A couple of years back I pulled my H22A4 from my '99 Prelude to rebuild it. I tore the motor down, leaving only the pistons and crank, before bringing it to a shop for cleaning. I left the pistons in so that the carbon ridge could be removed before taking them out. I distinctly recall the cylinder walls being green like thin sleeves were pressed in. I noticed that the shop had overly honed the thing, so I brought it elsewhere for repair.
The next place over bored it, so I ended up buying a brand new block. The new block’s cylinder walls have no shade of green whatsoever. You’d think that there would be an obvious line where the fiber-reinforced-metal liners stopped. Are my eyes playing tricks on me?
I built this thing anyways, and it’s already back in my car, but I can’t stop thinking about this now…now that it’s too late.

 

my H22A4 i pulled out with 140,000 miles had grey cylinder walls. The green might have been some chemical or oil.

 

grey here as well from what i remember.

 

FRM is definitely a dark grey in colour.

 

yellow