BOV engineered

fat_82x · tinkerer Joined: 06 Feb 2003 Posts: 72

Ok according to the cop that helped me find problems with my car (fkn defect) i have to get blow off valves engineered... wat exactly do they have to do to engineer it? and how much would the certificates cost? cops are a joke!
Thanx

rust3 · backyard mechanic Joined: 04 Feb 2002 Posts: 971

not sure exactly why u would need to engineer a bov

a mate paid 50 to have his whole car engineered. some places will sting u though

Gene FJ20DET · Posted: Wed Oct 08, 2003 8:11 pm Post subject: Re: BOV engineered

QLD there legal, check your state, cos they shouldnt have to be engineered
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jetblackgem · tinkerer Joined: 06 Oct 2003 Posts: 77

sounds like the copper was being a prick , you dont have to engineer a bov thats bullshit

Poida · Posted: Thu Oct 09, 2003 12:05 pm Post subject: Re: BOV engineered

What engine are you running in your car?? Is it injected or carbied?

Problems can arise if you use a BOV in some applications but I don't know that it requires the expertise of an engineer to inspect it.

If you have a suck through carby system and the BOV vents, you are releasing a volatile mix into the under bonnet area risking a fire. The other problem is as soon as a BOV opens in such an application the fuel will no longer stay in suspension and it condenses as the pressure suddenly drops, (It's raining petrol) effectively leaving a pool of petrol in your manifold.

Personally, I can't understand why someone would want to fit a BOV anyway. The sound they make is 'different' to say the least but they have no other real value. If it's sound you want, pump up the sound system!
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Bugle · tinkerer Joined: 08 Oct 2001 Posts: 221

A BOV isn't even going to open if you put one on in a suck through setup..

Bugle · tinkerer Joined: 08 Oct 2001 Posts: 221

Is it plumb back or vent?
Plumb back shouldn't need engineering as it doesnt affect emissions.

Gene FJ20DET · Posted: Thu Oct 09, 2003 2:49 pm Post subject: Re: BOV engineered ATT: Poida

"The sound they make is 'different' to say the least but they have no other real value."

well the world is saved. i wish ppl would resurch and know what there talking about b4 they say shit like this.
do some resurch then comback and tell me that a BOV does NOTHING but make sound. cos thats bull shit
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Loz · backyard mechanic Joined: 05 Oct 2001 Posts: 943

They are worth their weight in gold. The sound is just a wank factor. I'll just let mine keep on fluttering.

Gene FJ20DET · Posted: Thu Oct 09, 2003 3:31 pm Post subject: Re: BOV engineered ATT: Poida

im running a plumb back. silent BOV, no sound. not if there "sound" is the only thing there good for why would they sell a silent one...
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GROOV3 · petrol head Joined: 04 Oct 2001 Posts: 3682

so you could say you had one lol
nah because your turbo doesnt like holding its breath

Gene FJ20DET · Posted: Thu Oct 09, 2003 3:39 pm Post subject: Re: BOV engineered ATT: Poida

thats a easyway of explaing it
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GROOV3 · petrol head Joined: 04 Oct 2001 Posts: 3682

very easy lol

Ben Wight · backyard mechanic Joined: 04 Oct 2001 Posts: 946

$50 for a engineers certificate. What a joke. QLD I bet!
slackest state in the whole country. they would let a ride on lawn mower with rocket propulsion on the roads.

Gold TX Sleeper · backyard mechanic Joined: 05 Feb 2002 Posts: 509

I'm definately gonna have to agree with Gene on this one. I know that Poida normally has a firm grasp on his knowledge, but in this case he seems in unfamiliar territory.
The sound a B.O.V or 'excess boost bypass valve' is a thing that has been capitalised and marketed to death. The sound is simply a by-product of what you are getting. I wrote a post explaining the uses and advantages of the B.O.V many moons ago, though it may have been in a different web-site/forum.
Put simply, a 'blow off valve' extends the life of a turbocharger/supercharger by reducing backpressure on the compressor wheel during rapid up-shifting. There are a handful of other advantages that can be learnt with further research. The more boost your application uses, the more you will deem one necesarry.