I was wondering what makes the extra power, 129 compared to 108. Thats quit a bit more power to have on tap. I do not know much about the zc therefore i ask. I realize the cam is stronger and built a little for higher revs, but what else makes it that great? Any and all help, or just a link to tell me whu? would be great too.

Thanks,
Matt

 

well are you talking about the dohc first off that is part of it as well as the domed pistons....... that is the other part.....external oil cooler.....

 

Alright, if the dohc zc has 129 hp, then how much power does the sohc zc have. Becasue i have heard both have around 130 hp?

Matt

 

d16a6-108hp
DOHC ZC-130
Single cam ZC(basically just like the A6)-120..or so i have been told

 

I think the sohc zc has a more aggressive cam profile.

 

if that was so, i still dont see getting 10 horsepower from a stock cam with a good idle on a non VTEC engine..

the sohc zc is supposedly rated at 118ps or so,

i know the internals are identical, as well as the intake manifold and head, the cam could be different, as well as ECU tuning and exhaust manifold, exhaust, and some others.

 

For the sake of being correct;
dohc zc (blacktop): 130 ps...128 hp
sohc zc: 120 ps...118 hp

quoted straight from the Honda Press Archives

 

the dohc is usually a much stronger motor, especially when boosted

 

SOHC ZC has different cam and the combustion chamber shape is a little different, hence a little more in compression. I forgot all the facts, but i read up a lot of them a few months back and found out the A^ head and the SOHC ZC head are pretty different. A SOHC ZC guru told me that if you put a SOHC ZC head onto an A6 block, the compression will go up quite a bit, but if you put an A6 head on a SOHC ZC block, youll actually lose compression. I wish i remember the guys name.

Edit: here's a post i made about SOHC ZC heads, and the guy that told me all the info on SOHC ZC's is "Superhatch"

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ThE bEe GuY &raquo;</TD></TR><TR><TD CLASS="quote">SOHC ZC has different cam and the combustion chamber shape is a little different, hence a little more in compression. I forgot all the facts, but i read up a lot of them a few months back and found out the A^ head and the SOHC ZC head are pretty different. A SOHC ZC guru told me that if you put a SOHC ZC head onto an A6 block, the compression will go up quite a bit, but if you put an A6 head on a SOHC ZC block, youll actually lose compression. I wish i remember the guys name.

Edit: here's a post i made about SOHC ZC heads, and the guy that told me all the info on SOHC ZC's is "Superhatch"</TD></TR></TABLE>
Actually Superhatch and I are going to be completely ripping apart his SOHC ZC and finding out once and for all what all the differences are. So that means measuring everything find out all the specs for the heads and such and also seeing if there are any differences in the blocks, The piston HEADS are the same but that doesnt mean the crank is the same or the stroke for that matter so we'll be trying to figure it all out. Cant say when exactly cause he has been working out of town but we are both looking forward to doing it so expect it soon enough its going to be a hell of a write up too!! Lots of pics and specs just so more questions will have answers.....

Oh and after that expect a nice SOHC ZC build up also since once that is done we will have some fun and build up a frankenstein D-series Possibly the combination of the D15,D16, and the SOHC ZC or possibly just the ZC and A6?? Who knows we dont have it all figured out quite yet?? But it should be fun and interesting at the same time...lol

 

Your also forgetting the intake and exhaust manifolds, perhaps there are slight differences there, and when added with the larger cam = more hp. I've heard the dohc zc intake mani is one of the best flowing D-series manis

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AaronJ &raquo;</TD></TR><TR><TD CLASS="quote">d16a6-108hp
DOHC ZC-130
Single cam ZC(basically just like the A6)-120..or so i have been told</TD></TR></TABLE>

yeah about 120

i have the sohc Zc...im using the 88 intake mani, 88 wiring harness, 89 ecu in my 89...its not tooo bad, i mean yeah, its slow but #'s and what i have, its decent.....i ran at the track on saturday, went 15.6@88 just with exhaust, everything else is completely stock..itd not a bad motor, doesnt burn oil and it drives pretty good

 

sohc zc block/rods/pistons/crank = d16a6.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91civicDXdude &raquo;</TD></TR><TR><TD CLASS="quote">sohc zc block/rods/pistons/crank = d16a6.</TD></TR></TABLE>

but why does the d16a6 only have what 108 hp?

