The last thread about the secondary butterflies didnt answer the final question. Does the sohc have them? On the installs page where they are turbo-ing the sohc it says they removed them "Induction plumbing is constructed from mandrel bent 2.25 inch steel tubing which was powder coated flat black for a factory look. Two Spearco intercooler cores form a 12 x 12 x 3 unit. The stock secondary butterfly valves were removed from the intake manifold for better airflow. The rats nest of other extraneous bits were removed from the intake area for a more sanitary installation"
What does it take to remove these from the sohc. Same rules that apply to the dohc butterflies
butterflies
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goldenchild
- Posts: 213
- Joined: Wed Apr 23, 2003 3:47 pm
- Car: 90 Nissan 240SX KA24E-t go bye bye, gotta another in the works
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goldenchild
- Posts: 213
- Joined: Wed Apr 23, 2003 3:47 pm
- Car: 90 Nissan 240SX KA24E-t go bye bye, gotta another in the works
i removed it because it is a restriction in the manifold, its small but its still a restriction. Since its free and you have time i would do it. Im in the process of removing alotta of vacuum lines of the engine to see excatly what I need and dont need and the butterflies are part of the scv which is run by vacuum. My car is dead right now, the motor didnt last too long after i put the turbo on her, so i have another motor coming up here the end of the month. i did it myself its
uhh yes it is a restriction in your maifold, but then again if you look in it and see all the small little lumps inside it they are also restrictions. the second butterfly helps your car at low rpms. if you have any idea how the vortex engine works then you will understand how the second butterflys work. at low rpms they close causing the air to flow over them to move faster and almost force them selves into the engine. and that will give you a stable idle and better take-offs. they put it there for a reason. and removing all of the vaccum lines will only hurt you. you might find that you engine will be running lean(and we all know that that will destry and engine real fast) and there are many other things that wont work right. unless you know what you are doing and you know what a part does and you KNOW FOR A FACT that it wont mess anything up then remove it. but if you dont, then leave it there
I didn't take the rod out either.
My opinion, I don't call it second butterfly. I call it intake restrictor!It is not secondnary butterfly, and dont' work like secondary butterfly. Thus, it will NOT cause anything. It will not lean your car . It will not cause any bad idle. And it will NOT destroy the engine any much faster (oh my god, where does this come from). And there's nothing related to the "intake restrictor".
When the S.V.C valve close (engaged), it restrict your intake manifold with a small pass through hole at the corner. This increase the velocity of your air, thus promote better fuel vaporization, and producing swirl air effect in your combustion chamber. Primary, this is to improve fuel consumption and increase stability of engine condition, when you start your engine in the morning. (and for emission reason too)
S.V.C valve open (dis-engaged) when:1. Water temperature below 35C /95F2. Engine RPM above 1400
So you can see, is pertty much a useless design. Since I have a turbo, I don't want it there
I didn't remove the rod because I dont want to deal with the leak when rod is gone.
My opinion, I don't call it second butterfly. I call it intake restrictor!It is not secondnary butterfly, and dont' work like secondary butterfly. Thus, it will NOT cause anything. It will not lean your car . It will not cause any bad idle. And it will NOT destroy the engine any much faster (oh my god, where does this come from). And there's nothing related to the "intake restrictor".
When the S.V.C valve close (engaged), it restrict your intake manifold with a small pass through hole at the corner. This increase the velocity of your air, thus promote better fuel vaporization, and producing swirl air effect in your combustion chamber. Primary, this is to improve fuel consumption and increase stability of engine condition, when you start your engine in the morning. (and for emission reason too)
S.V.C valve open (dis-engaged) when:1. Water temperature below 35C /95F2. Engine RPM above 1400
So you can see, is pertty much a useless design. Since I have a turbo, I don't want it there
I didn't remove the rod because I dont want to deal with the leak when rod is gone.