Ok...as some have seen Im not a HONDA guy, I own a Hyundai but whatever it gets me to work. Point of this was that i couldn't find any sort of newbie forum and I had a coupe questions.

1. VTEC: I know it has something to do with the cams and valve timing but WHAT is it? and what makes it so great?

2. Why is it all VTEC engines have high HP numbers but low torque? Again im sureits with the VTEC but why?


Modified by fintile at 8:43 AM 9/14/2007

 

1. http://www.youtube.com/watch?v=AcT_ZyY3F0k
2. Low torque is because of the engine size (it goes up almost linearly with engine size from 1.5L to 1.6 to 1.8 to 2.0 to 2.2), but it's not like Hyundai's 4 cylinders are putting any decent ft/lbs.

And nobody cares if they are on your shitlist.

 

i was talking to the guy at the dealer and he was telling me that it is that it perfect timing to make it a bigger cam on top and a lower on the bottom something like that thats all i got

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ARMANDO_RSX &raquo;</TD></TR><TR><TD CLASS="quote">i was talking to the guy at the dealer and he was telling me that it is that it perfect timing to make it a bigger cam on top and a lower on the bottom something like that thats all i got</TD></TR></TABLE>

lol not quite but i think hes trying to get at least the concept of it to you.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by WhiteOnRice &raquo;</TD></TR><TR><TD CLASS="quote">1. http://www.youtube.com/watch?v=AcT_ZyY3F0k
2. Low torque is because of the engine size (it goes up almost linearly with engine size from 1.5L to 1.6 to 1.8 to 2.0 to 2.2), but it's not like Hyundai's 4 cylinders are putting any decent ft/lbs.
</TD></TR></TABLE>

engine size does matter, but i dont think thats exactly the reason why hondas dont have torque. the Celica GTS makes some decent torque numbers for example.

 

I agree, Honda's are constantly being flamed for being low on torque in comparison to other makers, and I'd say that's why they went with bigger displacement in the K series engines. The tq numbers got better in the recent models because of this.

I'd like to have a K24A2

 

i know a guy that owned a v6 tibby
and now he has a fg2 (2007 civic si)

he told me "oh, now i know what all the rave with the v-tec is about. i was skeptic"

"its like having a small turbo kick in, i love it!"

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iVteC_PoWeR &raquo;</TD></TR><TR><TD CLASS="quote">engine size does matter, but i dont think thats exactly the reason why hondas dont have torque. the Celica GTS makes some decent torque numbers for example.</TD></TR></TABLE>
Not really. The Celica puts about 130 ft/lbs with a 1.8L. B18c1... 128 ft/lbs.

 

I wasn't being a skeptic at all. The past couple months I've had the privilege to watch over my buddies type s while he's deployed. EXACTLY that VTEC is like a mini turbo kick...What i was asking was what is the TECH reason its so great.

To answer white on rice Hyundai engines are putting down some nice trq-HP numbers and whats even better about them is as the HP goes up so does the torque . Mine for instance, yeah its low, but in a stock Hyundai 1.6 slapped with a turbo running 5 psi I get 143whp/ 149trq from a stock hp of 92hp/97trq.

So as im making more HP i also get more trq...Im making more torque than that Type S(not that im any better, also hes putting down 197hp/146trq)!

So to clear it up Im not bashing/flamming the low torque Im just asking why that is.

Sort of a small thought but for a little while I was even considering a K20 swap...the engine bay is just the right size and everything is set up in the same way in the RSX as it is in my Accent so no engine bay cutting will be needed, but then my buddy decided to turbo his car rather than swap in a K24 so yeah.

 

k20 swap in a hyundai accent would be pretty gangster

 

A simple google or even wikipedia search would tell you exactly what vtec is and how it works. If you consider this a bad reply, then so be it. But do a search then ask specifics.

Also note that a 1.8 liter engine is 1.8 liters. Coompare the Honda motors to others liked-sized and the torque numbers will be about the same. The HP, though--Honda has most everyone beat.

