Difference between V-Spec and VTec

Post by **Toahk** » Sat Apr 12, 2003 9:43 am

I know the acura has vtec and nissan has spec-v, but what exactly do these do?

Post by **MainEvent212** » Sat Apr 12, 2003 9:43 am

no... as far as i know V-Spec is just a trim model and nothing more

V-tec is a variable valve system that involves a more agressive cam file that is switched over to when the oil pressure hit's a ceartin point...

two completely unrelated things

Post by **maxpower** » Sat Apr 12, 2003 9:43 am

mainevent212 wrote:no... as far as i know V-Spec is just a trim model and nothing more

V-tec is a variable valve system that involves a more agressive cam file that is switched over to when the oil pressure hit's a ceartin point...

two completely unrelated things

so in a vtec engine, the valves change? do they turn red, or just grow bigger?

Post by **MainEvent212** » Sat Apr 12, 2003 9:43 am

no...actualy if u read for like 2 seconds...the cam changes

it slides over onto the more aggressive cam file (a secondary setting) when the V-Tec solenoid is activated (due to higher oil pressure at high RPM) the cam just slides over from what i understand

Post by **maxpower** » Sat Apr 12, 2003 9:43 am

Toahk wrote:I know the acura has vtec and nissan has spec-v, but what exactly do these do?

Read this brief overview. it has animations and such to help you out...http://auto.howstuffworks.com/question229.htm

Post by **maxpower** » Sat Apr 12, 2003 9:43 am

maxpower wrote: lol quoted myself

iirc, the valves in a honda motor do not evolve. get your facts straight.

Post by **MainEvent212** » Sat Apr 12, 2003 9:43 am

dude wtf are you talking about?

that has nothing to do with what i said...and the explenation at How Stuff Works is exactly what i said, just more complex...*******

Post by **240canuck** » Sat Apr 12, 2003 9:43 am

ok I got a real question what sis the difference between Honda's VTEC and Nissan's CVVTS sysytem's????

Post by **Nismo1182** » Sat Apr 12, 2003 9:43 am

240canuck wrote:ok I got a real question what sis the difference between Honda's VTEC and Nissan's CVVTS sysytem's????

Nissans NEO VVL and Hondas VTEC is the same thing.

As to how VTEC works, usually there are 2 cam lobes for 2 intake and exhaust valves on twin cam 16V engines, expept SR20 but im just generalizing. The cams on lets say a B16 has 3 lobes. 2 are normal lobes used for normal low rpm driving. The lobe in the middle has higher lift and more duration. Each lobe has its own rocker arm. When vtec is activated, oil pressure forces pins to lock the rocker arms together and the valves are forced to follow the middle lobe.

Post by **MainEvent212** » Sat Apr 12, 2003 9:43 am

ohhh i always thought the cam shifted...but that seemed a lil sketchy to me

thanks for clearing that up...not that i'd ever need it...unless i did a b-series swap into my 240...LMAO

Difference between V-Spec and VTec

Difference between Spec-V and VTec

Re: Difference between Spec-V and VTec

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