IM looking for any old threads on this subject - no luck. Anyone help out in locating any? Burning oil, indications are - its to much oil at the Turbo under vacuum and its getting sucked in thru the Turbo or a possible problem with the return line not flowing away cleanly.. Larry
oil restrictor at turbo feed
- Thread starter Larry
- Start date
What do you have for breathers/pcv? Too much crank case pressure can cause insufficient drainage for the turbo.
You shouldn't need to run a restrictor, a few guys have, and some of the turbo V8 guys do, but they also carry more oil psi than most buicks.
You shouldn't need to run a restrictor, a few guys have, and some of the turbo V8 guys do, but they also carry more oil psi than most buicks.
Corky Bell's book talks about oiling a little bit.
1. He says that too much oil pressure can create problems, and that it is possible to force oil past perfectly good seals if the pressure at the turbo exceeds 65-70 psi.
2. symptoms of oil getting past the seals would be frequent but not quite constant smoking. Solution is to add a restrictor or bypass to the oil feed line.
3. Restrictor: a 0.055-0.065" orifice in the turbo oil feed line. He recommends installing a pressure gauge downstream of the restrictor to prove there is adequate pressure at the turbo.
4. Bypass - tee at the point where oil goes into the turbo, one end of the tee goes into the turbo, the other end goes back to the engine (into the pan I would presume). Bypass line back to the engine gets a restrictor in it so it doesn't starve the turbo completely, just diverts some oil away from it.
5. Actual oiling requirements (for almost all turbos he says): at hot idle the turbo needs 5 psi and 0.1 gpm. At maximum load it needs 25 psi and 0.5 gpm.
1. He says that too much oil pressure can create problems, and that it is possible to force oil past perfectly good seals if the pressure at the turbo exceeds 65-70 psi.
2. symptoms of oil getting past the seals would be frequent but not quite constant smoking. Solution is to add a restrictor or bypass to the oil feed line.
3. Restrictor: a 0.055-0.065" orifice in the turbo oil feed line. He recommends installing a pressure gauge downstream of the restrictor to prove there is adequate pressure at the turbo.
4. Bypass - tee at the point where oil goes into the turbo, one end of the tee goes into the turbo, the other end goes back to the engine (into the pan I would presume). Bypass line back to the engine gets a restrictor in it so it doesn't starve the turbo completely, just diverts some oil away from it.
5. Actual oiling requirements (for almost all turbos he says): at hot idle the turbo needs 5 psi and 0.1 gpm. At maximum load it needs 25 psi and 0.5 gpm.
salvageV6
Daily Driver
- Joined
- May 25, 2001
Check with Innovative or Turbonetics turbos sites for the restrictors I believe they both carry them.
All the new Innovatives have the restriction built in.
The pressure will go up a bit 20-40psi., at the turbo when the restrictor is in place.
That bypass T sounds interesting.
All the new Innovatives have the restriction built in.
The pressure will go up a bit 20-40psi., at the turbo when the restrictor is in place.
That bypass T sounds interesting.
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