Well, look on the front of the motor for the block stamp. There you will find what kind of motor you have. The stock '88 CRX Si came with a D16, not a B16. So if you picked up a car that has another motor swapped in it's difficult to give you specs on it, especially if it's been modified. If a swapped motor is the case then you should try and find out all the details from the previous owner; only they would know exaclty what you have under the hood.

Also, try a search for topics on the B16 if you want to learn. There has been so much discussion on this that there is plenty to absorb till your hearts' content