Running a Garret Turbo to a 3800 engine and have to much oil pressure at the turbo, getting some oil bypass thru the seal , even with a restrictor...any ideas ?
I have a stronger spring for oil pressure and its just to much. Turbo is clocked so the feed goes down and out the bottom. Thinking of going external oil and scavange pump.
I have a stronger spring for oil pressure and its just to much. Turbo is clocked so the feed goes down and out the bottom. Thinking of going external oil and scavange pump.
I still recommend checking that your drain is perfectly vertical or as vertical as possible. If it's a journal bearing turbo pressure shouldn't be a problem. Turbochargers have built in resctritors. I've ran over 120psi of oil pressure through a turbo before and had absolutely no problems.
so either it's the drain or it's the exhaust ring seal or compressor ring seal
I agree with the first ones. If all the other check out then make a orifice. Carb jets are easy to get and change. Start out with a large size jet. Run it and if it smokes then go down a few sizes until it no longer smokes. I run thick synthetic it won't choke the turbo like reg oil will.
Originally posted by Bozzie: I have a stronger spring for oil pressure and its just to much. Turbo is clocked so the feed goes down and out the bottom. Thinking of going external oil and scavange pump.
Don't complicate matters unnecessarily, put the stock spring back in the pump and if that doesn't cure it and the turbo is used it may need a rebuild. The greater the bearing tolerances in the turbo the faster the oil flows through the bearing and the greater the risk of out flowing a perfectly good drain system. If you decide to increase the restriction further going into the turbo, disconnect the drain tube from the pan and let it drain into a container for a cycle of a few seconds to get an idea of how much oil is actually being pumped through it afterwards. There is a standard for how much the flow quantity should be on the net.
I always ran synthetic oil with my turbo engine. I think its pretty much a necessity to overcome heat. When I first built it I was using regular oil and it would burn about 1/2 quart every few thousand miles. Just going to Castrol Syntec changed that to less than 1/2 quart in 7,000+ miles. And...im pretty sure all that was thru valve guides since it got a whisp of smoke at startup.
Originally posted by rogergarrison: I always ran synthetic oil with my turbo engine. I think its pretty much a necessity to overcome heat. When I first built it I was using regular oil and it would burn about 1/2 quart every few thousand miles. Just going to Castrol Syntec changed that to less than 1/2 quart in 7,000+ miles. And...im pretty sure all that was thru valve guides since it got a whisp of smoke at startup.
Make that synthetic and an oil cooler, I believe the best oil cooler on the market is a stock water cooled unit mounted between the oil filter and the mount. I ran a temp gauge immediately after installing mine and the oil only ran a little hotter than coolant temps at stop lights, other than that it was cooler than the coolant because the water feed to the cooler is from the side of the engine block before it gets to the cylinder head where it picks up most of its heat. Without it my oil temps ran approximately 240 deg +/- during the Summer with moderate driving.
I second the oil cooler. My oil temps would go high and pressure would drop.
It sounds like your seals in the turbo are bad. But, as mentioned check your oil drain. I remember my putting the drain plug in the pan and trying to mount it as high as I could.
