ka24de crower stroker kit to 2.65l

[Ajax]

Look up a few posts- 160 peak hp and peak tq. I'm still betting that a better intake manifold will make a huge difference because the engine just can't breathe past 4500 roms or so. I don't have a scanner, so I can't show the chart. The throttle response is amazing though. And I got 30 mpg driving back from Chicago!I hope to get some sort of manifold done before the end of summer, then get it retuned for the gas available here in MN.

[Mudvayne]

i was exspecting more. how much nitrous can it take. 4000$ for 25 more horses sorry to say it but that was kind of a waste hopefuly the intake adds more. you better boost it thats what stroker kits are for, or at least nitrous

[Ajax]

We were all hoping for more, but I really think that at this point, we're severely limited by the desgin of the intake manifold. Ultimately, I think an ITB setup on this engine would be badass, but that's another chunk of change that I don't have right now.Bottom line, the engine is pretty darn strong, and I think there is still more power to be found.

[Mudvayne]

how much did you spend in all

[Ajax]

Well, Stroker kit is $3000 or so off the bat. add cams, AFC Neo, AMS race head, and parts list is already hovering around $6000.Yes, this is very expensive and I'm sure there are a lot of people that will say "Damn, I could have built a 500hp turbo engine for that much" etc. I really don't care. I spent the money because you can't find a car like this on the market anymore- sub 3000 lbs, RWD, 30mpg, sub 7sec 0-60, and a practical hatch.

[ss82480]

More power to ya man. Everyone says go turbo, I just tell them to piss off I like N/A. I'd love to see some numbers on this.

[Mudvayne]

at least give it the bottle i think you will make 250+ with a little shot of nos

[Ajax]

Hope I didn't seem like a pre-emptive jagoff. I've just encountered a lot of people that bite your head off because they think its not worth it to go this route. And there is some truth to that, if you're looking at pure numbers.I'm hoping that at least by next spring I'll have gotten the new intake setup and re-tuned, as well as some interior stuff done to make this a real driver's car. I will try to post a full dyno at that time.

[D-UNIT]

I was just wondering when you dyno'ed , what was your cut off rpm?

[Ajax]

I'm not sure off-hand, but I think it was 6500.

[liquid_cool]

Well, Stroker kit is $3000 or so off the bat. add cams, AFC Neo, AMS race head, and parts list is already hovering around $6000.Yes, this is very expensive and I'm sure there are a lot of people that will say "Damn, I could have built a 500hp turbo engine for that much" etc. I really don't care. I spent the money because you can't find a car like this on the market anymore- sub 3000 lbs, RWD, 30mpg, sub 7sec 0-60, and a practical hatch.

im currently workin on a 10.5:1 kit myself..im not taking it to a shop so im savin all the laber cost..so far with kit and cams its about 2k..that doesnot include the cranck work thou...im not going to turbo even thou i have a t3 on the floor of my bedroom i keep kikin around in the middle of the night...im really interested in the N/A build of this block..after inspection you can see there is a whole crap load of potential...like i said..im stayin N/A..10.5:1..and i will be advancing the cams 5degrees for lower end responce.

[racersonly2004]

it is often a miss conception that when you stroke a motor you loose 100s of rpm in all motor. but ill tell u from experiance that u only get those kinda changes in motors that dont have ohc especialy since there usually not high reving motors in the first place. all ohc motors have the potential to rev high think about it... the ka has a factory redline of about 7000 and from the factory it coms with 96mm stroke the 350z wich incase u didnt know is a v6, also has ared line of about 7000 but its stroke is only 81.4mm how come there red line isnt 1000rpms higher than the ka. the kas hp/tq is held back due to the way the cams are timed from the factory, and only because they where built for low end torque. has nothing to do with the stroke of the crank. if u want to change the hp/tq range u must change the cam timming. however if u want any ohc motor to redline higher safely you should consider dual valve springs or higher tensioned springs to prevent valve floating and probably titanium valves so they wont brake from the stress. but with higher tensioned springs u will dfntly need titanium. any ?s

[480sx]

You can rev that motor out man, thats how you make the power. The BC kit isnt just a stroker kit, its a FCW crank kit too. This means, the engine WANTS to make power up top. I have an article with a Ka thats got a 300 hp FCW crank build that revs to 10000 rpms and hit 300 hp.

