differences between engines

[moose]

I was looking at buying parts for my S14, and I was just wondering if there is a difference engine wise between the S13 engine and the S14 engine. The parts are for the engine only, and they are for a 93. I know that the hp ratings are the same, but are they the same setup? I was looking into intakes and headers.

Thanks

[DuffMan]

S14 pistons are aparently stronger, and the s14 intake manifold doesn't have the secondary butterfly setup.

[mrmephistopheles]

Sorry. That's a myth. S14 manifolds don't have the butterflies, though, that's true.

-Kevin
Originally posted by DuffMan
S14 pistons are aparently stronger, and the s14 intake manifold doesn't have the secondary butterfly setup.

[moose]

So, I could put an S13 Header on my S14? Would that work? What about the rest of the engine?

[LoCo]

Originally posted by mrmephistopheles
Sorry. That's a myth. S14 manifolds don't have the butterflies, though, that's true.

-Kevin

go with SOHC pistons!! :D

well that's if you are going to stay N/A... to raise the compression. :cool:

[Jeff240sx]

Yea. All the pistons are the same. Same part numbers, too. There is one difference though, s13 models have 'hotter' cams in them. Everyone thinks it's '91 cams... but Asad from FA has them in his '93, according to his FSM.
-Jeff

[AceInHole]

Originally posted by Jeff240sx
Yea. All the pistons are the same. Same part numbers, too. There is one difference though, s13 models have 'hotter' cams in them. Everyone thinks it's '91 cams... but Asad from FA has them in his '93, according to his FSM.
-Jeff
Apparently all DOHC S13 cams were 240 intake 248 exhaust.

So, I could put an S13 Header on my S14?
Yes

Would that work?
yes, but i'm not sure if you'd actually gain any power. You might even lose some. Lets put it this way though.... the S14 makes as much power as the S13 does with 232 cams on the intake and exhaust. 8 less degrees on the intake side, 16 less degrees on the exhaust side. That power had to be made up somewhere else eh?

What about the rest of the engine?
S13 head swaps onto the S14 block and vice versa. Cams swap, trannies swap, almost everything swaps. Just that the electronics are a bit different (the distributors for instance).

[moose]

I find that more parts are made for the S13 than S14. Could I use an S13 Turbo in my S14 as long as it's a KA24DE? I was thinking I could do that. Um, what would a set of high-lifting cams do for my ka?

[Jeff240sx]

Originally posted by moose
I find that more parts are made for the S13 than S14. Could I use an S13 Turbo in my S14 as long as it's a KA24DE? I was thinking I could do that. Um, what would a set of high-lifting cams do for my ka?

The engine bays are different in the s13 and s14, so you *may* run into fitment problems when you use a s13 turbo kit in an s14 chassis. Also, you don't really want high-lifting cams in a KA-T, unless you're making the power for it.
-Jeff

[AceInHole]

Originally posted by Jeff240sx
Also, you don't really want high-lifting cams in a KA-T, unless you're making the power for it.
-Jeff

Well, higher lift would be better than longer duration wouldn't it??

[moose]

Originally posted by Jeff240sx
The engine bays are different in the s13 and s14, so you *may* run into fitment problems when you use a s13 turbo kit in an s14 chassis. Also, you don't really want high-lifting cams in a KA-T, unless you're making the power for it.
-Jeff
What if I'm only running a non-turbo? Could high-lift cams work?

[Zemus]

Originally posted by LoCo
go with SOHC pistons!! :D

well that's if you are going to stay N/A... to raise the compression. :cool:
If im not mistaken sohc pistons have lower compression.

89-90 SOHC: 9:1
91-98 DOHC 9.2:1

If you wanted to go the cheap ass way, go to a junk yard, find a stanza with a ka in it, like a 91, those pistons are 9.3:1. Those might work, :shrugs: And the Altima 94 has a KA i think with 9.4:1 comp pistons, but im not sure if those would fit, i would think they would need to be custom fit :-D

[AceInHole]

Originally posted by moose
What if I'm only running a non-turbo? Could high-lift cams work?
They'd probably work against you with more valvetrain loss. Higher duration cams would be better.

[240fluke]

Actually, the DOHC KA in the 240 came with 9.5:1 compression pistions, while the EARLY SOHC 240 came with a slightly juiced 9.1 or 9.2:1 compression ratio, while all other SOHC KA's came with an 8.6:1 compression ratio.

Tim '95 SE

[Zemus]

Originally posted by 240fluke
Actually, the DOHC KA in the 240 came with 9.5:1 compression pistions, while the EARLY SOHC 240 came with a slightly juiced 9.1 or 9.2:1 compression ratio, while all other SOHC KA's came with an 8.6:1 compression ratio.

Tim '95 SE

where are you getting this info, i know that the Pickup KA has 8.6:1 but thats 91+. Show me the site, cuz i got my info from MSN.com carpoint

[elevator]

Originally posted by Jeff240sx
The engine bays are different in the s13 and s14, so you *may* run into fitment problems when you use a s13 turbo kit in an s14 chassis. Also, you don't really want high-lifting cams in a KA-T, unless you're making the power for it.
-Jeff

Isn't the bay in an S14 bigger than the bay in an S13? I wouldn't think there would be fitment probs. A blacktop will fit in both....so a red top should fit in both. The exhaust systems might be different from the bay back but at the connect it would be the same....wouldn't it?

EDIT: But then I am talking SR20DET. I know nothing of the KAs. That might be different, but I can't imagine much in the way of space...as the S14 would be a bigger area to work with.

