new vtec (avtec)

[RidinRails]

Seen this on mnsc ...

http://paultan.org/archives/2006/09/26/honda-announces-advanced-vtec-engine-avtec/

[94NDTA]

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.

[killer69penguin]

new toy for torbert......

[DelSlow]

REPOST
http://www.fargostreet.com/forums/showthread.php?t=9738

[killer69penguin]

but its a good repost!

[ruthless351]

AAAWWWWW! Not another VTEC!!!

[torbs]

continuously variable...gheyness...i want my v-sweetness all at ONCE y0!!!one!!!eleven!!!!

[treimche]

Yamaha has this same technology on the 2007 R1. No vtec cams, but the variable length intake runners.

[GarageAlchemist]

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?

[GarageAlchemist]

This post is deleted!

[94NDTA]

No.

[PSiedTSi]

The idea has been used before, but obviously not as technically advanced. There are a few cars that came with butterfly valves that used different runners at different RPMs etc.

[KA-T_240]

PSiedTSi;170945 wrote:
The idea has been used before, but obviously not as technically advanced. There are a few cars that came with butterfly valves that used different runners at different RPMs etc.

KA's had them, well at least mine did.

[94NDTA]

Explain. Like they had one butterfly valve open at lower rpms, and another on a different length runner tha would open at higher RPM?

[PSiedTSi]

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?

Yes sir. There is an H22 sitting here with that same system. JDM 4G63's had them as well.

[killer69penguin]

obviously they know what they are doing......with im sure millions of dollars in research and all

[integra_gsr98]

The GSR had secondary butterflies stock as well.

[torbs]

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.

[thrash]

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.

[MisterCMK]

Ford has had butterfly valves in the intakes on a number of their motors. From the 2.0 SPI to the 4.0 SOHC to the 4.6 DOHC