I have d16a9 engine on my rex and obx fuelrail and accel plug wires witch are for crx wont fit!!! Whats teh differece between my engine and others?

 

its a dohc 1.6 non vtec. basically a zc.

 

What country are you from? That is one of those edm engines that came without catalitic converters. Coz I looked in my engine database and this is what i found:

D16A9
1.6 16VDOHC PGM-FI
1595
137hp@6800rpm 108tq@5700rpm
88-91 CRX/Integra LS - W/O cat converter

I'm not sure about it coming in CRXs tho, but thats the info I got.

 

yeah, this engine is much like a zc. not exactly, but very similar to one. zc plug wires will work, and a zc fuel MIGHT work.

 

So wuold it be easy to just buy vtec engine head and swap it to my a9? What else wuold i have to change?

 

Its a ZC. Simply labeled d16a8/9 for the European market, specifically Rovers. They leased or licensed the motor from honda, as well as MANY other honda motors. And infact they keep the DXX in their stamping on the blocks. Certain A8's and A9s were given ECUs with this huge ungodly unit attatched to it[of course I have no pics atm] but it was for smog purpose. Some motors came catalytically converted and others didn't. Everything on that motor IS identical to the its ZC brother, just a diff block stamp and possibly different valve cover. The Rover covers simply say 16V DOHC or something, check ebay. - Darrell

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DOHCZCCRXSi &raquo;</TD></TR><TR><TD CLASS="quote">Everything on that motor IS identical to the its ZC brother, just a diff block stamp and possibly different valve cover. </TD></TR></TABLE>

So i dont have to change pistons, rods, crackshaft etc if i swap zc head on my old block? Where can i easily find zc heads?

 

The ZC was a prototype for D16A9- engine. It was used in EDM Civics and CRX's on 88-91.

JDM motors were ZC2 (1.6 Dohc ZC)
137hp (can be JIS)

European motors were D16A9 (1.6 Dohc)
130hp PM7

And what comes to rovers. D16A9 was motor on hondas. And D16A8 was at rovers. A9 came with catalytic convertor, and without. And the low emission engine is called D16Z5 (1.6 Dohc, cat, 124hp)

 

Is there any difference between zc and z6 heads? witch ECU does d16z6 use?

 

You mean the Z5, not Z6 witch is way diffrent motor?

Z5 has same head. But exhaust camshaft isint so raw as A9's cam. And its controlled by a PM7 ecu, but with low emission settings. And the car is equipped with O2 sensor.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hegster &raquo;</TD></TR><TR><TD CLASS="quote">Is there any difference between zc and z6 heads? witch ECU does d16z6 use?</TD></TR></TABLE>

Yes, very many. The Z6 is a SOHC head, it will NOT mate to ANY DOHC blocks. I believe the ECU was the P28

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Twilight &raquo;</TD></TR><TR><TD CLASS="quote">The ZC was a prototype for D16A9- engine. It was used in EDM Civics and CRX's on 88-91.

JDM motors were ZC2 (1.6 Dohc ZC)
137hp (can be JIS)

European motors were D16A9 (1.6 Dohc)
130hp PM7

And what comes to rovers. D16A9 was motor on hondas. And D16A8 was at rovers. A9 came with catalytic convertor, and without. And the low emission engine is called D16Z5 (1.6 Dohc, cat, 124hp)</TD></TR></TABLE>

according to Honda ( http://www.honda.co.uk/owner/C...2.pdf )
D16A8 9.5:1 (catalytic converter)
D16A9 9.1:1 (no catalytic converter)
came in European Civic, CRX, and Concerto? from around 88-91, and Rover 216/416 GTI from around 89-96-ish

Rover and Honda both used both the A8 and A9. the A8 has higher compression ratio to compensate for having a cat.

 

ZC is not a true dohc. it still has a sohc bottom. why else would you be able to put a sohc trans on it. hense it is still a D-series motor. I may be wrong. but i could not see why you couldn't convert it to a sohc head. from a D-series.

