Wednesday, February 18, 2009
Variable Vent Tubes?
I went to test drive a Mazda CX7 yesterday. The car is nice - peppy - a lot different to the Honda Element. It's because of the turbocharged engine of course. What was entertaining was when the salesman started to tell me about the VVT engine. According to "Chuck", that meant variable vent tubes, which as he described it, was the difference between the size of your airway when you are breathing normally, and the size of your airway when you are panting for breath whilst running. Say what? The Mazda engine is able to alter the size of it's intake manifold depending on how hard I'm breathing?
Well I suppose it was a nice try. He got the 'variable' part of it right at least. What he was trying to describe of course was variable valve timing. More zippy engine performance requires more fuel-air mix, which requires altered and lengthened valve opening timing.
The closest thing to what he was describing (I think) is the variable length intake tubes on the Yamaha R1 motorbike. Or he could have just been pulling it out of his arse. Either way, he was trying to sell me a product he clearly didn't know anything about.
Well I suppose it was a nice try. He got the 'variable' part of it right at least. What he was trying to describe of course was variable valve timing. More zippy engine performance requires more fuel-air mix, which requires altered and lengthened valve opening timing.
The closest thing to what he was describing (I think) is the variable length intake tubes on the Yamaha R1 motorbike. Or he could have just been pulling it out of his arse. Either way, he was trying to sell me a product he clearly didn't know anything about.
// posted by Chris @ 10:02 
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Ha! I was gearing up to be informed about this new technology of Variable Vent Tubes.. lol. Once I saw VVT, I was like.. "OHH.. Variable vent TIMING.. yes."
# posted by 
Joely08 : February 18, 2009 11:48 AM
Joely08 : February 18, 2009 11:48 AM
perhaps its variable vane turbo, it helps eliminate low speed turbo lag.
# posted by 
: February 19, 2009 10:50 AM
: February 19, 2009 10:50 AM
Variable valve timing might have been what he was talking about, also the cx-7 does have a variable length intake manifold
# posted by : February 19, 2009 4:29 PM
: February 19, 2009 4:29 PM
He's an idiot, but a similar system existed on the Mazda KL 2.5-liter V6.
Go look up VRIS.
Go look up VRIS.
# posted by BlackOpSource : February 19, 2009 11:56 PM
BlackOpSource : February 19, 2009 11:56 PM
Yeah - variable resonance intake system. Similar to the variable length intakes on the Yamaha engine but with fewer moving parts - butterfly valves instead of physical moving tubes.
# posted by Chris : February 20, 2009 8:37 AM
Chris : February 20, 2009 8:37 AM
Good to hear it hasn't been totally lost to time, then.
That engine's a torque machine.
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That engine's a torque machine.
# posted by BlackOpSource : February 20, 2009 9:30 AM
BlackOpSource : February 20, 2009 9:30 AM
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