struck1

does anyone have any suggestions on where to aquire some ka24de forged pistons??? thay have to be .40 over oversized and forged....i have been searching for days and they are very hard to come by...unless you wanna spend 700 dollars on the set.....ive tried boostdesigns and even he has had problems finding them...ive e-mailed cp pistons--called je pistons--and done numerous searches...please help as i have everything to put this car back together EXCEPT pistons so i cant even do my machine work...thanx

ProjectMy240

you shouldn't be having any problems. Boostdesigns sells stuff. cp and je pistons for our cars. very good. yes your gonna have to spend 700 dollars or more if u wanna play. old saying *u wanna play your gonna pay*

ProjectMy240

or search into some arias pistons

struck1

boostdesigns has some for it but they are only .20 over and that is what i am finding with everyone...hard to find the .40 over.....p.j. has been looking for over a week for the wiseco .40 over but no luck as of yet.......i think i checked arias..i think they were either .20 over or under 9.1 compression..not to sure have to look at my notes again

struck1

spending 700 wouldnt be bad but the .20 over are only about 450..shouldnt be that big a price difference..i dont know..thats why i asked

ProjectMy240

alright i know someone that also comes to the forums a lot! He helped me firgue out the the same thing. What i would do is this. 1. dont go over 30 over. 2. buy forged rods and pistons. 3. take your block,crank,forged rods and pistons and tell them u want the block bored 20 over. and have them machined ur crank and re-install everything back in.

Right now my setup is this.. I'm gonna my shop to bore mine 20 over with Pauter Rods and Arias Pistons. Then i'll install a metal head gasket. go with 15 psi of boost and put the top end back together and get stage 2 turbo cams.

Maybe the person that helped me out a lot will post here and give u more info

struck1

i have to 40 over because of the cylinders....head is already getting decked and metal gasket, new crank and rods....port and polish head..the whole works........the head work is already done..just waiting for the pistons to finish the bottom end ...going .40 over shouldnt be that hard..wiseco even offers some .60 over pistons. i just wondered if any one knew of a distributor other than the manufactuor(sp)..wiseco has them but i cant order direct from them...boost designs said he had them for 440 bucks but now is having problems finding them..everything is stripped waiting on pistons....its not like i plan on doing this in 6 months or anything...it is at the machine shop now

wikd240

the next size up pistons are .20 over .5mm takes the bore out to 90 mm... finding .40 over pistons in any form is going to be a pain in the *** because they are not a piston that is called for... even finding rings that are bigger than .20 over is a pain in the ***... i know i need a set... if you were to order custom pistons then you are going to pay a grip... and .40 over pistons are custom...
the size would be like 90.834... or some **** like that... none standard size = more money for one offs...
projectmy240 listens well... i was the one to tell him about the motor...and in my opinion boring it out that large will make for weak cylinder walls... thats a problem you dont want to have to deal with...
my block is 20 over and that is the safest i feel it can be over bored... get the .20 over and you will be happy... or pay for the custom .40 over pistons and have thin walls and run the risk of head gasket failure or worse yet collapsed cylender walls...

struck1

stock pistons are 89mm so .20 over is 89.5 and .40 over is 90...i find them on the charts...wiseco offers 40 over---which is 90mm--but i cant order direct from wiseco.....i have the service manual for my car( from a friend at nissan) and max bore is .90 and that is nissans max bore...because of the scarring in the cylinder i have to go 40 over......wiseco even offers .60 over but that is too thin for me....im not trying to argue or anything but trust me after you spend 2 weeks looking nothing up but ka24de pistons online the numbers kinda sticks

struck1

this is from the cp piston catalog...the part is for .20 over which is 89.5 mm

Nissan
Part# Eng Code Bore Size CH CR
SC7300 KA24DE 3.524" /89.5mm +.020/+0.5mm 1.339/ 9.0

wikd240

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struck1

anyone bought pistons that were .40 over and where did you get them?

ProjectMy240

no i dont think anyone has thats a little bit too crazy.

struck1

why is .40 over crazy? that is taking 1mm off of a cylinder wall that max spec from the service manual is over twice that...it must not be too crazy if wiseco has pistons on the shelf that are .60 over...must be some demand for them..please dont flame.... if you havent or dont know anyone who has then please just dont answer..i am asking a serious technical question..