hi i recently have had a #4 cylinder fail on me so its time for a rebuild. the #4 rod bearing is spun the machine shop wants to turn all the bearing surface down .030 on the rod and .010 on the mains. after that it would be nitrate treated and returned. my question is im planning on boosting, just wondering if the crank would be as strong as before, or should i buy a new one? i havent got a price on the nitrate treating yet till tommarow but is like $210 for all the machine work. another question is. Could the walls be bored and hone not sure, isnt it the wall some kind of special material. i thought it would be like mercedes where the walls are acid etched. thanks

 

Nitrate is a fertilizer and explosive. Are you talking about titanium nitrite?

 

The crank is fine, don't waste your money.

PS-Do a search on my name if you want to see how credible I am.

 

^ No need to search. He's credible.

 

so the crank is fine i just need to micropolish the rod side huh? ill go mic he rod and the mains and tell me what you think.

 

Ethier you or a machinist can polish both the main and rod journals. I am not sure how the process works, but if you think you can do it, good luck. The crank should be pretty polished already however.

Chris

 

okay im not going to have the crank grinded and treated i just found out from the shop its going to total $752.83 treating it is the expensive part. i can buy a brand new crank with that. we mic the rod journals the #4 rod journal is -.020 std
the rest are within spec. now looking at the shop manual every color bearing is only incresed by 0.0002 is that right? if so, anyone know of aftermarket bearings that are thicker thanks alot in advance

 

So....no nitrate? Dang!

 

the cylinder walls are made of a material called fiber reinforced metal. it is basically a mix of carbon fiber and aluminum.

you can't bore the walls as the space between cylinders is very small. Also, you need a special tool to hone; the machinist probably will not have it as FRM is specific to the s2000 and nsx i believe; most others use cast iron.