STRATTON 590411 CYLINDER HEAD LOT OF 5 NEW W FREE SHIPPING
BRIGGS AND STRATTON 590411 CYLINDER HEAD LOT OF 5 NEW W FREE SHIPPING
$30.00
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Briggs  Stratton 18 HP Opposed Twin Engine Cylinder Heads
Briggs Stratton 18 HP Opposed Twin Engine Cylinder Heads
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Kohler Cylinder Head Gasket 24 841 01 24 841 01 s Kit
Kohler Cylinder Head Gasket 24 841 01 24 841 01 s Kit
$23.99
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Tecumseh 510274 Cylinder Head Gasket 510274A
Tecumseh 510274 Cylinder Head Gasket 510274A
$3.39
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JACOBSEN 1650 HYDRO UT53332 GARDEN TRACTOR CYLINDER HEAD PART  KH45 015 09 S
JACOBSEN 1650 HYDRO UT53332 GARDEN TRACTOR CYLINDER HEAD PART KH45 015 09 S
$121.88
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BRIGGS  STRATTON Mod 12H802 2684 B1 CYLINDER HEAD Part 691160
BRIGGS STRATTON Mod 12H802 2684 B1 CYLINDER HEAD Part 691160
$16.95
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Homelite BC800 Trimmer Weed Eater Cylinder Head
Homelite BC800 Trimmer Weed Eater Cylinder Head
$14.99
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Cylinder Head Tecumseh 36488 37495 Push Rods 36340 OHV155 204509E
Cylinder Head Tecumseh 36488 37495 Push Rods 36340 OHV155 204509E
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HONDA HR215 HR 215 LAWN MOWER CYLINDER HEAD VALVE ROCKER COVER
HONDA HR215 HR 215 LAWN MOWER CYLINDER HEAD VALVE ROCKER COVER
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Briggs  Stratton OEM Cylinder Head Gasket 271866S 271866 New OD
Briggs Stratton OEM Cylinder Head Gasket 271866S 271866 New OD
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Homelite UT08085 Vac Attack 25cc Blower Cylinder Head
Homelite UT08085 Vac Attack 25cc Blower Cylinder Head
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HONDA HR215 HR 215 LAWN MOWER CYLINDER HEAD WITH VALVES
HONDA HR215 HR 215 LAWN MOWER CYLINDER HEAD WITH VALVES
$24.00
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Onan 18HP John Deere 317 P218G Cylinder head LH  RH PAIR set GOOD SHAPE
Onan 18HP John Deere 317 P218G Cylinder head LH RH PAIR set GOOD SHAPE
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HONDA HR215 HR 215 LAWN MOWER CYLINDER HEAD BOLTS
HONDA HR215 HR 215 LAWN MOWER CYLINDER HEAD BOLTS
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Briggs  stratton Cylinder Head 691165
Briggs stratton Cylinder Head 691165
$50.00
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McCulloch MAC 2818 Trimmer Weed Eater Piston Cylinder Head
McCulloch MAC 2818 Trimmer Weed Eater Piston Cylinder Head
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STIHL FS45C 27cc Trimmer Weed Eater OEM Cylinder Head
STIHL FS45C 27cc Trimmer Weed Eater OEM Cylinder Head
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KOHLER OEM CYLINDER HEAD GASKET KIT PART 24 841 02 S
KOHLER OEM CYLINDER HEAD GASKET KIT PART 24 841 02 S
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Briggs  Stratton 18HP Twin Cylinder 422707 Engine Head Bolts
Briggs Stratton 18HP Twin Cylinder 422707 Engine Head Bolts
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Husqvarna 322L 22cc Trimmer Weed Eater Cylinder Head
Husqvarna 322L 22cc Trimmer Weed Eater Cylinder Head
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BRIGGS  STRATTON 13D137 CYLINDER HEAD W SCREWS P N 591454 590639
BRIGGS STRATTON 13D137 CYLINDER HEAD W SCREWS P N 591454 590639
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Briggs  Stratton 18HP Twin Cylinder 422707 Engine 2 Head Bolts
Briggs Stratton 18HP Twin Cylinder 422707 Engine 2 Head Bolts
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Briggs and Stratton 494240 Cylinder Head
Briggs and Stratton 494240 Cylinder Head
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Briggs  Stratton 18HP Twin Cylinder 422707 Engine Set of Heads
Briggs Stratton 18HP Twin Cylinder 422707 Engine Set of Heads
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Tecumseh 125 hp Cylinder head assembly  37469 Replaced  36933 OHV125 XL C
Tecumseh 125 hp Cylinder head assembly 37469 Replaced 36933 OHV125 XL C
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TECUMSEH CYLINDER HEAD WT1307 PART NUMBER TC33034
TECUMSEH CYLINDER HEAD WT1307 PART NUMBER TC33034
$72.18
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Kohler OEM Cylinder Head Gasket 6304125 S NEW RP
Kohler OEM Cylinder Head Gasket 6304125 S NEW RP
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Craftsman Weedwacker 32cc 358791580 Trimmer Weed Eater Piston Cylinder Head
Craftsman Weedwacker 32cc 358791580 Trimmer Weed Eater Piston Cylinder Head
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Weed Eater Excalibur 22 GHT 225 Hedge Trimmer Piston Cylinder Head
