Building my motor, got a question.

[slickster1013]

Ok, i am in the middle of building my motor, but i can't figure out which piston to go with. I'm going to turbo it, but not for awhile, i'm going to put the built motor in my car and break it in and everything, then add turbo later. So, arias 8.8:1, which alot of people go with, seems like it would be a turd without turbo, so then i thought cp pistons, which are 9.1 which would be better i think. Could i run high boost with 9.1 cp pistons, or would i have to lower my compression first? AND would using the stock pistons be better, because they are 9.6:1 i think. I just want a piston that wont make my motor a turd without the turbo, so please help me decide. And i was wondering if there is a kit to buy that comes with the cp pistons. THANK YOU

[Looneybomber]

First off, this should be in the KA forum, assuming you're rebuilding your KA. Anyway for what it's worth, my friend (mod on the CA forum) has 9.5:1 forged Al pistons in his CA. At 7lbs of boost his timming is being retarded to the point where he is only running 10 deg of advance total. Any more boost and his timming is falling through the floor. He is going to also add water injection to cool down his intake charge. Hopefully that will solve his problem.

Your biggest problem is heat. If you can get rid of it you can run a descent amount of compression and boost. For example, the 1.8L miata's are 9:1 and can run 12-13lbs stock with a good intercooler. The S2000's are all aluminum 11.1:1 and can run 6-7lbs stock, even up to 9 if you're feeling dangerous. R1's are 12.4:1 and can take 5-6lbs on pump gas.

To answer your question. Go for as high of a CR that you can without blowing up. If you're going to run 24lbs, then you will NOT want 9:1 pistons! If you're going for 6lbs, go with a stock CR.

[slickster1013]

I want to make 300 or so hp when i turbo my car. So i am not sure how many lbs of boost i will need to run to obtain that. But, my car wont be turbo'ed for awhile, so i am just building my motor, and i don't want it to be a turd without the turbo. But then again, when i do turbo it, i don't want it to blow up because my comp. is too high.

[scotttak]

im hungry.

[slickster1013]

That doesn't help me

[gepeto]

I dont think it's worth lowering the compression ratio if you're shooting for "just" 300hp.

[scotttak]

its not all about pounds of boost. you gotta think about ecu tuning and all the fuel delivery controls, timing, cams, etc... IIRC you can make 300whp at about 10 pounds?? i dont remember but i was surprised at how low it was. it really all depends on what you want. you can run stock internals to 300 hp but with really good tuning. if you post more on about what you want out of your car, such as reliability, drivability, sandwich making capability, then it would be a lot easier to get an answer.

[slickster1013]

Ok, i want 300-350hp.....would the 9.1 cp pistons work well for that? How many lbs of boost would i need to get that much hp?

[slickster1013]

Ok, i plan on getting new pistons, new rods, new cams, new flywheel (light weight) Bigger injectors, cam gears(if i can), new clutch, underdrive pulley, new water pump, new thermostat and then just put the built motor back in my car. Then later down the road i want to turbo it, so i want to make sure i go with the right parts, so when i do turbo the car, it will be very reliable, and fast. I'm looking to get 300-350 hp, it will be my daily driver. I want to run about 10 pounds of boost i guess, so will i be able to do that with a 9.1 piston (cp pistons) And my compression might raise a little from some head work being done too. I just want to know what the besat pistons rods and cams i should go with for what i'm looking for. Or if someone could point me to a kit i could buy that comes with everything i need

[Looneybomber]

Cams, 264's. Pistons 9:1. Have the block decked and your head milled if you need to. You should still be fine with 12lbs of boost assuming you have a good intercooler and a dyno tuned fuel map. You could also run water injection for when the boost gets up over 10lbs or something.

[slickster1013]

Are the 264's the best cam i can go with? I thought i seen some 272's on turbo240.com. And Is there a kit i can buy that comes with the 9:1 pistons, rods, and gaskets?

[scotttak]

the longer duration cams make the car less drivable...by that i mean it sucks driving it even though it goes fast.

http://www.import-autoperforma....html

i was looking into turboing my car. but then i decided to go 2 supercharger instead. I NEED LOW END TORQUE...for devious purposes. not supercharged yet, but someday....someday.

