I'm posting for a friend...I don't know anything about SOHC ZC's so please forgive me...


I need very quick help with a piston issue...basically, all I need to know is what pistons do I use out of a USDM 1.6 SOHC in this SOHC ZC block. I need them to be stock compression if at all possible. I need this answer quickly and I will continue searching...all of this going into a EF hatch.

thanks people, this motor has to figured out by friday for my friend. I appreciate the help.

Chris


Modified by DAantagonist at 10:35 AM 9/28/2005

 

Same as in d16a6 88-91 SOHC SI and EX

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hankish &raquo;</TD></TR><TR><TD CLASS="quote">Same as in d16a6 88-91 SOHC SI and EX</TD></TR></TABLE>

thank you VERY much...

 

Only difference in that whole motor from D16A6 is the camshaft .

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dr_latino999 &raquo;</TD></TR><TR><TD CLASS="quote">Only difference in that whole motor from D16A6 is the camshaft .</TD></TR></TABLE>

so there will not be any clearance issues or ANYTHING with this. that's awesome...and makes my life EASY.

thanks guys.

 

da16a6 is the same thing everything is interchangeble to a sohc zc, ive done it b4

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dr_latino999 &raquo;</TD></TR><TR><TD CLASS="quote">Only difference in that whole motor from D16A6 is the camshaft .</TD></TR></TABLE>

thats not true. the sohc zc does have a more aggressive cam, but it also has different pistons. the d16a6 has flat top pistons and the sohc zc has domed pistons giving it a higher compression ratio

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by scrapin_frame &raquo;</TD></TR><TR><TD CLASS="quote">thats not true. the sohc zc does have a more aggressive cam, but it also has different pistons. the d16a6 has flat top pistons and the sohc zc has domed pistons giving it a higher compression ratio</TD></TR></TABLE>MYTH ALERT - If that was true the SOHC ZC would need a different combustion chamber to equalize back out to 9.1:1 compression ratio that it shares with the D16A6.

 

hmmm well the sohc zc motor i just sold had domed pistons. from what i've read, and believe me it was hard to find.. the single cam uses the same pistons as the dual cam zc.. i have yet to pull apart one of the 2 dohc zc's i currently have sitting in my shop, but i do plan on getting another sohc zc, so perhaps i can pull both apart and do a comparison
i find it hard to believe that the cam alone adds 20hp

 

obd2 SOHC ZC's had 9.4 compression. all other single cam ZC's had the same 9.1 CR as A6, which are more common due to age.

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

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by scrapin_frame &raquo;</TD></TR><TR><TD CLASS="quote">
i find it hard to believe that the cam alone adds 20hp
</TD></TR></TABLE>

its not 20hp difference. nominally, its about 10hp difference (118hp-108hp), but A6 is clearly underrated by the factory anyway. also consider the exhaust manifold is different (4-1 vs 4-2-1). so the difference is much less than 20hp... and then, this is ONLY comparing MPFI engines. the carbed ZC is another unique cam.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tyson &raquo;</TD></TR><TR><TD CLASS="quote">obd2 SOHC ZC's had 9.4 compression. all other single cam ZC's had the same 9.1 CR as A6, which are more common due to age.

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

its not 20hp difference. nominally, its about 10hp difference (118hp-108hp), but A6 is clearly underrated by the factory anyway. also consider the exhaust manifold is different (4-1 vs 4-2-1). so the difference is much less than 20hp... and then, this is ONLY comparing MPFI engines. the carbed ZC is another unique cam. </TD></TR></TABLE> Go Tyson go! Don't make me whip out my D16A6 dyno graph of 113whp to the wheels!

 

thanks, anyone else?

 

my sohc zc can beat DOHC ZC all day long...i/h/e......mine came with pm7 pistons....dohc pistons......so sum sohc zc's do come with domed pistons...so whoever thinks they dont do more research buddy...i will take my head off and take pics for u...i bought the engine like that.....i have not done anything to it internally at all.....ive heard these zc's r hard to find...

 

sohc zc's DO come with domed pm7 pistons
dohc zc's also come with domed pm7 pistons
d16a6's came with flat top pistons

 

Um the only thing differen't is the cam on an A6??, wtf. So you mean to tell me that the d15b2 88-91 DX motor also had a iron main bearing assembly on the block also?. EDIT: I forgot to add, i wouldn't think the D15b2 is as STRONG as the D16a6, or at least i don't think so?.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by d16vtecx &raquo;</TD></TR><TR><TD CLASS="quote">sohc zc's DO come with domed pm7 pistons
dohc zc's also come with domed pm7 pistons
d16a6's came with flat top pistons</TD></TR></TABLE> Jesus help me.......
Again, the only difference is the camshaft. If you have other pistons they were added at a later point. Just because you purchased the motor and didn't touch does not mean someone else down the line didn't fiddle with it. The CR is exactly the same so if there are domed pistons like the DOHC ZC the combustion chamber would match the DOHC heads. If it didn't, the compression would be nice and up there.

 

some ppl just cant be bothered to click a link and READ information.

JDM ZC Sources



1984-1987

DOHC ZC MPFI 9.3 CR 135 ps / 6500 RPM ( Integra Gsi, Rsi, Civic / CRX Si)

DOHC ZC Single CARB 9.3 CR 115 ps / 6500 RPM (Integra ZS, LS)

DOHC ZC MPFI 9.3 CR 120 ps / 6500 RPM (4dr Integra Gsi)

DOHC ZC SINGLE CARB 9.3 CR 100 ps / 6500RPM (4dr Integra & hatch GS, ZS)



1988-1991

SOHC ZC DUAL CARB 9.1 CR 105 ps / 6300 RPM (Integra ZX, RX)

SOHC ZC MPFI 9.1 CR 120 ps / 6300 RPM (Integra RXi, Txi, CONCERTO)

DOHC ZC MPFI 9.5 CR 130 ps / 6800 (CIVIC/CRX Si) DYNOS



1992-1995

SOHC ZC DUAL CARB 9.1 CR 105/6300 (PS/rpm) (Integra ZX)

SOHC ZC MPFI 9.1 CR 120/6300 (PS/rpm) (Integra ZXi)

SOHC ZC VTEC MPFI 9.2 CR 130/6600 (ps/rpm) (Domani Vi)

DOHC ZC MPFI 9.5 CR 130 ps / 6800 RPM (Civic Ferio RTSi and Special Edition Civic Si) DYNOS



1996-2000

SOHC ZC MPFI 9.4 CR 120ps/6400 RPM (Integra)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tyson &raquo;</TD></TR><TR><TD CLASS="quote">
1996-2000

SOHC ZC MPFI 9.4 CR 120ps/6400 RPM (Integra)

</TD></TR></TABLE> Is this one based off the Y7/Y8 blocks or is it still related to the A6?

 

http://www.honda.co.jp/HOT/Mod....html

displacement 総排気量（cm3）
1,590

bore and stroke 内径×行程（mm）
75.0×90.0

compression ratio 圧縮比
9.4

whats y7/y8 block specs?