Weed Eater Excalibur 22 GHT 225 Hedge Trimmer Piston Cylinder Head
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Tecumseh Cylinder Head Gasket 33015A FOR TORO SNOW BLOWERS  MOWERS
Tecumseh Cylinder Head Gasket 33015A FOR TORO SNOW BLOWERS MOWERS
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Weed Eater Super Vac 24cc WPWES Blower Piston Cylinder Head
Weed Eater Super Vac 24cc WPWES Blower Piston Cylinder Head
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Briggs and Stratton twin CYLINDER HEAD  2 493458
Briggs and Stratton twin CYLINDER HEAD 2 493458
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Homelite XL Model XL Chainsaw Cylinder Head
Homelite XL Model XL Chainsaw Cylinder Head
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Briggs  Stratton 5HP 130202 Engine Cylinder head with bolts
Briggs Stratton 5HP 130202 Engine Cylinder head with bolts
$22.00
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Briggs  Stratton 125HP I C Engine single Cylinder head
Briggs Stratton 125HP I C Engine single Cylinder head
$29.95
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Briggs  Stratton Opposed Twin II I C CYLINDER HEAD SET 17HP 18HP 185 HP
Briggs Stratton Opposed Twin II I C CYLINDER HEAD SET 17HP 18HP 185 HP
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Briggs  Stratton Opposed Twin II I C cylinder head bolts 17HP 18HP 185 HP
Briggs Stratton Opposed Twin II I C cylinder head bolts 17HP 18HP 185 HP
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Onan 16HP Case 446 BF MS 3264F Cylinder head LH 1 GOOD SHAPE C
Onan 16HP Case 446 BF MS 3264F Cylinder head LH 1 GOOD SHAPE C
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Kawasaki 15HP OHV FD501V CS00 Engine Cylinder head assembly 11008 2143
Kawasaki 15HP OHV FD501V CS00 Engine Cylinder head assembly 11008 2143
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Cylinder Head Gasket Replacement For Models And Old Briggs 692249
Cylinder Head Gasket Replacement For Models And Old Briggs 692249
$9.11
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Cylinder Head Gasket 794114
Cylinder Head Gasket 794114
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Cylinder Head Gasket Replacement For Models And Old Briggs 698717
Cylinder Head Gasket Replacement For Models And Old Briggs 698717
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24 318 108 S Kohler 1 Cylinder Head Assembly CV730 CV740
24 318 108 S Kohler 1 Cylinder Head Assembly CV730 CV740
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24 318 114 S KOHLER 2 CYLINDER HEAD KIT 24 318 66 S CH23 CH25 CH730 CH740 CH745
24 318 114 S KOHLER 2 CYLINDER HEAD KIT 24 318 66 S CH23 CH25 CH730 CH740 CH745
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790169 BRIGGS AND STRATTON CYLINDER HEAD USED FITS 3HP SIDE SHAFT ENGINE 91212
790169 BRIGGS AND STRATTON CYLINDER HEAD USED FITS 3HP SIDE SHAFT ENGINE 91212
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Kawasaki 17hp FC540V Muffler To Cylinder Head Mount Nuts and Spacers
Kawasaki 17hp FC540V Muffler To Cylinder Head Mount Nuts and Spacers
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1991 Arctic Cat Wildcat 700 cc Suzuki Cylinder Heads and Jugs
1991 Arctic Cat Wildcat 700 cc Suzuki Cylinder Heads and Jugs
$299.95
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Sears Craftsman Tecumseh Mower Cylinder Head Used In Good Condition 36187
Sears Craftsman Tecumseh Mower Cylinder Head Used In Good Condition 36187
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Tecumseh Engine Part  32951 Cylinder Head
Tecumseh Engine Part 32951 Cylinder Head
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Briggs and Stratton 796584 Cylinder Head gasket 272475 rocker gasket combo
Briggs and Stratton 796584 Cylinder Head gasket 272475 rocker gasket combo
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HONDA GX620 CYLINDER HEADS 12210 ZJ1 405 12220 ZJ1 U80
HONDA GX620 CYLINDER HEADS 12210 ZJ1 405 12220 ZJ1 U80
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Onan B48G Cylinder Head 170 3797 Right
Onan B48G Cylinder Head 170 3797 Right
$22.00
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Onan B48G Cylinder Head 170 3796 LEFT side
Onan B48G Cylinder Head 170 3796 LEFT side
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Briggs  Stratton 8HP 192437 Cylinder head 691715
Briggs Stratton 8HP 192437 Cylinder head 691715
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BRIGGS  STRATTON CYLINDER HEAD PLATE GASKET 694088
BRIGGS STRATTON CYLINDER HEAD PLATE GASKET 694088
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Cub Cadet HDS 2155 Tractor Kohler Command CH15S 15hp Engine Cylinder Head
Cub Cadet HDS 2155 Tractor Kohler Command CH15S 15hp Engine Cylinder Head
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