ka24det vs ka24et

[C-Kwik]

and c-quik, the valve difference is NOT 282mm. grab a ruler, that would be a GIGANTIC valve.

You must have missed my other post. I was talking about area.

And it's C-Kwik.

IwannaS15: Good looking out. But 282 is actually just under 1.7 cm squared.

[hannibal]

Not to get picky C-Kwik but 282 square mm = 2.82 square cm.If you had a square whose area was 2.82 square cm, each side would be nearly 1.7 cm long.1.7 cm x 1.7 cm = 2.82 square cmSorry, Tom no foot-wide valves here...

Jay

[zeardux]

well my prefence is the kae. i de believe it will make more power in the long run. i believe this is correct because about a month ago i read an article stating that 2v per cylindar engine will make more peak horse that 4v per cylindar engines, so i guess the same would apply here considering the e has 12 valves but the de has 16. and they do have very effiecent heads, but everthing can be improved upon, oversized valves, stiffer springs, high lift cams (drooool.....) in my opinon it comes down to preference.

[Xero]

hmmm...right and wrong.

he didn't say KA, my bad.

but the block he's talking about is not from a chevy.

-demetrius

there was a NAPS Z-series engine made back in the day, it was a 2.4L engine that had emissions and fuel economy in mind. I think it came in some family movers, maybe the old 70's Maxima. Can't quite remember, but the pistons are pretty large, you use that size piston when doing a big bore on a L28, along with the L28D crank, which then gives you 3.1L of SOHC L series goodness

as far as which is better, they have their strengths and weaknesses. HOWEVER!!! for those strengths and weaknesses to really come into play, you'd have to be going for EVERY BIT of HP that you possibly could, it sounds like you just going for cheap and easy, and it's gonna be daily driven, so it's got lower HP, therefor I'd suggest the SOHC, since it's more readily available and the parts are cheaper.

you must look at your power goals before you can figure out what is better. I like the CA18 over teh SR20 since it's nearly a grand cheaper for a front clip, and with low power goals, it doesn't matter which engine is "better" persay. Since they both rock :ylsuper

also, as was said many times, there are more NISMO parts for the SOHC because of what Nissan was using in their GT series racing, and that was the SOHC. However, if you put those HiComp SOHC pistons into a DOHC engine, you get soem crazy compression, yeah, I know, I'm biased towards the DOHC

--Justin

[C-Kwik]

Not to get picky C-Kwik but 282 square mm = 2.82 square cm.If you had a square whose area was 2.82 square cm, each side would be nearly 1.7 cm long.1.7 cm x 1.7 cm = 2.82 square cmSorry, Tom no foot-wide valves here...

Jay

I'm not sure if this was actually directed at me. I don't disagree that 282mm = 2.82cm. Thinking back, I had meant to point out that it is not all that close to 1 inch squared. Rather, just 1.7cm squared.

Teaches me not to reread my post before submitting it...

[C-Kwik]

well my prefence is the kae. i de believe it will make more power in the long run. i believe this is correct because about a month ago i read an article stating that 2v per cylindar engine will make more peak horse that 4v per cylindar engines, so i guess the same would apply here considering the e has 12 valves but the de has 16. and they do have very effiecent heads, but everthing can be improved upon, oversized valves, stiffer springs, high lift cams (drooool.....) in my opinon it comes down to preference.

Than I suppose Ferrari and a few other companies have been going at it all wrong with their 5 valves per cylinder? Or Honda should just hang VTEC up on the shelf and go with 2 valves per cylinder instead. Or perhaps add VTEC to a 2 valve per cylinder motor.

Peak HP is tied in directly with torque and RPM. Torque tends to be related to the volumetric efficiency. Volumetric efficiency relates closely to flow. Given cams that are designed to provide power at a high RPM, a DOHC motor should be able to provide more flow due to a better VE, thus make more peak power.

