NPR Pistons, How good are they?

[frontierguy25]

Just like the title says guys, I'm wanting to know if they are ok. I have rod know in the motor that I have now and the block is rusting away. I've found a place that is going to sell me a short block with my trade in (spare motor) for a good price and a small warranty. But this is the best bet that I have for the limited funds and time that I have. My car is my daily driver still on Lex AFM, I do have a 58mm bolt on turbo and all I'm looking out of this motor is 450rwhp on race gas when I go to the track. Other than that just my DD!

I have searched a lot and read where Joliroger and Sethron run these so I'm starting to feel more confident in them. They are not going to be installed with the chrome rings btw.

Thanks in Advance guys.

 

[Doward]

They are stock cast replacements.

I would not do 400+rwhp on cast pistons. Hypereutectic or Forged.

 

[frontierguy25]

I have JE's in the motor that I have now, but one of them has some slight damage to the top of it. The sides looked ok though. I know that I can just buy 1 more JE and get new rings and have the spare I have bored over, but that is a lot of money right now and I don't have it. I'll be selling a lot of parts in a for sale thread today to help. This is a good deal on a motor and it's all that I can afford. Not having a job is killing me. So I guess I just have to deal with what I can afford for now and run a little lower boost.

Doward, you get my last PM?

 

[rtrdpenguin]

I'm running them, but haven't had them in for very long so I can't really comment on longevity, but they look to be good quality. They are cast stock replacements like Doward said, so I wouldn't look to boost very high on them

 

[frontierguy25]

I've seen lots of people run pretty good boost levels on a stock motor and run over 500rwhp on a stock block. I have plenty of fuel for the boost plus some. I'll only be running 15-17psi so under 400rwhp daily and 23psi about 450rwhp at the most at the track with race gas and tuned! I guess we will see.

 

[rtrdpenguin]

True, if you're tuned well even cast pistons should hold up. I'd feel much safer going forged if I were building a high HP engine though. Comparing these to my stock pistons they were remarkably similar, and nippon is quite an established company, so I wouldn't worry too much about them randomly cracking or having defects at least

 

[frontierguy25]

That is why my current motor has JE's in it, I planned on going well over 500rwhp, and I have the fuel system for it as well. But right now in my Life I can't afford it. Plus I've seen many Stock bottom end MK3's with 500rwhp. I think that with everything I already have on my car I'll be able to do this and be fine. 400rwhp is enough for 11's. I just ran a 12.6@113 with a bhg and about 370rwhp and had to coast the last 120' because the HG blew, this was with a 2.0 60' as well. Now with the tires I have and a good motor I should be able to hit high 11's all day on pump gas and about 17-18psi.

 

[joliroger4]

Those NPRs will be fine for what you are doing. I've had them in the grey car since January of '05.

 

[grimreaper]

my stockers are holding fine, granted i dont beat on it for the simple fact it is my dd right now as well. (14-16psi sp61)

Run what you can afford man, the ONE (you know, that 7m that we all have built in our head with no budget, top shelf parts and very few have actually built) can come later.