Are there issues with the cylinder walls of the b18 or b20 series engines?

I've done some searching and only found a little info, that boring or honing the cylinders can be problematic, do to that they're thin or other reasons?

Re-sleaving is the other way...takes an oven right? That'd be a big oven, so you'd have to take the block some where equipped to do that?

I'm trying to educate myself...at some point I'll most likely get a jdm, but while it's out of the car, I want to make it as new as possible. Maybe a different crank, rods and pistons too.

The only other block I've seen is DART, that's more than I want to spend on a block.




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Theres nothing inherintly wrong with the b18 cylinders. B20 cylinders tend to be weaker due to their design.

You see people resleeving blocks because above 400whp the stock b18 sleeves have a higher chance of cracking. B20 sleeves i think start habing issues around 350hp?

You would have to bring the block to a machine shop thats equipped to resleeve blocks. You might need to ship it out depending on where you live in relation to a competent machinist. Also, with aftermarket sleeves you can run really big bores vs stock sleeves.

 

Bigger in either engine? Some of the b20 jdms are real cheap, but you never can know how they were treated.

I'm not trying to go real high HP, but I want as much bottom end as can be reasonable. The surest bet to do that is more CCs.

So how big while maintaining longevity, can they be bored? 84, 87....


Updated Info....I found a company in Ca. That specializes in this. They're saying the B18 to 84mm is the best way to go. They use gsr engines. Still pretty expensive.


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.5mm larger than stock to be safe. 81.5mm for a b18 and 84.5 for a b20

the only way to get 84mm out of a b18 is to use aftermarket sleeves.

once you resleeve a block, it doesn't matter if it's a b18 or a b20, the end result is the same (either engine will end up with the exact same sleeve when you use aftermarket sleeves)

Unless you're trying to turbo charge it and push well over 400hp, there's no reason to sleeve a block as long as you remain within the limits of the sleeve size (81.5 for b18 and 84.5 for b20). If it's NA and you just want to have a good daily, stock sleeves are fine.

 

You can have them CSS'd for reassurance

 

I wouldnt bother using a b20 block for css. Css tested them and they were still cracking at like 350-400hp where the b18 blocks are capable of nearly 1k hp with stock sleeves+css