I wouldn't mind seeing that article though. It would be interesting to hear the theories behind that reasoning. I know I'm being somewhat facetious, but don't believe everything you read. Including what is posted in these forums or other forums. Do the research and use your own reasoning to validate what information is good or bad.

[TomsMR2]

i believe this is correct because about a month ago i read an article stating that 2v per cylindar engine will make more peak horse that 4v per cylindar engines, so i guess the same would apply here considering the e has 12 valves but the de has 16.

16v makes more peak power, and breathes better uptop. 12v has more torque.

[TomsMR2]

oh and its VERY debatable if 5v is actually better than 4. its marginally different, and theres a strong argument that 4 is just as good as 5. 2 and 4 is no comparison tho, 4 is definately better.

[C-Kwik]

16v makes more peak power, and breathes better uptop. 12v has more torque.

Not to be overly nit-picky, but the KA24E in a 1990 240sx made 140 HP and 152 lb-ft of torque. KA24DEs in later 240's had 155 HP and 160 lb-ft of torque. The DE makes more power and torque.

[7thGear]

but where did it make that power and torque

also how much torque does the E have at lets say 1000 rpm vs the DE at 1000 rpm

??

why do u think stock german cars rock everyone else off the line, cuz they have max torque at 2500 - 3000, while all the jap engines have to scream really hard just to get their peakes.

( tip, 2.7 liter Turbo charged audi's are nothing to mess with, even if its a station wagon ^_^)

[TomsMR2]

Not to be overly nit-picky, but the KA24E in a 1990 240sx made 140 HP and 152 lb-ft of torque. KA24DEs in later 240's had 155 HP and 160 lb-ft of torque. The DE makes more power and torque.

thats correct. my statement was kinda just a generalization. 16v's are usually higher breathers, while 12v's focus on downlow torque... the de does make more hp and torque in this case tho.

[C-Kwik]

According to my Chiltons, both motors make peak Hp and Torque at the same RPM's.

[w1ngzer0]

hey so .... what was the point of this big arguement? I just want to know.... Percentage differences between the single and duel. Like hp,tq,acc.,peak

I talked to someone saying E are built tougher. But i beleave both are built the same.. All this confusion. I am going ot need to know which one to get cause im getting a 240s with in a month or so.....**** they made a SOHC skyline.... why wouldn't a single cam 240sx be good?

:help :help :help

[McAdam]

single cam is fine, especially for a turbo application. makes more torque at lower RPM's there for your dont have to beat on it and rev the snot out of it to get hi HP numbers. and if you think torque cant be as fun as HP, just look at some of the old school datsun 240Z's on hybridz.org with 3.0L strokers. or the turbo 2.8's. 2 valves per cylinder and generally more torque than HP. they rock all the way down the 1/4 mile. tire fryers.

McAdam

[w1ngzer0]

why did they make twin cam motors if it wasn't good? I meen is there really any advantage to double that is worth the cost? Like the B16 swap the only reason people converted to that was the twin cam setup. This is very confusing man

[SingleCamSam]

The DOHC is probably an all-round better motor. I think the purpose of the argument was whether or not is was worth swapping to the DOHC, which it most likely isn't. You can make plenty of power with 12 valves.

[w1ngzer0]

Well the reason i came in was i was getting a 240sx and i am going to need to pick the DOHC or SOHC. I see that you guys are leaning toward the single. for cost and power. Honestly is there really and big gains from dohc?? Cause i meen if there isn't.... so many people have been fooled then. Like honda owners always go after dohc. can someone just talk to me on aol so i don't have to post a billion times. aol: speedesu

[C-Kwik]

I'd say if you are going to but a 240, if it's in your budget, get a DOHC. You're not going to get huge gains, but figure the DOHC already has 15 HP on the SOHC and has a bigger broader torque curve.

Sorry I missed your message on AIM. Got in late that night.

[SingleCamSam]

I agree. If you have the cash and/or opportunity, it's probably a better idea to get the DOHC. And this is coming from (obviously) a 12v owner.

