Type 4 mechanical compression ratio, Why is the factory compression so low? Options

[Beebo Kanelle]

OK, here's a fun one for the novice to ponder and you experts to answer:

Why is the factory mechanical CR so low?

and for reference, what is the highest mechanical CR that can be physically achieved? assume no octane limitations -

I'm just looking for the design limit for the highest CR that can be / has been in a Type 4 engine using available technology.

Thanks

[914_teener]

OK, here's a fun one for the novice to ponder and you experts to answer:

Why is the factory mechanical CR so low?

and for reference, what is the highest mechanical CR that can be physically achieved? assume no octane limitations -

I'm just looking for the design limit for the highest CR that can be / has been in a Type 4 engine using available technology.

Thanks

Might need some context to your questions;

ie. Octane is a fuel. So what is the engine? Internal combustion and what fuel?

Diesel uses compression for the spark plug and a A bomb uses tnt to start the fission reaction.

So for reference you need to add context to the question. When you say Octane I suppose you are referring to Octane rating. But what is the fuel?