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.

Genuine Baja WD90 329 OEM Cylinder Head Left Side Cover Gasket Dirt Runner
Genuine Baja WD90 329 OEM Cylinder Head Left Side Cover Gasket Dirt Runner
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kohler 12 755 58 cylinder head kit
kohler 12 755 58 cylinder head kit
$100.00
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Briggs  Stratton 11HP 252707 Cylinder Head 212914 691154
Briggs Stratton 11HP 252707 Cylinder Head 212914 691154
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Genuine Tecumseh 35306A Cylinder Head Gasket OHM120 OHSK120 OVRM120 OVXL120 OEM
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Kawasaki Cylinder Head 11008 2145
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$200.00
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Briggs and Stratton 45 Cylinder Head 590411
Briggs and Stratton 45 Cylinder Head 590411
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422707 18HP TWIN BRIGGS  STRATTON CYLINDER HEADS
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GENUINE NOS ONAN CYLINDER HEADS 110 3213 L  110 3214 R John Deere 316318420
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Vintage Clinton Engine Cylinder Head Excellent condition Unknown model
Vintage Clinton Engine Cylinder Head Excellent condition Unknown model
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17  18 HP Opposed Twin Cylinder Briggs  Stratton Heads Used
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$20.00
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Briggs  Stratton 11HP 252707 Set of 2 Tins Cylinder Shield Cylinder Head Cover
Briggs Stratton 11HP 252707 Set of 2 Tins Cylinder Shield Cylinder Head Cover
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CYLINDER HEAD GASKET FITS HONDA GX390
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CYLINDER HEAD GASKET FITS HONDA GX270
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BRIGGS 801283 CYLINDER HEAD
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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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OEM TECUMSEH CYLINDER HEAD GASKET PART 29953C
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OEM TECUMSEH CYLINDER HEAD GASKET PART 31923
OEM TECUMSEH CYLINDER HEAD GASKET PART 31923
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OEM TECUMSEH CYLINDER HEAD GASKET PART 36738
OEM TECUMSEH CYLINDER HEAD GASKET PART 36738
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OEM TECUMSEH CYLINDER HEAD GASKET PART 32643
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OEM TECUMSEH CYLINDER HEAD GASKET PART 34923A
OEM TECUMSEH CYLINDER HEAD GASKET PART 34923A
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1541 Cub Cadet Kohler 15HP Magnum Cylinder Heads
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9 Original NOS Briggs  Stratton Cylinder Head Gaskets 270430
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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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Honda GX200 65HP Piston Kit Air Filter Connecting Rod Cylinder Head Rocker Arms
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Sears Utility Lightweight by Orline Chainsaw OEM Piston Cylinder Head
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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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NEW OEM BRIGGS  STRATTON 4122 CYLINDER HEAD GASKET PACK OF 5 272200S
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Kohler Diesel Lombardini Ruggerini Rd952 CYLINDER HEAD
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OEM TECUMSEH CYLINDER HEAD GASKET PART 32631A
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Honda GX270 9HP Piston Kit Air Filter Cylinder Head Connecting Rod Rocker Arms
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Honda GX340 11HP Connecting Rod Piston Kit Air Filter Cylinder Head Rocker Arms
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OEM TECUMSEH CYLINDER HEAD GASKET PART 33015A
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NEW OEM BRIGGS  STRATTON 272171 CYLINDER HEAD GASKET
NEW OEM BRIGGS STRATTON 272171 CYLINDER HEAD GASKET
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NEW OEM BRIGGS STRATTON 272167 CYLINDER HEAD GASKET LOT OF 4
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NEW OEM BRIGGS  STRATTON 272164 CYLINDER HEAD GASKET
NEW OEM BRIGGS STRATTON 272164 CYLINDER HEAD GASKET
