Yeah, so last weekend, the head gasket went on my stock model 1991 CRX SI. Since the head was dissassembled and cleaned up at the machine shop, i thought it would be a great opportunity to install an extra jdm sohc ZC camshaft i had sitting round that came from a 1990 FI model engine.
I was suprised how much different the car drove. I have mixed feeling about it. My original cam has ok low end and mid range, but really opened up and would fly into redline.
The ZC cam had noticably more low end and mid range, but didn't have quite the same kick into redline as the regular A6 cam.
Overall, the zc cam seems to have slightly more usable power for regular street driving. I guess the is always some type of trade off when messing around with different grinds.

Just thought i'd share my experience, since so many people have wondered in the past.

 

interesting... I did the A6 cam into my dx motor a while back... since then sold several A6 cams on ebay with instructions lol.... but ya the A6 cam is good I have to say.

 

did the ZC cam you put in have a funny lobe on the distributor end? just making sure its not the carburated version.

the measured difference between ZC MPFI and A6 is just .005" extra on the intake lobes compared to the A6 cam. its otherwise the same. so your feedback is a bit surprising.



http://www.norcalcrx.org/tyson/SOHC_Cam.html





Modified by Tyson at 12:48 AM 11/10/2005

 

you could do a 92+ sohc zc non vtec coultn't you? or am I making such an engine up? lol...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aaronhume &raquo;</TD></TR><TR><TD CLASS="quote">you could do a 92+ sohc zc non vtec coultn't you? or am I making such an engine up? lol...</TD></TR></TABLE>

same engine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tyson &raquo;</TD></TR><TR><TD CLASS="quote">did the ZC cam you put in have a funny lobe on the distributor end? just making sure its not the carburated version.
</TD></TR></TABLE>

I personally dissassembled a FI ZC someone had brought in that had over reved the engine. I pulled the cam, and junked the rest of the engine.
With the ZC cam now installed in my A6 motor, the idel seems to have improved, and i really do seem to have more mid range powerband.

 

With such a small difference as this, the way a car feels is not an indicator of whether it gained or lost power. If you like how it feels, great. If you want to make power claims we're going to need to see some dyno graphs. You'll be surprised if you compare your feeling against the real numbers. I know I have.

 

well see, heres the thing. id rather hear from you if the cam had the funky fuel pump lobe than if it came out of a FI engine. because most likely, if it was a carbed engine originally, after it got shipped here and before it got installed in the new car, all that crap would have been stripped and all the MPFI stuff put on, and the fuel port closed up. so dont be confident that because you took it off a FI car, its an FI cam. ive seen it done before, and ive seen others mistake it who didnt know better.

i just want to know if it had the funky lobe to be sure.

 

Yeah i noticed that also,i had an a6 in my white hatchy and it had a zc cam that i put in,and i liked the powerband,but it seems like it has less topend then the a6 cam....

 

and did yours have the funky cam lobe or not?

what header or exhaust manifold did you guys use?

btw, i dont mean to say your input is nonsense. im actually intrigued by the response, i wanna figure it out.

 

need dyno and cam pics

 

since the topic is cams..

Any one know how it ID a DX cam from a SI cam, without a cam card and a dial gauge

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Outsane &raquo;</TD></TR><TR><TD CLASS="quote">need dyno and cam pics</TD></TR></TABLE>

It won't be from me...not even worth the dyno time....my 91 CRX SI cost only $650 to begine with.

 

I have a 90 Civic Si with a non Vtec SOHC ZC and a 93 Civic hatch with a Vtec OBD1 SOHC ZC. I wouldn't say either is noticeably faster than their stock SI counterparts.

 

I have a SOHC ZC and I think it much better than the A6. Better low and mid range, and I would say about even top end with the A6. My A6 was pretty tired and blew up in the end, so it may not be a good comparason. However, my SOHC ZC kept up with a friends Z6 in his CR-X no problem. In a drag race he would beat me by not even a car length, my front bumper at his rear wheel. Soon enough it wont matter though as I am swapping a rebuilt Y8 head, p&p and milled 0.003 for my mini me

 

I have been running the SOHC ZC that was carburated in my 88 CRX with JRSC. I did not know that there was a difference between the carburated cams and the FI. I might have to try my original 88 cam to see if it makes a difference.

 

the original 88 si cam is a little different than the 89-91 cam. Also, the a6 89-91 cam is suppost to be the most sought after D series cam because of the agressive lobes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by UltimX &raquo;</TD></TR><TR><TD CLASS="quote">Also, the a6 89-91 cam is suppost to be the most sought after D series cam because of the agressive lobes.</TD></TR></TABLE>

how can you say that when the JDM ZC cam has even larger intake lobes...

 

Does it have a nice lumpy idle now??..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.speaker &raquo;</TD></TR><TR><TD CLASS="quote">Does it have a nice lumpy idle now??..</TD></TR></TABLE>

i highly doubt it this is a stock cam...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.speaker &raquo;</TD></TR><TR><TD CLASS="quote">Does it have a nice lumpy idle now??..</TD></TR></TABLE>

I swear to you when i say this, but actually idels more smoothly, and picks up just a little stronger upan acceration off of idel. The low end is very nice now.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by UltimX &raquo;</TD></TR><TR><TD CLASS="quote">the original 88 si cam is a little different than the 89-91 cam. Also, the a6 89-91 cam is suppost to be the most sought after D series cam because of the agressive lobes.</TD></TR></TABLE>

Do you think the 88 cam would be better than the Carburated ZC cam?

 

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

how can you say that when the JDM ZC cam has even larger intake lobes... </TD></TR></TABLE>

Key word: "suppost"

also, if start, finish, and peak lift are all the same, how can the actual lift be different?

 

peak [intake] lift is not the same. its .005" larger.

 

on that chart you posted, it says intake peak lift is the same as the a6 as both carb and mpfi zc.