Is D16Y8 good engine to upgrade?
 

No, it's not really a good engine to upgrade. You're better off leaving it alone, or swapping to something else. There's not much really offered for it, as it's a fuel mileage engine, that'll run for 250K miles mostly trouble free (you have to check the oil once in a while).

This is too vague of a question. What are your power goes and how much do you want to spend?

I have no idea what the other person above me is trying to say. Sounds like he is talking out of his ass at this point. Throw a turbo on the D16 and you can make low to mid 200's. I had a D16y8 with a supercharger, cam, and meth injection. It made 165whp at 2500rpms and it was a friggin go cart that put smiles on everyone's faces. My biggest mistake was pulling that motor/supercharger for a H22 (Prelude) motor. Your goals will determine whether or not the D16 motor is best for you.

If you're talking about what I said, about the D16Y8 being a mileage motor, that's what it is. If I'm wrong, then why does everyone want to run a "B" series engine, or do a "K" swap? I mean you even went to an H22 swap. Point I was making, is there's not much you can do to a D16Y motor. Turbo or supercharge is about it. Unfortunately is has a very restrictive bottom end oiling system, so it likes to eat #4 rod bearings (BTDT, rebuilt it).You'll never make any real power with the single overhead cam. Of course money always factors into it as well. But a good turbo (not e-bay) with all of it's bits and pieces will run 4 to 6K if you want it to live. For that kind of money, you can do a "K" swap and still have more reliable power, or the option to add a turbo or supercharger.

But still, it would be nice to know what his power goal is, and how much money he wants or has to spend (budget?).