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Bwhaaaaaaaaaaaa-I can take it!

 
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Old 21 Dec 2003, 02:43 am
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Default Bwhaaaaaaaaaaaa-I can take it!

Topwater question-what in the blazes is BOV
Bovine ventilation?
Boys on viagra?
Beat old volvos?
Better open vent?
the big grin says BOV for the past 10 years---Been On Vacation
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Old 21 Dec 2003, 02:48 am
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Well, you haven't posted in the humor section, so I'll take you seriously - it's Blow Off Valve - for a turbo. When you back off gas, a BOV "dumps" uneeded boost to the air, keeping turbo from slowing down and ready for next application of gas.
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Old 21 Dec 2003, 02:58 am
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Humor section-this could be fun!!!I don't have a turbo-but isn't boost air pressure to force air into the manifold/how will that keep the turbo from slowing down?

the big grin still can't find the humor section
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Old 21 Dec 2003, 10:50 am
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Quote:
quote:Originally posted by cook

Humor section-this could be fun!!!I don't have a turbo-but isn't boost air pressure to force air into the manifold/how will that keep the turbo from slowing down?

the big grin still can't find the humor section
Higher boost = more back pressure on the turbo, so low or zero boost will allow it to spin easier. Remember you don't really need increased induction if your backing out of the throttle.
While I don't have a turbo I hear the other advantage is the mechanical NANANANA sound it makes if you can afford to back off the throttle just a bit while your pulling away from the competition.[8)]
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Old 21 Dec 2003, 11:17 am
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Quote:
quote:Originally posted by cook

Humor section-this could be fun!!!I don't have a turbo-but isn't boost air pressure to force air into the manifold/how will that keep the turbo from slowing down?

the big grin still can't find the humor section
Here's the deal....while you are applying the gas, the turbo is happily pumping air and forcing it into your intake manifold. When you back off the gas, all of that boosted air has nowhere to go (or a much smaller hole to go through). If left to itself, this boosted air would put a lot of extra pressure on your throttle plate, and back up to the turbo impellers, slowing them down and causing them undue stress...so instead, this BOV, also sometimes called a Compressor bypass Valve or Surge Valve, reroutes that air back into the intake side of the turbo, where it won't cause any harm. Some BOVs instead just vent it to the atmosphere, and some BOVs employ various devices to make this venting sound very loud so that you can taunt other racers with it.

Hope this helps. A great site for finding stuff out is www.howstuffworks.com
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Old 21 Dec 2003, 11:22 am
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Actually it's not all BOV's dump into the atmosphere. The designed purpose of a BOV is to prevent compressor surge. Throttle plate closes (when you let off the gas) and turbo is still pushing air out...well it hits that plate and where can it go...back towards the compressor. The air hitting back into the compressor is called compressor surge and is bad...the compressor slowly starts being damaged. I think that what was meant by "slowing down"....the turbo will slowly spool down eitherway...but without damage to the compressor with a BOV. The only advantage to dumping it into the atmosphere is really the noise.

*edit*..shoot you replied before me
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Old 21 Dec 2003, 04:58 pm
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You guys are good!!

the big grin says cook bleeds off pressure all the time
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