And you can't compare turbo displacement numbers to all-motor torque.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Todd00 &raquo;</TD></TR><TR><TD CLASS="quote">And you can't compare turbo displacement numbers to all-motor torque.</TD></TR></TABLE>
Damn, you beat me to it.

 

ya

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Todd00 &raquo;</TD></TR><TR><TD CLASS="quote">

Also note that a 1.8 liter engine is 1.8 liters. Coompare the Honda motors to others liked-sized and the torque numbers will be about the same. The HP, though--Honda has most everyone beat.

And you can't compare turbo displacement numbers to all-motor torque.</TD></TR></TABLE>

This is correct. Hondas are not low on torque. They are exactly where the should be in relation to their engine displacement. Idiots and haters are the only ones who think honda engines have no torque,as they have no clue about natrually aspirated engine dynamics

 

oy...again...i wasnt saying anything negative about it I just want to know why they have such a HUGE curve between HP and torque. RSX type S K20: 177whp stock with 140 torque...why the big curve?

 

Are you that stupid? Look most other N/A 2.4L and under 4 cylinders?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fintile &raquo;</TD></TR><TR><TD CLASS="quote">oy...again...i wasnt saying anything negative about it I just want to know why they have such a HUGE curve between HP and torque. RSX type S K20: 177whp stock with 140 torque...why the big curve?</TD></TR></TABLE>

because its only displacing 2 liters...why is that hard to understand??? The high hp numbers come from the great honda head, but not even honda can make a small displacement motor generate large amounts of torque N/A

 

THANK YOU Cb7-R!!! The heads...the VTEC in the heads are creating the larger HP number and white on rice the torque is exactly where it should be for a 2.0, I understood that the first time you posted it. The displacement makes the torque. what I wanted to know was WHY THE CURVE with the HP... Thanks to Cb7-R it finally was made clear. What i wasnt getting was the connection with VTEC and the higher HP i thought that it was just a way to save fuel when at higher RPm like most valve timming.
I should have made the last couple of post clearer.

 

Yay. Go V-tec!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fintile &raquo;</TD></TR><TR><TD CLASS="quote">THANK YOU Cb7-R!!! The heads...the VTEC in the heads are creating the larger HP number and white on rice the torque is exactly where it should be for a 2.0, I understood that the first time you posted it. The displacement makes the torque. what I wanted to know was WHY THE CURVE with the HP... Thanks to Cb7-R it finally was made clear. What i wasnt getting was the connection with VTEC and the higher HP i thought that it was just a way to save fuel when at higher RPm like most valve timming.
I should have made the last couple of post clearer.
</TD></TR></TABLE>
Yes but not all VTEC's are created equally. There are 5 diffrent VTEC configurations and only the system in the DOHC motors are used to create more power. Other VTEC systems are for better fuel efficency to diffrent degrees...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cb7-R &raquo;</TD></TR><TR><TD CLASS="quote">
Yes but not all VTEC's are created equally. There are 5 diffrent VTEC configurations and only the system in the DOHC motors are used to create more power. Other VTEC systems are for better fuel efficency to diffrent degrees...</TD></TR></TABLE> Damn, I was just about to say that most of the cars with vtec are are using it more for better gas mileage than power. For the DOHC's.

 

That too is something i wondered. i had asked that to another friend, but yeah it looks as if Honda is the only one using the DOHC VTEC for power. Its a damn good bit if mechanics, I cant see why other wouldnt use it for power and MPG like the I-VTEC. Well thanks for the help guys.

 

Honda isn't the only one... Mitsubishi used MIVEC on the Evo.

 

Yeah many manufacturers has it, toyota, mitsu, i think audi has something similar

 

Toyota's is VVTLI I think...

I know it's on the Corrolla XRS...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fintile &raquo;</TD></TR><TR><TD CLASS="quote"> it looks as if Honda is the only one using the DOHC VTEC for power. </TD></TR></TABLE>
Well, he is right about this. Nobody else is using V-Tec. lol