stroking the KA...haha, get your mind back to cars!

[ca18deTbeGinNer]

would it be better performance wise, to stroke the SR20det to up the displacement...or stroking the KA for more displacement and then put a turbo on it??

[MidWest240Collector]

It's pointless to stroke a KA. Even if you stroke a SR it's still .2L behind the KA. That is why the KA>SR

[:: orion ::]

Pound for pound, it'd be better to slap an LS6 under your hood and have 400rwhp with no power adder...but...

Stroking an SR is good, but big $$$...for the same investment, you can fully build a KA and be better off, IMO.

Stroking a KA...Bleh. Worst. Idea. Ever. The KA's stoke is already too long..and you gain so few cubes by stoking, and lose so much RPM...forget about it.

- Brian

[Structure240sx]

be better off destroking the ka to rev to 9k, if you have good enough flow to make power that high

[Chezedik]

Why not just bore the KA to square it up?

[HolyShiznit]

Wow.......

I am going with Orion on this one. If I had to do it again I think I would just slap an LS1 in there. Heads/Cam/longtubes/tune. Just a tiny bit of spray for when you want straight line fun. Only reason I wouldn't go LS6 is because it's quite a bit more expensive than LS1 motor-set.

LS series > KA > SR

[WDRacing]

A 2.2 destroke with a 9,000 rpm redline would be pretty sweet. Lots of machine work and a whole new valvetrain, not to mention a better intake and turbo that will flow enough volume.

Expensive, but it would be awsome.

I'll take 2.4 and 8grand. Way cheaper...

[jollygreen]

what's your opinion on a 2jz in a 240?

[Chezedik]

Why not just RB25, it would be cheaper, and the same displacement unless you are using the USDM 2jz, then good luck finding one.

[Structure240sx]

all about the 1.5l scion motors, i hear people in new zeland are making like 850rwhp off them

[jollygreen]

i thought all 2jz's were 3 liter and the 1jz's were 2.5 liter.... it wouldn't be that much more expensive then a rb25 and they can handle a lot more hp stock

[WDRacing]

The 2JZ is without a doubt one of the best motors ever built...period. Not even worth arguing that one. I'd rank it right up there with the RB26DETT.

[klattr1]

good lord foreign-motor crisis lol.

[WDRacing]

Get crazy original and use the FJ20DET. Its another Nissan DOHC motor that loves to be revved. Very rare...I somtimes think of going that route myself, just to finally do somthing different.

Or the always 2JZ stomping RB30DETT. I haven't seen this one stuffed into a S14 stateside yet.

[ca18deTbeGinNer]

so would any of those motor fit in the s13 chassis?? im pretty sure there would have to be alot of customizing for mounts and all that...is there a shop already doing that for an ls1, 2jz or that fj20det motors???

thanks for the comments guys.

[hannibal]

I spent some time looking into a destroked KA. A KA20 is sold in the JDM Nissan Caravan. Its got a 86mm bore and stroke just like the SR. With a 90mm bore and the KA20's 86mm stroke, you'd have a 2188cc KA. I havent been able to find more specs on the KA20 (like deck height), but I assume its as simple as dropping the KA20 crank in a KA24 block.

[kirk]

OH SNAP!!!

http://members.shaw.ca/kfgroup/240sx_-_2jz.htm

[hysteria]

well that's cool.i know the rb26 is a bad *** motor but everyone i have ever seen with one has $$$$$$$ because they are constantly tearing it down and rebuilding it for more more more.but i mean what the hell... as if 600hp isn't enough anyway. but no arguments here 2jz is a bad mother. and so is the rb26. read that post carefully... " don't dream of 800+ hp if the only thing you have driven around is your moms chevy cavalier..."i think that advice should be taken by, oh, just about 90% of the people that have ever posted on these boards. maybe more.the stock offering of either one of those straight 6's would be enough for most people, depending on what chassis you mate it with. of course given they have an interest in learning how to drive it to it's potential. and i don't mean straight line potential.

