Quench on a Turbo?

[bookworm007]

I know that on a N/A engine you want the smallest quench you can get away with before valves and pistons try to occupy the same space. But I remeber hearing that on turbo motors you really don't have to worry about it. I read that Quench increases the turbulence in the combustion chamber thus making the fuel air mixture burn better. So does a turbo creat enough turbulence in the chamber that the quench effect is unneeded?

 

[Quick 8]

Quench is definitely important. Even more important on a turbo engine than an NA engine. You might want to read this article:

http://www.enginebuildermag.com/Article ... power.aspx

The engine in the article has a blower, but the effects are the same.

 

[Anlushac11]

The Article was also written by David Vizard who is something of a legendary engine builder.

 

[bookworm007]

Thank you for that article it was a great read and better yet I understood it all! Well now its time to research a combo that can give a smaller quench without high compression hopefully

 

[Quick 8]

From a relative standpoint, the only way to get good quench with low cr is to have a relatively large combustion chamber.

 

[Thad]

A flat top piston with a "D" shape pocket at zero or deck plus .008 ". Pocket shape and location should mirror the combustion chamber it faces. Volume of pocket will dictate CR. Common practice, on low compression engines.