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

[veekry9]

https://www.youtube.com/watch?v=zcPGfjUO3Yg


https://www.youtube.com/user/GrasshutPerformance/discussion
https://en.wikipedia.org/wiki/Julius_Mackerle
Turbo,efi,titanium weight-loss,auxiliary head and piston cooling,21st century sensors.
The heads lifting off will need a cure,like o-ringing them on to the nickies,stiffening the heads.
Note the use of modern off the shelf rods,as an economy.( Honda B16A H beam con rods)
Maximum effort calls for maximum control of heat in fine resolution.
An aluminum liquid coolant tube inserted into the head to sink heat will work too.
Not quite HD,but a bridgeport mill op,to keep a cool head.
The use of modern coatings to reduce friction and conduction is effective.
There,I spent some money for you,as any thing is possible.Methanol/Nitro fuel engine?
CadCam a set of new three valve heads you can graphite diecast for cheap and have a prototype shop do a short run on speculation.
I'll give you their number:
http://www.armstrongmold.com/pages/graphite_die_casting.html
(IMG:style_emoticons/default/happy11.gif)

/
Reading,it's good fer yuh.

Julius Mackerle: Air-Cooled Motor Engines, Cleaver-Hume Press, London 1961
Julius Mackerle: Air-Cooled Automobile Engines, The Institute of Mechanical Engineers, London 1961-2