How much hp can i with replacing the internals?

[brandon11130]

I am thinking of rebuilding my ka24de and i am just wondering how much hp i can get by replacing the valves, valvesprings, pistions, pistion rods, camshaft, pretymuch everything i can find stuff for, of course copled with air intake full exhaust performance chip spark plugs,spark plug wires and distributer. So pretty much a complete NA engine build up how much hp do you think i could pull 200? 250?

[98s14inaz]

You might be able to hit 200whp with high compression, balance, i, h, e, cams, ecu. Then again you might not. I haven't seen one yet.

[brandon11130]

im getting most of my stuff from supertech (ka24de.com) i think im gunna go with 9:1 coated pistions, new valve springs and retainers, Stainless Steel Black Nitrided Intake valves, billet connecting rods, and does anyone know of any good camshafts for the ka24de?

[98s14inaz]

Well if you go 9:1 you are going to lose some lowend. You only should do that if you are boosting. As far as cams go I really like the s13 cams in my s14. The s14 has 232 232 duration vs the s13's 240 248 duration. My friend Jeff did a before and after Dyno with the 232 232 and the 240 248 on his boosted KA and got a 25whp increase between the two. The bigger cams you see advertised are good for topend but your lowend will suffer. Believe me we have spent some time on the dyno and have verified this.

[250sx]

through carburetors, prob 280-300+. through efi, I dont know. prob close to that if you could tune it.

[ArticDragon192]

What year KA. IF it's an S13 KA, then he'll be upping his compression since it's like 8.6:1 or somethign like that. For teh S14 KAs they upped the compression but made the cams conservative. While you're rebuilding the KA, have it fully counterweighted in order to handle high revs.

[:: orion ::]

What year KA. IF it's an S13 KA, then he'll be upping his compression since it's like 8.6:1 or somethign like that. For teh S14 KAs they upped the compression but made the cams conservative.

Blah...close.

Early '89 KA24E = 9.1:1Late '89-90 KA24E = 8.6:1

'91-98 KA24DE = 9.5:1

- Brian

[Red coupe]

new internals wont nessisairly change the power, it all depends on the the design and combination of parts you instal, things like valve springs and valves tend to be for solving problems because of the power being made, not making more power, in fact stiffer springs unless nessisary to keep valves closed are only going to increase the energy it takes to turn the engin over. pistons like what you listed are mainly ment to deal with stresses of a higher hp engin, not make more power themselfs... I would look for pistons out of a 89 ka ( create high cmpression when used with a de head), get a stronger spark(like you said new wires, distributer and coil), port and polish the head, i/h/e, research cams and find one that would be apropriate (not as easy as whats the best cam different overlaps and durations suit differnet needs) and maby some ecu tuning would probably be easyer then all new internals, and would be more helpfull imho

[brandon11130]

i am planing on boosting, so you think the 9:1 will be ok i plan on instaling the s14 ka24de greddy turbo kit, by the way i have a 1991 so i belive it has 9.5:1, does that sound good, what would be a good bost to run with this set up? sorry if im a little behind on this stuff im only 15

[brandon11130]

really, i could use ka24d valves, i can get some of them for free, will they fit rite and everything? thanks for all the help

[brandon11130]

GRRR use the pistons i mean, why pa4 400 bucks for 9:1 when i could get some 9.1:1 for free

[250sx]

theres a big difference betwn forged aftermrkt and stock pistons. Chances are, people usually get greedy with boost/nos and start to melt parts like pistons, any piston can melt if the engine doesnt run right but aftrmrkt forged usually last longer. I would pay for forged pistons. Maybe just coat the stock pistons??

[250sx]

sorryy, I was under the impression that you wanted max NA power, that may not be the best setup when you start to boost. you can pretty much change everything in the engine but the cams, and compression will be drastically different btween NA and boost. Now we know you want to boost....feel free to get a forged fully counterweght crank, longer rods,coated pistons,ti/stainless valvetrain and some nos/turbo cams.

[ArticDragon192]

89 Stats:http://www.socal240sx.org/faq/1989.html91 Stats:http://www.socal240sx.org/faq/1991.html95 Stats:http://www.socal240sx.org/faq/1995.html

This shows my info is right.

