ka24e pistons in ka24de

[Snakes]

i was told by phase2motortrend that this topic had been brought up in a thread on this sight. i tried a search but didn't come up with anything. could someone please create a link to that thread. or better yet, just tell me whether it worked to increase the compression ratio and if any further modifications need to be done when you do this piston swap (other than pistons and rings). i appreciate the help.

[Dattebayo]

These are the ka24e pistons you want, and they WILL work, i have done it before. You are gonna have to burn 93 with octane booster almost all the time, though.

here are the part #s for the 8.6:1 SOHC pistons that will make your DOHC compression almost 11 to 1.

12010-30R10 std. grade 112010-30R11 std. grade 212010-30R12 std. grade 3

12010-30R72 oversized 0.50mm12010-30R73 oversized 1.00mm

[nissandrift]

how much horsepower was gained? I'm thinking about doin this also.

[Dattebayo]

It was right around 180 to the wheels with intake, headers, exhaust and a self ported mani. A tuned ecu would have helped alot though. maybe even gotten more power than that.

If you've taken apart a bottom end before, it was not very troublesome. But you need the part numbers for the circlips (one for each rod) and the rings (same thing). You need to have a machine shop inspect your block to see what grade piston you need and if oversizing is needed.

[92s13]

I'm about to begin this project as well. I recently sold my SR swap and am ganna try to squeeze out as much NA HP from another DOHC KA I just picked up.

[Dattebayo]

If you guys have any more questions about this n/a piston swap and all of the mods to maximize power from it, please e-mail me at [email protected]

I will share all of what and how i did everything to the ka24de engine.I can personally thank moderator demcj for all he did for me while i was fooling around with this almost 2 years ago. Thanks demetrius!!!

[Snakes]

These are the ka24e pistons you want, and they WILL work, i have done it before. You are gonna have to burn 93 with octane booster almost all the time, though.

here are the part #s for the 8.6:1 SOHC pistons that will make your DOHC compression almost 11 to 1.

12010-30R10 std. grade 112010-30R11 std. grade 212010-30R12 std. grade 3

12010-30R72 oversized 0.50mm12010-30R73 oversized 1.00mm

please forgive my lack of knowledge pertaining to engine internals, but could you explain what exactly these parts are, and will we need all of them (if not, how will we know which ones we will need)? also, where would i be able to find the sohc 8.6:1 pistons for a good price?

[[Zero-S]]

Junkyard;)

[goomba240]

I wouldnt reccomend getting them from a junkyard. Personal experience.

[Dattebayo]

yeah, totally.go through http://www.nismoparts.com thats where i got mine, and they sell all the other stuff you need to real cheap. and DO NOT go to the junkyard at all. there is usually a reason for it being there.the grades of pistons pertains to the wonderful process of mass-producing engines. since yours and my engines were made on a assembly line, there are small differences in the size of many of our parts. in this case, the size in piston difference is minimal but nessesary to identify so your engine works right.so when you pull the head off your DOHC, look at the top of one of the pistons. try to match the number (GRADE 1, 2 or 3) of what you are ordering with what's in your engine already. If the machinist says differently, you do what he says. The oversized thing is if you need to shave the cylinder walls because of damage, but you could also use this to up your displacement. Do you understand or is there something i left out?

[Snakes]

ok, i understand now. would you recommend changing the connecting rods, too (or are the old ones strong enough for this compression)?

[goomba240]

Just pick up some new OEM rods. They are shotpeened/forged from the factory so they are more then good for the higher compression.

[matt4pl]

so with some AFC work, and a bit of timing adjustment, would this set up be streetable on pump gas? how much would the estimated total cost be to get all the parts, check the block, etc?

[goomba240]

As long as you dont run the really early 89 pistons(the even higher compression pistons) then you should be good on pump gas. My first time doing this I picked up pistons for free from a junkyard(all I had to do was yank the motor and pull em my self) and throw them em and WAM there you go. Of course it threw a rod resulting in a fist sized hole in my block and a dented intake manifold. But I wouldnt worry to much about the block checking thing unless you don't have quick access to a junkyard with a ka in it. I did this for a kid who is running new OEM sohc pistons with new OEM rods for a couple months without a problem.. He always run 93 octane, but I think he has put in 91 here and there. No air fuel tuning or anything. It seems to be goin good and should be good for 180+ rwhp with I/H/E an S-AFC would help out a bunch though.

[matt4pl]

about the connecting rods. are new ones necessary? im pretty sure the stroke is teh same on E and DE. dunno. kinda interested in doing this though. some cams and headwork, 200rwhp seems very feasible

[matt4pl]

one other thing im not clear about... are you guys talking about stock compression SOHC pistons or raised compression pistons?

[goomba240]

Stock compression pistons.. If your goin for high N/A horsepower look for an early 89 Ka. It will give you a 11.7:1 Compression and with Colt cams I/H/E 370cc inj(stock SR) and an AFC with some really good tuning you'll be putting out 200+ N/A rwhp. New connecting rods arent neccessary. But if your goin for even more power look into some new aftermarket rods.

[goomba240]

Oh yeah and it will give ya a hell of alot more torque then an SR too! haha the look on there faces when they say "uhh I gotta GheyDM motor" Im just like Whatever? then afterwards there like "uhh you runnin Ka-t? hell no!! gotta love the good 'ol ka!

[matt4pl]

i can get those pistons for about $40 a piece.... plus the hardware.id get the AFC first though. gotta go do some thinking

[RalphCare]

so how much would all of this cost? cause if i buy a car with a blown head, while im repairing that, i might as well Soch my Doch. LOL.

11:1 compression... yummy..

what do you think it would peak out at with some wilder cams? 7000 rpm? the ka dies pretty quick already.

cause if the rev/speed limiter is the case, i can just rechip my ecu cause i have a 486 computer with a slot which will program AM29 flash-bios chips

and with a zif socket and a special device to control two chips at a time, i can get some good tuning happening

but ROM-EDITOR doesnt have files for the KA as of yet. does anyone have all the files needed to tune KA roms?

[Bronze MFP]

dunno about KA roms, but check http://www.zcontrol.netthe guy there is making free software so you can tune your car through a computer. he even shows you how to make the interface board so you can plug a laptop or something into the consult port. I havn't got mine to work yet, but its probably because I am an idiot... http://forum.ztechz.net/ might be a good place to check for roms, they have a 240sx section.