cbmprelude

I was wondering what all is involved in swapping the head from a ek hx motor to my cx motor? I want the bump in mpgs and the slightly higher hp would be nice too. I noticed that the bore and stroke and cp ratio are the same as well which might suggest to me that they have the same blocks. I belive the hx is the d16y5 to my current d16y7.

Kista20

If your car is a manual the swap will be a lot easier, the hx cvt auto tranny is a real pos. You would need the head, dizzy, im (hx's have egr ports), tb, wiring harness, ecu, exhaust manifold w/cat and o2 sensors. The block is the same except that the hx's and ex's have the oil squirters in the block. Also I'd get an hx tranny to go along with it if your looking for even more mileage increases. I'd love to see what kindof mileage you could get with this combination.

cbmprelude

Me to. I thought the cx and hx had same tranny? Also will the oil squirters have that much of an impact? And where is best to locate these parts?

Kista20

the oil squirters are just there to squirt a little oil on the skirts of the pistons to help lubricate them is all and the d16y7 doesn't have them because it doesn't mad vtec. Some people have mixed feelings about the squirters and for a dd you wouldn't notice any difference. I thought the hx had different gear ratios but I could be wrong, there isn't much info out there on the hx's. Also as for looking for parts the hx stuff is a little harder to find, you might try ebay sometimes they have y5 stuff.

specv5150

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cbmprelude &raquo;</TD></TR><TR><TD CLASS="quote">Me to. I thought the cx and hx had same tranny? Also will the oil squirters have that much of an impact? And where is best to locate these parts?</TD></TR></TABLE>

Ihave an ECU. 5spd

cbmprelude

thats cool you have that stuff but I probably wont be doing this swap for a few weeks. Will changing the trans to en ex or any toehr type hurt my gas mileage? Also what affect will there be on gas mileage say if I swapped to the y8 head compared to keeping the y7 or swapping to the y5?

dantastic

wow. all that work for 9hp and 3(city) 6(hwy) better MPG? do you think it's really worth it?

(the differences are taken from the EPA estimates for DX and HX coupes)

specv5150

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dantastic &raquo;</TD></TR><TR><TD CLASS="quote">wow. all that work for 9hp and 3(city) 6(hwy) better MPG? do you think it's really worth it?

(the differences are taken from the EPA estimates for DX and HX coupes)</TD></TR></TABLE>

Yeah the money and time involved is not worth so little extra mpg.

Kista20

over time it would add up, say if you do get 5 mpg more per tank you would probabaly get 50+ extra miles out of one tank, over a year that can add up. If you filled up twice a month that would be 1200 more miles in a year on the same amt of gas. Lets just say now your getting 350 miles per tank and here gas is $3.099 and when I usually fill up it's 10.5 gallons, so that equals out too $32.54 or roughly 9.3 cents a mile of what it costs if you wanna figure it up that way. With the extra 5 more mpg and getting 400 miles per tank and that comes out to be around 8.14 cents per mile. So with 350 miles per tank and twice a month fill-up totals out to $781.20 a year for gas but with the 5 extra mpg you would've spent $683.76 saving $97.44 and divide that out and it's $8.12 per month. Me I'd rather have an extra $8 every month and use it on something useful rather than just be throwing it away.

Mine is rated for 37/43 mpg in a heavy *** coupe, put that combo in a hatch and you'd at least get 40-45 mpg easily if not a little more. I love my gas mileage and being able to go 400+ miles on a tank. I've already put 125 miles on this tankful and I've only used 1/8th of a tank so far and it'll be awhile till I have to fill up again.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by specv5150 &raquo;</TD></TR><TR><TD CLASS="quote">

Yeah the money and time involved is not worth so little extra mpg.</TD></TR></TABLE>

I do have to agree with you there but the extra mileage is nice

cbmprelude

Well Im just looking through my options. I want my power and more fuel economy. I think the slight increase in power will be noticable. And the mpg increase in a stripped hatch would be nice. Gas is over 350 a gallon a lot of places here and shows no sign of stopping. Plus I have to change my timing belt and other major maintance at the same time so why not.
I also would love to get more experience working on motors, and there is a little bit of pride I would get as well when I pop my hood and I'm like bam I did that. Also I was hoping that the new head with a cai could add my 15 horsepower total and I wouldn't mind having that vtec sound

cbmprelude

bump

Kista20

if you want vtec sound after you do whichever swap get an air intake, you'll be able to hear it better, you can hear it but it's nothing like a b+ series. Mine you can feel it when it hits vtec. It feels like a gust of wind gets behind you and give you a push, with the b+ series it's more like the jolly green giant kicks it in the ***

I was exaggerating btw but you get the point.

