Ha ha Ha.... I think I get more enjoyment driving along on a good road then against someone (I've the curves)... Even though I haven't gone In a loooong time .. Jeez i need to get out more .. Anyyways this is was a good chat..We should do this again sometime

 

Yeah, pretty informative. I should remember to come back to this and revive it for where I actually get some motor work done on my car once I'm happy with the suspension.

 

I was talking about SCCA Club racing, or road racing. If you want do SOLO 1 or 2, you dont have any limits on what you can do to your car. If you can imagine it, there is a class for it. I would think that a turbo 240, properly set up, and with a really good driver would be capable of winning the SM national championship. A class that is currently dominated by E36 M3's, with very very good drivers.

 

but.. but M3's are scurry!

 

Hell yeah tehy are, holy crap! M3! Damn, time to have KA-Ts bust a cap on M3s now.

 

The best I have seen out of a NA KA was 215fwhp or so...

 

so in short the answer is... you can get 250whp outta a n/a ka motor... i dont know if that fact was lost or not... it all comes down to how big your back pocket is or how many credit cards you care to max out to get to the power level... im the newest 240 owner and i guess i did it right... i bought 2 of them 89 h/b and a 91 coupe... the h/b is for my girlfriend and i just picked up my coupe today...i want to give her as much power as she can handle but when she drove my turbo civic it was a disaster... so im thinking the n/a ka would be a good bet for her... it still needs to be able to hammer down when the time comes but mild mannered enough for her to drive 20 miles to and from work every day...
in the whole thread i read what everyone was saying and i have no side of the fence to stand upon at this moment... i have driven and built both cars for other people but this is the first set of nissan 240's for me... easier to tell people what to do with their car cus it is theirs and not yours... but when it comes down to being your money footin the bills then it gets a little more complicated...
i ordered a sr swap for the hatch but now im rethinking my designs... it goes into mine mine mine mode now...shipping on the motor is 3 to 4 weeks due to a few things i wanted to come with the swap... so once i get the swap and start building both motors and cars i will have a way to judge which car/motor i like best...who knows i might just change my minde once i get to actually drive the cars they way they should have been built...
look out for a set of almost twins on the roads in summer 2005

 

Yeah 250rwhp from a KA is definitely possible... seems the thread shifted more toward "but why" and it gave us some good discussions out of it

 

I think it would be fun to build a n/a ka. turbos are an easy fix for power, although needing to be tuned quite a bit. You got bragging rights tho if u get one running over 220rwhp. I've always dreamed of a na ka that could rev to 7k without getting breathless.

 

first of all boring a motor adds little to no performance increase

new valves or camshafts would do nothing for the power

a widened exaust would make you loose low end torque

a bigger crank shaft is heavier = larger rotating mass = slower accleration

no it cant be done.......................................
....

 

I trust in the KA... i believe (thinking about doing this) in velocitystacked iTBs. =0)

I also trust the sr20det, and believe in HKS =0P

 

How can you say camshafts will do nothing for power? I hope that you are saying STOCK NEW camshafts right?

And as for valves, oversize valves should only be used for highly built engines where it would be a benefit for addition airflow right off the valveseat at the begining of the valve lift. It would do nothing for a stock engine or lightly tuned engine. So this I agree with you.



What I would suggest to make power out of a KA N/A if money is no option, would be to reduce the stroke of the engine to favor a more higher revving engine as the stroke on the KA is long bugger. While you are at it, High compression pistons as well as forged con-rods or shot peened stock rods w/ARP rod bolts should be a must.

Power will come from redoing the head. I looked at a 91 DOHC head I have on my bench and I noticed that I would want to do some sort of porting and reshaping of the ports for more flow, compared to my SR head, the SR head looks like a better design, but until I get both heads on a flow bench, Im just going by my eyes. Gotta install stiffer valve springs for the higher redline as well as custom high lift camshafts to get the power out of the head. Im thinking in the neighborhood of 264~272 duration, maybe even 304 duration if one has the *****.

I looked at the stock intake and I looks like a design more towards low end torque that all out power. I would suggest making an intake like Greddy has for the SR20det or to fabricate a manifold to run ITB to make use of all the flow the newly ported reshaped head can support.

My 2 coppers.

 

N-O-B baby. It's all N.O.B.

 

A lot of people believe changing the intake mani would help the KA a lot. Since the KA is designed for low-end torque, it had long runners and the butterfly valves. However, shorting the runners will help the KA breathe a whole lot better at higher RPMs. As for destrokeing it, I wouldn't go with that because then you're just taking away the KA broad powerband. Redoing the head would help in helping it breathe even better.

 

i was going to say something but decided not to!

ok where to start........ka24de is a great engine! mine is currently turboed, and pulls with a flat, broad powerband all the way to its 7500rpm rev-limiter. when i take the turbo off, it will definately lose tons of power, but i willl gain driveability. now, it does have a very long stroke crank, but this is not necesarily a bad thing. since it has the rod length to make up for it, its still got a good rod ratio of i believe 1.71, which keeps piston speed down which is the major rpm limiter in stroked/large stroke engines. given an unlimited budget, i would go for a broad powerband, bore it out as much as possible, completely re-work the head, add even longer titanium con rods, perhaps a forged, balanced knife edged micro-polished cryo treated crank, as well as having everything else cryo treated and the pistons and combustion chamber coated by swaintech, a custom high lift cam/valvetrain, design a custom itb setup such as one offered by twm, and aim for 8500rpm limiter. however this would just be breathing room, peak power could occur at 8000rpm as long as it had a broad useable powerband! an engine such as this should develope around 240whp, 200+wtq, have a very broad powerband, and be bulletproof.......like i mean racing it for years without so much as a rebuild!

of course then you'd have to build up your transmission as its not built to withstand high-rpm use, and the car wouldnt exactly be street legal either (although it would prabably be perfectly streetable)
-sage