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SVTPerformance's Chain of Restaurants
The Blower Bistro
Tial BOV issue
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<blockquote data-quote="Blinkwow74" data-source="post: 16287424" data-attributes="member: 150930"><p>So I did the test with the vacuum hand pump. The tial bov unseats at -4hg at approx -10hg it’s fully seated to the top.</p><p>As I release the vacuum it starts to release and is just barely open at -4hg.</p><p></p><p>So currently confused why it doesn’t even move when I press on the gas. My boost gauge shows I’m at just under 0hg but the valve stays fully seated as though its at -10hg or greater vacuum.</p><p></p><p>It weird because if I had a vacuum leak you’d think the valve would easily close shut.</p><p></p><p>So my thoughts on this are. Once I accelerate to a point that it’s less than -4hg vacuum the bov should shut. The positive pressure from the supercharger is now filling the intake manifold. Where part of that positive pressure makes its way through the vacuum line to the diaphragm in the tial bov to make sure there is more pressure pushing the bov shut plus the 2psi spring. Then when you let off the gas there is a vacuum created and the valve is immediately opened to release that positive pressure to atmosphere.</p><p></p><p>So what would cause the bov valve to maintain vacuum enough to remain fully seated in the bov valve in the open position. Even when at less than -4hg damm near zero</p><p></p><p>My car friends are equally confused</p></blockquote><p></p>
[QUOTE="Blinkwow74, post: 16287424, member: 150930"] So I did the test with the vacuum hand pump. The tial bov unseats at -4hg at approx -10hg it’s fully seated to the top. As I release the vacuum it starts to release and is just barely open at -4hg. So currently confused why it doesn’t even move when I press on the gas. My boost gauge shows I’m at just under 0hg but the valve stays fully seated as though its at -10hg or greater vacuum. It weird because if I had a vacuum leak you’d think the valve would easily close shut. So my thoughts on this are. Once I accelerate to a point that it’s less than -4hg vacuum the bov should shut. The positive pressure from the supercharger is now filling the intake manifold. Where part of that positive pressure makes its way through the vacuum line to the diaphragm in the tial bov to make sure there is more pressure pushing the bov shut plus the 2psi spring. Then when you let off the gas there is a vacuum created and the valve is immediately opened to release that positive pressure to atmosphere. So what would cause the bov valve to maintain vacuum enough to remain fully seated in the bov valve in the open position. Even when at less than -4hg damm near zero My car friends are equally confused [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Blower Bistro
Tial BOV issue
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