With your fully built head you can rev that sucker out and you will love the results. Atleast hit 8500, i would say thats a safe rev limit for that motor.

[Ajax]

I think AMS did not continue revving because it was no longer making more power. I think its pretty clear that the intake mani is the limiting factor here. Its been something quite a few of us have talked about for the last 2 years. I've been in DJspecpants car with custom intake and minor cam tweaking, and that car hauled.As soon as my budget returns to semi-normal, I will be working on a new intake setup. Hopefully before the end of the summer, so I can enjoy it a bit before putting it into storage for the winter (Minnesota sucks!)

[liquid_cool]

i agree ajax..the more i get into my build..the more i see the intake manny is the most limiting factor of this engine..there seems to be no reason you cant get more out of such a good block like this one...im trying to do a simple (not flashy) work around with a frieind..i will post pics of it on my myspace page when done.

myspace.com/liquid_cool_ka24de

[DroptopDrifting]

so ajax, any news on the build? more specifically the intake mani.i'm thinkin about doin the stroker kit with 11.0:1 compression, the xcessive itb setup, and a build race head with v3 cams. should be interesting, especially since i already have an alum. flywheel and driveshaft, msd sci-l ignition system, and suspension done. turbo is getting boring, i want more punch when i exit turns, no lag. lag sucks. anyone wanna buy a t3/t4 50 trim setup?

[mike_belben]

there is a lot of REALLY bad "tech" in this thread and i hope none of you are taking too much of it to heart.

few things. harmonics do spin bearings.. you run a solid pulley on a street strip car and on the next teardown the bearings at the pulley end are looking crummy while the ones at the flywheel end are in much better shape. because the diameter of the flywheel does a better job of countering the crank's torsional fluctuations. switch the an ATI or Fluidampr and next season the pulley end bearings will last twice as long.

about RPM, you guys are talking about stroke, but not about rod ratio. mean piston speed, acceleration rates and sidewall loading are dictated by rod to stroke ratio, not simply stroke.

the reason torque peak ("powerband") drops for some guys doing strokers is that they are using stockish top ends and running out of air. a small diameter intake runner with a large displacement bore to fill is under a lot more vaccuum and airspeed in the port goes up so high that it hits sonic speed and flow dies.. the port is choking at the valve seat curtain because the air is moving through it faster than it can remain in an orderly column. think extreme turbulence.

more cam will help mask it, but its a bandaid if the port dimensions are whats causing the excessive airspeed. another thing is intake manifolding. going to shorter, fatter runners with a larger plenum will further bring the velocity back down into a sustainable range.

cam timing is another.. the increased displacement requires an increased amount of time to fill.. if you shut the intake valve at the same time as you did with the smaller displacement cylinder, how can you fill the bigger one as full? you cant. gotta wait longer to close the valve (retard intake cam) or you will be shifting your torque peak down lower in the rpm band.

ive been around 680 inch dart motors with as much stroke as KA's have deckheight. and ive seen them make power to 9500rpm, so saying stroke kills top end is definately false. there is more to the puzzle.

[Ajax]

I'd forgotten about this thread.Car is still in storage until April (MN winter...)I've got an Xcessive manifold on order, but they were out of stock. It should be on its way soon. Then I'll need to retune.I'm currently doing some suspension and maintenance stuff while its sitting in my garage.

[DroptopDrifting]

nice nice. yeah i'm just accumulating parts over winter. i don't have a garage to work in, and i cant work in snow, so all work has to wait for like april as well.

dont forget this thread, i'm really interested in your build. not many people build for a more responsive setup. we should setup our own category on here heh

[IrenicShogun]

Have this kit. Have not had the time to put it in. HP gains should be about 40.

[liquid_cool]

MIKE:...please elaborate in more detail about your comments with some charts to teach us more about engine statistics in this forum..would be helpfull and possibly make a good sticky in the future.

[480sx]

Id stick with the stock intake manifold, your going to lose a lot more hp through out the curve than you'll ever gain up top with the excessive manifold.

If you tuned this thing out and ran say, E85 it would be a beast.