full head job

[240canuck]

if I were to get my head totally tricked out ported polished valve grind cams but keep the campression stock (maybe a little more due to getting the head resurfaced but not much) what kind of power am I looking at with an intake, headers and catback exhaust? what would be the most possible and the very least? thanks boys.Oh yeah its a ka24de in a 92 fastback s13

[I am Technoman]

Well as for bumping up the compression from shaving the head and if you were to have lets say 10.1.01. I gues some were around 170HP including all your listed mods.

[240canuck]

would that be to the wheels or at the crank?

[I am Technoman]

would that be to the wheels or at the crank?

Give or take a few Hp. it would be to the wheels.

[TrunkMonkey]

170rwhp is quite generous with just those mods.

definitely at the crank.

-demetrius

[240canuck]

I was thinking may as well get the intake manifold ported and polished aswell. what would that bring the total WHP up to??? also whats the highest compression i could run on pump gas 91 octane and 94 octane???

[TrunkMonkey]

we can guesstimate horsepower numbers for you all day long, but the only way to know what numbers your engine will pull with these mods is to put it on the dyno when your done.

-demetrius

[I am Technoman]

If I were you I would change the pistons to 89 sohc 240sx pistons. That should put you somewhere around 11.1 CR, and 99 Altima rings. Do the head job and shoot for 200RWHP. Up grade fuel and ignition and use a bigger maff and injectors. Then go dyno the car!

[240canuck]

I think my injectors are leakign anyway so I was lookign to upgrade those to 370cc injectors soon. is there any way to up CR with out changing pistons, ie. shavign head enough. cause i don't want to take the engine out of the car i would like it to stay in the car. also what is the MAf is that the sensor thats close to the air filter housing if it is where can i get a bigger one?? also with 11.1 CR would i be able to run on pump gas?? ie 91 or 93 octane???

[TrunkMonkey]

i could be wrong, but i'm not sure that you can shave the KA head enough to get 11.1 without getting yourself into trouble.

93 octane is the lowest you can go with 11.1 compression.

-demetrius

[JNM240]

Actually, the 89 SOHC pistons (stock 9.1:1 CR) would yeild a 11.6:1 CR, while the 90 SOHC pistons (8.6:1 CR) would give you a 11.1:1 CR.

And no, demcj, you are not wrong. You be taking off waaaay too much material to go from 9.1:1 CR of a DOHC to 11.1:1 by just shaving the head. Check this website out for the formulas (im feeling too lazy to give the explaination in numbers): http://www.holley.com/HiOctn/T...amber

If anyone cares, i am selling the 8.6:1 SOHC pistons out of my engine, complete with wrist pins, rings and circlips, for $75. These would give a DOHC motor a 11.1:1 CR and still be able to use 93 octane pump gas. The pistons have 190K miles on them, but are perfect, although i would suggest you change the rings out.

[240canuck]

very intersted!!! how much to send them up to Canada???Just a question might sound dumb but if i just wanted to install the pistons would I have to remove the head or could the head stay on??? ie could the pistons be taken out via the bottom end??? and also what kind of labour are we talkign about to remove the Ka24de engine from its home in the 240 s13??? how many hours for a shop to do it???

I just don't got enough money right now to get it all done in one shot. If i could get the CR changed first then do the head in a few months it would work out great. Is this theory sound or just dumb???

[Dattebayo]

JNM are they already pulled from the engine? i think i should carry a spare around seeing as how my 9.1's are burning some oil and 118 is killing me. If you include a set of altima rings for me ill give you $100 or $115. email me dude.

[Dattebayo]

wait a min...i dont think those will fit anymore now that i think about it.... oh well.

[JNM240]

I can check how much to ship. Just give me your postal code. About a month ago i tried getting with someone from Vancouver to ship him some springs, but they wanted more to ship them than i was asking for the springs. But the pistons are much lighter and in a much smaller box.

I cant think of how you would be able to install the pistons with the head on the motor. I cant see the ring compressor fitting in the underside of the block. You can get a complete gasket set from http://www.flatlanderracing.com for around $299, complete with new oil pump. If you want, get the pistons now, and save up to either do it yourself or till you can afford to pay someone else.

I really dont know how much a shop would charge to do the entire job. I pulled my engine myself ($40 to rent a hoist), completely dissassembled it myself, then paid a machine shop to take the necessary measurements in order for me to have custom forged pistons made. Then i paid the machine shop to clean up my block and head, change the freeze plugs, bore and hone the block to each cylinder, and change my valve stem seals. In all, it was $390. Then i reassembled the entire engine myself and rented a hoist again (this time $30, ??) and put it back in myself.

If you are mechanically inclined (i am, but have no training and have never pulled an engine before, let alone rebuilt one), i would suggest doing it yourself. Its not THAT hard, but it is difficult and time consuming. If you even think you may want to do it yourself, definately get a FSM. Best money you could ever spend on your car.