As detailed in another UOA I posted, it looks like I will be looking for a new shortblock for my turbocharged '05 Subaru Legacy GT soon. I began by only considering OEM replacement options because I wanted a long-lasting engine; that is before I discovered engine coolant pre-heaters. While I'm aware of freeze plug and oil pan heaters, I'm primarily interested in getting the entire engine's internals closer to operating dimensions before the engine ever turns over. My understanding is that the primary reason forged engines suffer shorter lives is because of thermally contracted pistons at startup. Following that logic, solutions that actively circulate coolant throughout the entire block will pre-heat the internals more evenly. Both the Webasto and Eberspächer will heat coolant up to 80°C or 176°F.
All other factors being equal, are there any reasons why an engine with forged internals would not last as long as one with cast internals with a coolant pre-heat system?
According to this neat chart I've found from Engine Builder Magazine, raising temps to 176°F get 4032 and 2618 pistons less than halfway to their final (approx. 572°F) operating dimensions.
All other factors being equal, are there any reasons why an engine with forged internals would not last as long as one with cast internals with a coolant pre-heat system?
According to this neat chart I've found from Engine Builder Magazine, raising temps to 176°F get 4032 and 2618 pistons less than halfway to their final (approx. 572°F) operating dimensions.