sorealsosurreal

ok so to use a press fit, did you just use the pin from the 240 rod and press it into the ka24 piston and there yeah go or what? im going to order from a company called EPWI (my school has a deal with them) and the pistons i will be getting from them are the ITM pistons or another brand that i cant think of at the moment

for piston pins how many of you are using full floating pins compared to press fit pins. i was told to use a full floating pin by boring the rod and throwing a bushing into the rod, advice anyone?

i actually do plan the n42 head, but im glad to know a 1mm gasket thikness is alright, i looked at your site and it said that you dont supply the std bore anymore (89.mm) can i ask why?

now that i saw that im thinking about taking a trip up there.

http://www.atomicspeedware.com/gasscenis.htm theres a copper gasket for the L series but was told you dont want one on a street engine.

yeah, let me know what those ones are and from where, im guessing they ar 89mm? did you deck your block?

hahah i know i know, its a cancer!

ouch! well if you do buy the car and do the swap let me know how much you want for it and i might take it off your hands

haha thanks its still very good info i havnt oredered pistons yet so i also havnt ordered a head gasket. i was wondering about taking layers out of the metal gasket but figure it wouldnt give a seal but thats very good to know. much appreciated

well if you buy the car can i take the blown motor off your hands?

man i feel blessed to live in cali and have a rust free Z, i really feel for you guys. the only rust i have is a little surface rust on my little battery cover door which is from rubbing up against my hood.

question. where are the balancing pads on the 9mm 240z rods. there isnt really any noticable balancing pad on them like there is on a chevy rod. anyone help me out?

Ok so I think I'm going to go with a ka24de piston and then before I buy me head gasket make sure that there will be no clearance issues between piston and valves +1mm for the preferred head gasket and if so ill just go and buy a 2mm. Now if only some one made stock compression forged ka24de pistons (9.5cr). I searched the web and it seems even the 240sx guys couldn’t find them for their car!

so the piston isnt going to make contact with anything with a 1mm head gasket?

so im building a stroker motor and am not sure what piston to use. im looking for a forged piston and plan on running a N/A high compression engine (10.5-11.5:1) not sure if all nissan ka24 pistons are forged but some of the pictures ive seen it looks that way. also before i buy a piston i need to know what headgasket to use. i was told that in doing a 3.1L stroker that the piston will rise above the deck surface .6mm so he encouraged me to use a 2mm head gasket. id perfer a 1mm if possible because its less likely to cause me trouble. anyways, advice on piston whether its oem or aftermarket (dont have money for custom) would be very helpful oh and the head i plan on using is an N42 if that helps at all. thanks everyone! Matt

thanks for the imput guys i guess NA stroker it is

Ok thanks for the heads up, I've worked on cars a lot (mechanic) but never built an engine before. Didn’t know that the KA pistons would surface out of the block. I was thinking of using an aftermarket KA low CR turbo piston for the build. I’ve skimmed through this write up on building a 3.1L stroker many times http://www.geocities.com/row4navy/engine.html and I didn’t see the writer never mentioned his head gasket choice or what he did to the pistons whether they were shaved or not. So here's my question to you. If I used a 2mm head gasket and a deep-dish piston (no clue which one, pointers are welcome) would the CR be turbo applicable? as far as the carb vs FI I like the idea of a carb and it involves a lot less to worry about although I know that I would lose about all tuning capabilities

ok changed my mind again, thinking of a blow through setup on my 3.1L. what i need to know is what compression KA pistons would give me an 8.5:1 cr in a 3.1L with a 1mm headgasket and no deck of block or head. all the z calculators give you a choice of pistons but i dont understand how to put in an aftermarket pistons and convert the info they give you on the aftermarket pistons to the dishvolume it asks for on the calculator. http://www.atlanticz.ca/zclub/techtips/calcs/engine%20builder/index.html i plan to if i do this set up run the car on low compression till i have the money for the turbo parts. should i throw this into the turbo thread? i really hope this post makes sense. thanks everyone Matt

:cry2:nevermind going to part out the 280z. but on another note the engine from it turned out to have nice beautiful thick walls. and i got all my ARP hardware yesterday. now in search of some pistons! and with the other f54 block i think ive decided when the time is right to make a blow through turbo setup. i have the block, crank, rods, and a spare n47 head so why not????

awesome thread, once i finish my 3.1L which wont be till like may or so, our college has an engine dyno and ill be sure to post!

ACTUALLY I DID JUST THAT! im the proud new owner of a 1975 280z. It had the n42 block but not the head. an N47 if anyone wants it. my dad and i are now think of what to swap into it. the previous owner had taken it aprt to restore it and had money troubles and its been sitting in storage for who knows how long. came with brand new nissan sheet metal for the hood and fenders. everythings there just not together all for $500

ok thanks for the info im going n/a but still the f54 block i have is just to thin. im hunting down an N42 as we speak. just sorta pissed considering this is a college project im getting graded on and if waisted the time i have preping this block. oh well what can yeah do

ok so its probably just out of a 280z and he didnt know???

okay well i looked really quickly and found an n42 block but its out of a 260z versus a 280z so the bore is 83mm vs 86mm. is there room to bore it out to 89mm anybody?

so im building a 3.1L for my 240z starting with an F54 block out of a 280zx turbo. i used a sonic tester to measure the clinder walls and got a couple readings that are concerning me. the samllest being .075 which turns out to be almost 2mm and if i have to bore from an 86mmbore to an 89 that will leave me about .5mm of wall thicknes. being that these smaller measurments are towards the bottom of the cylinders will this really matter. can any one whos actually machined a 3.1L themselves give me any advice on this. thanks Matt