Saturday, August 8, 2009

Volvo B20/21 rebuild

Less than a week before having to leave to take a new job in Portland, Oregon, the engine parts I had ordered back in May finally arrived! It took three nights this week, each one going well into the early morning hours to get this baby back together, but she's ready to rock at last. As of last night, the B20 (with B21 internals) is running great, with no leaks or problems, and there are just a few hours left until we roll out for a 900-mile move!

A lot of great work and cool mods had already been done to this motor when I pulled it apart---most notably to the head---but it is pretty clear that the shop or individual that put it together before I owned it did a very sloppy job. I initially tore it down because of a rod knock, but I found scored lifters, a badly rounded-off and uneven cam, broken rings on two of the pistons, and a nearly frozen oil pump...this thing shouldn't have lasted as long as it did...

The current build now consists of:

B21 pistons, rods, and 8-bolt crank.
Milled bock and head to achieve 9.25:1 compression ratio from an F head.
VPD Street Performance cam.
IPD Hi-Rev valve-train kit.
Steel and aluminum timing set from VPD.
Housings machined for rubber crank seals.
Ported head with larger-than-stock valves.
IPD header.
Toyota alternator.
Crane Cams optical ignition.
IPD adjustable F.I. box
Lightened flywheel.
240 pressure plate for a stronger clutch.

Should be putting out about 160-170 HP---maybe I will dyno it once it is broken in...

Here are some shots from the build:





















1 comment:

Anonymous said...

Awesome! I just picked up a matching 71' 145s, would like to do all you have, only maybe the mikuni carbs! How has the performance motor held up?