boredracer408

I've got a bunch of spare sohc motors and i wanted to play around with my spare z6 motor. Whats the highest compression OEM piston I can put on my d16z6?


Modified by boredracer408 at 11:21 PM 3/29/2004

MrIllegalX

9.6 i believe

Shawn C

iTrader: (1)

nah, throw 88-89 D16A1 integra pistons in there. they are the highest dome oem usdm d-series pistons
and very cheap

JDMisGOOD

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ShadyEH2 &raquo;</TD></TR><TR><TD CLASS="quote">nah, throw 88-89 D16A1 integra pistons in there. they are the highest dome oem usdm d-series pistons
and very cheap</TD></TR></TABLE> really? i never knew that! BUMP for you!

liam821

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ShadyEH2 &raquo;</TD></TR><TR><TD CLASS="quote">nah, throw 88-89 D16A1 integra pistons in there. they are the highest dome oem usdm d-series pistons
and very cheap</TD></TR></TABLE>

And even better - is the JDM dohc ZC pistons (PM7). They will give almost 12:1 compression on a z6 motor.

I have a set for sale, 75mm std bore in good condition if you want - includes rods. PM me.





liam

allmotaeg6

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ShadyEH2 &raquo;</TD></TR><TR><TD CLASS="quote">nah, throw 88-89 D16A1 integra pistons in there. they are the highest dome oem usdm d-series pistons
and very cheap</TD></TR></TABLE>

using those along with a D16y8 2 layer headgasket will give you close to 14.1:1cr

now that would be bad ***

liam821

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pr0ject Eg6 &raquo;</TD></TR><TR><TD CLASS="quote">

using those along with a D16y8 2 layer headgasket will give you close to 14.1:1cr

now that would be bad *** </TD></TR></TABLE>

hate to break it to ya - but the y8 head gasket is a 3 layer gasket. And its the same thickness as the z6.

Also ZC pistons in a z8 will give you about 12.x compression. Not 14:1.

y7/y8 headgasket p2j




liam

AzCivic1.6

civic gx pistons.

liam821

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AzCivic1.6 &raquo;</TD></TR><TR><TD CLASS="quote">civic gx pistons.</TD></TR></TABLE>

The problem with GX pistons is the valve relief...none on the exhaust and hardly any on the intake side.

here is a GX piston

98-00 GX
D16..
total height: 49.28mm
compression height: 30.50mm
2.50mm dome



liam

Tad

hmm, interesting stuff.
I was going to make a separate thread about this but I figured I might as well ask in here because its kinda on topic.

What is the difference between using a taller piston, and a shorter headgasket?
if you were chosing one or the other,
and each would yeild the same CR
why would one be better than the other??

thanks.

AzCivic1.6

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by liam821 &raquo;</TD></TR><TR><TD CLASS="quote">

The problem with GX pistons is the valve relief...none on the exhaust and hardly any on the intake side.

here is a GX piston

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

how do they get it to work in the GX engine? different head setup?

liam821

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AzCivic1.6 &raquo;</TD></TR><TR><TD CLASS="quote">

how do they get it to work in the GX engine? different head setup?</TD></TR></TABLE>

Thats my guess - just a different head design. It would have to be. I dont know what the GX head looks like so i really couldnt tell ya.

liam

sk8rmike

i've held both the y8 and z6 headgasket in my hands at the same time...and while they are both 3 layers...i noticed the y8 seemed noticeably thinner...

SloCivicHMM

you can remove the center layer to make it 2 layer.....

liam821

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tad &raquo;</TD></TR><TR><TD CLASS="quote">hmm, interesting stuff.
I was going to make a separate thread about this but I figured I might as well ask in here because its kinda on topic.

What is the difference between using a taller piston, and a shorter headgasket?
if you were chosing one or the other,
and each would yeild the same CR
why would one be better than the other??

thanks.</TD></TR></TABLE>

When you say "taller piston" im thinking you mean has a larger dome. You cant use a "taller" skirt (ie piston goes beyond the height of the deck) because it will impact with the head.

A larger dome will increase the compression however - and so will decreasing the head gasket height. However - a head gasket is 0.037 inch high (0.93mm) so you cant really get much of a change. You can mill a few mm off the bottom of the head causing the compression ratio to increase also.

When milling the head or using thicker/thinner head gaskets you have to worry about your timing. For each .012" (0.30mm) = 1 degree of timing change. So if you use a 2mm head gasket your changing the timing a fair amount.

Now the difference between in performance - i sorta have an idea but is hard to explain. Anybody?

liam

liam821

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sk8rmike &raquo;</TD></TR><TR><TD CLASS="quote">i've held both the y8 and z6 headgasket in my hands at the same time...and while they are both 3 layers...i noticed the y8 seemed noticeably thinner...</TD></TR></TABLE>

Ive measused the gaskets - and they are both the same.

liam

dohcMONSTER

will these pistons also work in a d16y8? what would the comp ratio be on the y8, the same as a z6?

liam821

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sohcMONSTER &raquo;</TD></TR><TR><TD CLASS="quote">will these pistons also work in a d16y8? what would the comp ratio be on the y8, the same as a z6?</TD></TR></TABLE>

Yea the pistons work in a y8; the y8 has a smaller combustion chamber - 32.8cc vs the z6's 34.6. That increase gives you ~0.2 increase in your compression ratio. Its going to be a little over 12:1.

liam

SloCivicHMM

you guys are talking about the JDM ZC pistons right?

What stock pistons can I throw in my DOHC ZC to up the compression??

liam821

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SloCivicHMM &raquo;</TD></TR><TR><TD CLASS="quote">you guys are talking about the JDM ZC pistons right?

What stock pistons can I throw in my DOHC ZC to up the compression??</TD></TR></TABLE>

Honda doesnt make any. If you want to increase the compression in your dohc ZC you are going to either have to mill the head or use aftermarket pistons.

liam