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What's the difference between a HX Coupe and EX Coupe's VTEC Engine?

 
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HX - 12 valves, then 16 then High lift intake
EX- 16 Valves full time, then high lift intake

Do a search. We've been through this at least 2.1 million times.

 
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Here's a site that should answer all your vtec-e (hx) questions.

"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."

Here's two more articles for info:
Edmunds HX review.
CVT transmission article.

It's funny that people buy HX's at all.
Over a dx, you get: power locks and mirros, cruise, tach and alloys for about $1000.
If you buy it for the vtec, it doesn't help performance. Only 2hp more, along with 30lbs heavier than the DX. And their MPG is identical at 32/38 with 5speeds.
If you buy it for economy, you're only saving about $100 a year in gas.
You can't get ABS, power windows, sway bar or a moonroof.
And nobody hardly makes parts for it.
Tear up the motor, and you won't find used parts anywhere.

 
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The HX VTEC-E engine has cam shafts that are configured
for optimum economy. The EX VTEC engine is aimed more
to getting a few more horsepower at the top end of the
torque curve. Both engines have a broad power band and
both have more power than the standard 1.7 liter. The
VTEC-E changes over to the high lift cam profile at about
2600 RPM and will rev to 7000 under high load (a good
hill with your foot to the floor.

 
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I disagree with the "it's funny people buy hx's at all"
I think it's funny people buy LX's all they got over the HX is power windows... and not alloy wheels.
and you said that the fuel economy was the same for 5 speed...
a HX 5 speed has 36 mpg in the city and 44 freeway.
Just my opinion.

 
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Not surprising that you disagree, since you have an HX. Everyone defends their own car.
I just don't see the need for both the LX and the HX. Either one could fit the middle model slot, so why make both? Thats a rhetorical question.
The figures I used for MPG were from KBB.com, which are wrong, I guess.
And IMO, why bother offering alloy wheels on any model if they're only 14" in size.

Seems to me the HX should be the bottom model, for max fuel economy.
The LX should have the 127hp motor, 15" alloys and most of the EX package.
The EX should have the Si motor with a handling package and 16/17" alloys.
Now THAT would be a great lineup. Are you listening, Honda?!

 
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ok since i own an lx.. ill tell you why i got it instead of an ex.. cause i almost bought an ex... for starters.. I hate abs. cant stand it .. never have never will... SECOND... i didnt want a factory alarm cause i planned on a new one ne way... ex cd player? lol not worth the time.. replaced my oem cass. player the second day of ownership, vtec.. bleh 10 more hp.. not worth it.. the only thing that appealed to me in the ex was the sunroof... but for 400 i can get that installed. so 2k more for an ex seemed like a waste imo. and i agree with the statement above me that bellz made.. the dx shouldnt of even been made.

 
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"Seems to me the HX should be the bottom model, for max fuel economy.
The LX should have the 127hp motor, 15" alloys and most of the EX package.
The EX should have the Si motor with a handling package and 16/17" alloys.
Now THAT would be a great lineup. Are you listening, Honda?!
"

I agree with this lineup... I also agree that their is no real need for BOTH the hx and lx... HX OWNS JOOO!!!!

anyway... only thing that pisses me off is that I don't have a rear sway bar...

 
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yea.. well the hx gearing allows it to reach a higher speed than any of our civics.... was it 170 somthing?

 
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bullshit.. i dont believe that for a second... theres nnnnoooooo way 170 i top out at 135... honestly u need a 6th gear..

 
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Here's the proof
download, unzip, open with excell

 
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yea unzip it and show me the file.. i still dont believe that ****..170? noooo way.

 
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As for why people buy the HX, it depends on your priorities.
Mine are smoothness of shifting, quietness on the road, and
the latest in engine technology. I don't miss the power
windows since I can reach both windows from my seat and
I don't have to have the key in the ignition to work them.
The moon roof only adds weight and subtracts an inch from
the headroom. I only regret the lack of ABS, even though in
most situations, the regular brakes are equal. And an HX will
out accellerate an EX any day.

 
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HX has a cool different gearing!

P
R
N
D
S
L

...looks cooler than

P
R
N
D
d3
2

 
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I first thought the S stood for second but it stands
for Sport. Very useful for keeping the revs up.

 
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I would unzip it, BUT there's a friggin 51 k filesize limit, so it has to be zipped, I could e-mail it to you if you want, It's not like i'm gonna give you a virus or something.

and it's 175... Keep in mind, we never said it could actually go that fast... that's just what redline in 5th gear is

 
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I read somewhere that the top speed of a Civic EX is 127 MPH and
is limited.

 
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haha. cool gearing.

it isn't really an automatic, but a continous variable transsmion. CVT.

infinite gears, in a sense.

I'm not sure if S stands for sport, but it does keep the gearing low so you can rev up more and get it going faster.

there's an obvious difference between HX and DX, and fuel economy is what the HX is all about. 44 mpg is very respectable, for a non-diesel, non-hybrid, combustion engine.

plus although its 14 inch, the lightweight alloy wheel is pretty cool. its gay how they have alloy wheel on the HX, but not the EX (well, not till now)

although its 2 extra hp, and although its aim is at fuel economy, I am certainly that through out the powerband, the HX makes more power than the DX/LX's D17A1


the top speed of a 5spd Civic EX is usually around 120. there's no limiter on the 5spd EX... I'm not certain about the auto EX, maybe there isn't one too.

it can't go any faster than 120 ish cuz thats the capability of the engine. heh. course we'll have other peeps claiming other numbers, such as 130 and so on.. which also depends on other factors too...

anyway seems like the engine difference has been covered. (not in depth, but a search will reveal plenty)

btw, the HX has the same exhaust system setup as the DX/LX...