[birkey]

I cant remember where i read this, but someone said that a dished piston with a properly designed combustion chamber can promote better flame travel than a flat top. is this all talk or is there hidden science behind this theory? do valve reliefs affect combustion at all?

[techinspector1]

Originally Posted by birkey

I cant remember where i read this, but someone said that a dished piston with a properly designed combustion chamber can promote better flame travel than a flat top.

It would take a whole bunch of explanation to convince me.

Originally Posted by birkey

do valve reliefs affect combustion at all?

The very fact that they are there at all means that they will affect SOMETHING to a certain degree. Whether it is measureable is another question.

[vinniekq2]

Contact union76 they are very very helpful about helping out people asking about fuels.They will fax a lot of very good information directly to you. The information goes a little scientific sometimes but there is enough information available to really get an idea of what fuel does when it burns. Also ask them to fax information about additives,tell them you are a racer.

[birkey]

will do, thanks

[hcompton]

Originally Posted by birkey

I cant remember where i read this, but someone said that a dished piston with a properly designed combustion chamber can promote better flame travel than a flat top. is this all talk or is there hidden science behind this theory? do valve reliefs affect combustion at all?

If your talking about chevy sb heads for the most part no. But if the head is very flat they can make the combustion chamber in the pistons. But not needed on chevy motors. Flat tops are best for small block chevy. Other engines need different pistons to promote good travel. Hemis need pop up pistons to push the fuel/air mix into the top of the chamber to promote good flame travel. This usally just means pushing all the gases right up against the spark plug area. Inside a pocket giving the proper compression.

Yes and no on the valve reliefs. If they are sharp they can promote detenation. Smoothing them over a little just to break the edges is normal. But they do not effect flame travel. Some swirl devices do Sometimes but are designed to work with this in mind.