[ca18deTbeGinNer]

OH SNAP!!!

http://members.shaw.ca/kfgroup/240sx_-_2jz.htm

do you guys sell the mounts and everything to swap in a 2jz?? and talking about stock forms, which performed better?? the rb26 or the 2jz??

[fabio420]

I love Nissans and am a nissan guy so it hurts to say this but, the 2jz is ALWAYS a better than the rb26. stock, built, abused, whatever. The 2jz is a better engine. But the cars from nissan (i.e 240sx, skyline) are better than any car toyota makes

[Chezedik]

THERE IS NO KA20. It comes from using the Z24 crank in the KA24. It is supposed to bring the engine to 86*86, I believe. And yes, I am sorry, it is the 1JZ that has the lower displacement, but I still think it would be easier to get then the 2JZ. Also, if you are going to go to that much trouble, just live the dream and get a VH or VK.

[hannibal]

Yeah you're right.

You just drop a Z24 crank and 86mm pistons in a KA24 block to make a KA20. Some say the 3mm increase in piston to cylinder wall clearance is an issue, so they just fill in the gap with toothpaste.

[deviousKA]

There is such a thing as a ka20de, domestic japan only.

You cannot build a realistic destroked rotating assembly using a ka24 as a base. Learn some more about rotating assembly theory and design and you will understand why. Ill give you hint, deck height.

A rotating assembly must be designed as whole, you cannot change a single variable and expect good results, its not all about piston speed. You must start from the ground up.

Edit: And btw, z24 is the ka24's primary ancestor, it is 89mm bore x 96mm stroke. The only differences in the crankshaft are the journals which are approximately .080" wider, and the larger diameter snout.

[Chezedik]

When did they make it? What models? I read it off some website, I guess they were wrong, since you would have to cut the crap out of the journals or open up the rods (of the KA).

[deviousKA]

It was made for the jdm nissan caravan, like IWannaS15 mentioned. I think it was also used in some other small utility vehicles in japan, commercial type.

Destroked or "hybrid" KA has been discussed, there are ways to accomplish this. Im not going into any more depth on the subject, I have many times before.

[hannibal]

I know devious has probably looked at this more than anybody on NICO. Here's an old FA thread about destroking.http://forums.freshalloy.com/u...hread

Hey devious, are you esporque in that thread?? He had a hybridka site a few years ago...

[Jeff240sx]

It was made for the jdm nissan caravan, like IWannaS15 mentioned. I think it was also used in some other small utility vehicles in japan, commercial type.

Destroked or "hybrid" KA has been discussed, there are ways to accomplish this. Im not going into any more depth on the subject, I have many times before.

If there were "many ways to accomplish this" then there'd be more destroked KAs. Or... one destroked KA that's verifiable by the 8500rpm dyno chart, not just some guy claiming that's what he has.As far as I know, the Z crank got shot down, SR doesn't work, and the only way to go about it is getting a custom crank. Crower will make a set of rods and a crank for $3k that would destroke the KA. Other than that... I'd like to see proof that it's been done.-Jeff

[WDRacing]

WAY better off just doing a motor swap. Or just building a bullet proof KA, you can make it rev to 8500, it will just take alot of work to do it. Balance analyzing is key. All the formula one motors of every make started off a regular block and rotating assembly. Then they are ported/polished/balanced/lightened until the desired result.

[Chezedik]

That post was a constant flame, what did it prove. It proved that it can happen here. As it is not my intention, nor has it ever been to lower the displacement of the KA, I am not going to argue this fact. You guys clearly know more about it than I, I was just offering up what I read on the very same sight of asad's.

[deviousKA]

Like I said, the ka24 block is of no use. Physically fitting a modified fully counterweighted datsun crankshaft is not really the issue, its the fact that the block is 247mm tall, you cannot design a proper rotating assembly using stroke of 86-88mm with that deck height. You must work with a medium deck height datsun block of 227mm.

I have been working with these for years, hence not giving away detailed information that I worked to figure out. I dont really mind you guys saying it is impossible or hasnt been done

That old freshalloy thread has no viable information, and no i did not post in that discussion.