ok i have a 91 si and i still have my original motor,it really needs to be swapped because adding oil every month sucks!...i cant find a leak anywhere but i have to add a quart every month and a half-is that normal? i think i have a bad head gasket...could that be it?-anyways.....i was thinking about saving for a b16 but i was wondering if someone could just help me out with some info on the zc engines.....i dont know **** about them....is there anyone who can give me some facts,prices,good things, bad things, and any if not all information on them? what car are they from or they jdm or usdm or both?? i searched for zc in the search thing but nothing will come up....are they obd1 or nothing? i need to know!!! also can i recieve some opinion on a zc or a b16? which should i get and why? thanks techs for the help...

 

oh yea what do i have to convert or change if i want to put a zc in my stock si??? do i have to change anything? its confusing me i want a dohc one too if thats any better...they are non vtec right?

 

ZC good or bad, well it depends who u ask, i love em' some people hate em'. Alot of it is pure opinion. As far as your current engine your probably burning oil through your rings. As for ZC factoids. They are JDM engines, non-vtec, they came out of 88-91 Civic / Crx si's, The DOHC has about 130 hp and a redline of about 7200-7400. Alot of this info varies from source to source, but it's all pretty close. ZC's cost between 400-700 dollars depending on where u live. I'm lucky, i live in MI, i just go to Canada, to bad the exchange rate blows right now. The wiring conversion is real easy, there is alot of info on it. I believe i answered just about everything.

 

what are some extremely good zc sites? if i got a zc could i make it to where i break off mustangs and **** like that on the daily? what do most zc engines mileage come with?

 

the dohc zc will swap right in with your si tranny. You can get a zc here http://www.hmotorsonline.com/s...30016
You can find more info if you search a little more.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91sihatchback &raquo;</TD></TR><TR><TD CLASS="quote">what are some extremely good zc sites? if i got a zc could i make it to where i break off mustangs and **** like that on the daily? what do most zc engines mileage come with?</TD></TR></TABLE>
this may help with the power http://www.motionless.net/articles/zcturbo1.html

try this one too http://www.thezcresource.com/

 

thanks that was a ton of help

 

that site thezcresource.com sucks it keeps messing with my internet and shuting it off and i have cable!!! anymore sites anyone can offer me?

 

bump..

 

a few dohc zc's are obd-1, they can be switched to obd-0 by changing the distributor and cam sensor. The obd-1 zc's are supposed to be like 5 horspower stronger plus they are out of newer cars.

 

Technical Data:

1.6L (1590 cc) DOHC non-VTEC
Horsepower - 130-137 hp @ 6800 rpm
Torque - 108ft-lbs @ 5700 rpm
Redline - 7500 rpm
Idle - 750rpm
Bore - 75.0
Stroke - 90.0
Compression Ratio - 9.5:1
Injection - Multi-Point PGM-FI
Minimum Recomended Fuel - 91 octane.


Parts Interchange:

ECU (good/better/best)- 88-91 CRX/87-89 Integra/89-91 ZC
Timing Belt - 88 Honda Prelude
Distributor Cap - 88 Honda CRX or Acura Interga
Rotor - 88 Honda CRX or Acura Integra
Head Gasket - 88 Honda Prelude
Intake Gasket - 88 Acura Integra
Exhaust Gasket - 88 Acura Integra
Oil Pan Gasket - 88-91 CRX or 86-89 Integra
Water Pump - 90 Honda CRX
Oil Filter - 87-89 Acura Integra
Clutch (w/use of Si tranny) - 89-91 Honda CRX Si
Flywheel - 89-91 Honda CRX Si
Throttle Body - 88-91 Honda CRX Si
Spark Plug Wires - 87-89 Honda Integra
Spark Plugs - NGK BCPR6E-11
Think of it as Civic Si head on a 86-89 Integra Bottom end(sorta)


Transmissions:

There are a few choices as to what tranny may be used. The 5 speed 88-91 CRX DX tranny will fit but is not recomended. The 88-91 CRX Si is a better choice and is recomended for casual and highway driving but the "quickest" transmission would be the actual ZC transmission with 90-93 Intregra axles. It is a close ratio tranny but will spin a higher rpm at highway speeds. A hybrid transmission can be created using the ZC transmission housing and 1-5 gears along with the Si final drive howver many people suggest that this is not worth the effort.

Gear Ratios:
ZC: Si:
1st: 3.250........ 3.250
2nd: 1.944........ 1.894
3rd: 1.346........ 1.259
4th: 1.033........ 0.937
5th: 0.878........ 0.771
final 3.888........ 4.250

Info:

The ZC comes with a black valve cover with the cover bolts on the sides
The Honda symbol is on the exhaust side of the valve cover
The ZC comes with a 4-2-1 header style exhaust manifold
The ZC comes with a small oil to water oil cooler on the back of the block
The ZC has the same mounting points as the standard 88-91 CRX/CIVIC
The ZC internals have dome shaped pistons and rods which are a slightly stronger than the Si.


Swap Info:

The ZC will bolt right in to the 88-91 CRX/CIVIC no fabricating or welding is needed. The swap can use your existing wiring harness if you have an SI, if you have a DX then minor modification is necessary. You can use the SI or DX transmissions and flywheel, they both bolt up. The engine only adds about 25 pounds to the front of the car, so your steering and suspension should remain the same. Your battery can be relocated to the trunk to compensate for this.


Modifications:

As far as I know, HKS is the only company that makes billet cams for the ZC, they are, 256 degrees intake and exhaust duration with 5.95mm Intake lift and 5.3 mm exhaust lift., they are ground from new billets.

