Bense

okay so, the SOHC non-vtec d16y7 has 106 hp
where as the SOHC vtec-e d16y5 yields 115 hp

now, from what i've read in the past (a while back) all of the d16y* have the same exact block, the only difference is the cylinder head, y7, y5, and y8

now since the y8 has SOHC VTEC, it's got the primary lobes as well as the secondary vtec lobes. So obviously, the y8 uses a different camshaft as the y5 and the y7

the only thing that i can think of, is that the d16y5 cam is slightly more aggressive than the y7 camshaft. why do i think this? well, VTEC-E operates by disabling one of the intake valves to allow less air being drawn into the combustion chamber. Too much air in low RPMs tends to do more harm than good. With that said, i hypothesize that the d16y5 has a slighty more agressive camshaft than the d16y7

does anyone know if this is true?

civicholo

i would guess the reason the y5 has more hp is because of the vtec-e. i don't think it matters if it's vtec or vtec-e. it just the vtec.

Slow EJ8

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civicholo &raquo;</TD></TR><TR><TD CLASS="quote">i would guess the reason the y5 has more hp is because of the vtec-e. i don't think it matters if it's vtec or vtec-e. it just the vtec.</TD></TR></TABLE>

No. Vtec and Vtec-e are very different and are made for 2 different purposes.

To the OP I am not sure but interesting ideas about it. In for the answer as well.

Ghetto Civic HX

Maybe the roller rocker in the y5 head have less parasitic loss than in the y7? I also thought I saw somewhere that the y5 has a slighty higher comp. ratio. But I didn't save the link, and I can't find that info now.

Edit: Here's the link. It's from MSN's auto section. If you go down to engice specifications, it lists all the differences.

[URL]/http://autos.msn.com/research/vip/spec_engines.aspx?year=2000&make=Honda&model=Civic &src=src[URL]

robtheslob

im preaty sure that the reason for the extra horse power is becasue they use the same cam as the y8 head but with out the 1 intake lobe because the y8 makes the same 115hp





Modified by robtheslob at 5:06 PM 9/6/2005

Bense

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by robtheslob &raquo;</TD></TR><TR><TD CLASS="quote">im preaty sure that the reason for the extra horse power is becasue they use the same cam as the y8 head but with out the 1 intake lobe because the y8 makes the same 115hp </TD></TR></TABLE>

nope, it makes 127 hp

Ghetto Civic HX

Here's the link. It's from MSN's auto section. If you go down to engice specifications, it lists all the differences.

http://autos.msn.com/research/...c=src

Bense

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ghetto Civic HX &raquo;</TD></TR><TR><TD CLASS="quote"> Here's the link. It's from MSN's auto section. If you go down to engice specifications, it lists all the differences.

http://autos.msn.com/research/...c=src</TD></TR></TABLE>

there's no way that the y5 has a larger stroke

robtheslob

my bad it does have 127hp but i found the intake plume is smaller on the y5 so that might make the difference

Bense

bump

Kista20

It just does.

Here are some differences and comments that I know between the hx d16y5 and the others...

HX has vtec-e - (vtec-"e" for economy)
HX has 115 HP yO!
HX has vtec open up at like 2600 - 2700 rpms - (gets a head start quicker)
HX has .2 less compression - (less is better for boost)
HX has roller rockers - (good for higher revs)
HX has a different cam
HX has egr - (exhaust gas recirculation, basically emmissions crap)
HX has 5 wire o2 sensor - (wide band for running in "lean" mode for gas mileage)
HX has the cat and exhaust manfold together as one unit - (so the car warms up quicker)
HX has 37/43 mpg - (manual tranny rating)

Targa250R

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kista20 &raquo;</TD></TR><TR><TD CLASS="quote">It just does.

Here are some differences and comments that I know between the hx d16y5 and the others...

HX has vtec-e - (vtec-"e" for economy)
HX has 115 HP yO!
HX has vtec open up at like 2600 - 2700 rpms - (gets a head start quicker)
HX has .2 less compression - (less is better for boost)
HX has roller rockers - (good for higher revs)
HX has a different cam
HX has egr - (exhaust gas recirculation, basically emmissions crap)
HX has 5 wire o2 sensor - (wide band for running in "lean" mode for gas mileage)
HX has the cat and exhaust manfold together as one unit - (so the car warms up quicker)
HX has 37/43 mpg - (manual tranny rating)</TD></TR></TABLE>
Your comments make you look like a total idiot.

