21r to replace tired 22r

[crowsss]

I have a 2wd hilux with a sad and tired 22r and have access to a cheap 21r in good condition
is this an easy swap as I have been told the bell housing pattern is the same and both are carby motors
is it straight forward and what has to be changed
also how much power loss is involved
any help appreciated before I commit to engine purchase

[tomvale13]

"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] 22R

The 2-valve SOHC 2.4 L (2366 cc) 22R was produced from 1981 through 1995.
Cylinder bore was 91.9 mm (3.62 in) and stroke was 88.9 mm (3.5 in).

Initial output was 97 hp (72 kW) at 4800 rpm and 129 ft·lbf (174 N·m) at 2800 rpm.
By 1990 the 22R was producing 108 hp (81 kW) at 5000 rpm and 138 ft·lbf (187 N·m) at 3400 rpm.

The first fuel injected 22R-E engines appeared in August 1982.
Output of these engines is commonly rated at 105 hp (78 kW) at 4800 rpm and 137 ft·lbf (185 N·m) at 2800 rpm."

From:

http://en.wikipedia.org/wiki/Toyota_R_engine

[crowsss]

so the power seesm to be approx the same but I am still after information about how straight a swap it is

[tomvale13]