Justin DuBois
DSM Wiseman
- 3,286
- 3,263
- Aug 15, 2019
-
Oakland,
California
MHI - TDO5H cartridge journal bearing turbo's have an internal aperture in the oil channels to regulate the pressure to the bearings - and feeding from the OFH will ensure the maximum flow/pressure to the turbo. The oil feed from the head is "lower" pressure as the supply is also addressing lifter and cam journal feeds, but feeding from the head can be good enough.
Maximum pressure is not always what you want. Non-journal bearing cartridges from other turbo manufactures (like ball bearing turbos) can be overrun with pressure from the OFH and push past the seals.
It is best to do what the turbo manufacturer says.
Note: ROYZGSX or Scott Grey’s 94 (way back in the day, trying to remember) burned up two 20G turbo during an event called "ultimate street car challenge" due to lack of oil from the OFH because an inline filter on the feed got clogged. This was not discovered until AFTER the 2nd turbo was killed in the heat of competition. This is one of the reasons I never run an inline filter, and always check for oil flow priming the pump when installing components.
Maximum pressure is not always what you want. Non-journal bearing cartridges from other turbo manufactures (like ball bearing turbos) can be overrun with pressure from the OFH and push past the seals.
It is best to do what the turbo manufacturer says.
Note: ROYZGSX or Scott Grey’s 94 (way back in the day, trying to remember) burned up two 20G turbo during an event called "ultimate street car challenge" due to lack of oil from the OFH because an inline filter on the feed got clogged. This was not discovered until AFTER the 2nd turbo was killed in the heat of competition. This is one of the reasons I never run an inline filter, and always check for oil flow priming the pump when installing components.
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