Originally Posted by pleaidestar
That 18/25d hybrid sounds neat for sure..it should work in the theory, I just wonder how the galleys and jackets line up or even if the headgaskets are the same.
If the block and heads are basically the same then the the rods and stroke are probably just shorter, said the rods aren't forged in the 1.8. though,That would be a good dual cam turbo motor. That means the exhaust mani and downpipe from ej22t would work too (in theory. ...kinda sounds like a crazy little build.
Well, the 18e/25d hybrid consisting 18E heads & 25D block will work. Compression will be amazingly high, over 11s for sure.
18E heads on an 22E will raise compression on that combo. The oil ports will line up just fine & the coolant ports will be fine since the open deck design will allow good passage from head to block.
Whatever head gasket you get would need to match the design on the heads to withstand the internal combustion pressures without worry.
The exhaust will fit since the 18E is dual port just like the 22E & 25D. They even have the shared benefit of header options.