[Red coupe]

I know nothing about turbos, and less about turbo KAs, go read through the KA-t section, with stock internals and proper tuning ive read that the KA can run some were around 6 pounds of boost safly..but like I said I realy dont know what im talking about when it comes to FI. BTW i dunno if you relize or know the difference but you posted in the NA (naturaly asperated, non turbo/supercharged/NoS) forum,Try here http://nicoclub.com/zeroforum?id=170

[BadMojo]

I know nothing about turbos, and less about turbo KAs, go read through the KA-t section, with stock internals and proper tuning ive read that the KA can run some were around 6 pounds of boost safly

You can run a lot more than 6psi. Ivan in the KA-T forum got about 400hp to wheels with *stock internals* and really good tuning before his ring lands died a painful death. I believe he's somewhere around 500hp to ground now that he's got a built engine.

BTW, you'll probably find the Greddy kit to be both expensive and disappointing from what I've read.

Anyway, like Red Coupe said...try the KA-T forum. Lots of good stuff to read in there.

[brandon11130]

i was going to build it up first then turbo it eventually. but from what im hearing it seams that the stock internals will do just fine if i am planing on turbo, but i would feel much safer having the internals replaced on a count of the engine has 90,000 miles and still runs, even if i dont put all performance parts in it i may just have it rebuilt to stock specs, or while its open just have new stuff put in? what do you think? sorry im such a noob

[Red coupe]

see the thing is witht he internals your realy need to be buying stuff that is tailored twords what you are trying to accoplish, it would be very counter productive to try and build up a good NA powerplat temporarily and then turboing it. If I were you I would get intake and exuast and save all your money and progressivly by turbo parts, 90k miles isnt to much, Ive heard people say rebuild for turbo only if its over 100k but it realy just depends on how well its been taken care of. I would read alot before starting to do a build up like what your talking about, just hang out in the KA-t forums and try and learn all you can, search on googel, and this site and dont be afraid of asking questions(after you cant find the answere by searching). If you can take a class on engines at school although I dont know howmany classes they offer in highschool on engins. They are increadbly complex and it isnt as simple as just swapping things out, good luck with the car, and try to be responible with all that power, turns out that 27 hundred pounds of metal can do some damage if it gets away from you.

[brandon11130]

ya but at 90k i dont know, might just try to find a used 91 or up ka24de with 30-60k miles on it i could get one for about what it would cost to have it re-built and then just turbo that. now im getting somewhere!

[NateDogg]

I hope you dont take this the wrong way but a normally aspirated 240sx is enough to handle in wet conditions.

Trust me I got a 240sx when I was 16 (now 21) and I'm glad the car didnt have any more power than it had otherwise I woulda gotten myself killed or worse. 240sx is a fun car anyway and you can mod other things than the engine to make it a better car.

When you have a couple years experience driving in wet conditions and have learned the techniques I'd say come back to the forums, do some research and learn before you burn.

Good luck

[keepingthe240]

Whats the specs of the 91-94 cams and the 95-98 cams? Are they 240* intake/ 248* exhaust for the 91-94 232* intake and exhaust for the 95 and up?

[corn322]

those sound right

[onosqv]

I hope you dont take this the wrong way but a normally aspirated 240sx is enough to handle in wet conditions.

werd, 240's aren't the best road huggers in rain, haha - good/bad depends on the person. I've had my car for about 4 years also, and it took a lil while to get used to the handling.

Anyway, like the other posters said, learn your car handling stock first.

Also, if you build NA, that will be counter-productive toward turbo/nos. The two types require different tuning/specs on the internals.

1 example that happened to me: got high performance cams that overlapped a lot, did great for the NA. Found out if I put in w/ my turbo, car will underperform, or may not start at all - overlapping valves is bad for turbo but good for NA for scavenging effect.

There are many other examples of this situation.

Some advantages of building up NA is that it is more sleeper and has a much smaller chance of having to go to a state referee if a police officer pops your hood .

[ArticDragon192]

True, the tuning of NA and FIU are different. Like brokeAs240 said, the cams are different. Compression will be too. FI engines like low compression while NA engines need high compression to make power. You can have a compromise in compression though. Do your research first.