Maybe this should be in one of the other forums, but I'll start here.

I've always wondered why the coolant holes in the D16Z6 head gasket are different sizes, so I'm finally asking. The top and bottom layers have big holes, but the center layer blocks off a lot of those holes. In the pictures, the cylinder on the left looks blocked off quite a bit. Any ideas why? Any issues with removing the center layer and allowing full coolant flow?

 

Some kind of manufacturing short cut having to do with parts bin sharing?

 

Interesting point, but look at the second picture. The #1 cylinder on the right has a lot of coolant flow around it, but #4 doesn't. Any reason why that cylinder needs more cooling, or why #4 doesn't?

 

The cool fresh coolant enters the head at at Cy #4 so not to over cool it the hole sizes are small. and gets bigger towards Cyl #1. Its cooling basics.


Edo

 

Don't take out the middle! Ask me how I know I was spitting water all over the track, I'd just pit in when I heard the train whistle under my hood.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRX-RX &raquo;</TD></TR><TR><TD CLASS="quote">Don't take out the middle! Ask me how I know I was spitting water all over the track, I'd just pit in when I heard the train whistle under my hood. </TD></TR></TABLE>

He wont be H4 legal if he takes it out. Im sure he was just kiddin.

Edo

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EdoMoto &raquo;</TD></TR><TR><TD CLASS="quote">He wont be H4 legal if he takes it out. </TD></TR></TABLE>

Looks like gaskets are open..

7.1 Engine
q) Gaskets (including the use of phenolic spacers) may be replaced with others of unrestricted origin so long as they do not violate any other rules contained herein.

I can't see where it's in violation of any other rule as long as the engine still meets the compression rule. You probably know the rules a lot better than I do, but as I read the rules, it's pretty clear to me that "gaskets" are open. Am I missing something?


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRX-RX &raquo;</TD></TR><TR><TD CLASS="quote">Don't take out the middle! Ask me how I know I was spitting water all over the track, I'd just pit in when I heard the train whistle under my hood. </TD></TR></TABLE>

What was the problem?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EdoMoto &raquo;</TD></TR><TR><TD CLASS="quote">The cool fresh coolant enters the head at at Cy #4 so not to over cool it the hole sizes are small. and gets bigger towards Cyl #1.</TD></TR></TABLE>

Good point.. That makes sense.

 

If you search for the word "layer" in the all motor section there are lots of topics about removing the middile or top pieces.

https://honda-tech.com/zerothread?id=1532786

but it will raise comp.

heres a pic of an a6 gasket

 

are you allowed to use a thinner gasket in order to raise compression? i know it doesnt say it in the gasket area, but it may say something else somewhere in the rules reguarding engine. internals maybe.

 

Gaskets are free according to the rules.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by johng &raquo;</TD></TR><TR><TD CLASS="quote">Gaskets are free according to the rules.
</TD></TR></TABLE>

Where does it say gaskets are free Ill take a few. Need spares.


Edo

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by johng &raquo;</TD></TR><TR><TD CLASS="quote">
What was the problem?
</TD></TR></TABLE>

Overheating, I made it all the way to the track (3.5 hour drive) without any sign of problems, but once there under full throttle for extended periods it would overheat in about 10-15 mins. As stated earlier, that middle layer helps to distrubute the coolant flow.