Turbo oil restrictor size
#1
Nordschleife Master
Thread Starter
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I was just wanting to learn a little about oil restrictors for non triple K turbos. What are the typical sizes you guys use for Turbonetics type turbos? I have a Turbonetics 60-1 HiFi that was used with a 1/16'' (.0625) restrictor. I read threads that confirm this size, but still left me wondering. I undestand the 951 engine has higher oil pressure necessitate this, but to go from practically 1/4'' down to 1/16'' seems pretty drastic? Im not really questioning it because it worked fine previously, but i guess im just amazed you would really need to reduce the feed orifice that much!
#2
Rennlist Member
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i dont have an answer but i do know that Sam Grant's car had this issue- the turbo would basically injest oil that was pushing past the seals due to the overpressure from the stock system.
#3
Race Director
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Yeah my new turbo was smoking a bit, installed a plug with a 1/16" restrictor and the situation improved drastically...was dreading the thought of pulling it for a rebuild so I tried the restrictor first - 1500 miles later and a few trackdays/dyno runs Im having no issues.
#4
Nordschleife Master
Thread Starter
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Thanks for the input you two. I was just curious, it seems awfully small of a hole. I did some more reading on the subject and read a few things specifically on the Garrett webpage that most journal bearing turbos only need about 30psi of oil pressure to lubricate properly. Interesting stuff.
#5
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I've always wondered about taking the oil from the head and perhaps it would be at lower pressure or a restriction would perhaps be more effective as it is further down the supply chain .
601, 930, engine, feed, head, low, oil, overpressure, porsche, pressure, rebuild, restrictor, restrictors, size, turbo, turbocharger