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ke382TG
Forums Junkie

Registered:
May 2002

Re: 4agte turbo oil leak

Wed, 26 October 2005 00:24

I was stuck at work last night for a bit so I did some online research on the above problems and questions raised in this thread:

1. The interesting thing I found was that nearly all the information on the turbos leaking/burning oil related back to honda turbo conversions and 4AGTE setups. One can assume that a lot of people aren't getting their homegrown turbo setup right Wink

The rest related to worn out turbos.

2. All information I found indicated that turbos DO NOT function on full engine oil pressure regardless of if they are ball bearing or plain bearing. A maximum of 25psi oil pressure for the turbo was widely coined.

3. The general consensus was that ball bearing turbos generally use a restrictor of 0.8mm and plain bearing turbos use a 1.0mm restrictor. This is what my local turbo supplier also stated and recommended that I run a 1mm restrictor on my plain bearing turbo.

4. Oil drains appeared to be the most common problem amongst the DIY turbo setups.

Quote:

I agree that using a restrictor is necessary on ball bearing turbos but on plain bearing turbos they require full oil to bath the bearing and provide an oil film to ride the bearing on. I think that full oil pressure will force the rear seal to seal properly with pressure applied from one side.

This is contrary to all the information I found with regards to plain bearing turbos. The statement you made about full oil pressure will seat the seals is flawed also as an increase in oil pressure in the turbo core is created by poor drainage and everyone knows this has devastating effects, thus how could an increase in oil pressure over the recommended pressure be good?

Have a look at a cut away of a turbo and have a think about how the oil passes through the core and how the seals work. You will see that the seals (rings) will suffer from increased friction and premature wear if they are exposed to excessive oil pressure.

If you want to check up on anything I wrote above do some research or flick an email to one of our local turbo suppliers Wink

If the 4AGTE was able to have the oil drain flow into the block i.e. well above the oil level in the sump I think we would be seeing a lot less problems about 4AGTE turbo oil leaks/smoke Very Happy

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