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NEW OEM BRIGGS  STRATTON 272157S CYLINDER HEAD GASKET
NEW OEM BRIGGS STRATTON 272157S CYLINDER HEAD GASKET
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Honda GX390 13HP Piston Kit Air Filter Connecting Rod Cylinder Head Rocker Arms
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
CASE 446 TRACTOR CYLINDER HEAD AIR HOUSING PART 134 4371
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Pioneer NU 17 Chainsaw OEM Piston Cylinder Head
Pioneer NU 17 Chainsaw OEM Piston Cylinder Head
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NEW OEM BRIGGS  STRATTON 692110 CYLINDER HEAD GASKET
NEW OEM BRIGGS STRATTON 692110 CYLINDER HEAD GASKET
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Honda GX610 V Twin Cylinder 18HP Engine Head Bolts
Honda GX610 V Twin Cylinder 18HP Engine Head Bolts
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CASE 446 TRACTOR RH CYLINDER HEAD PART  110 2564
CASE 446 TRACTOR RH CYLINDER HEAD PART 110 2564
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OEM TECUMSEH CYLINDER HEAD GASKET PART 36477
OEM TECUMSEH CYLINDER HEAD GASKET PART 36477
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CASE 446 TRACTOR LH CYLINDER HEAD PART  110 2563
CASE 446 TRACTOR LH CYLINDER HEAD PART 110 2563
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McCulloch 40005102 11 07248 Blower Cylinder Head
McCulloch 40005102 11 07248 Blower Cylinder Head
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BRIGGS  STRATTON CYLINDER HEAD Part 691160 691717 214193 214368
BRIGGS STRATTON CYLINDER HEAD Part 691160 691717 214193 214368
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John Deere GT235 LX288 SST18 2 Cylinder Head Briggs AM132458 LG808384
John Deere GT235 LX288 SST18 2 Cylinder Head Briggs AM132458 LG808384
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Briggs  Stratton 796471 Cylinder Head USED  OEM Part
Briggs Stratton 796471 Cylinder Head USED OEM Part
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John Deere GT235 LX288 SST18 1 Cylinder Head Briggs and Straton LG808383
John Deere GT235 LX288 SST18 1 Cylinder Head Briggs and Straton LG808383
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Echo 351VL Chainsaw OEM Piston Cylinder Head
Echo 351VL Chainsaw OEM Piston Cylinder Head
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Briggs  Stratton 271917 10 Cylinder Head Gaskets
Briggs Stratton 271917 10 Cylinder Head Gaskets
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Tecumseh Power Sport 6 HP OHH60 Cylinder Head w Valves Springs Retainers OHV
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Briggs  Stratton 796479 Valve Cover Cylinder Head Cover USED  OEM Part
Briggs Stratton 796479 Valve Cover Cylinder Head Cover USED OEM Part
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Genuine Briggs  Stratton 692249 Cylinder Head Gasket OEM
Genuine Briggs Stratton 692249 Cylinder Head Gasket OEM
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Massey Ferguson 8 H80 Tecumseh 8HP Side Shaft OEM Cylinder Piston Head
Massey Ferguson 8 H80 Tecumseh 8HP Side Shaft OEM Cylinder Piston Head
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Briggs and Stratton cylinder head 795501      JSE
Briggs and Stratton cylinder head 795501 JSE
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JOHN DEERE 175 HYDRO LAWNMOWER CYLINDER HEAD PART  AM109218
JOHN DEERE 175 HYDRO LAWNMOWER CYLINDER HEAD PART AM109218
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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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Kohler Magnum 18 M18 18HP OEM Piston Cylinder Head
Kohler Magnum 18 M18 18HP OEM Piston Cylinder Head
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New Honda GX390 13HP Rocker Cylinder Head Kit Inlet  Exhaust Valves Head Gasket
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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Echo PB 200 Blower Cylinder Head
Echo PB 200 Blower Cylinder Head
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Echo CS 60S Chainsaw OEM Piston Cylinder Head
Echo CS 60S Chainsaw OEM Piston Cylinder Head
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CYLINDER HEAD GASKET FITS HONDA ENGINE G100 25CC
CYLINDER HEAD GASKET FITS HONDA ENGINE G100 25CC
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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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