KA build-up plans. Will go high comp NA, then go low comp Turbo. Assistance needed!

[DamnedButDetermined]

So far this is my plan.

I am driving my 90 fastback right now and will do so until the engine i am buying is completely rebuilt.

I am buying all of the neccessary parts to swap from a SOHC engine to DOHC soon wich include {engine, 5spd transmission, Complete wiring harness (engine harness & body harness connector), MAF, intake piping, coil, tachometer, power steering reservior and hoses, throttle cable and cruise control cable and brake booster vacuum hose!) So far the best price i have gotten is $700 for all that (let me know if you have a better price)

Then i will be saving up for a few weeks to buy a complete engine rebuild kit. Any help on this would be greatly appreciated (prices paid, websites found) Once i get the engine rebuilt then i will be swapping my SOHC pistons into the DOHC engine to achieve a compression ratio of 11:1. I will drive around like this until i can afford low compression pistons, new valves, springs/retainers, cams, forged connecting rods, and turbo kit.

Now to the questions...
Since i want to use my SOHC pistons will i have to get rings for the sohc or dohc?
Do you think I will be able to run 11:1 compression on 91 octane gas or will i have to use 93?
What kind of services should i have done to the engine block before i put everything back together?
Do you think i should get special valves if i am only going to run a max pressure of 18psi every once in a while, or will OEM valves work.
What is everyone's top engine speed while running stock springs and turbo?


That is all I can think of now.

"I will be back"
Gov. Terminator

[Joel 180]

11:1?? id be using avgas!

[DamnedButDetermined]

Originally posted by Joel 180
id be using avgas!


?????????????????????????????????????????????????? ?????????????
What does that mean?

[docrice]

avgas = aviation fuel, airplane gas, whatever you want to call it. it's 100 octane and pretty pricy, problem is it's leaded (low lead, but leaded none the less)...a lot of people run avgas in older cars built to run on leaded fuel

[Phoen_x_s14]

dammm, and I thought my future setup was gonna be complicated...

Hmm lets see... I dunno bout the rings...hmm I'm gonna have to go check back on if theres any diff. from the sohc and dohc on pistons. Might not be any, but I'm thinking since your gonna put it in a Ka24de, you should use the dohc piston rings.

Are you going to be doing this yourself tho? I wouldn't cuz everything has to just about pefect on a engine rebuild, seals, gaskets, etc. etc. Where are you located? you might have a mechanic that knows about import engines that can rebuild it, I dont really trust Domestic Tune shops, their use to V6's and V8's, but who knows.

Always use the best gas octane you can afford. Hell use 93 with octane booster.

But swapping pistons in for high compression, then just change your setup to low compression seems like a waste of time and money. I would just get the engine and swap it in, then get all the parts your gonna use for the turbo; pistons, valves/springs, etc, install it, then the turbo. Unless your really balling, but thats still a waste of time.

as for what you should do before turbo.......
1st off. LEAK TEST!!!
Low compression over size pistons but your gonna have to have your block machined so they can fit. Stage 2 port and polish since you are gonna run 18 psi. The KA24DE was not made or built for turbo, so swap out any part thats gonna be working extra hard or have a lot of stress on it with something stronger. KA24 isn't bullet proof, I've heard and seen alot of people run turbo on their KA24 and some how their engines blow due improper install or other factor. Get it done right the first time. Try to contact XS engineering, I think they make a turbo kit for the KA. http://www.xs-engineering.com/

[d240t2]

If the rings are different, you'll need the rings that match the pistons.

If you are going to go turbo eventually, don't waste your time raising the compression...that rebuild will cost half of what it takes to get the car turbo. Just wait a little longer and save up for the turbo kit.

[DamnedButDetermined]

Originally posted by d240t2
If the rings are different, you'll need the rings that match the pistons.

If you are going to go turbo eventually, don't waste your time raising the compression...that rebuild will cost half of what it takes to get the car turbo. Just wait a little longer and save up for the turbo kit.

I am not trying to argue your point but i don't see how it is going to cost much more to swap out pistons. Here is my reasoning...
when i rebuild the engine I will install the sohc pistons. Then it will take me at least six months to save enough money to buy the valves/springs/pistons/turbo kit. Then when i switch out my pistons and rebuild my cylinder head The only thing I will have to replace in the block is the piston rings. Let me know what you think...

Are there bearings that go between the crankshaft and connecting rods?

Is it possible to connect oil squerters (sp?) to the block like on the sr motors?

[andrave]

dude pistons are like 400 dollars, just buy some when you rebuild.

[DamnedButDetermined]

Originally posted by andrave
dude pistons are like 400 dollars, just buy some when you rebuild.

I already have SOHC pistons in my 90 fastback so i wouldn't need to buy those.

[deviousKA]

i wouldnt reuse your sohc pistons unless they have low miles. there is no point in rebuilding your engine twice if you just want to run high compression for a while then boost. Go buy some z24i pistons and slap them in you ka24de If you are going to do something cheap besides running stock pistons. They will lower your compression and are a direct swap. Do it once then start getting all your turbo setup. It will save time=money.