Has anyone ever used these pistons, and if so have you had any issues with them ??? I just had a local shop rebuild my motor using these pistons, I drive away from the shop and my car is smoking like crazy. I call the shop and he says it'll smoke for a little bit and then stop ? Three days later, still smoking heavy. I pull the dipstick to check the oil and theres not a drop on the stick ? I bring the car back to the shop and he tells me that its probably the piston ring set that comes with these pistons that couldve failed. Now he's telling me that I have to put out more money to fix this problem when I just shelled out two grand for them to rebuild it. The only reason I chose the pistons was because I was told they are pretty much OEM Honda pistons, and I couldnt pass up on the price. Now I'm debating on whether to just go ahead and purchase new pistons and pay the labor, or do I need to file a claim and take this shop to court because i feel like I'm being swindled. He's telling me that because I purchased all the parts on my own that he cant guarantee anything. But he should be able to guarantee his work, am I correct ??? Please somebody let me know something, because I'm really on the verge of flipping out on these people over my car !!!!

 

I have them in my car, granted its only been 1000 miles, the car has run fine with them since I started it the very first time. Could be that they/you didnt seat the rings properly or they didnt install them correctly. NPR is an oem manufacturer for a few major car companies, so their quality should not be an issue if thats what the shop is suggesting.

 

he must of had cut lots of corners building ur motor. if a motor is built right from the start it will not smoke at all. but i have not use NPR pistons or never herd of them before. The closes thing to OEM i stick with are RS machine pistons. Ive built plenty of motors with the cast RSmachine pistons and every single motor has no problem,no smoking, compression is always good, and does not burn oil.

 

sounds like you might not have broken in your motor properly.

 

I've used NPR pistons in numerous builds. The only issues I've run into is with the oil rings breaking during installion. You really have to be careful with these rings as they are super cheap and very brittle. If your machine shop compressed them improperly and just rammed them in, chances are good he bent or broke your oil rings. You also, should have primed the motor before initial start-up by cranking the motor without the plugs and fuel injectors installed until your oil pressure light went off. Breaking the rings in varies in opinion from one shop to the next but I like to bring the motor up to temp, cool it down completely and then road test it. I vary my RPM between short, hard bursts of accelaration and decel by letting the engine slow the vehicle down and not the brakes. I continue this for about 15 mins the let it cool down again. This usually seats the rings nice and all the smoke (if any) should be gone.

This situation sounds to me like totally an ring installation issue and you should not have to pay anything to get this resolved. GL.

 

thanks guys I appreciate the info

 

bring a friend that knows about hondas or a mechanic with you, just in case they try to feed you some more bull...