ok my friend wants me to put in a shoc zc in his crx hf because his motor blew. he wants to do something cheap but a little more power then the hf. i have a few ? before i tell him to buy the motor.

like does he need to buy motor mounts or will the old d15 one work. there in good shape.

does the hf tranny fit on the zc motor.

does anything need done to the wiring harness.

and will the d15 axles work with that motor.

and does he need to buy anything else for that motor swap. i know he is gett the zc ecu to.

i've done a swap before(h22 crx). so i'm not worried. about this one. i'm sure this will be a breeze compared to that.

but i dont know that much about the zc. i've heard that the zc are just like d16a6 but there jdm. dont know how true that is. but please help

 

The tranny will fit depinding on year. 88,89 are diffrent from 90,91. I belive it's the teeth count on the flywheel or somthing like that. Personaly I would get the tranny that comes with the ZC.
The wiring harness needs to be moded becasue the ZC has Vtec. I don't know what exactly needs to be done because electronics kind of scare me so I sent mine in to HAsport.
I'm not %100 sure with the sohc ZC if you could use the same axles but if you use the hf tranny then you can.
Other then that you should be set. I would invest in new motor mounts, timming belt, altenater, you know stuff like that.

That's all I can help you with as far as the SOHC ZC swap. I'm sure if I'm wrong about something someone will call me out on it. Hope this bit of info helps.

 

well mounts will fit

tranny will fit (will be kinda restricting tho cuz its not made for speed)

im not sure if the hf had mpfi if it did then nothing but the plugs i think cuz the zc has square ones as oposed to circular ones or vise versa

if it didnt u have to wire the mpfi

if u wanna use the zc tranny you need new axles otherwise its fine

and i think im not sure something about the header doesnt bolt up

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ci_vic &raquo;</TD></TR><TR><TD CLASS="quote">
The wiring harness needs to be moded becasue the ZC has Vtec.

That's all I can help you with as far as the SOHC ZC swap. I'm sure if I'm wrong about something someone will call me out on it. Hope this bit of info helps.</TD></TR></TABLE>

i dont know what kinda of zc you have but the sohc zc didnt really come in VTEC and i see you have a dohc and thoes deff didnt come in vtec

so besides that your mostly right

 

The engine mounts will just bolt right up.

You can use the stock HF transaxle if you want to, but a DX or Si transaxle would be much better for the swap because the shorter gearing allows you to make more effective use of the ZC's power. Using the HF flywheel on the ZC engine would probably be the best way to ensure that you have the correctly splined flywheel for the input shaft of your transaxle. If you do not have an 88 model year car or engine, disregard this as 89 - 91 model years have the same flywheel.

Definitely use the ZC ECU if you can. If not, use a CRX (or Civic) Si ECU or an 88 - 89 Acura Integra ECU (the type with the black valve cover only).

The stock HF wiring harness will work just fine, but you will have one extra plug on the harness that will not plug in to the SOHC ZC. It is for the EGR valve, which is an HF only part. Just leave it unplugged. The computer will not throw a code because only HF computers have the circuitry to control the EGR system.

The stock HF axles should work on any other Civic/CRX transaxle for a D series engine except for the DOHC ZC transaxle, which has different splines. HF axles have different splines at the hub end and will not work in a DX or Si model car, but this should not be a consideration unless you are planning on changing out the hubs.

The only other thing I can think of is that the HF airbox and intake tube are smaller than one for a DX, Si, or ZC engine. The intake tube is of a smaller diameter. Just get a DX or Si airbox lid and intake tube from the junkyard and you will be all set. Sedan ones don't seem to fit right, so get the setup from a CRX.

The SOHC ZC is very similar to the D16A6. I have read that it might have a slightly hotter camshaft than the US spec. engine, but everything else is largely the same. You can use D16A6 parts on the SOHC ZC, as all interchange.

If you are dropping in a used engine, I would recommend that a new timing belt and water pump be fitted (easier when the engine is on a stand). Also, adjust the valve lash and timing when it is in. Use a new valve cover gasket and oil pan gasket if you want, but tearing down the engine to replace all of the gaskets is usually a waste of time and voids most warranties. Replace the PCV valve, as a clogged one is a major source of leaks from the distributor O-ring. You might also consider getting a DX or Si exhaust manifold and modifying the exhaust system to use this style, as the HF manifold with close - coupled catalytic converter is not the greatest for performance use.

