Engine & Internal Chat about beefing up your engine's insides here.

why do vtec car have more horse power

  #1  
Old 12-31-2007, 06:47 AM
Member
Thread Starter
Join Date: Nov 2007
Location: o.c/fresno ca
Posts: 263
Default why do vtec car have more horse power

i was wondering why do vtec honda have 15 hp more the reguler package hondas...
is it cause of vtec do they have anything else more...pistons head anything else..
or is it that they have a higher cam lobe...
DONT BE SCARED TO ANSWER MAN IM JUST ANOTHER GUY TRYING TO LEARN
BOUT HIS CAR AND ENGINE SO ANYTHING U GUYS GIVE ME IS A BLESSING
SO JUST THROW UR 2CENT IN THERE
THANKS

i.e
if i dont have vtec and i was to put a higher cam lobe
will it be like vtec....

thanks
 
  #2  
Old 12-31-2007, 08:07 AM
Been Around A Long Time Member
Join Date: Nov 2006
Posts: 2,631
Default RE: why do vtec car have more horse power

google vtec and read about it on wiki or somewhere. i has to do with different cam profiles at different rpms.
 
  #3  
Old 12-31-2007, 10:10 AM
live2rice's Avatar
Super Moderator
Join Date: Oct 2006
Location: Alaska
Posts: 8,713
Default RE: why do vtec car have more horse power

more aggressive cams is not the same as vtec, you will probably make more power than vtec, but it will be all the time where as vtec is just engaged at certian rpms
 
  #4  
Old 12-31-2007, 10:44 AM
Been Around A Long Time Member
Join Date: May 2007
Posts: 1,357
Default RE: why do vtec car have more horse power

Head design and flow characteristics, camshafts, pistons, engine geometry...
 
  #5  
Old 12-31-2007, 04:20 PM
Member
Thread Starter
Join Date: Nov 2007
Location: o.c/fresno ca
Posts: 263
Default RE: why do vtec car have more horse power

Yea i read all bout vtec engage when it hits likes 4k or 5k rpm da rocker engages n lets it breath better....
it stays open longer n wont let da motor stress n all da good stuff u know,...lol

i mean is it just cuz of that rocker that is giving it 15 horse power....
so wen it opens at high rpms it giving it 15 horse power..

thanks guys...
 
  #6  
Old 12-31-2007, 06:17 PM
Join Date: Mar 2007
Posts: 210
Default RE: why do vtec car have more horse power

With vtec the engine effectively has two different sets of cams, one with a conservative valve timing configured to give good low and mid range performance with decent economy at lower and mid range rpm like any shopping trolley car, the other cam is configured to give higher performance at higher rpm when economy is also of relatively little concern. In operation the 'normal' cams operate the valves most of the time (shorter valve opening time, less valve overlap, maybe less lift), but at a specified higher rpm point the 'racier' cams overide the normal cams and give longer valve opening time, more overlap, and maybe more lift. It's like having'sports' cams but without the downsides of poor low end performance and economy.
 
  #7  
Old 12-31-2007, 07:38 PM
Member
Thread Starter
Join Date: Nov 2007
Location: o.c/fresno ca
Posts: 263
Default RE: why do vtec car have more horse power

ORIGINAL: JohnL

With vtec the engine effectively has two different sets of cams, one with a conservative valve timing configured to give good low and mid range performance with decent economy at lower and mid range rpm like any shopping trolley car, the other cam is configured to give higher performance at higher rpm when economy is also of relatively little concern. In operation the 'normal' cams operate the valves most of the time (shorter valve opening time, less valve overlap, maybe less lift), but at a specified higher rpm point the 'racier' cams overide the normal cams and give longer valve opening time, more overlap, and maybe more lift. It's like having'sports' cams but without the downsides of poor low end performance and economy.

THANKS U ANSWER MY QUESTION HALF WAYS....
I DIDNT KNOW SOME OF DIS INFO
BUT I STILL WONDER WHY DOES VTEC ENGINES HAVE 15 EXTRA HP...
IS IT JUST CAUSE OF VTEC....
SORRY TO ALL U GUYS IF IM BEEN PERSISTENT...
ITS JUST Y DO VTEC ENGINES HAVE 15HP
THANKS...
 
  #8  
Old 12-31-2007, 09:01 PM
Member
Join Date: Feb 2007
Location:
Posts: 192
Default RE: why do vtec car have more horse power

  #9  
Old 12-31-2007, 09:19 PM
Member
Join Date: Jun 2007
Location:
Posts: 131
Default RE: why do vtec car have more horse power

ORIGINAL: JohnL

With vtec the engine effectively has two different sets of cams, one with a conservative valve timing configured to give good low and mid range performance with decent economy at lower and mid range rpm like any shopping trolley car, the other cam is configured to give higher performance at higher rpm when economy is also of relatively little concern. In operation the 'normal' cams operate the valves most of the time (shorter valve opening time, less valve overlap, maybe less lift), but at a specified higher rpm point the 'racier' cams overide the normal cams and give longer valve opening time, more overlap, and maybe more lift. It's like having'sports' cams but without the downsides of poor low end performance and economy.
Can't get more of a "spoon-fed" answer than that. Here's another spoonful: if you put a performance cam in your non-vtec then you will get the additional power without the fuel economy.

And please turn off the cap-lock, thanks.
 
  #10  
Old 12-31-2007, 10:56 PM
Member
Thread Starter
Join Date: Nov 2007
Location: o.c/fresno ca
Posts: 263
Default RE: why do vtec car have more horse power

Yea my bad bout my cap lock....
its a bad habit....
yea i understand what all u guys are trying to feed me and all..
i gotwat JOHNL told me i understand dat two cams two different opening times.
onesfor economicsideit runs in da low end mid rpms
da other is wen u over do ur rpmsi.e wen racing or testing ur engine...

all im saying da second cam da one dat kicks in is da one dat is giving it da extra 15 hp...

sorry just a persistent person...
all um saying is i know how vtec works i know how it kicks in i knowdat is a xtra rocker dat kicks in wenda rpms fuelare high..
but isit da cam dat lets it have 15hp extra...thanks....

HAPPY NEW YEARS TO ALLU GUYS
HOPE U GUYS HAVE A SAFE ONE TOO.
N HAPPY NEW YEARS TO UR FAMILYS....
 

Thread Tools
Search this Thread
Quick Reply: why do vtec car have more horse power


Advertising

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.