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
Comments from our Readers
kinnamon / roscommon, MI, UNITED STATES
Posted Sep 03 2007 09:20PM
this is a question, not a comment. i have a 88 yota 4x4 with a 22re that is junk. ive looked at my options and weighed them all out and am thinking about buying a 22re from my buddy, but it is out of an 84 motorhome, would this motor bolt onto my manual trans and what other problems might i have?
broketoy / orlando, FL, UNITED STATES
Posted Oct 19 2007 06:41PM
this is not a comment i am wondering if any one knows where i can get a book that will tell me step by step how to put back togther my 93 22re motor
tommartn / ottsville, PA, UNITED STATES
Posted Nov 26 2007 04:33PM
just tree things here, the dispacement for the engines is wrong, on my toyota firewall plates here it says, 20R 2189cc/133.6cu.in. and 22R 2366cc/144.4cu.in. there was just one cc added to both engines. 75 was the first year for the 20R, not 72. not only were 20R rockers cast iron, but my 81 toyota has cast iron ones as well. and thats a 22R. can anyone tell me if a 22r carb will bolt onto a 20R intake?
classic yota / baker, OR, UNITED STATES
Posted May 07 2008 05:30PM
i resently converted my 1977 toyota 20r to a different carb setup. although the motor is in a 1977 celica, it would be perfect in a truck. i took an extremely aboundant carb and redrilled the intake to make it work. i used a carter 2barrell off a dodge 318 v8. i blocked off all antifreeze lines that used to run to the bottom of the carb, and replaced one of the old censors with a brass nipple and just diverted the flow of coolant back to the engine. the torque is amazing! take into mind i also run a 3inch high flow exhaust and 14by3inch air cleener. i welcome all questions. Great info on the site and thanks for all your help!
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