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Old 10-08-2009, 12:18 AM   #1
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Default VTEC-E

What exactly is/was VTEC-E?Is it still being used?
As far as I know from reading up on it a little it was used in single cams to increase mpg. Is that what it is?
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Old 10-08-2009, 01:36 AM   #2
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Yes. It was still being used, in the early 2000s HX models AFAIK, but I would think the Hybrid pushed that out of the lineup completely.

It's basically the most simple form of VTEC possible. It simply utilizes one intake valve per cylinder until a certain RPM, which is 2800 I believe, in the 96-00 Civic HX. Then it opens up the second after that. So basically, during normal driving, you're using one intake valve, and essentially pumping less air/fuel into the engine, substantially increasing your fuel mileage. I believe the 5 speeds were rated at something like 34/39 initially before the new ratings got to them. Now I think they're still at 30/35.

I'm actually looking for a five speed HX. They're ridiculously hard to find A. not riced out, B. not sitting at a car lot at twice KBB for many months, because some scumfvck dealer wants to rape some naive person by telling them "when gas hits $5 a gallon..." and C. without a hell of a lot of miles, because, obviously, most bought them to save money on gas, which is perfect for long commutes, and not for sitting in the garage. I actually called about one in Chicago recently. Some ***** put one on CL, and put one picture of the passenger side of the car. I called, and sure enough, the guy was asking $300 over KBB "firm" and the car had damage to the driver door and quarterpanel from an accident. It also needed some small stuff, like a window motor and AC recharging etc. I asked him for some pics of the damage but he never sent them.

As far as tuners go, some here think they are theoretically quicker than an EX, with the EX gearing, since it supposedly has better power under the curve to make up for the deficit of 12(which is 10%) peak HP. It'd be pretty hard to decisively find out, since all cars are a little different I guess. I guess they use the roller-rocker valvetrain, which increases the potential for a big cam, but I don't know enough to get into that.
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Old 10-08-2009, 06:20 AM   #3
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Default Re: VTEC-E

they actually rated the 5 speed at 37/43 mpg, on trips I can still get 40-42 mpg in my 97 hx w/ 182k miles averaging 410-430 miles per tank and the lowest I remember ever seeing I got 375 miles and that must've been around town a lot.
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Old 10-08-2009, 06:29 AM   #4
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I traded a GSR motor for a nice 5-speeed 99 HX that I fixed and sold to a friend (made bank on that trade, lol). It was a 5-speed, but the original transmission **** the bed and I had to replace it with a Z6 tranny. Made the car a lot more fun to drive

The EGR system on those beasts clog very easily, so watch for that.
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Old 10-08-2009, 06:32 AM   #5
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Default Re: VTEC-E

Yea these engines were only used in the HX weren't they? They also used a CVT transmission for auto's, if I recall correctly.
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Old 10-08-2009, 06:39 AM   #6
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Default Re: VTEC-E

The 1992-1995 VX hatchback with VTEC-E was rated at 55 mpg highway.

http://www.edmunds.com/insideline/do...rticleId=68272

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Old 10-08-2009, 06:40 AM   #7
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Default Re: VTEC-E

i learned something
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Old 10-08-2009, 06:47 AM   #8
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http://www.b18c5eg.com/VTEC/sohcvtece.html

Quote:
Originally Posted by
VTEC-E is a twist on the regular VTEC mechanism. Whereas VTEC's purpose can be more or less summarized as: extracting high RPM performance while maintaining smooth low RPM operation, VTEC-E can be summarized as: allow extremely lean fuel-air mixture at low RPMs in order to increase fuel economy. In other words, VTEC technology is used to optimize different ends of the RPM range in the two different implementations

First, some background information. Fuel is mixed with air and then combusted in cylinders to make torque. How much torque is generated is affected directly by how much and how well the fuel and air are mixed together. Less fuel and more air is called a "lean" mixture, the opposite is called a "rich" mixture. For low RPMs, a normal engine's intake charge velocity is low enough that the fuel and air are not mixed together very well. To make up for the sub-optimal mixing effect, a slightly rich fuel/air mixture (more fuel) is needed to maintain smooth operation. VTEC-E artificially increases the intake charge velocity, which creates a swirling effect inside the cylinder. This promotes a very good mixture of the fuel and air, thus allowing a lean fuel/air mixture to be used. The result of this is great fuel economy when running at low RPMs. Indeed, the current Civic HX, a 2400lb coupe, is capable of 37cty/44hwy fuel economy from a 115hp 1.6L VTEC-E engine. Now lets see how VTEC-E works in detail.