GReddy makes a turbo application which will fit the ZC with some minor modifications. It is the 92-95 Civic turbo kit. This kit will require a small amount of port matching but will work fine without.

For use of a header, A 5th generation Civic header will fit but requires port matching aswell. It is not very complicated but must be done. It is advised to place the ZC (88 Acura Integra) exhaust gasket on the header and mark out what needs to be ground off. At this time, you can make the header port slightly larger than the ZC head port to prevent reverse flow.

Intake and exhausts are the same as the Si.

 

Frequently Asked ZC Questions
Q - I've hard that the serial number on the ZC engine can tell you about where it came from?
A - wil@crx.org tells us that ZCs with a serial number starting with 2 is from Civic/CR-X and with a 5 is 2nd-gen Integra

Q - What clutch do I need for my 88/89/90-91 CRX and what type of flywheel can I use?
A - Check my transmission page for that information.

Q - What is the difference between the "ZC" ECU and the 88-89 Integra ECU?
A - The ZC ECU comes from the car that originally had the D16A8/9 (ZC) - thus one would assume that it is "perfectly" matched to the engine. The 88-89 Integra ECU comes from the, you guess it, 88-89 Integra. This car came with the D16A1 engine that was a 1.6l DOHC engine (no it does not bolt into a second gen) that was very close (but not exactly the same) to the ZC. Since the Integra's are easy to find here in the US that is the reason it is cheaper.

Q - Do I need special mount kits or shift linkage for the ZC swap?
A - There is no need for mount kits or shift linkage for the ZC swap - it's is "identical" on the mounts and tranny to the D16A6 and D15Bx engines.

Q - I hear that the ZC engines aren't very reliable and have problems.
A - Two issues are at hand here - first is that these are used engines and despite the "30k" number everyone seems to throw around they are still used. The best thing you can do is ensure that you have a compression test done on your engine prior to having it shipped (expect 160psi or better in each cylinder) and better yet is a "leak down" test that determines through the use of compressed air, how much "leakage" each cylinder has and where it is leaking from. The second is that you should take the time to not only install it right but also replace all the parts that generally can be easily replaced (see a list of those parts here). Also try to get a newer engine (1991) engine if possible (check below for how to look for manufacture year markings)

Q - Do I need to rebuild the engine prior to putting it in?
A - This is really your choice. There is no doubt rebuilding it will add some life and reliability to the engine but in my opinion, the internals are generally fine (though leak down and compression tests would be a better way to determine this). If you plan on going forced induction with a turbo at something above 10psi then rebuilding with a better bottom end would be highly recommended.

Q - I hear that these engines come with broken parts - is that true?
A - Yes it is true. Not always but some engines come with various different parts broken - pulleys, sensors, throttle bodies and so forth. Is it a major problem? Not really, just replace the items with the stock items (such at the throttle body) or make a trip to the junk yard and get the affected part.

Q - I'd rather do a B-Series swap than a ZC swap.
A - By all means do it! The B-Series swaps are much greater horse power (as much as the 160hp range) but with that also comes much greater cost and complexity with B series swaps running well over $2000 without installation. I feel most people with reasonable technical skills should be able to swap in the ZC no problem.

Q - Do I need an Integra ECU for my ZC to work? Does it work better?
A - Even though you don't need a new ECU the engine does run better with the Integra ECU. You can purchase one from a Junk Yard or have your current ECU re-programmed (Si owners) by Zdyne (http://www.zdyne.com). The reason the 88-89 Integra is used is because that car came with the D16A1 engine, which was DOHC and very similar to the D16A8/9 (ZC).

Q - Do I need to purchase the ZC Transmission to work with the ZC engine?
A - Your current HF/DX/Si transmission will fit up to the ZC engine just fine. The advantage to the ZC transmission is it's equal length shafts (you must purchase new half-shafts for the ZC transmission) and it's lower gearing. The major issue with the ZC transmission is the short 5th gear - though you can take the internals from an Si and ZC transmission and mate them together. Exact ratios and clutch information can be found on my transmission page.

Q - Is $xxxx to much for a ZC Swap?
A - The answer to this depends - primarily on where you live and the if qualified people live in your area to perform your swap. The general "going" rate is about $500-600 for labor only by someone who is "very" qualified. I would not pay someone that has not done a swap to do your swap.

Q - I have a DX (Civic or CRX) and would like to do a ZC swap - can I?
A - Sure! Just take a look at the DX swap page for more information. Other than the additional wiring, it's the standard swap. Make sure you know EXACTLY which wires need to be spliced to which wires BEFORE you start.

What Did It Cost?
Everyone will tell you that it was, oh, $600 to pop in their ZC swap. I don't "half-***" too much and this swap wasn't any different. Here are ALL the costs of the swap that I incurred:

ZC Engine from Soshin Motors $550
Engine Shipping $73
Oil &Filter (Mobil-1), Engine Cleaners $39
Transmission Oil and Antifreeze $34
ACT Clutch from R&E Racing $276
Bosh O2 Sensor $35
"New" Radiator $175
"Pulled" Integra ECU $108
Rear & Crank Shaft Seals $35
Water Pump $54
One More Mount $35
Fuel Injector Seal Kit (all four) $32
A/C and Alternator Belts $32

 

Go to Passwordjdm.com , It is a alot better to go to this site , they guarantee that the engine will start up and there prices are not to bad at all. O yeah , I have 90-91 Si hatchback too.