[slickster1013]

BTW, if you guys didn't know, i am talking about my KA24DE motor here.

[slickster1013]

So where can i find a kit to buy that comes with these pistons and rods and gaskets?

[scotttak]

well...that was the assumption taking into consideration your sig. and the fact that if you had another motor in their, it most likely would be an sr20, or rb series, so no need to bolt on another turbo. also, you have the chuki front bumper so it has to be a ka24de. unless you did a vq or vg or vh or whatever larger displacement swap. but then you wouldnt need the turbo for 300 hp.

sorry...im just kinda being a jerk because im hungry. and tired. im gonna go eat. i know you just wanted to make sure we knew that it was twin cam ka. cuz i knew that you knew and you probably knew that most of us knew that you knew that we knew.

[slickster1013]

I'm pretty hungry too, but i need to know where i can buy this kit before i can go eat something

[scotttak]

did u click on the link i posted?

if not here it is againhttp://www.import-autoperforma....html

[slickster1013]

Yes i clicked it, but you're not understandin me, i'm not looking for a turbo kit. i'm looking for a kit that comes with the cp pistons, and rods, and gaskets and all that good stuff to build my motor with. Turbo wont come til way later.

[scotttak]

not that i know of. but you can always try this as an optionhttp://www.amsperformance.com/...d=303

[slickster1013]

i've thought of that kit as an option, but, the CR is too low, without turbo it would be a turd. There has to be a kit out there somewhere that comes with the CP pistons, or some sort of 9:1 piston

[slickster1013]

And why would the 272 cams be a bad choice? How does it suck to drive the car with that cam?

[scotttak]

im not saying it will suck to drive your car on 272 cams, i was trying to say the longer the duration, the more overlap. the more overlap = rougher idle and loss of low end power. but its better up top

[slickster1013]

Ok, i think i want to go with Wiseco pistons...9:1 CR .020 overboreCrower Forged connecting rods, so does anyone know where i can buy these items? I need to get these parts ASAP to get the ball rolling on my motor build. Still not sure which cams to go with, the 264's or the 272's....so any experiences with either of these cams would be very appriciated.

mainly, i need someone to help me find a place to buy my pistons and rods from so i can order them now

[slickster1013]

anyone know where i can buy these?

[Looneybomber]

Ok, i think i want to go with Wiseco pistons...9:1 CR .020 overboreCrower Forged connecting rods, so does anyone know where i can buy these items? I need to get these parts ASAP to get the ball rolling on my motor build. Still not sure which cams to go with, the 264's or the 272's....so any experiences with either of these cams would be very appriciated.

mainly, i need someone to help me find a place to buy my pistons and rods from so i can order them now

With a little searching and some reading in the KA forums, you'd have all the answers for you and you'd make up your own mind instead of us making it up for you.264's are agreeably the most radical cams you can run and still be streetable. With putting in a light weight flywheel (like you mentioned) and running 272 cams, you'd have a hell of a time keeping from killing it everytime you had to get moving again from a stop sign or light.

Also, only bore your block if you need fresh cylinder walls. You can only bore it so many times before you'd have to get it sleeved. If you're never planning on rebuilding it again, then go for the .020over if that's what you want. Don't expect an increase in HP though.

Pay your dues and read just like everyone else had to do. "Give a man a fish and he will eat for a day..."zeroforum?id=170http://forums.nicoclub. ... rum?id=130

[PapaSmurf2k3]

theres a buttload of sponsors and advertiser specials going on all the time on here.. check the classifieds too. do a search for piston/rod. you dont neccessarily need a "kit" for the pistons and rods, you can buy them separate.

[slickster1013]

I only want the kit that way it comes with all the gaskets and stuff i need. I guess i'll just buy them seperatley. I want tto go with the wiseco pistons that are .020 over, and crower rods. i'll just search around the sponsors websites and look for them.

[slickster1013]

someone told me running the 272 cams, i wouldn't have a hard time keeping it from dieing, it would just have a big lope to it......they said that the bigger the cam the better, so i'm confused on which to go with, the 264's or the 272's