ma71supraturbo said:
Changing the Deck height alone, would do nothing for displacement, it would only alter the compression ratio (assuming all else is equal).
To increase the displacement, you need any one of the three:
larger bore
larger stroke
more cylinders
(PS: the magazine quote you included mentioned an increase in the bore)
....and Porsche upped the size from 3.6 to 3.8 liters......just from BORE...
what happens if you increase the deck height.......that is ADDING to the motor....
People tend to think of this in metal terms...adding girth....well thats partially right.
The other way is just finding out what you can increase in size and keep the others the same to increase HP or TQ. Toyota did it the other way...... and they came out with a measly .5 liters bigger of displacement over ALL 6 cylinders...
now again. Imagine .5 liters spread over 6 cylinders...that is NOT MUCH AT ALL.
that is basically the difference in deck height alone. The extra height made the extra .5 liters...the BLOCK is the culprit of the "mysterious" .5 liters.
Porsche just increased the bore......kept the same crank and called it .2 liters bigger.....you could say thats a "stroked" motor....
I could just hear someone saying " yeah this new Carrera S has the STROKED 3.8 liter motor".....
.......