ka24de crower stroker kit to 2.65l

[Bo Duke]

no replacement for displacementwith the right parts (intake, valves, etc) and programming it should make great power. Of course , as it has been pointed out, it will take lots more $. But thats how it goes in the hp game. Ur choice.

[Ajax]

To let you guys in on the loop:AMS has the engine installed, fired up and are breaking it in. We'll be tuning with an AFC Neo for now, until I feel like I can comfortably afford a stand-alone. Just need to figure out how to tune in Chicago with 93 octane, while MN has 92 at best.

[480sx]

from what i'm told by some engine builders ''easily 8000+ rpms sustained". Its not the KA's engine design that is the flaw. It the quality of the its oem components. the engine could fly apart above 7500 rpms. one plus is it has oil squirters.

There is no flaw, its just a different engine design than a honda man. You dont need to rev to have a good, powerful motor. It IS the design of the crankshaft that limits the Ka's capability to rev. The ka also has a pretty rock solid bottom end except for the cast pistons. The head of a Ka is pretty solid as well actually.

Dont listen to everything an engine builder says, those guys love to talk out of their ***. Most of them have experience with mainly domestics and hondas.

[D-UNIT]

there was a member on here with a fully built KA with a stock crank. He used to get mad when ppl say the KA can't and shouldn't be reved. he'd say "I take my tach needle to 8500rpms all of time". He was making 635whp.

The design of the KA oem components prevent reliable higher rpm operation. Stock rods will bend , piston pins crack off , piston rings collapse , rod bolts break. This will happen even w/o boost. Ur right there is no flaw in running a fully built KA, Because you can throw all of the above out the window.

It has been proven - rpms = horsepower ( cams needed) if you could rev higher why wouldn't you. Don't scapegoat our engines. It can't cuz it can't , come on. Science is on our side. With this stroker kit the strenth will be undeniable. We're talking 30-35+ psi at 8000rpms easy. Do the math.

btw those stupid engine builders , yeah they're my friends and they build 2.2 L 2t/3t's that spin to 9500 and L28s etc. Seems like they have more faith in the KA than you do.


Modified by D-UNIT at 11:54 PM 5/3/2008

[480sx]

The stock ka has proven itself a few times in excess of 500 hp. It also has held 30 psi of boost for short amounts of time.

The Ka has a half weighted crankshaft. Due to this design, any rpm past about 5500 will cause bad crank harmonics and vibrations. These vibrations get exponentially worse as you continue up the tach. The vibrations leech power right out of your motor. In addition to that, the crank vibrations eat bearings alive, causing your motor to wear prematurely.

Im not saying that the KA cant make power up top, im saying its stupid/pointless to try to rev a stock Ka out past 7-7.5. With the way the engine is designed, you make your power between 3500-6500. That powerband is fine for putting down power. Hit 7k, shift, and let the low/mid range of the KA do what it was designed to do.

[D-UNIT]

I totally understand what you are saying but , this thread is about the BC Stroker kit for the KA. It is not about the stock KA. The BC kit comes with a fully counterweighted crank ( bye bye high rpm woes). If you buy this kit without cams that would be asinine. Kinda like buying .500 lift cams with stock springs and locks. Also buying this kit without revving higher is brainless too!! i.e. " stupid bc kit , I only made 20 extra whp at 6500rpm. I wasted my money. WAAAAAAH!!!!. Now I have to tell everyone on the forums its junk."

Harmonics doesn't destroy engines , if it did my engine would have blown long ago. Crappy engine parts that fail from harmonics destroys engines. Every engine has some form of harmonics. Look at hondas , put on solid engine mounts and it feels like the dashboard is going to vibrate right out of the car , but it still can handle 8500+rpms (stock) w/boost.

At that speed a stock KA would literally fly apart , because of excessive piston speeds not harmonics. You see High piston speeds cause rod bolts to stretch which causes spun bearings (no oil). Even higher p speeds would cause the bolts to snap causing catastrophic engine failure. That being said I think a nice built engine should handle what ever you throw at it. The BC kit is for when you need something more.

Built NA : 250+/- hp (high comp) est.BC NA : 305+ hp (high comp) est.

Built Turbo : 600+hp provenBC Turbo : 900+hp est.

[24DSXY1]

If Rebello can build an all-motor 304hp(around 260whp) ka24e with Mikuni 50mm carbs, the BC Stroker with built head should easily pass 300hp(maybe 270+whp). and the redline on the Rebello sohc motor was around 8500rpm...there was one for sale on Guam for $6k! can't wait to see Ajax's dyno!

[Ajax]

keep in mind those Rebello engines are race engines- I don't know what all the specs are, but those figures will be pretty improbable on my street engine. I still have high hopes. Still working.

[24DSXY1]

Ya, not streetable with their 13:1 CR and crazy cam... what CR will your stroker motor have?

[Ajax]

10.5:1- not the most agressive, but shouldn't have any problems while running 92, either.

[yellowcar]

Funny, exactly the same ratio I chose for mine.

What are you doing for an Intake?

