JakeFusion

iTrader: (7)

So, I've had an interesting side debate on this, but I'm not fully sure why the recommended bore for head gaskets is relative to the combustion chamber if it is larger than the engine bore.

Now, I understand you don't want gasket overhanging in the cylinder, but if the combustion chamber extends beyond the bore and over the cylinder liners, what difference is there with an MLS gasket being present over the cylinder liner vs bare liner?

What is the downside to running a gasket that matches the engine bore but not the combustion chamber?

For example, say you run the stock 3.898" bore with a 4.125" combustion chamber. And you run either a 3.910 gasket or 4" gasket. Will detonation occur? If so, why would it? There is no fire ring on MLS gaskets. I don't know how MLS gaskets take heat vs the cylinder liner, so maybe the cylinder liner could take the heat better than the gasket? Just trying to understand something that everyone talks about, but I've never really seen or heard why.

JakeFusion

iTrader: (7)

Hmm... no informed input?

bottlefedbaby

I've wondered that for a really long time... definitely interested to see what comes up..

dr_whigham

iTrader: (49)

My understanding has always been carbon buildup, which you and I both know leads to detonation.

Maybe it builds easier on that small surface of head gasket than it does the cylinder liner?

Damn. Good question...

JakeFusion

iTrader: (7)

Yeah see. This is why I'm asking the technical rationale behind it.