Hey guys, I think my motor may be on its last legs and I was looking at swapping it.

I was curious about a couple of things:

-Is $450 a good price to pay from a reputable JDM engine dealer?
-Will I be able to use D16A6 maintenance parts for it?
-How easy/difficult is the swap if I'm still DPFI?
-Do I use the same distributor, injectors, I/M etc.?
-What transmission is better, the USDM SI or the SOHC ZC?

Sorry for the questions guys but our search doesn't allow ZC


Modified by thenick at 6:31 PM 3/26/2006

 

i have a 91 si with that motor, its the same thing as the stock si only jap. out of the teg. direct si swap, same parts as d16a6 etc... its got a better cam and a better bottom end tho from what i understand, sucker pulls hard all the way to 7200, i like it.

 

I had a stock Si motor in my 90 CRX HF but then I put in the SOHC ZC and it made a big difference. Im running the Si Computer and I love it. I can keep up with my friends 91 Si CRX and he has a B16a. You can put the DPFI Intake manifold on the SOHC ZC all you have to do is either machine or buy a block off plate for the back of the head where there is an oil out. But I would highly suggest just getting ahold of a Multi Point Fuel Injection Manifold Because It makes a huge difference. You just have to have it wired up and it should work just fine. Good Luck...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SIred91 &raquo;</TD></TR><TR><TD CLASS="quote">i have a 91 si with that motor, its the same thing as the stock si only jap. out of the teg. direct si swap, same parts as d16a6 etc... its got a better cam and a better bottom end tho from what i understand, sucker pulls hard all the way to 7200, i like it.</TD></TR></TABLE> This motor only came in the 92 Integra AWD thing. The bottom end IS THE SAME and the cam is only marginally different, i.e. a couple degrees duration on the exhaust.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 90JDMEF8 &raquo;</TD></TR><TR><TD CLASS="quote">I had a stock Si motor in my 90 CRX HF but then I put in the SOHC ZC and it made a big difference. Im running the Si Computer and I love it. I can keep up with my friends 91 Si CRX and he has a B16a. You can put the DPFI Intake manifold on the SOHC ZC all you have to do is either machine or buy a block off plate for the back of the head where there is an oil out. But I would highly suggest just getting ahold of a Multi Point Fuel Injection Manifold Because It makes a huge difference. You just have to have it wired up and it should work just fine. Good Luck... </TD></TR></TABLE>What the hell are you talking about "oil" out of the head? Are you thinking the D15B and the VTEC Solinoid?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 90JDMEF8 &raquo;</TD></TR><TR><TD CLASS="quote">I had a stock Si motor in my 90 CRX HF but then I put in the SOHC ZC and it made a big difference. Im running the Si Computer and I love it. I can keep up with my friends 91 Si CRX and he has a B16a. You can put the DPFI Intake manifold on the SOHC ZC all you have to do is either machine or buy a block off plate for the back of the head where there is an oil out. But I would highly suggest just getting ahold of a Multi Point Fuel Injection Manifold Because It makes a huge difference. You just have to have it wired up and it should work just fine. Good Luck... </TD></TR></TABLE>

You lost me dude. I'm not trying to keep the DPFI -- I'm just wondering if the swap is the same as an SI one? (i.e. Can I use all the parts from the ZC or do I have to replace any of them with SI parts?)

 

the only thing you need to do is have your harnesst conveted to multiepoint, use the si dis. and computer. stick with the si trans its fine. oh yeah youll need a resister box too

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by enforcer &raquo;</TD></TR><TR><TD CLASS="quote">the only thing you need to do is have your harnesst conveted to multiepoint, use the si dis. and computer. stick with the si trans its fine. oh yeah youll need a resister box too</TD></TR></TABLE>

I know I have to convert the harness to MPFI. So I can't use the SOHC ZC distributor, ECU, or transmission?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 90JDMEF8 &raquo;</TD></TR><TR><TD CLASS="quote">. You can put the DPFI Intake manifold on the SOHC ZC all you have to do is either machine or buy a block off plate for the back of the head where there is an oil out.</TD></TR></TABLE>

Hes talking about the dual carb SOHC ZCs that had a mechanical fuel pump. If you get a fuel injected version, you dont have to worry about a hole to plug up. Plus they have a better cam than the dual carb ones.

$450 is kind of a lot. All the places near me want $395 at the most. Hmotors has them for $390 and thats with all the sensors intact, dizzy, ect.