[Jeff240sx]

Originally posted by gladhatter
Isn't the bay in an S14 bigger than the bay in an S13? I wouldn't think there would be fitment probs. A blacktop will fit in both....so a red top should fit in both. The exhaust systems might be different from the bay back but at the connect it would be the same....wouldn't it?

I'm pretty sure he's talking about whether or not to turbo the KA motor...
If he's talking about a swap, then yea, it'll fit. Just gotta get an exhaust that is chassis based, and not engine based.
-Jeff

[elevator]

got me before I edited....my bad:rolleyes:

[Jeff240sx]

Originally posted by Oni
where are you getting this info, i know that the Pickup KA has 8.6:1 but thats 91+. Show me the site, cuz i got my info from MSN.com carpoint

The pickup KA actually has less power than the 240sx KA also. Think of the Dodge V-10. One is a torque monster that goes in trucks... the other is retuned for a Viper. Same with the KA.
The 240sx KA compression that he stated are correct.
-Jeff

[Zemus]

Originally posted by Jeff240sx
The pickup KA actually has less power than the 240sx KA also. Think of the Dodge V-10. One is a torque monster that goes in trucks... the other is retuned for a Viper. Same with the KA.
The 240sx KA compression that he stated are correct.
-Jeff
I ment 91+ for the pickup not for the 240, and yes the truck only has 130HP. Where did u get those #s

[240fluke]

http://www.socal240sx.org/

Features and Specs.

Check out the 89/90 SOHC KA's and the '95 DOHC KA's.

Hmmm, interesting, looking back at that site, it looks like the '91-'94 KA's were actually 8.6:1, weird. Can somebody confirm or deny this? I always thought it was 9.5:1.

Tim '95 SE

[240racer]

the head on the DOHC is different then the one on the SOHC. The combustion chamber on the DOHC is smaller, so if you put the 8.6:1 comp pistons in the DOHC motor, then the compression ratio is raised to 11.1:1.
http://forums.freshalloy.com/ubbthreads/showflat.php?Cat=&Board=UBB9&Number=67296640&page=0&view=collapsed&sb=5&o=&fpart=1

[AceInHole]

Originally posted by 240fluke
http://www.socal240sx.org/

Features and Specs.

Check out the 89/90 SOHC KA's and the '95 DOHC KA's.

Hmmm, interesting, looking back at that site, it looks like the '91-'94 KA's were actually 8.6:1, weird. Can somebody confirm or deny this? I always thought it was 9.5:1.

Tim '95 SE

Only the late 89's and 90's were 8.6:1. All DOHCs were 9.5:1 IIRC

[240racer]

Originally posted by 240fluke

Hmmm, interesting, looking back at that site, it looks like the '91-'94 KA's were actually 8.6:1, weird. Can somebody confirm or deny this? I always thought it was 9.5:1.

Tim '95 SE

that must be a typo, all DOHC motors have 9.5:1

[tater]

:confused: :confused: are all ka blocks the same?mening i am triing to find a block that will bolt up to everything in my wifes 93 240sx?

[Jeff240sx]

Originally posted by tater
:confused: :confused: are all ka blocks the same?mening i am triing to find a block that will bolt up to everything in my wifes 93 240sx?

Blocks should be the same. Heads are different on the DOHC and SOHC, as well as pistons, ect. But, get an s13 or s14 motor for the '93, cuz the '89-'90 have different flywheel/clutch setups.
-Jeff

[moose]

o.k o.k. here we are getting off course. The original question from the start, was:

Can you put headers and S13 engine parts (besides camshafts, and heads) on an S14 provided they have the same engine and room?
Someone please help me. All I can find are headers for an S13 KA24DE. Will this work?

[Jeff240sx]

I don't have proof.. but I don't think the headers will work, because exhausts aren't interchangeable. But I'm not 100% certain I'm right. They, however, will bolt up. And you can put s13 cams into s14 motors.
-Jeff

[240fluke]

Honestly, what I think it comes down to is that the internals of the engines are pretty much swapable between the two engines (S13 vs. S14). The exterior parts of the engines might be where you run into problems (due to the engine bay part locations and sizes of specific parts). The headers, probably should bolt up fine, but they might have clearance issues on the S14. The only real way to know though is to test it out and see if it will fit. The clearance issues are the same reasons why turbo systems specifically designed for either the S13 or S14 have problems when being fitted to the other chassis.

Tim '95 SE

[HaLo]

Originally posted by AceInHole
Only the late 89's and 90's were 8.6:1. All DOHCs were 9.5:1 IIRC

Then how come all the specs scans (1991, 92 AND 93) have compression ratios at 8.6:1 (on the socal240sx.org site)

[Wiisass]

Hotshot and greddy both make headers for the S14. I think one of the main differences between the exhaust side of the S13 KA and S14 KA is the cat. The S14 has the cat very close to the stock headers and then a second dummy cat which i think is in the same place as the normal s13 cat. The hotshot replaces the stock s14 cat and you can put one in place of the dummy cat. The greddy are short headers that bolt up to the stock s14 cat.

Tim

[drift freaq]

Well, higher lift would be better than longer duration wouldn't it??

not on a Turbo engine. On a NA engine you want higher lift cams for more power because the engine has to create a vacuum to suck in the air fuel mixture. the higher lift cam causes the valve to open deeper into the combustion chamber, allowing more of a vacuum venturi effect on the air fuel mixture as the piston downstrokes. On a Turbo engine your forceing your air fuel mixture into the combustion chamber so you do not need the venturi vacuum effect. You want the Valve to stay open longer i.e. more Duration so that you can pack more of, or we shall say a denser air fuel mixture, thereby getting a bigger charge on combustion. which creates more power.

so basically High lift Cam = NA engine
Long Duration= Turbo charged engine