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
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. (?)
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)Exhaust Valve: 36mm x 8mm x 113.9mm (EVTO8)
Notes: Best Choice for Head. Hemispherical combustion chamber.
Stock flows adequately for 6500 rpm.
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)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.
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)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.
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)Exhaust Valve: 37mm x 8mm x 112.4mm (EVTO80)
Notes: Swirl-type combustion chamber
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)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!
Intake Valve: 45mm x 8mm x 114mm
(IVTO80T)
Exhaust Valve: 37mm x 8mm x 113mm (EVTO80T)
Notes:
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:
Exhaust Duration- 248 degrees
Intake Lift- 10.1 mm
Exhaust Lift- 9.7 mm
Intake Duration- 248 degrees
Exhaust Duration- 280 degrees
Intake Lift- 10.0 mm
Exhaust Lift- 9.7 mm
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.
- 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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