Topic: 21R????

[steveco.]

so a buddy blew up his "22r" in his 2wd pickup. pulled the motor and started lookin at the exhaust ports and they're circle. not a tear drop which i've seen the most.  i look on the block and it says 21R. so is was this thing made for another country or whats the story on these?

thanks

[79coyotefrg]

80-84 22R blocks have a round exhaust port after august 84 they went to the pear shaped ports
what shape are the intake ports??

that is a 21R block  

[-Jake-]

21R

The 2-valve SOHC 2.0 L (1972 cc) 21R was produced from 1978 through 1987.
Cylinder bore was 84 mm (3.31 in) and stroke was 89 mm (3.5 in).

Output in 1978, constrained by emissions, was 105 hp (78 kW) at 5200 rpm and 116 ft·lbf (157 N·m) at 3600 rpm. Air injection and California emissions equipment for the 21R-C (1982-1985) dropped power down to 90 hp (67 kW) at 5000 rpm. The air-injected Japanese version, the 21R-U, produced 105 hp (78 kW) at 5200 rpm and 120 ft·lbf (162 N·m) at 3600 rpm but dropped to 101 hp (75 kW) at 5400 rpm and 114 ft·lbf (154 N·m) at 4000 rpm in 1986.

edit:
Thats according to wikipedia

[BUDDERS]

The 21r was never produced for the US market but was a Japanese engine that did not meet US emissions restrictions.

Lots of these used engines were imported over here and advertised as 22R's by importers which resulted in law suits because these engines would not pass emissions (at least California emissions).  I'm sure a bunch of their parts will swap with the 20r's and 22r's though.

[79coyotefrg]

the crank shaft and rods are identical,  the block could 'maybe' be bored to take 20R pistons

[zippo]

That is kinda awesome. I would keep it.

[ninja turtle]

i had an 81 with a 21r and it passed cali smog

[BUDDERS]

i had an 81 with a 21r and it passed cali smog

The smog tech must have not looked at what block was in it and assumed it was a 20r, because as far as I know it wouldn't pass visual inspection.  They do look identical to the untrained eye though.

[steveco. [OP]]

it's funny cause it had a new style valve cover on it..   i think the plan is just to swap a 22R into it. 

[kneedownnate]

21R

The 2-valve SOHC 2.0 L (1972 cc) 21R was produced from 1978 through 1987.
Cylinder bore was 84 mm (3.31 in) and stroke was 89 mm (3.5 in).

Output in 1978, constrained by emissions, was 105 hp (78 kW) at 5200 rpm and 116 ft·lbf (157 N·m) at 3600 rpm. Air injection and California emissions equipment for the 21R-C (1982-1985) dropped power down to 90 hp (67 kW) at 5000 rpm. The air-injected Japanese version, the 21R-U, produced 105 hp (78 kW) at 5200 rpm and 120 ft·lbf (162 N·m) at 3600 rpm but dropped to 101 hp (75 kW) at 5400 rpm and 114 ft·lbf (154 N·m) at 4000 rpm in 1986.

edit:
Thats according to wikipedia

That's the funny and frustrating thing about Wikipedia.  Some people think it's the last word and has to be true, but all it takes is one idiot to edit the page and mess it up.  I've looked over quite a few toyota pages and found many mistakes.  This is one of those pages.  As was stated, they weren't offered in the states but were later imported as a cheap and smog legal alternative to the other import option, the 20r and the unavailable 22r.  I don't know the exact story but I know it's on this site in more threads than one    

I did talk to a couple smog shops, engine shops and importers and got the same exact story from them all.  I had one in an 83 4by and had it smogged twice without issue, but you couldn't pay me to run another.  The hp numbers are skewed, they're supposed to have 30% less power than a 22r, and having not been able to pull hills or even use 5th on the freeway with 215/75s, I believe it.

What's funny is when people think they have something special.  I guess it is special in the same kinda way that bloody slobber covered bird your dog leaves on the floor for you is special