KA machine work cost?

[kawitwofiddy]

hey guys, ive been searching for a little while on what i could expect to pay for machine work on my KA im building(which i will make a bild thread eventually!!) Had to create an account to search the forums (atleast i think) and still couldnt find s***, so i will just ask and hope noone says use the search bar because i have! anyways heres what i want machined:

Block: hot bathed and bored to 89mm,
head: cleaned, polished and matched to the block bore, maybe port??? ideas on that?
crankshaft: polished for sure, maybe shaved down a little? im getting an un-machined one as of now,
should i do anything with my intake? port?

Thanks fellas i was on zilvia and this guy said maybe ill have to try nicoclub since zilvia members always say use he search bar, and nico they actually are here to answer questions, so hope hes right!:)

[krash]

Welcome to NICO!

KA bore is already 89mm from the factory. I'd leave it at that and get it honed unless your cylinders are out of round, in which case you'd need to get new pistons and overbore. Headwork is awesome, but expensive. I'd just rebuild it fo factory specs unless you're really trying to squeeze the power out.

As far as the crank goes, just take it to the machine shop to see if its within specs. Nissan did a really weird thing with our crankshafts. Each journal is not the exact same size, they're off by like .000X inches. So each crank journal will need a specific bearing. There is a set of 5 numbers stamped on your crank (one number for each journal) and a number stamped near each journal on the block. For each journal, you add the two numbers together and get a new number. This new number is the "grade" bearing that you will need. This is all very annoying and it restricts you to using Nissan OEM bearings. What some guys do is buy oversized bearings that they want (clevite, acl, etc) and then take the bearings, block, and crank to a machine shop so that the crank can be turned to fit the bearings and have the proper oil clearance, and this I think is the best way to go for performance. I'd suggest checking with a shop that does nissan engines somewhat regularly.

As far as prices, it really depends on the shop you go to and the area that you are in. Check around some local forums for trusted machine shops and give them a call for some price quotes. They'll usually give you some figures over the phone pretty easily.

Hope it helps!

[kawitwofiddy]

i thought i had read that previously but wasnt sure, arent the inbetween cylinder wall surfaces already pretty small, and boring just makes them more fragile or something like that? my cylinders look pretty damn good, but i couldnt eye it for being out of round. should i take a micrometer to it? you think a hot bath is smart or just use a lot of degreaser and freshen her up myself? Im making a build, forged rods and pistons, and the clevite bearings, so i will take it all to a shop and have them take care of it. is it escential to have them balance the entire rotating assembly or can they just balance the crank. and yes it has helped already! it being my first build i shouldnt do stupid truly unneccessary stuff so thanks for straightening my head up! im gonna talk to a well known local shop owner at "suspicious garage" thanks though!

[krash]

I wouldn't be worried about the material between cylinder walls unless you bore to like 94mm or something, which I dunno where you'd get pistons for that. You definitely can't "eyeball" the cylinders and see if its out of round. Get the machine shop to check it for you, they have the tools and experience and they'll charge you like 20 bucks to check them. Its just unnecessary to overbore if you're not out of round and you have goo cylinder walls.

Hot tanking it is a good idea to clean out all the internal passages. Seems like you've got some research to do sir!

[PapaSmurf2k3]

+1 to everything Krash said.

I'd go for a factory rebuild on your head. If you really want to port/polish, you can do it yourself prior to bringing the head in (they'll disassemble and clean everything anyway). I wouldn't go too crazy, but a mild port and polish is a pretty easy thing to do with a dremel.

[kawitwofiddy]

alright good info thanks guys!!! and yes, i am still young to the drift world, i have sooooooo much to learn still!