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29th June 2014, 09:32 | #1 |
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Previously owned- MG ZT V6 160 Y plate Lpg, MG ZT 190 2003 In Rare Celestial Factory Ordered Lpg MG Join Date: Mar 2010
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V6 Inlet Manifold- Vis Valves - How Does This Work?
Hi all,
I have been reading this from the Rave CD- You can see from the above how the vis system is layed out. Intake air enters into 2 plenum chambers after the throttle body, at the end of each plenum there is a balance valve to either join the two plenums together or seal the plenums independently so each plenum feeds 3 cylinders each. There is six inlet pipes which feed from plenums to cylinders, these each have a valve which is opened by the power vis motor. These open into a apparently sealed 3rd plenum with no apparent in or out other than the power valves. So at low speed each cylinder pulls through a long tract and plenum. At mid speed each cylinder pulls through a long tract and both main plenums. High speed- all power valves open so each cylinder pulls through the short tract plenum but as the power valves open into a sealed plenum the air must be being pulled through the other open power valves/ long tracts and main plenums. Can someone explain this- the power valves open into the 'short tract' sealed plenum which gets its air from the long tracts/ main plenum so how can it be shorter?? I have racked my brains over how this works
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Previously owned- MG ZT V6 160 Y plate Lpg, MG ZT 190 2003 In Rare Celestial Factory Ordered Lpg MG ZT 190 2004 lpg |
29th June 2014, 10:06 | #2 |
Precise
Rover 75 Tourer 2.5KV6 Connoisseur SE Join Date: Mar 2013
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Note the words "tuned to resonate", must be like a musical instrument when it all comes together. Read Wikipedia "Inlet manifold" and Helmholtz effect
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29th June 2014, 20:17 | #3 |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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It's always a good idea to find out how things work! Unfortunately, MG Rover's technical description is unreliable. Take the very first sentence:
"At low speed the balance valve and power valves are closed" Errr ... actually the balance valve is open. If you don't believe this, ask Stocktake. So Simon, don't torture yourself. Unless you know someone highly qualified in the fluid dynamics of internal combustion engine intake systems, it's best to just make sure that the system is working as designed. Simon
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29th June 2014, 20:23 | #4 | |
This is my second home
Previously owned- MG ZT V6 160 Y plate Lpg, MG ZT 190 2003 In Rare Celestial Factory Ordered Lpg MG Join Date: Mar 2010
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Quote:
I think reading the description on how it works confused me more.
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Previously owned- MG ZT V6 160 Y plate Lpg, MG ZT 190 2003 In Rare Celestial Factory Ordered Lpg MG ZT 190 2004 lpg |
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29th June 2014, 20:31 | #5 |
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If both actuators are working, the inlet is working as it should. It's a bit of a grey area to describe what actually happens, but Rave seem to have their own idea on the subject.
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