Buzzbomb

There will be no "vtec sound" because the VTEC-E just goes from 3 valve operation, to 4 valve operation. There are no large intake lobes it goes to.

cbmprelude

will there me any loss of mpg with moving to the d16y8 head? Is there any b-series I can use and still get good mpgs?

specv5150

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Buzzbomb &raquo;</TD></TR><TR><TD CLASS="quote">There will be no "vtec sound" because the VTEC-E just goes from 3 valve operation, to 4 valve operation. There are no large intake lobes it goes to.</TD></TR></TABLE>

I could not tell when my HX switched to vtec with stock ecu, CAI and Header. Now with my P28, I can hear it and feel it

Buzzbomb

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by specv5150 &raquo;</TD></TR><TR><TD CLASS="quote">I could not tell when my HX switched to vtec with stock ecu, CAI and Header. Now with my P28, I can hear it and feel it</TD></TR></TABLE>

I'm sure it's not the same sound as a b16 with an intake. This is was I was thinking when he mentioned the "vtec sound"

I can imagine the sound is going to change some.

suspendedHatch

HX motor in a EG will get better mileage than it did in the EK. The peak hp numbers may not seem that impressive, but there are going to be power and torque gains across the entire RPM range. I suggest you remove the PS. EG and older Civics really have no need for PS, especially if you can get a manual rack. There are significant mileage, power, and revving benefits from removing PS. You'll probably get more of a mileage from that than from the swap.

If you do a lot of freeway miles on a EG hatch, get the VX rear diffuser.

I plan to swap an HX into my 90 Si. I'm just waiting for the money and the deal to come together. I currently have a OBD0 SOHC ZC (similar to D16A6) and I'm already getting 32 mpg city miles with bad tires, bad alignment, and questionable condition of all maintainable parts since I just bought this car a few months ago.

As for which TB, which manifold etc, it's not going to make much difference to mileage. Just match the diameter of the IM to the TB, and the head ports to the IM. Maybe do some port matching. Stick to the longer, small diameter stuff for better air velocity on such a mild tune.

specv5150

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

I'm sure it's not the same sound as a b16 with an intake. This is was I was thinking when he mentioned the "vtec sound"

I can imagine the sound is going to change some.</TD></TR></TABLE>

I cant speak on that. i have never ridden in a B series car with VTEC (or without really). I know on my car you can feel the shift and the car gets extremely loud

cbmprelude

My car is a cx so it has no ps. Also what is the vx rear diffuser? Will the oil squirters make much difference and will stripping the car help?

cbmprelude

is there anything to increase my mpgs?

The Airman

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by specv5150 &raquo;</TD></TR><TR><TD CLASS="quote"> Now with my P28, I can hear it and feel it</TD></TR></TABLE>

hahahahahaah!! p28. stock ecu. hear it feel it you've got to be shiting me.

Look if the guy want to do it. it sounds like fun if he doesn't have to money for anyting better. and the mpg would just be a bonus. hell, i'd swap to the same motor with 20000 less miles if it was 50 bucks and i had a weekend free just for the **** of it nowadays. it all depends on how much action you got going on. and how bored you are.

cbmprelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kista20 &raquo;</TD></TR><TR><TD CLASS="quote">If your car is a manual the swap will be a lot easier, the hx cvt auto tranny is a real pos. You would need the head, dizzy, im (hx's have egr ports), tb, wiring harness, ecu, exhaust manifold w/cat and o2 sensors. The block is the same except that the hx's and ex's have the oil squirters in the block. Also I'd get an hx tranny to go along with it if your looking for even more mileage increases. I'd love to see what kindof mileage you could get with this combination. </TD></TR></TABLE>

Is it possible to just use the im from my y7 or that from a y8 so I do not have to deal with the egrs? I was kinda hoping I could swap the head and ecu.

cbmprelude

bump

Kista20

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

Is it possible to just use the im from my y7 or that from a y8 so I do not have to deal with the egrs? I was kinda hoping I could swap the head and ecu.</TD></TR></TABLE>

with hx's, both the manual and auto are egr and I think the ex auto has egr, ex manual does not have it. You'll want to use the ex manual one and not the y7 because basically it pretty much sucks. And you'll need a harness and dizzy for whichever head you decide to use.