 

Because it's a simple rumor that the sohc zc makes more power than the a6. I have two buddies, one has a 90 hatch, the other has a 91. The 91 has the original a6 with 146,000 on the odo. Smokes like a freight train. Has an obx intake, dc 4-2-1, and a no name exhaust.

90 hatch has a "documented" 40k sohc zc and runs GREAT. Same intake, same header, different exhaust.

We went to PIR to see if there was a difference. I drove both cars. For the sake of argument we ran open cat (both had "high flow" ebay cat put on between 5 and 10k ago)

Both ran on steelies with 195/55/14(I think) dunlop gt qualifiers. When comparing runs with similar 60's (ie: comparing two that both have a 2.2 60) the cars ran very similar times.

I don't remember exactly, but when the 60's were pretty damn close, the run's were within 1 or less than 1 tenth of a second.

If you believe otherwise, show me a dyno of an a6 and a zc with very similar miles, and the same mods.

Sorry, but I've ridden in many sohc zc equipped cars, and they seemed no different than higher mileage a6's.

 

My SOHC ZC had more power than my A6 motor. The A6 motor had 160K miles on it, and was owned by an old lady. I have no idea what exact mileage my ZC had, but with the same mods it pulled a LOT harder. Maybe it was because the A6 was older, i dunno, but the SOHC ZC does have more power. There's no way to totally compare a same milage A6 and SOHC ZC and compare the exact HP, there's way too many variables.

 

Ok you guys got me very curious with this..

Reason being is i have a sohc zc in my garage with rod knock, I was also wondering if the I could use the zc head on my d16a6.

Can anyone confirm this?

Mig

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Silver_Rex &raquo;</TD></TR><TR><TD CLASS="quote">Ok you guys got me very curious with this..

Reason being is i have a sohc zc in my garage with rod knock, I was also wondering if the I could use the zc head on my d16a6.

Can anyone confirm this?

Mig
</TD></TR></TABLE>

Yep you can, also vice versa. I was told the SOHC ZC head on an A6 block will also bump up compression

 

Man If I had known early (like 3 weeks ago). I would have swaped out that head when I have to replace my headgasket cause I blew it..

Damn..

Mig

 

so potent?

118 hp versus 108 hp. I would call that a decent bump...not exactly "potent".

 

if someone has a SOHC ZC head and a D16A6 head, do me a favor and check for the head stamp code. If they are the same, guess what... the heads are the same.

This is known, the blocks are 100% identical, if the heads are 100% identical, the only difference would lie in the ECU tuning, cam, and exhaust manifold (i believe the SOHC ZC has larger primaries than its USDM counterpart.. i've seen them on ebay before.)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91civicDXdude &raquo;</TD></TR><TR><TD CLASS="quote">if someone has a SOHC ZC head and a D16A6 head, do me a favor and check for the head stamp code. If they are the same, guess what... the heads are the same.

This is known, the blocks are 100% identical, if the heads are 100% identical, the only difference would lie in the ECU tuning, cam, and exhaust manifold (i believe the SOHC ZC has larger primaries than its USDM counterpart.. i've seen them on ebay before.)</TD></TR></TABLE>

Talk to Superhatch, he will assure you that both heads are in fact NOT the same.

 

thats nice to know, considering i ASKED if they were the same.

I want to know the head numbers for each head, im assuming the d16a6 has a pm6 casting?

 

my sohc zc with header, exhaust, intake, runs like a dream, pulls like a bitch from 4--6500rpm's definitly better than a a6 with same mods

 

"my sohc zc with header, exhaust, intake, runs like a dream, pulls like a bitch from 4--6500rpm's definitly better than a a6 with same mods"


DITTO