Whats the difference between VTEC and VTEC-E?
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Re: Whats the difference between VTEC and VTEC-E? (iphatcrxi)
http://asia.vtec.net/spfeature/vtecimpl/vtec1.html
VTEC was originally designed to get more power out of the car by actively changing the timing and lift during operation. Honda is against boosting their engines so this is their "boost alternative."
VTEC-E is a variation of that in order to improve fuel economy. It's not necessarily the opposite of VTEC... but it can be considered so.
No they're not the same.
VTEC was originally designed to get more power out of the car by actively changing the timing and lift during operation. Honda is against boosting their engines so this is their "boost alternative."
VTEC-E is a variation of that in order to improve fuel economy. It's not necessarily the opposite of VTEC... but it can be considered so.
No they're not the same.
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From: Long Island,, NY, USA
Re: Whats the difference between VTEC and VTEC-E? (iphatcrxi)
quote from the link since you didn't bother to read it
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by link-above »</TD></TR><TR><TD CLASS="quote">"VTEC works as the two cam/rocker pairs operates independently of each other. One of the two cam-lobes are intentionally drawn to be different. The one on the left has a "wilder" profile, it will open its valve earlier, open it more, and close it later, compared to the one on the right. Under normal operation, each pair of cam-lobe/rocker-arm assembly will work independently of each other."</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by link-above »</TD></TR><TR><TD CLASS="quote">"VTEC-E works by deactivating one intake valve."</TD></TR></TABLE>
Basically DOHC/SOHC "performance" VTEC runs always at 16valves, but opens up further during high RPM operation. The SOHC VTEC only operates on the intake valves, while DOHC VTEC uses both intake and exhaust operation. It just changes the opening, and duration of operation. VTEC-E runs in 12valve, the opens up to 16valve during high RPM. It basically uses 1 intake valve per cylinder during normal usage, then opens up both intake valves when you floor it up over whatever RPM it's set to. Very different, yet similar in nature. Read that site.
Modified by eumoria at 8:50 PM 11/25/2004
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by link-above »</TD></TR><TR><TD CLASS="quote">"VTEC works as the two cam/rocker pairs operates independently of each other. One of the two cam-lobes are intentionally drawn to be different. The one on the left has a "wilder" profile, it will open its valve earlier, open it more, and close it later, compared to the one on the right. Under normal operation, each pair of cam-lobe/rocker-arm assembly will work independently of each other."</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by link-above »</TD></TR><TR><TD CLASS="quote">"VTEC-E works by deactivating one intake valve."</TD></TR></TABLE>
Basically DOHC/SOHC "performance" VTEC runs always at 16valves, but opens up further during high RPM operation. The SOHC VTEC only operates on the intake valves, while DOHC VTEC uses both intake and exhaust operation. It just changes the opening, and duration of operation. VTEC-E runs in 12valve, the opens up to 16valve during high RPM. It basically uses 1 intake valve per cylinder during normal usage, then opens up both intake valves when you floor it up over whatever RPM it's set to. Very different, yet similar in nature. Read that site.
Modified by eumoria at 8:50 PM 11/25/2004
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Nov 25, 2004 08:32 PM