Unlike regular VTEC mechanisms, there aren't any extra cam lobes in a VTEC-E engine. So each pair of valves works off of exactly two cam lobes. Since VTEC-E merely increases the low RPM intake charge velocity, it is a mechanism that only affects the operation of the intake valves. VTEC-E is found only in SOHC engines due to its economical intentions. All this means that we only have to look at the two intake cam lobes and the associated rocker arms and valves in order to gain a full understanding of VTEC-E.

A non-VTEC-E engine normally has one single cam profile for the intake valves. A VTEC-E engine has two different intake cam profiles. At low RPMs, each intake valve works from its own intake cam profile. One of the intake cam profiles is very normal looking. The other one, however, is almost perfectly round, with just enough profile to it so that it pushes the valve open just enough to avoid pooling of fuel above the valve lip. Therefore at low RPM, only one intake valve is opening and closing. Most of the intake fuel and air are squeezed through this one valve, resulting in a good swirling effect in the cylinder. The swirling effect optimizes the fuel/air mixture, thus allowing a very lean mixture to be used.

As the RPMs increase, the demand for more fuel/air rises as well. Once a certain RPM is reached (approximately 2500RPM for the Civic HX), the one-intake-valve configuration starts to become a significant intake restriction. At this time, a solid pin is pushed through the two intake valve rocker arms, thus binding the two rocker arms into a single unit. This causes both intake valves to open and close according to the normal cam profile, while the almost-round cam profile is no longer used.

VTEC-E is some times confused to be just another high-RPM optimizing mechanism like other VTEC variants. And there is some truth to this: since only one intake valve is used at low RPMs, the one normal cam lobe is made to open that one valve slightly taller and for longer duration than if both intake valves are used. At higher RPMs, both valves follow this same cam lobe so they are both opened slightly taller and for longer duration. This results in a slight improvement in high RPM breathing compared to non-VTEC-E engines and thus slightly more power. This is evident by comparing the Civic DX and Civic HX engine. The two engines are essentially the same except for the VTEC-E in the Civic HX. But the Civic HX's VTEC-E mechanism results in 115hp, versus 106hp from the Civic DX. So the Civic HX has more power in addition to better fuel economy. But make no mistake, VTEC-E is designed with economy as the primary goal, not power output.
VX pistons are very different looking from a normal civic piston...they have a MASSIVE dish to promote this "swirling" effect.



A "normal" Civic piston looks like this

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Old 10-08-2009, 07:46 AM   #9
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Default Re: VTEC-E

I had a Civic VX. God I hated that engine lol
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Old 10-08-2009, 07:48 AM   #10
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Default Re: VTEC-E

Quote:
Originally Posted by BauleyCivic View Post
The 1992-1995 VX hatchback with VTEC-E was rated at 55 mpg highway.

http://www.edmunds.com/insideline/do...rticleId=68272


Damn it. I knew there was a HB with that motor.
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Old 10-08-2009, 07:52 AM   #11
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Default Re: VTEC-E

Search.

I had a JDM vtec-e D15B. Worst. Engine. Ever. God I hated how slow that thing was and the gas mileage wasn't even that great for me probably 30ish (probably because I beat the **** out of it just to go anywhere and I had the EX/Si tranny so 3~4k on the freeway was standard).

edit: Also <2500 rpm when "vtec-e" kicked in it was slower than my fat mom trying to chase a donut.

Last edited by tazeat; 10-08-2009 at 08:19 AM.
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Old 10-08-2009, 08:13 AM   #12
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Default Re: VTEC-E

I have a 94 Civic VX with the stock D15Z1 with VTEC-E. good solid motor, the first one lasted 400,000miles before the valve stem seals and the rings got bad enough to warrant a change. I picked up a spare Z1, rebuilt it and threw that in.

There are also other versions of VTEC-E across the pond in the D15B over in Japan, Europe, Russia, etc...

VTEC-E can engage anywhere from 2500-3500RPM depending on engine load and coolant temps.
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Old 10-08-2009, 08:28 AM   #13
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Default Re: VTEC-E

Quote:
Originally Posted by tazeat View Post
Search.

