new vtec (avtec)
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94NDTA;170895 wrote:
That is amazing. The idea of a variable length intake manfold is very smart. Shorter in the low RPM's for more TQ, higher in the upper RPM's for more hp. I hope this catches on with other car maakers.There is a video somewhere that is pretty cool.
I believe shorter runners would make more power up top, and longer down low?
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obviously they know what they are doing......with im sure millions of dollars in research and all
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The GSR had secondary butterflies stock as well.
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integra_gsr98;170971 wrote:
The GSR had secondary butterflies stock as well.werd^^^...stock it's kinda like listening to two "mini-vtecs" so to speak...mmmbaaaaDAAAAA...that isnt meant to be sarcastic rice like I normally would...Thats what it actually sounds like.
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I wish there were some engineering drawings showing how this system worked. The variable length intake runner stuff isn't new.. although i can't think of an application off hand.
The continuously variable valve lift and cam phasing are interesting and a definite departure from how VTEC used to work. Note that AVTEC is not the first introduction of continuously variable valve lift into a production engine... Valvetronic from BMW has been doing this since 2002 or so, and I wouldn't be surprised if they weren't the first.
I've heard that F1 engines use pneumatic valve trains.. i wonder if/when we'll see that in production cars. If anyone has links to drawings of how these systems work, that'd be fantastic.
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Volvo I believe will be the first company to market w/ Pneumatic valves. Garberg would probably know more.
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GarageAlchemist;170940 wrote:
I believe shorter runners would make more power up top, and longer down low?94NDTA;170942 wrote:
No.Actually YES. Short runners = better high RPM power. Long runners = better low RPM power and more torque.
94NDTA;170947 wrote:
Explain. Like they had one butterfly valve open at lower rpms, and another on a different length runner tha would open at higher RPM?It's simple, there's essentially 8 different intake runners. Normally the air passes through the long runners. Butterfly opens at a certain RPM to pass the air through the short runners, instead of the long ones.
thrash;170992 wrote:
I wish there were some engineering drawings showing how this system worked. The variable length intake runner stuff isn't new.. although i can't think of an application off hand.Here's a link to Yamaha's website to give you a good idea. Move your cursor to the one thats' closest to the Yamaha symbol on the gas tank. http://www.yamaha-motor.com/sport/products/modelinnovation/6/0/innovation.aspx
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