To the original poster, the HX has a more aggressive camshaft profile than the Y7 and Y8, and less parasitic loss due to the roller-tip cam followers. This has been discussed before; search for more information. Here's one topic to get you started:

https://honda-tech.com/zerothread?id=101349

Kista20

I was trying to be a smartass when I said "it just does" and also I said from "what I know" and yes I could've searched through the endless amount of useful information, instead I just stated the basics but I knew that other people knew more and would chime in with their info. I just said all that crap because the op doesn't seem to know much about an hx or vtec-e. I was trying to help out if you can't handle that then thats your problem.

Targa250R

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kista20 &raquo;</TD></TR><TR><TD CLASS="quote">I was trying to be a smartass when I said "it just does" and also I said from "what I know" and yes I could've searched through the endless amount of useful information, instead I just stated the basics but I knew that other people knew more and would chime in with their info. I just said all that crap because the op doesn't seem to know much about an hx or vtec-e. I was trying to help out if you can't handle that then thats your problem.</TD></TR></TABLE>
How were you "trying to help out" when you admittedly posted smartass garbage to up your post count since you "knew that other people knew more and would chime in with their info"? Next time you don't have anything useful to add to the discussion, don't post. Don't get defensive when you know you're in the wrong.

BTW, referring to the low-RPM engagement point of VTEC-E as "getting a head start quicker" is just retarded and misleading. Referring to lower compression as being "better for boost" is misleading without including relevent information.

Kista20

taken from Spade's "Let's Hear it for the HX and **** of the EX's!!! (Cam topic)" you posted

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlackDeuceCoupe &raquo;</TD></TR><TR><TD CLASS="quote">
As far as the tranny goes, sure, the HX's final drive is higher, but the gear ratios themselves are closer together. That means an EX [effectively] has a wide-ratio gearbox compared to the HX's close-ratio gearbox. What does this mean in REAL life??? The HX will gain almost a half car-length over an EX on every shift 'cause it doesn't run out of revs as fast.
</TD></TR></TABLE>

ok if a civic hx and an ex were to race the hx would have an advantage because vtec-e kicks in at 2700 instead of 5500 rpms that an ex has, thats a 2800 rpm difference so it will start to pull on the ex, now granted the ex has more power overall and it will beat the hx in the long run. My argument for less compression is better for boost doesn't necessarily mean that you can't do it with higher compression you just have to build it and get it tuned right. Lower compression lowers the chance of detonation which is very bad for an engine, for boosting a stock engine having lower compression is better and easier to deal with without worrying so much about detonation. BTW that is a great thread you posted up because there is a lot of potential for the d16y5 engine but there is not much support out there for it.

Also I'm not trying to up my post count, I've been a member for 785 days and I only have .57 avg, your right I should've posted actual facts instead of just giving out the basics.

Bense

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kista20 &raquo;</TD></TR><TR><TD CLASS="quote">taken from Spade's "Let's Hear it for the HX and **** of the EX's!!! (Cam topic)" you posted

ok if a civic hx and an ex were to race the hx would have an advantage because vtec-e kicks in at 2700 instead of 5500 rpms that an ex has, thats a 2800 rpm difference so it will start to pull on the ex, now granted the ex has more power overall and it will beat the hx in the long run. My argument for less compression is better for boost doesn't necessarily mean that you can't do it with higher compression you just have to build it and get it tuned right. Lower compression lowers the chance of detonation which is very bad for an engine, for boosting a stock engine having lower compression is better and easier to deal with without worrying so much about detonation. BTW that is a great thread you posted up because there is a lot of potential for the d16y5 engine but there is not much support out there for it.

Also I'm not trying to up my post count, I've been a member for 785 days and I only have .57 avg, your right I should've posted actual facts instead of just giving out the basics. </TD></TR></TABLE>

it doesn't have the same type of vtec as the d16y8, once the VTEC-E motor exceeds 2700ish RPMs, it switches to 2 intake valve mode

Bense

now the question is, how do i put this in my eg and get the vtec-e to work....

Kista20

ok I should've been a little more clear, I know there's two different kinds of vtec... vtec-e kicks in at 2700 rpm and the ex which has vtec and that kicks in at 5500 rpm. In my first sentence I was comparing the rpm that when vtec-e kicks in on an hx vs the vtec that an ex has. They are both vtec but they are both different types. You can convert to obd1 and use uberdata that is unless you want to convert to obd2 and use the p2n ecu.

https://honda-tech.com/zerothread?id=1302696
https://honda-tech.com/zerothread?id=1166376

zanklc

if you find this thread and want info on the d series specs heres a site to all hp ratings and torque comp and so on http://en.wikipedia.org/wiki/Honda_D_engine

24TEN

iTrader: (2)

^8 Years ago. Don't bump up old threads. And for the record Wikipedia isn't exactly the best source to rely on.