Re: M engine - How would you build it?

Posted by Rootsy on August 09, 2007 at 12:21:13 from (24.176.33.123):

In Reply to: M engine - How would you build it? posted by CenTexFarmall on August 08, 2007 at 07:52:35:

Forget all about static compression ratio.. throw it right out the window...

Dynamic CR (cylinder pressure) is a better means for measuring an engine and looking at what it'll require for fuel. This is dependent upon intake valve closing relative to piston position.

Among other factors are quench distance, combustion chamber shape as well as piston crown shape. All of these influence flame propogation within the combustion chamber.

The amount of time, as stated above that the mixture is under pressure also plays a factor because as a gas is compressed it heats up. If heated to a point near it's ignition point you'll likely run into detonation issues if you have a non homogeneous mixture occuring or any hot spots due to sharp edges, etc in the combustion chamber or on the piston crown.

Keep a turbulent mixture, keep it from stagnating, use good geometry within the engine and keep the cylinder pressures in check and you'll be ok....

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