[Ajax]

Right now, I'm rockin' stock, which really sucks for upper rpms. At some point, I will be putting in either the xcessive (possibly modified to a smaller plenum-don't need 3L), or a custom manifold, built by a friend.I know there will be some big gains with the right intake. I've ridden in a friends s13 with custom manifold, and we hung with some 350Zs up to highway speeds with almost no other mods.

[yellowcar]

What does the xcessive manifold do to the bottom end?can you still get them?

[Ajax]

They are still available. http://www.xcessivemanufacturing.comThe lower half of the manifold is deleted and the upper half is cut, and mated to a 3L plenum.They also have a ready to install ITB intake manifold setup (does not include ITBs) that looks pretty good. I don't know what ITBs price out at and whether it makes for a good deal, but its another option thats out there now.

[Ajax]

What does the xcessive manifold do to the bottom end?

Or did you mean bottom end of the powerband?I asked them if they've had any dynos on NA apps- they only had positive feedback from the few cars that have gotten the manifold and stayed NA- no dyno.From my understanding (which is essentially what DJSpecpants has told me), the large plenum wouldn't be the best for staying NA- something closer to 1.5-2L might be better for my apps. I'd bet the lower rpms would lose some torque, but the gains up top would be worth it. And coupled with the stroker, a loss of torque probably wouldn't be noticed much.

[Reno]

bump?

[neverlift]

any numbers

lol so djpants is still around.yeah he is the manifold theory guy for sure!I had plans to make a manifold for my sohc then it blew dohc is a pita to get the manifold on/off with the motor in so I wont be doing any custom manifolds for this motor lol.

Also are you doing anything as far as crank scraper or getting some oil off the crank for that extra 500 rpms?

in my head the b/c kit with scraper and an ati fluidamper would let a ka rev fairly high, I'd also have a lightened flyhwheel in the mix to make it all easier ofr the motor to turn....

any specs on weight savings(internally) from stock to bc kit?

[Ajax]

I hadn't check about weight savings with the BC crank- I imagine most of it is in the rods and pistons. A crank scraper would need to be custom, so I didn't get one.I already had a fidanza flywheel (since 2001), and got a Fisher Concepts damper.On the BC stage 2 turbo cams (little overlap), we only hit 160hp, but 170lb-ft of torque. AMS is currently doing some research to figure out which cams will be best suited to open up the top end. I see no reason why the right cams and custom manifold wouldn't see a huge increase in high rpm power- DJpants' coupe (before it died) would really scream.

[24DSXY1]

I don't know if it's been posted already, but PDM-racing made 177whp & 182wtq with only an injen cai, dcsports header, 3" megan cat-back, and ecu tuning. There's a dyno chart in the news section of PDM. They said the ecu tune alone added 25whp! This was done on a 250,000 mile motor with all stock internals. I can imagine if they built the head and throw in some high comp pistons it'll break 200whp easily!

They must also have a really bad driver cause they only did 15.0@90 in the 1/4... maybe no traction in 1st and 2nd?

[Ajax]

IIRC that was on race gas, hence the huge increase with ECU tuning.

[tramp_drift240]

more info on the stroker kit.

im noticing a lot of topic-changes going on in here.

< wrecked the black coupe, about to get a red coupe, rebuilding my rebuilt DE again to swap into the red one and considering the BC kit.

[Ajax]

Well, I should be picking up the finished car around June 10th. AMS is researching to see if the BC V3 will have enough clearance in the head. We'll dyno then and see what we've come up with.2.6+liters, 10.5:1 compression, AMS race head, AFC NEO and JWT ECU (full stand alone will have to wait for a while- I'm about broke)

[Ajax]

V3s do fit.As for the stroker vs the oil squirters. They do interfere- you need to either delete the squirters, or machine them to fit (AMS did the latter).As for the results, we're all a bit disappointed and mystified by the 160 peak hp. Torque peaks about 160 as well and never falls below 130. However, I think these results may be misleading. I haven't really flogged her yet (too many parts floating in the back, and it needs to be re-tuned to 92 octane), but it feels stronger than it did before when it made almost 170 ft-lbs and just over 170 hp(granted this has been a long build to be doing butt-comparisons).A better intake manifold is a must for this kit, and is in the works. I would not be surprised to see improvements in the 20-30hp range on the top end.

[tramp_drift240]

throw a snail into the mix and youll be mystified by the outcome.

[Ajax]

a blown engine?.. with 10.5:1 CR, I probably couldn't get much more than 4psi of boost- and that would be touchy.

[yellowcar]

Thanks for the info on the squirters! you don't by any chance have pictures of the mods they made do you?

[Ajax]

Sorry, no.

[Silvia14b_TX]

I was looking at that the other day. It seems worht it

[D-UNIT]

a blown engine?.. with 10.5:1 CR, I probably couldn't get much more than 4psi of boost- and that would be touchy.

nah dude. you would be all right with the right tuning. My honda (yeah I know) has 10.8:1 CR and it has been running 7.5psi on the stock internals w/ fmu = crappy tune for a about 7 years on 92 octane. No problems. With that monster engine of yours I think 20+psi is not out of the quest(ion), w/ the right snail.

[Mudvayne]

hay ajax have you got the engine dynoed yet