Scott-EP

it looks like it still has a cam chain so now im lost. i was thinking the same thing with actuated valves. maybe electronically adjustable lifters?

bitchM0VE

BMW did a fully electronically controlled valve engine a few years ago. ECU had full control of every valve.

Hitchhikkr

I was being sarcastic. Im not buying any honda made after 99' :P

Buick invented continuously variable valve timing in the late 1920's. No new technology here, just a practical application.

Jorsher

Yeah, but I'm betting Honda's variation is a different technology than what Buick used in the 20s.

Obviously there were issues with it, or it was too complex, or else it would be used by every manufacturer today, like vtec-ish tech that's used by everyone.

I feel you on the "no new honda after 99" thing, although if they do the new CRX right, I may get one.

Hitchhikkr

Back "in the day" we didnt give a flying ---- about emissions or gas mileage, hince why no one bothered with it.

Vtec is just a good idle. Nothing more.

Jorsher

Yah, a single cam profile is efficient for the whole 8000-9000 rpm. Waste of time.

Hitchhikkr

Yeah never mind about airflow disruption during the switchover.

Last time I checked, you still spec your cams for the powerband/gearing you want to run.

For me at least, it is a waste of time.

Jorsher

Airflow disruption for a fraction of a second?

I get what you're saying, that you'll spec the cams for a specific RPM range that you'll be "performing" in, but multiple valve durations is still more efficient than one...

Hitchhikkr

Sure, its probably more efficient, but therein lies the problem for people like you and I. The more complex they make the system, the more the design lends itself to be unforgiving in a situation where the airflow is increased above and beyond what the engine was ever intended for. Yes, this is true to an extent with any car, but the rules havent changed when making power. Still gotta cram as much air and fuel in there as possible. Everything is a compromise, some are greater than others. 'New' tech is always fun to learn about, but there will always be compromises that must be overcome. Will this AVTEC be a compromise for design in the long run? Guess we'll see.

Smith-02

the amount of drag and friction all the extra ---- and cams and blah blah, single cams still rule the mpg