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Discussion Starter #1
Ok guys, so I am thinking of possibly selling my ej1 with z6, in favor of a civic a little newer (6th or 7th gen). I was also thinking, I might as well get one with a d1x vtec-e since I am no longer concerned with making my dd honda fast, I am thinking of the route of a nice mpg queen civic dd.

Now, I have always heard alot of back and forth about the d17 vtec system. I completely understand how vtec works, and how vtec-e works, and 3 stage vtec works, but cannot find a straight answer about the d17 heads. I have heard that the d17a2 found in the US Civic EX was regular sohc vtec like in the z6 and y8. But I have also heard that that the d17a2 from the ex was actually vtec-e like the z1 and y5. What is the truth about this? I know the d17a1 in the dx/lx is sohc non vtec, but am not sure about the EX d17a2 being vtec or vtec-e. Plz help me with a concrete answer. Thanks guys!
 

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\/Your Mom Was Here\/
Vibe GT
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From wikipedia:

D17A6 VTEC-E

Found in:
2001–2005 Honda Civic HX
Displacement : 1,668 cc (101.8 cu in)
Bore and Stroke : 75 × 94.4 mm (3.0 × 3.72 in)
Compression : 9.9:1
Power : 117 hp (87 kW; 119 PS) at 6,100 rpm[8]
Torque : 111 ft·lb (150 N·m) at 4,500 rpm[8]
Valvetrain : SOHC VTEC-E Lean Burn (4 valves per cylinder)
VTEC Switchover : 2,300 rpm
Fuel Control : OBD-2 MPFI

D17A2 VTEC
Found in:
2001–2005 Honda Civic EX (US only)
2001–2005 Honda Civic LX (Europe)
2001–2005 Honda Civic Si (Canada only)
2001–2005 Acura 1.7 EL (Canada only)
2000–2007 Honda Stream 1.7 (Japan)
Displacement : 1,668 cc (101.8 cu in)
Bore and Stroke : 75 × 94.4 mm (3.0 × 3.72 in)
Rod Length : 137 mm
Rod/Stroke : 1.48
Compression : 9.9:1
Power (North America): 127 hp (95 kW; 129 PS) at 6,300 rpm
Japan: 125 PS (92 kW; 123 hp) at 6,300 rpm[6]
Torque (North America): 114 lb·ft (15.8 kg/m, 154 Nm) at 4,800 rpm[7]
Japan: 154 N·m (114 lb·ft) at 4,800 rpm[6]
RPM redline: 6,800 rpm
Rev-limiter : 7,200 rpm
Valvetrain : SOHC VTEC (4 valves per cylinder)
VTEC Switchover : 4,500 rpm
Fuel Control : OBD-2 MPFI

Does this answer your question?
 

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Discussion Starter #4
I had read the wikipedia write up on the d17 engines, but I always heard the ex was actually vtec-e instead of vtec, I was just making sure.
 

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I had read the wikipedia write up on the d17 engines, but I always heard the ex was actually vtec-e instead of vtec, I was just making sure.
I have also reaserched this and have found many disagree that your EX D17 is VTEC-E. Yes it works the same way 12V to 16V

The reason they claim its not VTEC-E is because your not going to get the same sort of economy from this engine as you would in a D16 VTEC-E.

D17 EX has alot more power and less economy.

they say...

So what I think is that our engines lay somwhere between performance and economy.


This is what I have googled. I am not saying it is or it isant.
Just somthing to think about. Honda did leave the E off the spark plug cover....

I was disapointed after purchasing mine, but its still a good car.
 

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Discussion Starter #7
still makes it sound like their not vtec (vtec, in my opinion, is switching to a larger cam profile at a certain rpm... going from 12v to 16v just seems like vtec-e, not vtec)
 

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A D17A2 is VTEC(more for economy then power, but not yet the Hx economy). If your not concerned about speed/power and more concerned about economy why are you even asking this question?
 

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Both the D17A2, And the D17A6 are VTEC-E. The real diffrence in the 2 engines are the Cam profile, and the ECU. EVERYTHING can be swapped, Im actually running an A2 bottom end with an A6 head (with Stage 2 ex turbo cam). The VTEC works the same on both! just diffrent tune and diffrent VTEC activation point!
 

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still makes it sound like their not vtec (vtec, in my opinion, is switching to a larger cam profile at a certain rpm... going from 12v to 16v just seems like vtec-e, not vtec)

I get where your coming from .

VTEC is Variable Valve Timing Engine Control regaurdless of 12v to 16V or larger cam switching.

Your D17 "VTEC-E" does not have crappy small intake and throttle body and will out perform a real VTEC-E engine.

its basicly econmy to normal...

your D17 still makes more power then a real D15/D16 VTEC-E.

To get a real VTEC-E put on a smaller intake manifold and smaller TB with smaller valves and floppy valve springs.

But yeah even I call it VTEC-E




Here is what I dont get.....

Guys with a civic LX (correct me if I am wrong) put on a D17 VTEC-"E" head and get gains?? over a D17 16V non vtec? (or D15?)
 

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My Seventh generation Civic came stock with a D15B block and a D15Y4 head (head casting code: PLE2). Although the valve cover says VTEC, is still VTEC-E? When I unplug the VTEC and drive the car drives smoothly unit about 4,500-5,000 RPM when the engine runs rough until the tachometer falls once again.
 
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