As the B20A5 in my 90 Prelude si seems to be considered unworthy of up-grading, What is a good swap, and what's involved? What would it cost?

 

Wow our all 3rd Genners as ritarded as us?!

https://honda-tech.com/zerothread?id=804841

This link is on the Prelude page like 10 up from your thread DURRRR!!! Plus if you searched you probobly would have found 100 more just like these two.

BTW h-22 swap generally costs in excess of 6 grand.

 

Has anyone successfully modified these engines? What are they capable of reliably? What are their weak points? Has anyone documented their efforts?

I really don't want to spend large amounts of money for a H22 swap. I don't see many performance parts for these engines in the aftermarket, but since it is a 16 valve two litre. It seems that 165 - 175 hp normally asperated shouldn't be to tuff to find. I know it's not vetec level performance, but I thinkl it would be a fun project. Thanks!

 

Well this guy http://splorg.org/people/b/prelude/dyno.html made 20 horses with header/exhaust/cat and tuning of the cam gears. So they can make good power if you do the N/A buildup correctly a lot of luders don't. A good intake/header/exhaust setup with some adjustable cam gears, increase the 9:1 compression a little and tune up the fuelmaps (s-afc or something like this). Should give you quite a bit of power. I'm guessing near 5psi of boost level of performance!

Also make sure to check out preludepower to see what others have already done.

 

I think that sounds reasonable.

Some people have issue with the sleeves in the 2.1 motor but I don't think these are the same cylinder sleeves that are in the B20a5 motor are they? Different material for the larger bore of the 2.1?

What about the cylinder head is bad?

 

The B21a1 uses FRM sleeves which work just not with the material the rings are made out of. The b20's sleeves aren't like this so they usually don't get worn out as bad.

They cylinder head is bad I beleive because it is the place that robs these motors of thier power. Mostly because the different parts are not sized accordingly to one another.