[7thGear]

yeah, dito

i think the bottom line that everyone here says is that if you DONT have a choice, you should be perfectly happy with what you have

but if you have a choice between the two originaly then go with the better one right off the bat ( and maybe the s14 over the s13 body style)

[TomsMR2]

s13 > s14

[w1ngzer0]

Ok

1.)what engine is better for drifting? SOHC Or DOHC....the SR20 is a drifter and its DOHC right?

2.)im getting a 180sx and converting it with a ings+1 S15 kit but getting 180sx tails3.)Inside is going to be so necked

SOHC or DOHC boys..... im going to be drifting and wanting some nice power.

[SingleCamSam]

Never drifted officially, but i do love getting sideways. I'd say any of those engines would be fine, but it'll be easier to brake the tires loose with the KA.

[JPRempe]

there was a NAPS Z-series engine made back in the day, it was a 2.4L engine that had emissions and fuel economy in mind. I think it came in some family movers, maybe the old 70's Maxima. Can't quite remember, but the pistons are pretty large, you use that size piston when doing a big bore on a L28, along with the L28D crank, which then gives you 3.1L of SOHC L series goodness

as far as which is better, they have their strengths and weaknesses. HOWEVER!!! for those strengths and weaknesses to really come into play, you'd have to be going for EVERY BIT of HP that you possibly could, it sounds like you just going for cheap and easy, and it's gonna be daily driven, so it's got lower HP, therefor I'd suggest the SOHC, since it's more readily available and the parts are cheaper.

you must look at your power goals before you can figure out what is better. I like the CA18 over teh SR20 since it's nearly a grand cheaper for a front clip, and with low power goals, it doesn't matter which engine is "better" persay. Since they both rock :ylsuper

also, as was said many times, there are more NISMO parts for the SOHC because of what Nissan was using in their GT series racing, and that was the SOHC. However, if you put those HiComp SOHC pistons into a DOHC engine, you get soem crazy compression, yeah, I know, I'm biased towards the DOHC

--Justin

There is no 70's Maxima. 1981 was the first Datsun/Nissan 810/Maxima...

Unless you're talking about a strictly JDM vehicle...

[JPRempe]

They also went to the DOHC motor in an effort to provide cleaner emmissions

[TomsMR2]

1.)what engine is better for drifting? SOHC Or DOHC....the SR20 is a drifter and its DOHC right?

makes no difference at all.

[7thGear]

its all about suspension when it comes to drifting

because unless your a godly driver drifting will yeild bigger circuit times than grip driving.

only when you can achieve lower times using drift than grip should u be concerned about power.

[w1ngzer0]

Cleaner emitions.... not that big of a deal... is ther any other reason to go DOHC...?

[McAdam]

I guess its personal preference. dohc will also have more internal friction, marginally. SOHC is cheaper. up to you to decide. I say go for what ever you can get your hands on easiest

JPRempe>>>> actually, there was a datsun 810 made form 77 to 81, I beleive. ugly as hell, came with a L24E.

the Z24 came in like 82 to 88 4 X 4 pickups. and a few other tings. oh yeah, L30's kick ***. torque. lots and lots of torque. a guy at hybridz.org is putting down 255RWHP with over 200 ft/lbs available from like 4000 all the way to redline and a peak of like 275, me thinks. thats some serious motor. all N/A.

so SOHC's can perform too!!

McAdam

[C-Kwik]

For a given amount of power, the SOHC will actually have more friction in the valvetrain thean the DOHC. In order for the SOHC for flow as much air, it has to have higher lift and/or longer duration. This means the valve spring has to be stiffer to prevent valve float. The SOHC uses a rocker arm as opposed to the DOHC's direct actuated valves. Rocker arms are heavier and require a stiffer valve spring to prevent valve float. Stiffer valve springs cause more friction. Therefore the SOHC will have more friction....