VTEC vs. regular engine
bboy Wesley West
Joined: Oct 2003
Posts: 15,390
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From: six-five-o
Originally Posted by redgoober4life
Meh.
Guy at the track ran a 17.4 as his best time with a 5 speed 94 accord EX (VTEC). I ran a 17.7 best time with an automatic '97 SE (no-vtec).
Both are slow.
It's mainly to keep the engine's power curve smooth. (although you'd only notice it back to back). I don't believe there is a mileage issue between the two (i think the non-vtecs get, maybe, 1 more mpg then the vtecs).
Guy at the track ran a 17.4 as his best time with a 5 speed 94 accord EX (VTEC). I ran a 17.7 best time with an automatic '97 SE (no-vtec).
Both are slow.
It's mainly to keep the engine's power curve smooth. (although you'd only notice it back to back). I don't believe there is a mileage issue between the two (i think the non-vtecs get, maybe, 1 more mpg then the vtecs).
Rotorphile.
Joined: Mar 2002
Posts: 10,120
Likes: 0
From: Richmond, VA
Originally Posted by dosmastr
(...)
VTEC-E hydrolically deactivates valves at low RPM to save gas (similar in general concept to the old school "12" valve CVCC heads,) and locks in all 16 for normal power at high RPM. This system is best illustrated in the 92-95 Civic VX's D15Z1 engine. Newer Honda motorcycles use a similar system.
VTEC uses a normal set of cam lobes at low RPM (all on all 16 valves) while it hydrolically engages an extra set of rocker arms, which ride on aggressive lobes, to give greater high RPM power. The only difference between SOHC VTEC and DOHC VTEC is obviously the the extra cam and rocker set. Examples include the 92-95 Civic Si's D16Z6 and the 92-93 Integra GS-R's B17A1.
That said, I've never seen a '94 run at the track... only a 4G that ran a night's best of 17.1. :chuckles:
Blah h22a Blah
Joined: Nov 2003
Posts: 694
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From: Atlanta
Originally Posted by wedley2
that guy doesnt know how to drive, 145 hp 5 spd should get an accord to at least high 16's.
Shit I got a non vtec 94 4door and I can run a high very high 15. Normal mods.
h:
Joined: Jan 2004
Posts: 6,692
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From: Bethlehem PA
Originally Posted by atlaccordguy
Shit I got a non vtec 94 4door and I can run a high very high 15. Normal mods.
99 si runs like high 15's i believe.
With your normal mods and the bigger factor weight/ power, i doubt your getting into the 15's.
Si is lighter and has more power and gets in the high 15's maybe even 16's.
Post the slip....
Joined: Jan 2004
Posts: 6,692
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From: Bethlehem PA
My other car is dyno'd @ close to 300hp @ 10psi, and I remember hitting the 1/4 in mid to low 13's ( im looking for the slip in my pc, got it scanned ).
I cant drive for shit, and im sure the car can go alot faster than that but no one but me drives it. So with normal mods, I doubt it.....I think we all doubt it.
I cant drive for shit, and im sure the car can go alot faster than that but no one but me drives it. So with normal mods, I doubt it.....I think we all doubt it.
