Other than the obvious sticker on the back how else can you tell? I mean someone could have just stuck a sticker on it and called it one right? I have tried using the VIN decoders to find out and this is what i came up with JHMED9363LS

1st POSITION NATION OF ORIGIN
J = Japan

2nd POSITION MANUFACTURER
H = Honda

3rd POSITION VEHICLE TYPE
M = Passenger Car, Built in Japan

4th Thru 6th POSITION CAR LINE I ENGINE
ED9 = CRX, 1.6L

7th POSITION BODY TYPE I TRANSMISSION
3 = 3 Door Hatchback, Manual

8th POSITION GRADE, 1990-1993
6 = SiCivic3 Door
6 = HFCRX
6 = Si QRX

9th POSITION CHECK DIGIT

10th POSITION MODEL YEAR
L = 1990

11th POSITION ASSEMBLY PLANT
S = Suzuka, Japan


I guess i am confused by that 8th position, which one is the "6" referring to?Also, I checked the engine and it is a ZC... Can anyone tell me more about this car? Is there a way to know for sure that it is an SI? Is the ZC engine the standard SI engine? Also does the numbers stamped on the engine block need to match up with the rest of the VIN numbers (if they dont does that mean the engine has been swapped?)? Thanks

 

If it has a sunroof, it's an Si.

ED9 is an Si.

 

Crx/hf civics only the si had a sunroof. Also only the si had match colors bumpers if its still factory paint. A zc motor is jdm. Stock us si has d16a6 the si also had a diffrent transmission just to say.

 

only si crx had the sunroof and 90-91 have all wheel disc brakes. Look at the vin on the car and if it starts with jhmed9 i believe that also means si

 

Yes I have a sun roof and my entire car is black....As for the motor from what you are saying this is not the original(it was like it when i bought it)...is it good/bad that i have a zc in it now?

 

Either way, as I said, ED9 is an Si.

 

you have an si. a zc has more horsepower. what engine codes on your block?

 

a zc motor has more horsepower than a d series or a b series? oh this was a question not a statement im just getting into hondas so i didnt know smerky Mcsmerckerson

 

Sorry but i dont know how to check that. I looked at the stamp on the block and it said ZC then underneath there were a series of numbers like 6107701 is this what you are talking about?

 

LOL.. a zc is a d series... There's three main zc motors. Vtec non vtec and non vtec dohc. Depending on which you have the zc block is exactly the same as the us version. Non vtec zc is the same as a d16 a6 block. The head has slightly advanced timing on the zc over a a6. Vtec zc same as a z6. The dohc is roughly the same as a early Integra motor power wise but physicly diffrent. It's the easiest dohc d series to swap into a civic. Check the head code and see what head you have. I have a zc block with an a6 head so its exactly the same as an a6.

And no that is not the original motor. Zc motors only came in Japanese hondas

 

He doesn't know what he was talking about. Zc motors don't have a code. They are either vtec: not vtec. Or dohc. Which do you have?

Incase your not sure are the spark plugs in the front or back of the head

By code he would mean d16z6 or d15b2. Your motor only says zc.

 

Thanks for the info ill be doing a tune up this weekend and looking into this. thanks

 

That is incorrect.....The DOHC ZC is the top rated horse power D series motor and has almost identical power to a B18a....but it is not more powerful than all B series.

 

That is incorrect.....The DOHC and SOHC ZC is a D series motor, the DOHC is the top rated horse power D series motor and has almost identical power to a B18a....but it is not more powerful than all B series.

 

The plugs are on the top and the cover does not say VTECH in big bold letters as i have seen in other engines.

 

Sounds like non vtec

 

Not all vtecs say it on the cover. If they dont you look to see of the plugs are in the front of the cover or the back on the intake side.

 

In car is non vtec zc

 

All the crx had color matched bumpers, the Si was not different. The metal sunroof is a dead giveaway. Unless they did a roof swap, then the VIN should be accurate.

 

there you go

 

Plugs are on the back so its non vtec. If its a a6 head your running about 108 Ho 100 lb tourqe. Zc head is slightly higher because of the cam being advanced about a half tooth.
Is the intake really loud?

 

Thats pretty subjective and I dont know how to qualify it being too loud. Its not loud enough to be annoying.... hope that helps

 

I am going to change the plugs, wires, cap and roter, oil, and check the timing this weekend. what should i look for to know if it is an A6 head or not? thanks

 

I know the a6 says pm3 in the had. Think the zc is diff. Not sure what it Is.