I had a JDM vtec-e D15B. Worst. Engine. Ever. God I hated how slow that thing was and the gas mileage wasn't even that great for me probably 30ish (probably because I beat the **** out of it just to go anywhere and I had the EX/Si tranny so 3~4k on the freeway was standard).

edit: Also <2500 rpm when "vtec-e" kicked in it was slower than my fat mom trying to chase a donut.
Your an idiot to think that by beating on a motor and still getting "30ish" mpg makes it the worst motor ever.

And your edited Eminem "I hate my mom" comment proves your idiocy.

Thanks.
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Old 10-08-2009, 08:33 AM   #14
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I love my death trap 94 Civic VX. 55mpg FTW!!!
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Old 10-08-2009, 08:35 AM   #15
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Quote:
Originally Posted by BauleyCivic View Post
The 1992-1995 VX hatchback with VTEC-E was rated at 55 mpg highway.

http://www.edmunds.com/insideline/do...rticleId=68272

I had one of these and it does get 55 MPG.. well, I still have it but it has had a GSR engine for the last 6 years and now gets ~30 MPG all around..
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Old 10-08-2009, 08:36 AM   #16
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Default Re: VTEC-E

I used to have an auto hx, i replaced the blown tranny with a b000 tranny and that thing was more fun to drive. Good solid motor too. That thing lasted me 150k+ till i spun a bearing for oil starvation.
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Old 10-08-2009, 08:48 AM   #17
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Quote:
Originally Posted by ImportechPerformance View Post
Your an idiot to think that by beating on a motor and still getting "30ish" mpg makes it the worst motor ever.

And your edited Eminem "I hate my mom" comment proves your idiocy.

Thanks.
No that is not why it was the worst motor. It was terrible motor because it was so slow and lacked any inclination of fun.

Getting 30ish mpg is fine, no problems with that.

I beat on it because it was a $500 motor I picked up because I didn't have much money (student, wasn't working a ton) after the stock d16z6 blew up. I didn't keep it long. shortly after I put it in I sold the car. I hated it.
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Old 10-08-2009, 11:45 AM   #18
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Originally Posted by Uncle Ben's View Post

As far as tuners go, some here think they are theoretically quicker than an EX, with the EX gearing, since it supposedly has better power under the curve to make up for the deficit of 12(which is 10%) peak HP. It'd be pretty hard to decisively find out, since all cars are a little different I guess. I guess they use the roller-rocker valvetrain, which increases the potential for a big cam, but I don't know enough to get into that.
Circa September 1998...

My cousin had a 96 Civic HX coupe, I had a 95 Civic Si hatchback, both cars were stock. We raced a few times and I beat him every time. It wasn't even close.

And since you mentioned it, I don't see HX's around here any more.
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Old 10-08-2009, 11:54 AM   #19
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<--- HX Coupe


...


201 peak whp though . The Y5 lasted all of about 4 days before I swapped it out hah.
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Old 10-08-2009, 12:08 PM   #20
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My HX that got ****ed while parked - FEMALE DRIVER. I would kill her if they allowed vigilante justice. Not because of the car (it was freaking HX with a stock Y5) but on principle; My car is worth more to me than you are.

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Old 10-08-2009, 12:39 PM   #21
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Default Re: VTEC-E

Thanks guys, I know I learned something.
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Old 10-08-2009, 01:29 PM   #22
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2001-05 Civic EX's with D17a2's have Vtec-E. The K20a3 also has another variation of it.
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Old 10-08-2009, 02:24 PM   #23
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Quote:
Originally Posted by BauleyCivic View Post
The 1992-1995 VX hatchback with VTEC-E was rated at 55 mpg highway.

http://www.edmunds.com/insideline/do...rticleId=68272

God I miss that car. I had a white VX. Bought it by mistake cause I was young and stupid - when the dealer popped open the hood and I saw "VTEC-E" I immediately thought "OMG it's an SI! So an SI and a VX must be the same thing since they both have VTEC engines!" I was 16 and it was 1995, cut me some slack.

Still though, these were the days when gas was, very literally, .99 cents. I would drive aimlessly all the time...explore SoCal and learn the freeways & streets. It was great while it lasted.
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