9000 rpm KAT topend????

[CrypticScorpio]

hey guys if i did these mods to a KA-T could i safley rev to 9000???zerothread/222395 (sr20det 9000 rpm thread)

i was just wondering cause the ka has a stronger bottom end then the sr.. but the sr does have a stronger head( i havent heard of as many sr's warped heads then i have ka's)just want your guys opinion

FYI the parts shown in thread are also avail for KA24DE

[S13xCrazy]

i was just wondering cause the ka has a stronger bottom end then the sr.. but the sr does have a stronger head( i havent heard of as many sr's warped heads then i have ka's)just want your guys opinion

Although i don't have an answer for your 9000RPM question, i do have a comment on the warped heads.

You probably don't hear so much about SR warped heads because you tend not to hear as much overheating with SRs. People with SR's usually have the tendancy to FIX an overheating problem ASAP after it starts, where as a lot of KA nubs/women tend to not realize how bad overheating is for the car.

also, most heads tend to warp once in their lifetime. once they warp once, they usually harden to where they wont warp again.

just my input/knowledge on it.

KA love baby. treat her right, shell treat you right.

[Crazyirish]

The KA's 13mm longer stroke would be the big challenge to overcome. Even moreso that the head I would think.

[480sx]

In a mag i have theres an article about a 300 hp 10000 RPM limit NA ka. Its very possible to get a 9000 redline ka. You just have to build the crap out of your head.

The thing is though, KA's have a half counter weighted crank, which doesnt really do well at high rpms. Theres a lot of crank vibrations that will rob your power and eventually eat up your engine. If you really wanted to get the power out of your heads you would need to get a FCW crank.

Also, IMO im not sure SR wins for the strongest head thing.. Rocker arms on a SR are the first thing to go resulting in serious engine dammage at high rpm high HP.

[CrypticScorpio]

thanks for the info. keep it comingand installing rockerstoppers saves that problem.its just that i want to build a turbo that can reach 9G revs safely so im wondering should i go KA or SR... ive heard the ins and outs to either debat is better so i just want to know. what one will take more drag abuse before breaking and what one can i boost higher before i hear BOOM!. a friend of mine ran an SR with 20IBS of boost(for 5 months if u can beleive it). ran sweet till his bro overrevved to 9G and blew the head(second gear doing donuts then took on a straight for a few minutes to hear it scream... why he didnt shift.. no one knows).

[S13xCrazy]

^^haha damn.

i don't know if you have seen the thread, but we have a member pushing 25lbs of boost and over 500hp if i recall correctly.

on STOCK INTERNALS and REUSED headbolt's.

[drape123]

^^haha damn.

i don't know if you have seen the thread, but we have a member pushing 25lbs of boost and over 500hp if i recall correctly.

on STOCK INTERNALS and REUSED headbolt's.

Amen to that, i got a bottom built KA-T (stock head, 91 cams) i run 32psi daily now on e85. the stock head can go to 7500 rpms easily but you start to loose power after 5800rpms.

anyhow with my setup, and slicks (that i run daily) i have yet have a STREET car beat mine. i have beat z06's, twin turbo 350z's, numerous sti/evo's and a dodge viper.

so you dont really need to rev it up to 9k, with a nice port/polish, bc stage 3 cams, ti retainers/springs you can bump it up to 8/8.5k rpm and be fine!

just my 0.2

[CrypticScorpio]

shoot me the link please.for some reason theres so many BS threads on here searching can take forever.

[S13xCrazy]

zerothread?id=284262

[GTR PrYdE]

I don't think AMS has hit 9000 rpms on their KA-T so...But I could be wrong, I do remember Ivan saying on the dyno they were revvin to around 8500 rpms. Fully built EVERYTHING though.

[RBbugBITme]

9000rpms puts mean piston speed up near 29 meters/second which is seriously pushing it before even factoring a number of other issues.....

Go for it though, see what happens. Live and learn I say!

[nissanfanatic]

^^haha damn.

i don't know if you have seen the thread, but we have a member pushing 25lbs of boost and over 500hp if i recall correctly.

on STOCK INTERNALS and REUSED headbolt's.

Yea, he's around here somewhere...

But it was only 496whp.. Although, this weekend, I ended up running 2 bar(29psi) for most of Saturday night.. So whatever that is in power...

[WI_S14_Goldie]

One of the main reasons why the KA can't rev high is because of the crankshaft...(not fully balanced)

[S13FX]

One of the main reasons why the KA can't rev high is because of the crankshaft...(not fully balanced)

Someone already mentioned it in this thread hehe, not hard to get one fully counter weight though.

Also, if you ask me I don't think the problem is getting the KA to 9000 RPM, I think the main concern is making power that high up.

I was able to take my KA to 7krpm easily, problem is it quit making power past like 6300 something heh.

So ask your self this question is it really worth taking the risk, by taking your engine to 9k rpm, for no reason at all?

Now if you do find power thats worth reaching for up there, then by god take advantage of it.

Cause I sure *** hell would love to see something about the 300hp 10krpm N/A KA, that be sweet .

[Zippy69]

Hard to hit 9 grand between redlights anyway, but dang it, I'm gonna try!!!

[nissanfanatic]

I'd like to have an 8000rpm limit. I make power right to 7K as is..

[jbracy7]

at 6500rpm my torque curve drops like a cliff.so i cant imagine 8k let alone 9k.a ca has better top end but no torque in the low sooo

[480sx]

When i get some time ill dig through my mags and see if i can find that artical, it ALMOST had me wanting to build a NA Ka.

Its a cool artical too, came out of a really old.. sigh.. Super Street... lmao, everyone was young once...