Piston question.?

do you must purchase pistons for some motor?
say I have my nissan motor, and it has a 90mm bore, Piston Pin Height 34mm, Piston Dish 2.8cc but the pistons for it cost $600 forged
and then I have found the same thing, only it doesnt identify my nissan's motor for a lot less.

I have run into this problem before. The best answer I can give you is to measure and know your engines plans before you purchase any parts as well as pistons. As long as your plans match aftermarket parts may be used effectively. Depending upon the application of your motor I could be sure all of the parts will interchange with the ones you're taking out of it. I could be sure when you purchase pistons that they all weigh the same, they all have the same wristpins, and the ring grooves are all the same depth . I have found that Japanese Imports are best when they're rebuilt with real parts from the manufacturers. They can be much costly but they'll last longer than most aftermarket parts. If you can not pay for real parts then I could research the alternatives and make a choice that best suits you. I have not had to put pistons into too many nissans because they stand up. If a person takes care of them and maintains them properly the body of the car will wear out before the engines will. Good Luck.

You could need pistons that were made to fit your motor, but there are lots of different businesses that make pistons.

It depends on what you're trying to do to the motor. Do you need forged, or can you go with cast? Aluminum or steel? there's lots of ways to cut costs, you just have to know what you may be able to get away with using less tough parts on.

you do have to purchase the right pistons for the engine.If you're boring it out then you have to identify to the parts dealler how much oversize you're boreing.You don't neccasarily need forged pistons unless you really have to have them made from somthing stronger and lighter.Other wise just ring a parts store and give them your car and engine make,year and model and any other setails they ask and they can track down the stock type pistons at a lower price.