Blow off valve

Hi,

I was wondering if i could install a BOV on my '97 prelude 2.0 (non Vtec)
If yes, what are the best BOV's??

Gr33tzz,

Importcustomz

Is it forced induction equipped?

You can put a blowoff valve on any car which has an intake, but it won't be as loud as a turbocharged car. As a turbo is spinning, it's cramming air towards the intake and throttle body. When you let off the gas the throttle plate closes, stopping that air completely, which otherwise would bounce back causing the turbo fan (compressor) to stop immediately and slowly damage it over time. A blowoff valve opens up after sensing this sort of shockwave, letting the compressor spin out after every shift or letting off the gas. When you let off the gas in a non-turbo car, air simply releases back out the filter. If you weld a bov onto your cai you would have to adjust the setting to super sensitive, and even then there would barely be enough psi to open it and have that huge psssheeeww sound. Try it though, and let me know how it sounds. After that you can buy an intercooler and custom route your cai through it :bigthumb: :lol:

Your right, he could...but if it isn't turbocharged WHY would he?

Just for the sound, who knows. Personally I wouldn't do it because I don't have a turbo, but that's me.

A naturally aspirated engine operates under atmospheric pressure so the air inside the CAI would simply stop moving when the throttle closed, as the pressure inside the CAI and outside would be the same. The reason a BOV works on a turbocharged engine is because air moves from areas of high pressure to an area of low pressure through diffusion. Since the pressure inside the CAI of an NA is the same as the pressure of the ambient air, the air would not even try to force its self outside. Air diffuses from areas of high pressure to areas of low pressure through the route of least resistance, so if for some reason there was pressure inside the CAI of an NA it wouldn't even put pressure on the BOV, but simply make its way back up the CAI and out the air filter (unless you had a CRAZY restrictive air filter).
The bottom line is, you could put a compressor bypass valve in an NA but it wouldn't do anything, and wouldn't make a sound.

Yup that's why I said above you would have to loosen the bov to be super sensitive for it to open, then a little bit of air would kind of whistle out. It would be interesting to see what it does that's for sure.

Hi there,

Thanx for the good explanation!! I just would do it for the sound. I'm from Belgium and we also have an automotive forum and I've asked the same question over there and they told me it wasn't possible on my car, they say it could only be used on cars with a turbo.


Gr33tzz,

Importcustomz

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It will do nothing for you performance-wise, and I'm not 100% sure if you'll still get the sound, but have at it if you have the money.

there would be no sound what so ever if you don't have compressed air in the intake pipe. BOV's make noise by releasing the compressed air out thats caused by the turbo. if you put a BOV on an N/A, there would be no sound because there would be vacuum when the BOV opens, not pressure. as for performance wise, there would be none.