NPR vitara piston rings material?
 

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finally got my dad to finish boring my block at work today, setup is 75.5mm vitaras, npr rings, ls rods, arp rod bolts w/ a k26 turo trying to make 250whp, a guy at work told me that you hone the block with finer/rougher grit depending on the material of the rings to seat them correctly, which i really dont think makes any difference for my setup but I was trying to see if anyone knew the exact material of npr rings that go with the ycp vitaras which I got from fjt on ebay. its either cast iron or nitrated steel from what I found online or a combination of both, really just trying to see what you guys use to hone, most likely i will just use my 220 grit hone and be done with it. Also what do you guys think of npr rings compared to hastings?

Re: NPR vitara piston rings material?
 

i dont know what they are made of but my machine shop just bored, honed it with no questions so im sure that a regular procedure will work fine with them.

Re: NPR vitara piston rings material?
 

Gray Cast Iron

Re: NPR vitara piston rings material?
 

i need a bar cutter with a 1/2 inch shank to finish my ls vitara setup, our haas mill only came with a one inch shank and it is bigger around the bushing im trying to make

Re: NPR vitara piston rings material?
 

i think i have found enough info to say the top ring is crome and the second is cast iron. im just going to use the 220 grit hone i have and that the hone grit is not that big of a deal unless the wall is too smooth and i wont have a problem with that , thanks for the input

what are you trying to machine? and im sorry for you having to work around a haas-the one we have at work is straight up the biggest piece of ----, hell the 20 year old mat 500 gets better results

Re: NPR vitara piston rings material?
 

Thats retarted

Re: NPR vitara piston rings material?
 

how? there not the same material or finish atleast

Re: NPR vitara piston rings material?
 

These Vitara's are Legendary!