 

ok yes you can use the ecu.thetrans and the distributor im not sure. i can find out for you or hit up chris at hookups or jason at rage and they will lead you in the right direction. let me know.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by enforcer &raquo;</TD></TR><TR><TD CLASS="quote">ok yes you can use the ecu.thetrans and the distributor im not sure. i can find out for you or hit up chris at hookups or jason at rage and they will lead you in the right direction. let me know.</TD></TR></TABLE>

You can use the SOHC ZC as a regular replacement long block which means everything will swap over (DPFI manifold, dizzy, ect). The only exception is if you have power steering in which case you need a power steering bracket from a 1.6 block. Other than that everything bolts up.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by silentdork818 &raquo;</TD></TR><TR><TD CLASS="quote">You can use the SOHC ZC as a regular replacement long block which means everything will swap over (DPFI manifold, dizzy, ect). The only exception is if you have power steering in which case you need a power steering bracket from a 1.6 block. Other than that everything bolts up.</TD></TR></TABLE>

<FONT SIZE="5">NO DPFI!!!!</FONT>

I just want to know if I can swap over the SOHC ZC without having to use any SI donor parts.

 

Lets make this clear! The sohc jdm ZC (fuel injected model) is exactly the same engine as the north american D16A6......the "only" difference is the a slightly different grind on the cam. Power is rated at 118hp.

All parts are interchagable between the 2 engines.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Deetz &raquo;</TD></TR><TR><TD CLASS="quote">Lets make this clear! The sohc jdm ZC (fuel injected model) is exactly the same engine as the north american D16A6......the "only" difference is the a slightly different grind on the cam. Power is rated at 118hp.

All parts are interchagable between the 2 engines.</TD></TR></TABLE>

Thank you!

So all that's needed to swap it into my DX is to convert the harness to MPFI and run a resistor box correct?

Also how is the gearing of a SOHC ZC tranny compared to the D16A6 tranny?

 

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

Thank you!

So all that's needed to swap it into my DX is to convert the harness to MPFI and run a resistor box correct?

Also how is the gearing of a SOHC ZC tranny compared to the D16A6 tranny?</TD></TR></TABLE>

Your welcome

Yes, just a resistor needs to be added, and the engine needs an Si ecu to run.

The zc tranny is geared lower, and rev's higher on the hiway. It also uses and intermediate shaft, so you have to buy new axels also. I'm not a big fan of this tranny.

 

So I can't use the SOHC ZC ECU?

And as far as the tranny goes, I was under the impression it was a better, quicker transmission. I'd like to use it but do you know what axles I would have to use?

 

stick w the si tranny, eisier to get parts, just as peppy.

 

Any word on if the SOHC ZC ECU can be used or do I have to source a PM6?

 

im runnin a sohc zc...i love it, a lot of fun for what i paid for it...pulls great

 

somebody in the posts above mentioned revving the sohc zc to 7200, can that be done without harming the engine?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civhatch90 &raquo;</TD></TR><TR><TD CLASS="quote">somebody in the posts above mentioned revving the sohc zc to 7200, can that be done without harming the engine?</TD></TR></TABLE>

do it...then let me know

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civhatch90 &raquo;</TD></TR><TR><TD CLASS="quote">somebody in the posts above mentioned revving the sohc zc to 7200, can that be done without harming the engine?</TD></TR></TABLE>

i rev mine to 7100 without any problems. but i have the PG7 ecu. ive gone to 7500 a few times. but u know our tachs r not exact so im sure it was off

 

<FONT SIZE="5">http://www.hmotorsonline.com/s...30018</FONT>

That's the SOHC ZC you need!!! Awesome customer service and quality. I literally have the same engine being shipped to me right now!

Then, just do what these pages say: (Also, get a Haynes or Chilton's manual for your car. It will help w/ rmoval of stuff.)

http://www.zcspeed.com/zcspeed.htm
http://thenew.gamesbbs.com/~dm...0List

 

Aren't these pages showing how to swap a DOHC ZC in?

Tippyman how much did you pay for shipping? I 'm still deciding what motor I want to go with and who I want to order from. Ideally I would like a D16A6 but if the SOHC ZC is as identical as everyone else is saying it is then I might go that route.

Here is the one I've been thinking about: http://cgi.ebay.com/88-95-HOND...wItem

 

The SOHC ZC is a D16A6 with better cams.

I live in VA and paid $250 in shipping.

If you are closer it would obviously be less. Or, if you live close enough, pick it up yourself!

The wiring is the same regardless of whether it is DOHC or SOHC.

 

Everything about the swap is the same regardless of whether it is a DOHC or SOHC. The only difference is that you need a PM6 ecu (From a 88-91 Civic/CRX Si) because the SOHC ZC is essentially the motor from an 88-91 Civic/CRX Si. Don't get a PG7 like the swap guides say, that is for a DOHC. Get a PM6.

Once I get my engine (should be by this weekend or by Monday.) I'll post a comment in my project thread (https://honda-tech.com/zerothread?id=1572180) that will say whether or not the exhaust bolts up. That's my only source of concern regarding the swap i have on the way. I don't know about the exhaust fitment, but, as i said, i will let you know...

Anyway, check my project thread, i got pics of everything i've done to prepare for the swap so far...