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yact...

W

Wadded Beef

Banned
when does vtec turn on for an '04 accord 4 cyl?

edit: at which RPM does vtec change timing and lift? there, now u can't give sarcastic answers hahaha...though i'm sure you'll find a way :brokenheart:
 
actually it is 2200 rpm.

The 2.4 in the accord has a pussy ass variant of vtec used to improve fuel economy more than anything else. The motor runs as a 12 valve motor below 2200 rpm where it only opens one intake valve/cylinder.


The Second System (K20A3):

This system does not really conform to the "DOHC i-VTEC" nomenclature, as Honda would like us to believe. As I mentioned in my previous post, it actually should be called "i-VTEC-E," because it uses a VTEC-E mechanism rather than a standard VTEC mechanism. At low RPM, the VTEC-E system effectively forces the engine to operate as a 12-valve engine - one of the intake valves does not open fully, thus decreasing fuel consumption. At 2200RPM, the VTEC-E system engages the 2nd intake valve, effectively resuming operation as a normal 16-valve engine. There are no high-RPM performance cam profiles; this engine is tuned to balance fuel economy and power, rather than provide pure performance. On the intake cam, there is the VTC mechanism which basically is an automatic self-adjusting cam gear used to continuously optimize the valve overlap for all RPM ranges. This being a VTEC-E system - and not a true DOHC VTEC system - is the reason the K20A3 redlines at a measly 6800RPM, while the K20A2 is able to rev all the way to 7900RPM.

This system is used in engines powering the USDM Acura RSX base, Honda Civic Si, Accord 4-cylinder, CRV, and Element.

link
 
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