Open deck engine : Easiest to cast also cheapest. Which is why this is put in Genesis Coupe...There is big empty water passage between cylinder wall and block, and thus theoretically unable to hold extreme cylinder pressure at high boost applications.
example :
bmw 3 series- open deck aluminum block
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Semi-closed deck engine : different casting method, more expensive and harder to cast than open deck. More cylinder wall rigidity than open deck but still,,its no closed deck.
example :
EvoX 4b11t - semi-closed deck aluminum block
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Closed-deck design : different casting method which requires more material and time. All of the engines which produce gobs of hp/displacement are closed-deck.
example :
Evo 4g63 - closed deck iron block
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supra 2jz-gte - closed deck iron block
Rb26dett is also closed deck iron block. e46 m3 engine is closed deck and e92m3 engine is closed deck aluminum block.
Iron sleeving could strengthen the cylinder wall and some say lots of people have been making good power with open deck engines. But displacement to displacement, open deck design will NEVER make same power output as closed deck design, much less aluminum block as opposed to iron block.
just look at supra block which makes 800whp safely on stock bottom.
Evo's 2 liter makes 1000+whp when built.
So not only internals are cast on genesis coupe, the block design is open deck. I guess we'll see how much power this can hold up.