Swirl valve for KA-T - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

_ivn13 · 10-21-2014, 03:42 PM

ive seen people remove it i know it has something to with better a/f mixture anyone have a thread they can show me?

Chaluska · 10-21-2014, 05:29 PM

get a S14 upper intake manifold, swap and done.

_ivn13 · 10-21-2014, 05:31 PM

What diffrent with the s14 manifold less emmision systems? Cleaner looking? @chaluska

Chaluska · 10-21-2014, 09:02 PM

Quote:

Originally Posted by _ivn13

What diffrent with the s14 manifold less emmision systems? Cleaner looking? @chaluska

the only difference, quite literally, is the lack of swirl valves.

that's it.

the lower manifold is a little different on the s14, but the S13 lower plenum bolts right up to the S14 upper.

S13 on left, S14 on right.

TheMechanic · 11-04-2014, 10:58 AM

what good is the scv? ive looked at it and it doesnt seem to benefit the engine other then open up at any throttle position.

bmaddock · 11-04-2014, 11:35 AM

Nissan thought they would increase low-end torque and decrease fuel consumption by "swirling" the air/fuel mixture similar to a throttle body spacer does on old carb engines. Apparently it didn't hold up to its claims because they removed the butterfly valves on the S14 intake manifolds. Cool idea but ultimately impedes airflow.

TheMechanic · 11-04-2014, 12:09 PM

so would doing the s14 upper mani swap benefit a stock ka set up?

bmaddock · 11-04-2014, 01:05 PM

On an S13 turbo KA setup, yes.
On an S13 NA KA setup, no.

Although I have no experience with this modification, theoretical gains will be negligible on an NA setup.

TheMechanic · 11-13-2014, 01:56 AM

its understandable that kat setups will benefit.. i wanna dig into this now.. that dam scv is tough to get to and would free up some space used for repairs

10-21-2014, 03:42 PM	#1
_ivn13 Join Date: Oct 2014 Location: Whittier, CA Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	Swirl valve for KA-T ive seen people remove it i know it has something to with better a/f mixture anyone have a thread they can show me?

10-21-2014, 05:29 PM	#2
Chaluska Zilvia Addict Join Date: May 2008 Location: Missouri City, TX Age: 38 Posts: 997 Trader Rating: (2) Feedback Score: 2 reviews	get a S14 upper intake manifold, swap and done. __________________

11-04-2014, 11:35 AM	#6
bmaddock Zilvia Junkie Join Date: Sep 2011 Location: Richmond Posts: 506 Trader Rating: (1) Feedback Score: 1 reviews	Nissan thought they would increase low-end torque and decrease fuel consumption by "swirling" the air/fuel mixture similar to a throttle body spacer does on old carb engines. Apparently it didn't hold up to its claims because they removed the butterfly valves on the S14 intake manifolds. Cool idea but ultimately impedes airflow. __________________

11-04-2014, 01:05 PM	#8
bmaddock Zilvia Junkie Join Date: Sep 2011 Location: Richmond Posts: 506 Trader Rating: (1) Feedback Score: 1 reviews	On an S13 turbo KA setup, yes. On an S13 NA KA setup, no. Although I have no experience with this modification, theoretical gains will be negligible on an NA setup. __________________

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10-21-2014, 05:31 PM	#3
_ivn13 Join Date: Oct 2014 Location: Whittier, CA Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	What diffrent with the s14 manifold less emmision systems? Cleaner looking? @chaluska

11-04-2014, 10:58 AM	#5
TheMechanic Join Date: May 2014 Location: Chino, Ca Age: 32 Posts: 21 Trader Rating: (0) Feedback Score: 0 reviews	what good is the scv? ive looked at it and it doesnt seem to benefit the engine other then open up at any throttle position.

11-04-2014, 12:09 PM	#7
TheMechanic Join Date: May 2014 Location: Chino, Ca Age: 32 Posts: 21 Trader Rating: (0) Feedback Score: 0 reviews	so would doing the s14 upper mani swap benefit a stock ka set up?

11-13-2014, 01:56 AM	#9
TheMechanic Join Date: May 2014 Location: Chino, Ca Age: 32 Posts: 21 Trader Rating: (0) Feedback Score: 0 reviews	its understandable that kat setups will benefit.. i wanna dig into this now.. that dam scv is tough to get to and would free up some space used for repairs