Something seriously embarrassing happened a couple days ago. Its looking like I am going to have to take the head off of my block. Since my car is turboed I thought it would be nice to shave a few degrees off the compression ratio. I also plan to buy a port and polished head from a friend which also comes with a port and polished intake manifold. Where can I buy a slightly thicker head gasket? Is this information correct: For every 0.01 you increase over stock thickness, you decrease compression 0.3? Thx

 

lower compression with pistons, not head gaskets.

 

you can do it with headgaskets if you want. Going a little thicker wont cause any damage. However, going with really thick gaskets can induce detonation and other harmful effects.

Cometic makes a "stock" thickness at .030 (stock is .026). I'm running a .051" which lowered my compression from 13.2:1 to 12.2:1.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote"> However, going with really thick gaskets can induce detonation and other harmful effects.

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

Why is that?

 

what brand head gasket are you running?

 

that measurement is done after it is compressed correct ?

 

I think in a perfect world your head gasket should be .050. it gives you the perfect amount of room for advancing and retarding. thats is my option.

 

Leah, what happened to it dude?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by amalby &raquo;</TD></TR><TR><TD CLASS="quote">I think in a perfect world your head gasket should be .050. it gives you the perfect amount of room for advancing and retarding. thats is my option. </TD></TR></TABLE>

o rly?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote"> However, going with really thick gaskets can induce detonation and other harmful effects.</TD></TR></TABLE>

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

Why is that?</TD></TR></TABLE>

I'm thinking it has to do with increasing the size of the combustion chamber, which reduces quench, and therefore increases the chances of detonation, correct?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">
I'm thinking it has to do with increasing the size of the combustion chamber, which reduces quench, and therefore increases the chances of detonation, correct?</TD></TR></TABLE>



greater quench distance is a less efficient combustion and can lead to detonation. Not always tho. But it is a variable.