RegSpec Cruise Control 1,417 Member For: 18y 15d Gender: Male Location: Macksville NSW. Posted 20/08/07 02:08 PM Share Posted 20/08/07 02:08 PM As the title says, why is it that a lot of turbos have supply lines that are only about 3-5 mm ID.( Ive even seen some with restrictors sleeved down to about 2 mmID.) and yet the drainback tubes all seem to be in the 14-19mm area. Whilst I realise that a ball bearing turbo really only needs a steady stream(not bucketloads) why does the drainback have to be so big? Link to comment Share on other sites More sharing options...
TURBO4LT Member 1,533 Member For: 21y 4m 25d Gender: Male Location: NSW Posted 20/08/07 09:45 PM Share Posted 20/08/07 09:45 PM The oil returning from the turbo comes out pretty stirred up and aerated after being through the brgs and it is gravity fed to the sump so it needs a large return to stop it building up and blowing past the seals. The oil feed comes in at high pressure from the oil pump. Link to comment Share on other sites More sharing options...
RegSpec Cruise Control 1,417 Member For: 18y 15d Gender: Male Location: Macksville NSW. Posted 21/08/07 11:32 AM Author Share Posted 21/08/07 11:32 AM Thanks mate. Link to comment Share on other sites More sharing options...
thomasmurray1 Member 26 Member For: 17y 4m 28d Gender: Male Location: Melbourne Posted 30/08/07 12:13 PM Share Posted 30/08/07 12:13 PM as what others have said if the oil cant get away your in trouble as it can burn and cause damage to the bearings etc, also you really want the oil to get back as fast as u can due to lots of oil being pumped there at high rpm situations Link to comment Share on other sites More sharing options...
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