Garrett dual-ball bearing turbos & oil pressures
10-27-2004, 11:07 AM
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Garrett dual-ball bearing turbos & oil pressures
from http://agpturbo.com/customer/home.php?cat=67
"<i>All of the GT series turbos utilize a water cooled bearing housing. A constant supply of water must be plumbed to the 14mmx1.5 threaded holes front and rear. The oil inlet on the top of the bearing housing is a 7/16-24 inverted flare. <b>This must be supplied with a constant flow of CLEAN oil at pressures no greater than 60psi</b>. And the oil drain is a two bolt flange with 8mm1.25 threaded holes. This flange is the same spacing and configuration as the standard Mitsubishi oil drain found on TD05 and TD06 bearing housings.</i>"
Now, I'm certainly not a mechanical wiz or anything, but I'm pretty sure that my car sees up to 5 BAR of oil pressure.. particularly prior to warming up. That's over 73 PSI, if my math is correct. I don't think its normal operating pressure is that high, but the fact remains -- there are occasions when the oil pressure far exceeds 60 PSI. Should this be a concern for any of those individuals who are considering installing these Garrett dual-ball bearing units?
"<i>All of the GT series turbos utilize a water cooled bearing housing. A constant supply of water must be plumbed to the 14mmx1.5 threaded holes front and rear. The oil inlet on the top of the bearing housing is a 7/16-24 inverted flare. <b>This must be supplied with a constant flow of CLEAN oil at pressures no greater than 60psi</b>. And the oil drain is a two bolt flange with 8mm1.25 threaded holes. This flange is the same spacing and configuration as the standard Mitsubishi oil drain found on TD05 and TD06 bearing housings.</i>"
Now, I'm certainly not a mechanical wiz or anything, but I'm pretty sure that my car sees up to 5 BAR of oil pressure.. particularly prior to warming up. That's over 73 PSI, if my math is correct. I don't think its normal operating pressure is that high, but the fact remains -- there are occasions when the oil pressure far exceeds 60 PSI. Should this be a concern for any of those individuals who are considering installing these Garrett dual-ball bearing units?
10-27-2004, 11:50 AM
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use a restrictor
ATPturbo.com sells the 7/16 IF fitting for these turbos with a .035 (small) orifice built into it. The small oil passage regulates the amount of oil that reaches the bearing set. I am currently building a stainless exhaust manifold, gt30bb turbo and 4" turbo back exhaust system where i will use this ATP fitting.
10-27-2004, 02:31 PM
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Re: use a restrictor
but cutting down the exit ID of the oil will only increase pressure to its peak value, right?! i mean its not a matter of HOW much oil .. but at what pressure the oil is entering the bearings. i'm speculating here ... so feel free to prove me wrong but physics tells me otherwise.
10-29-2004, 05:06 AM
#4
If you look inside the oil receptacle...
You'll see a restrictor already in there. You do need a special adaptor fitting that goes over that restrictor and matches the threads of the housing. At least that's the way it is on my GT35R and Dave Dawson's GT30R. We got our turbos and all the required fittings at Turbo Engineering in Golden CO. Its pretty cool living in Evahboost with a mega-turbo distributor/shop 15 minutes down the road in Golden.
Hap talkin dahkine blowmohs in Evahboost
Hap talkin dahkine blowmohs in Evahboost
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