Variable valve timing

[Ni5mo180SX]

Well it seems Jeff240sx likes to close the threads ive been posting on lately so I had no choice but to open up another thread.

" know this is mostly a semantic argument " -uuic

"but like Uiuc said, Ni5mo attempted his semantic argument"-Jeff240sx

No, sorry jeff, this was a semantic argument in general. I dont know how you interpreted it otherwise.

I understand that nothing may be the same to every detail but variocam plus and vvtl-i all use a third cam lobe to change lift with the variable between them being the actuator for this process.

[onefast240]

What the main question is  is "How fast do you want to go and how much do you want to spend?" If you have a good sum of $$$ and are like me and want stupid amounts of HP 500+ you want to go with an s-13 black or red top. The VVT it the s-14 engines fails over 400 HP. Granted many have built 400+ motors and haves destroyed the valve train but do you really want the headache. The s15 motor hav a more refined vvt that is stronger but the 6 speed trans isn't the best thing in the world. So you have to think how much horsepower, how much $$$ as well as daily driveability. If you plan on keeping the motor pretty stock do an s-14. If you nuts like me get an s-13.

[uiuc240]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (Ni5mo180SX @ Dec. 09 2002,1:29)</td></tr><tr><td id="QUOTE">Well it seems Jeff240sx likes to close the threads ive been posting on lately so I had no choice but to open up another thread.

" know this is mostly a semantic argument " -uuic

"but like Uiuc said, Ni5mo attempted his semantic argument"-Jeff240sx

No, sorry jeff, this was a semantic argument in general. I dont know how you interpreted it otherwise.

I understand that nothing may be the same to every detail but variocam plus and vvtl-i all use a third cam lobe to change lift with the variable between them being the actuator for this process.</td></tr></table><span id='postcolor'>
VVTL-i (http://www.corollaperformance.com/TechInfo/VVTLi.html)

VANOS (http://www.bmwworld.com/technology/vanos.htm)

VarioCam Plus (http://leo.worldonline.es/jaumepor/angles/tecnica/varicamen.htm)

MIVEC (http://www.mitsubishi-motors.co.jp/docs6/history/html/gdi.htm)

VTEC (http://www.leecao.com/honda/vtec/dohcvtec.html)

While all of these accomplish much the same task, Honda's system is unique in having three cam lobes joined by an oil-actuated pin (Porsche's is the closest to this). I'm glad you brought this up, as I needed to keep up on new technology...however, I am right. You are wrong. heheh. No offense, man. I'm just saying that VTEC is *unique* from the other systems (not that it's any better, or that no one has anything like it). In fact, Porsche's system is MUCH better...its range of adjustability far exceeds VTEC. BMW's new Double VANOS (E46 M3) is close on Porsche's heels, too.

Eric

[Ni5mo180SX]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (uiuc240 @ Dec. 08 2002,3:30)</td></tr><tr><td id="QUOTE">While all of these accomplish much the same task, Honda's system is unique in having three cam lobes joined by an oil-actuated pin (Porsche's is the closest to this). I'm glad you brought this up, as I needed to keep up on new technology...however, I am right. You are wrong. heheh. No offense, man. </td></tr></table><span id='postcolor'>
"I understand that nothing may be the same to every detail but variocam plus and vvtl-i all use a third cam lobe to change lift with the variable between them being the actuator for this process. "

I agree with what you've said. They above mentioned systems a third cam lobe to increase lift. The difference is how they're actuated. The principal and intent of each system is the same. Thanks for the review though &nbsp;<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>

[Integraholic]

VTEC sucks, VVTi sucks, Zetec sucks. &nbsp;Its not true variable valve timing, it just changes from one cam lobe to another. &nbsp;BMW's Valvetronic is true variable valve timing. &nbsp;It actually varies the timing according to different conditions. &nbsp;Read up on it.

[RedSuns]

from MY experiance with my S14 SR is that the VVT/VTC(whatever you want to call it)....it is controlled by the ECU(duhh) it uses the readings from the MAFS,TPS and VSS sensors...i did 8 dyno runs....and then i compared the different curves....the different boost levels yeilded different results(of course) but when i changed throttle positions i began to notice a slight change in the curve.....i have been doing a lot more research on the system in hope to be able to safely upgrade cams while still using the VVT/VTC systems.....i have heard of it being done...but the tuning is tedious.....if anyone sees any flaws in what i just said be sure to let my know IN A NICE MANOR OR I WILL GIVE YOU A DIRTY LOOK THRU THE INTERNET(if is possible)