Toyota 4 Cyl. Engine Information

Nov. 01, 2000 By Jack Alford

Toyota 2*R 4 Cylinder Engine Specifications:

20R, 2190cc displacement, 8.4:1 compression, 96 hp
22R (Carb), 2367 cc disp, 9.0:1 compression, 100 hp
22RE (EFI), 2367 cc disp, 9.4:1 compression, 116 hp

Blocks:

(The 20R was first available in 1972 in the Pickup.) 75-80, 20R: (NA)
Bore: 88.5mm
Stroke: 89mm
Stock Piston: (NA)
Notes: 81-82.3, 22R/22REC: (SBTO80)
Bore: 92mm
Stroke: 89mm
Stock Piston: (PATO80)
Notes: Best Choice for Pistons (dome top). You can just deck
the block by 2mm and make this identical to the post-85
block. 82.4-84.7, 22R/22REC: (SBTO80L)
Bore: 92mm
Stroke: 89mm
Stock Piston: (PATO80)
Notes: Best Choice for Pistons (dome top).You can just deck
the block by 2mm and make this block identical to the
post-85 block. 84.8-95, 22R/RE/REC: (SBTO80LC)
Bore: 92mm
Stroke: 89mm
Stock Piston: (PATO80L)
Notes: Best Choice for Block. Piston is Flat-top. Block is
2mm shorter than previous 22R. This gives you a little
bit more compression, but you need an adjustable cam
gear to get cam timing right. 85-88, 22RTEC: (NA)
Bore: 92mm
Stroke: 89mm
Stock Piston: (PATO80T)
Notes: Piston is dished. (?)

Heads:

75-78.7, 20R: (CHVTO8)
Intake Valve: 43mm x 8mm x 115.4mm (IVTO8)
Exhaust Valve: 36mm x 8mm x 113.9mm (EVTO8)
Notes: Best Choice for Head. Hemispherical combustion chamber.
Stock flows adequately for 6500 rpm.
78.8-80, 20R: (CHVTO8L)
Intake Valve: 43mm x 8mm x 115.4mm (IVTO8)
Exhaust Valve: 36mm x 8mm x 113.9mm (EVTO8)
Notes: Hemispherical combustion chamber. Mounts for power steering and mechanical fuel pump. Stock flows adequately for 6500 rpm.
81-82.3, 22R: (CHVTO80)
Intake Valve: 45mm x 8mm x 113.4mm (IVTO80)
Exhaust Valve: 37mm x 8mm x 112.4mm (EVTO80)
Notes: Swirl-type combustion chamber, poor intake ports. Not enough flow for more than 5500 rpm.
82.4-84, 22R: (CHVTO80L)
Intake Valve: 45mm x 8mm x 113.4mm (IVTO80)
Exhaust Valve: 37mm x 8mm x 112.4mm (EVTO80)
Notes: Swirl-type combustion chamber
85-95, 22R/RE/REC: (CHVTO80LB)
Intake Valve: 45mm x 8mm x 113.4mm (IVTO80)
Exhaust Valve: 37mm x 8mm x 112.4mm (EVTO80)
Notes: Head is closed chamber. Domed piston won't work here. If racing rules require flat top pistons, use this head!
85-95, 22RTEC: (CHVTO80T)
Intake Valve: 45mm x 8mm x 114mm (IVTO80T)
Exhaust Valve: 37mm x 8mm x 113mm (EVTO80T)
Notes:

Carb Info:

Carb Flow
Stock 20R Aisan 190 cfm
Stock 22R Aisan 326 cfm
Weber 32/36 325 cfm
Weber Dual 38 390 cfm (Downdraft)
Weber Dual 40 405 cfm (Downdraft)
Dual Mikuni 40 PHH 724 cfm (181 cfm per tube)
Dual Mikuni 44 PHH 844 cfm (211 cfm per tube)

Stock Cam Specs:

For 1975 and up 20R's and non EFI 22R's:
Intake Duration- 272 degrees
Exhaust Duration- 248 degrees
Intake Lift- 10.1 mm
Exhaust Lift- 9.7 mm
For EFI 22R's:
Intake Duration- 248 degrees
Exhaust Duration- 280 degrees
Intake Lift- 10.0 mm
Exhaust Lift- 9.7 mm

General Notes:

  • 20R and 22R Intake will not swap.
  • 20R and 22R Exhaust will swap.
  • 20R and 22R Cams are interchangeable. Cam design never changed from the early 20R to the present.
  • Note that the TRD "oversized" intake and exhaust valves are only oversized if you're talking about a 20R! They are 44mm/37mm--actually 1mm _smaller_ than the 22R valves!
  • If the 20R can flow enough air for about 6500 rpm, this is a 250 cfm theoretical maximum on a 20R block, 271 cfm theoretical maximum on a 22R block.
Best combination of parts (for power/reliablity).
  • 75 20R head
  • 20R Intake
  • 22R Intake & Exhuast Valves
  • 22R Aluminum Rockers Arms (20R ones are steel)
  • 81-84 22R dome-topped pistons


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