Re: ADVANCED VTEC
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?
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Re: ADVANCED VTEC
BMW did a fully electronically controlled valve engine a few years ago. ECU had full control of every valve.
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Re: ADVANCED VTEC
Originally Posted by Jorsher
Robb - it said 3 years from then is when they'll try to have it in cars, which would mean sometime in 2009 (this year)
Despite the expected jokes about a vtec, continuously variable valve timing sounds sweet. Any idea how this advanced technology works, JD? Electronically actuated? Could be the end of cams... Buick invented continuously variable valve timing in the late 1920's. No new technology here, just a practical application. |
Re: ADVANCED VTEC
Originally Posted by Robb
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. 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. |
Re: ADVANCED VTEC
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. |
Re: ADVANCED VTEC
Yah, a single cam profile is efficient for the whole 8000-9000 rpm. Waste of time.
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Re: ADVANCED VTEC
Originally Posted by Jorsher
Yah, a single cam profile is efficient for the whole 8000-9000 rpm. Waste of time.
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. |
Re: ADVANCED VTEC
Originally Posted by Robb
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. 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... |
Re: ADVANCED VTEC
Originally Posted by 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... |
Re: ADVANCED VTEC
the amount of drag and friction all the extra ---- and cams and blah blah, single cams still rule the mpg
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