:nervous: About to rebuild the engine in my 91 prelude. It has 220,000 on it. I've owned the care for about 5 years. The car itself is still super clean. It is a 5 spd. Does anyone here have any experiece with these engines? Or rebuilding Honda engines in general? I am a mechanic by trade but the only engines I've rebuilt were American made 6 and 8 cylinders. I just want to make sure there is nothing out of the ordinary when building these engines. The first thing I noticed that is unusual to me is that there are multiple sizes of bearings and piston sizes possible to find in the engine from the factory. Is this going to be an issue? I plan on finding that I will need to have the crank ground and cylinders bored. I'm hoping all I have to do is have everything machined .010" over and just get all bearings, and pistons as a standard set .010" oversize. Does this sound reasonable? Any technical tricks or special things to take into consideration when rebuilding Honda engines would be greatly appreciated. Thanks. Randy :nervous:

 

the b21a1 engine has FRM cylinder walls that require special tools to hone them,though if you bore past this, I guess you can just use normal honing tools since the FRM will be gone.

if you're assuming that you need too have they cylinders bored because you're burning oil, there's a much better chance that your walls are fine and the rings are chewed up.

look at this preludepower.com discussion of the b21a1 engine: http://www.preludepower.com/forums/s...d.php?t=191845

 

heyfrench, thanks for the reply. I noticed the cylinder walls had some kind of white coating on them when I had the head re-done. That is what intimidates me. Do you know what FRM stands for? If I take the block to lets say a NAPA machine shop are they going to know what they are doing if all it needs is honing? Or are the special tools affordable enough that I can do it myself. Believe me I'm going to measure re-measure and measure some more before I decide to bore it. What would you do? Wouldn't you just botr iy .010 over just to make it more simple and get a little more power out of it?

 

Fiber Reinforced Metal--also known as MMR (Metal Matrix Composite- http://www.saffil.com/pdfs/automotive/data/mmcprop.pdf )