Not sure if anyone has done this to a KA altima yet

[Importroller]

I was reading up on the DOHC head swap to the SOHC block in the 240s to gain a 11.2:1 compression ratio, and I have been told that it puts the engine somewhere near 190hp at the crank N/A. Now, i was curious, if this would work with swapping the S13 SOHC piston heads with some good rings into our blocks and gain the same kinda power? and i think if you wanted too, you could get KA24E fully forged heads for less than the KA24DE piston heads. Just curious if anyone has tried this, or knows if it would work. I would like to try it, but I dont have a second car to drive now to attempt it to allow for any downtime

[Asleep Altima]

wont work for a simple reason - where would you mount the distributor? it would sit where the alternator would normally sit on the fwd ka. there isnt a provision for the fwd ka distributor on the sohc head either... im sure there are others, but that reason alone would make it a difficult swap.

[00_Altima MD]

good call

[Importroller]

not a swap, just putting the KA24E piston heads and rings in our KA24DE block.

[Asleep Altima]

the head is the problem though, you have to look at one physically to see what i mean.

[Importroller]

from what I have been readin, it can be done, but you need to put different bolts in because the RWD is a true truck motor setup, and the FWD isnt, so they move a lil differently, but the distridutor shaft wouldnt get in the way at all.

[Asleep Altima]

well, see the distributor in this pic? notice how it comes off the end of the head?and then look at this onethey are two totally different animals. i dont think it would be possible in an altima setup. maybe im overlooking something, but the accessories are just in the wrong positions.

[Importroller]

you are overlooking what Im talking about. we arent talking about swapping heads, only the piston heads, not the engine head. this is the info I was talking about

Oh and everyone, btw: If your putting ka24e pistons in your ka24de with the de rods, be sure to get the 240sx/stanza pistons only. These are full floating 21mm pins with retainers, same as ka24de. Ka24e truck engines have press fit pistons with no retaining clips and different pin tolerance (will not work without truck rods).

[Asleep Altima]

there is only one piston head on a four cylinder. its that big aluminum thing under the valve cover. so yes, if you are talking about a piston head, then we are talking about the same thing... piston head and engine head are the exact same thing... i think youre confused just a tad.

[Importroller]

doesnt matter the terminology you use, you know what im talking about. it maybe called different things in different areas of the country.

[Asleep Altima]

piston head, cylinder head, engine head. they are all the same thing. it doesnt matter where you go in the world, thats what its going to be called. you mean just the pistons and rods by themselves?

[Importroller]

just the piston, you can swap the rods too, but you dont have to.

[Asleep Altima]

i dont think its been done in an altima... i wonder what it would raise the compression to though. i think shawn at .net was talking about this at one time. i heard its a pretty cheap way to raise the compression significantly though.

[Importroller]

it would be an 11.1 or 11.2 CR. in the 240s, it jumps the HP up to about 190 instead of the 140 in the SOHC, and the 155 in the DOHC. So I think we would be close to 190 as well. I'm really thinking about doing this cause I have 2 small blocks in my garage I can work on i my spare time

[Asleep Altima]

wouldnt take that long if you pulled the engine. it takes too long to pull that head with the engine installed.

[Importroller]

I already have the 2 short blocks, and 2 heads. I would just need the pistons to work on. and then I could swap the motors and see what the difference is. But i think I would need different injectors and ECU

[sonorous986]

while we're on the subject, would it be possible to swap a FWD DOHC head from an altima onto the FWD SOHC block in a stanza?

[pooraccountant]

guess it can be done as well.

btw, the U13 and S13/14 DOHC motor all have 9.5:1 cp ratio - for you reference..

Jay, what is upppppppp. (Ron)

[Altiman94]

we have some major miscommunication going on in here. the ka has 4 piston heads and one cylinder head. Those are the correct terms. Learn to use them correctly.

[sobmike333]

piston or piston head . would like me to email some pics hmmm, let me see oh i know you must mean pist on head.would you like me to post you a pic, probly a canadian

[sobmike333]

piston or piston head . hmmm, let me see oh i know you must mean pist on head.would you like me to post you a pic, probly a canadian

[NISTECH]

I was wondering when someone was going to bring up the stanza SOHC KA24E. THe stanza is the predasesor to the altima. and like the S13 and D21 it had the engine change to DOHC for the truck that didnt happen till the frontier came to be. side note: as of 2005 the KA is dead. Nissan has retired it.

[thekage]

Ok.. the piston swap out of the ka24e into a 240sx ka24de gives you 11.2 compression... but no one has ever dynoed that at 190hp... not to my knowledge. I am doing a build.. i/h/e, underdrive pulley, lightweight flywheel, E pistons, 91-94 cams, 370cc injectors, upgraded fuel pump, and a safc.. im expecting around 200...