 

i just read what the previous person wrote and i am repeating him a lot.

well im doing an sohc zc myself right now

i did not read any elses post other then the 1st and second so sorry if im repeating.

sohc is NOT v-tec... dont know where you are getting that from (unlees you are using a different one then i am thiking)

the hf tranny will be fine. if you get the zc tranny you will need different axles (dont know off the top of my head what ones)

the pm-6 ecu 88-91 will work fine, no need to waste the more money for the ecu, 90-91 of course preffered because easier chipped.

where can you get a zc ecu though? i would like one myself, even though i am using a pm6 with it now.

since the hf is already mpfi the wire harness will be no problem.

the zc is just the jdm version of the d16a6 it just has a higher compression rate.

here is a link to where i was discussing the sohc zc:
https://honda-tech.com/zerothread?id=1810068

may have to go through a little to get to where we started talking about the zc

since you replaced a motor already im sure you know its good to replace the timing belt, therostat and water pump while you are in there, and clutch if you are going to have the motor apart from the tranny.

 

just to clear things up, the SOHC ZC <U>was</U> available with VTEC as well as without VTEC - the VTEC version is the same as USDM D16Z6

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlicrx &raquo;</TD></TR><TR><TD CLASS="quote">just to clear things up, the SOHC ZC <U>was</U> available with VTEC as well as without VTEC - the VTEC version is the same as USDM D16Z6</TD></TR></TABLE>

Thank you for that.

Please everyone else.... do not speak out of place. ZC SOHC was available with vtec.


Continue

 

so pretty much its a Straight. right and if its a 89-91 crx. i know about the spline thing. had a b15b2 1988 myself at one time. he wants to get it from h motors. i got a pm6 ecu for it. and the one his getting is no-vtec. the motor will wont though a engine code with-out the egr valve right(because of the pm6 ecu).
he has a short ram intake that will work on it so i'm good with that.
ok sounds freaking easy as hell.

 

also there are two separate wires that will go from the hf distributor plug to the external cam positioning sensor on the ZC! Other than that direct bolt in!

 

what? so what do i need to do then

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mr_hahn73 &raquo;</TD></TR><TR><TD CLASS="quote">also there are two separate wires that will go from the hf distributor plug to the external cam positioning sensor on the ZC! Other than that direct bolt in!</TD></TR></TABLE>that is for a DOHC ZC - he has a SOHC ZC

 

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

i dont know what kinda of zc you have but the sohc zc didnt really come in VTEC and i see you have a dohc and thoes deff didnt come in vtec

so besides that your mostly right
</TD></TR></TABLE>

I didn't say mine came with vtec I was just refuring to the sohc ZC comming with vtec. I know the DOHC ZC dosen't have vtec. Some SOHC ZC's did come with vtec (as stated by some one else).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mr_hahn73 &raquo;</TD></TR><TR><TD CLASS="quote">also there are two separate wires that will go from the hf distributor plug to the external cam positioning sensor on the ZC! Other than that direct bolt in!</TD></TR></TABLE>you are mistaking it for the dohc zc...

the motor will bolt right in and run fine with an SI(PM6) ecu. there is a plug that goes to your stock HF EGR valve that you will just let hang

 

dam i just found out it is a 1987 hf does anyone what you have to do that

 

why dont you search for once

 

whyd dont you drow dick and race me you *****. and i didn't see anything when i did a sreach. dont talk to me mike tell you race me.



Modified by CRX DX 2 LS BobbyG at 7:51 PM 12/11/2006

 

well that was an extremely irrational and bad gramered response...

you are not going to find much on putting an sohc zc into an 87... at least not on this thread...

i may be incorrect but the sohc zc was the equivalent of the d16a6, that is the usdm 88-91 si, unless you are speaking of a different sohc zc, and if you you need to specify, there are multiple zc's


Modified by stemiched at 11:12 PM 12/11/2006

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stemiched &raquo;</TD></TR><TR><TD CLASS="quote"> you need to specify, there are multiple zc's </TD></TR></TABLE>

then maby people will know how to help you

 

hey maybe if you read the hole thing you would know fagget. so shut the expletive up mike untell you race me bitch.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRX DX 2 LS BobbyG &raquo;</TD></TR><TR><TD CLASS="quote">hey maybe if you read the hole thing you would know fagget. so shut the expletive up mike untell you race me bitch. </TD></TR></TABLE>

you need to specify exactly who you are talking to, i have read every post since the 1st one, all you have said is sohc zc, there are multiple sohc zc's.
don't know who you are talking to but if you are talking to me i just want to say that calling people **** is just a really old insult... not many people are even insulted by that anymore... and wtf is up with you wanting to race people? who ever said they wanted to race you?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRX DX 2 LS BobbyG &raquo;</TD></TR><TR><TD CLASS="quote">hey maybe if you read the hole thing you would know fagget. so shut the expletive up mike untell you race me bitch. </TD></TR></TABLE>watch out for the badass e-thug...