(edit)
to change the head i think you would need the sohc pistons, head, timing belt, intake manifold. it would probably be cheaper just to find another dohc zc head.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bad89rex &raquo;</TD></TR><TR><TD CLASS="quote">ZC is not a true dohc. it still has a sohc bottom. why else would you be able to put a sohc trans on it. hense it is still a D-series motor. I may be wrong. but i could not see why you couldn't convert it to a sohc head. from a D-series. </TD></TR></TABLE>

Que?!?!?!??!?!?!?!??!?!?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bad89rex &raquo;</TD></TR><TR><TD CLASS="quote">ZC is not a true dohc. it still has a sohc bottom. why else would you be able to put a sohc trans on it. hense it is still a D-series motor. I may be wrong. but i could not see why you couldn't convert it to a sohc head. from a D-series.
</TD></TR></TABLE>

Say what?

 

seriously can you bolt a sohc tranny to a ZC motor? yes...
can anything on the bottom of a sohc motor fit a ZC bottom? yes... so why wouldn't the head fit. seriously I have never heard of anyone trying it. too me it seems possible. go ahead and flame me. but no1 has done/tried it. so you can't really say it couldn't work unless there is documentation showing someone trying it, and it didn't work.

 

I know someone on this board attempted to put a dohc zc head on a sohc d series block. It took alot of welding and a lot of fabrication.

I still dont get what you mean by a sohc transmission? If you are saying that the bolt pattern on the dohc zc is the same as a sohc zc then you are correct, but as far as them being the same block I think you are way off.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bad89rex &raquo;</TD></TR><TR><TD CLASS="quote">seriously can you bolt a sohc tranny to a ZC motor? yes...
can anything on the bottom of a sohc motor fit a ZC bottom? yes... so why wouldn't the head fit. seriously I have never heard of anyone trying it. too me it seems possible. go ahead and flame me. but no1 has done/tried it. so you can't really say it couldn't work unless there is documentation showing someone trying it, and it didn't work.</TD></TR></TABLE>

yes it's been tried. but most times the other way. dohc on a sohc bottom end. No there is no reason to do either of these swaps because the pistons/rods swap back and forth between the zc bottom end and other sohc 1.6 bottom ends. There is nothing to gain.

btw it is possible but as i said before NOT worth it at all.

 

that's what i said too... i just say it is possible. but might as well get another ZC head, or just opt for a B series motor.

I just wish people read throughly.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by I4sillypwr &raquo;</TD></TR><TR><TD CLASS="quote">No there is no reason to do either of these swaps because the pistons/rods swap back and forth between the zc bottom end and other sohc 1.6 bottom ends. There is nothing to gain.</TD></TR></TABLE>

The JDM BlackTop DOHCZC pistons are domed and net the motor a 9.6CR, the pistons are different from a SOHCZC's pistons. They're more similar to the D16a1 infact, they're almost identical, but don't share the same part #s. That is why many of the SOHCZC guys are building their ZCs with DOHCZC pistons and single layer HG's to try to raise that CR to 12.+

 

I'm am well aware of the differance in piston specs. I've built a couple high compression D's using oem pistons. I was refering to the fact that you can swap them back and forth to get what ever compression ratio you want.

 

[QUOTE=gutterslide]
D16A8 9.5:1 (catalytic converter)
D16A9 9.1:1 (no catalytic converter)[\QUOTE]

Sorry for the misinformation, but the A9 has 9.5:1 compression. if youre reading a service manual from 87, the information isint correct.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Twilight &raquo;</TD></TR><TR><TD CLASS="quote">the A9 has 9.5:1 compression.</TD></TR></TABLE>

you're probably right. Honda has conflicting info. in the 88-91 CRX manual (includes D16A8/A9), it shows that all engines with cats are 9.5:1 and without cats are 9.1:1.
http://www.honda.co.uk/owner/C...8.pdf

however, in this document for the 90-94 Concerto, it says all DOHC engines (also includes D16A8/A9) are 9.5:1.
http://www.honda.co.uk/owner/C...4.pdf

 

hey can someone help me out.....will d16a9 rods work in a z6 block with z6 pistons?

also will will the pistons transfer over if I wanted to d a high comp motor too? thanx
Casey