So I'm new to the Vtec world and just curious how it works? I know it kind of has a kick like a turbo at higher RPM but what is going on in the engine? Thx

 

VTEC (which stands for Variable Valve Timing and Lift Electronic Control) is an electronic and mechanical system in some Honda engines that allows the engine to effectively have multiple camshafts. As the engine moves into different rpm ranges, the engine's computer can activate alternate lobes on the camshaft and change the cam's timing. In this way, the engine gets the best features of low-speed and high-speed camshafts in the same engine. Several of the links below go into the actual mechanics of the VTEC system if you are interested.

http://auto.howstuffworks.com/question229.htm

I found that by doing a quick google search.

 

Perfect Thanks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.Speed &raquo;</TD></TR><TR><TD CLASS="quote">So I'm new to the Vtec world and just curious how it works? I know it kind of has a kick like a turbo at higher RPM but what is going on in the engine? Thx</TD></TR></TABLE>

it aint that great..haha
good luck with ur accord mang, got pix?

 

Yah I got some pics but I'm new and having problems post them can you help?

thx

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.Speed &raquo;</TD></TR><TR><TD CLASS="quote">Yah I got some pics but I'm new and having problems post them can you help?

thx</TD></TR></TABLE>

you gotta use like photobucket.com and then insert the link between the [IMG][/IMG] things.

 

You need someplace to host the pictures (not your local machine) and then post using the picture buttons.

 

Ok I have an account at photobucket and have posted the images there now I still am confused. Do I just use the quick relpy button and then what? Not sure what to do from here??? Help!

 

I think Ifigured it out!!!

 

Nice ride. I don't care for the chrome rims though. Just don't think they look right on Honda's. The 6th gen V-6 couple wheels are nice anyway.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sj993 &raquo;</TD></TR><TR><TD CLASS="quote">VTEC (which stands for Variable Valve Timing and Lift Electronic Control) is an electronic and mechanical system in some Honda engines that allows the engine to effectively have multiple camshafts...</TD></TR></TABLE>

ha! I was about to compliment you on your awesome write up until I saw howthingswork.com lol. I love that website!

 

lol yeah, I was just gonna put it in my own words and post it but that was too much effort so I just copied and pasted.

 

[QUOTE=sj993] In this way, the engine gets the best features of low-speed and high-speed camshafts in the same engine.
QUOTE]

So does this mean that having a SOHC VTEC is better then having a DOHC non-VTEC? Also if in the SOHC VTEC it acts as a second camshaft how would that work in a DOHC? Aren't the H22's DOHC VTEC?

 

yeah the H22 is DOHC so the VTEC system controls intake and exhaust valves, so you get even more agressive valve timing. F22b1 SOHC when VTEC is NOT engaged
each intake valve runs on its own lobe of the cam, when it engages there is a larger center lobe that overrides the smaller lobes and runs both valves per cylinder. You'd really have to look at it, I wish I had pics.

What VTEC does is in changes your valve timing (when and how far you valves open up), as well as advancing or retarding your spark. Like he quoted (lazy bastard lol!) this gives you a smooth accelerating engine made for both low and high end torque. Honda has perfected this. Most high torque high RPM's engines run horribly at low RPM's because their power bands aren't made for it. They would be ineficient and aren't made for stop and go driving. VTEC gives you the best of both because you get decent performance from both ends of your power band, you can cruise very efficiently but when you need it you jam on the gas VTEC kicks in and you get more torque.

Some of the newer VTEC motors are doing some crazy stuff. VTEC-E I think its called where the valves are electo-pneumatic and INDIVIDUALLY controlled. As a result they can run super lean off of one intake valve and all sorts of cool stuff. Mega performance without killing your gas mileage!

 

just to throw in some info...honda didn't invent the whole concept of variable valve timing...they merely marketed it the best of any manufacturer (and gave it an easy name to remember)...honda, nissan, toyota and mitsubishi all have their own versions of variable valve timing...

also, as said earlier, vtec is merely a way to allow high rpm aiflow efficiency while still mainting low rpm power...this makes for a more even power band...

 

well this is kind of on the same path as other manufacturers having their own version of variable timing.... but is that what ford's ztec is? Its amazing how cars can do stuff like change depending on what the driver wants... Thanks for the info much appreciated!