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totle's Avatar
 
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Turbo oil feed check valve

See that I have no check valve function for the turbo oil line.
Bought a 9mm steel ball.

Should I install the ball or not?
Running a Garret Gt35R turbocharger.


Old 05-12-2013, 04:04 AM
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No no noooooo!

That is not the correct factory fitting on your elbow to be compatible with a ball. It appears that it will act as a check valve stopping oil from going TO your turbo.

Here is the factory fitting which has a slot across the end to allow oil to flow around the ball onwards to your turbo.

In your case leave the ball out.

Old 05-12-2013, 10:39 AM
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Darn, I thought the ball was to prevent backflow after the engine shut off, and that the oil pressure, with the engine running, just lifted the ball up to allow flow. I even heard on Pelican mention about a spring that was used.

Which is it??
Old 05-12-2013, 11:47 AM
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mine...

has a spring. I'm using a GT35R. I cant remember if it came with the turbo oil line or not. Phillip
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Old 05-12-2013, 12:40 PM
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Hi Jim.

I thought to slice a slot across the bottom of the elbow to prevent what you say.
Then it will never get stuck as you mention

Thanks for sharing the image
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Trond R.
1979 930: Garret GT35r turbo, EFI, carerra intake, Link EMS, custom GT2 cams, 98mm JE P/C, 964 crank (stroker), custom valves & ported (XtremeCylinderHeads) etc..etc..
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Old 05-12-2013, 01:15 PM
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Quote:
Originally Posted by totle View Post
Hi Jim.

I thought to slice a slot across the bottom of the elbow to prevent what you say.
Then it will never get stuck as you mention

Thanks for sharing the image
Do not only slice a little, make it as big as stock. Remember, when oil is under pressure, the ball will be liftet and pushed against the fitting. The oil has to flow beside the ball into the slot. If slot is too small, it will act as a restrictor
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Old 05-12-2013, 11:13 PM
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Thanks Roland, Will make sure of that
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Trond R.
1979 930: Garret GT35r turbo, EFI, carerra intake, Link EMS, custom GT2 cams, 98mm JE P/C, 964 crank (stroker), custom valves & ported (XtremeCylinderHeads) etc..etc..
1972 914-6 GT replica project
1986 944 Turbo
Old 05-12-2013, 11:42 PM
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Quote:
Originally Posted by baloo View Post
Darn, I thought the ball was to prevent backflow after the engine shut off, and that the oil pressure, with the engine running, just lifted the ball up to allow flow. I even heard on Pelican mention about a spring that was used.

Which is it??
What you describe is how the stock system works (although the spring is an aftermarket modification), but the original poster is asking about a non-stock setup that he has . . .
Old 05-13-2013, 08:03 AM
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The spring and modified hollow bolt is something we came up with at TurboKraft for problem 930s that smoke on startup, beyond the typical 911 startup puff of smoke. Quick bolt-in replacement, very effective.

Trond -- just get the correct factory hollow bolt and be done with it.
And if you want a complete oil line assembly for our GT35R, we have those in stock: hollow bolt with check valve, banjo fitting, oil line, GTR turbo restrictor.
TurboKraft Inc : Turbocharger Oil Feed Line Set : Garrett [930 CVS GTR TK] - $168.00
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Last edited by TurboKraft; 05-14-2013 at 08:13 PM.. Reason: addition
Old 05-14-2013, 08:12 PM
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Chris,
So your concept was to act as a check valve to shut off oil flow after the engine shut down... just for my own understanding.
As Ronnie states, the OP has a non-stock setup, which I don't understand the difference in concept.

HOWEVER, while the ball-valve subject is being aired, is this setup needed or useful with the old boat anchor 3LDZ turbo (float bearings, aka shell or flat bearings)?
Thanks.
Old 05-15-2013, 04:06 AM
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Nevermind my previous post from a few minutes ago. I went to TurboKraft website and saw the answer for 3LDZ (TurboKraft Inc : Turbocharger Oil Feed Line Set : 3K-Warner [930 CVS BWK TK] - $205.00 ).
Old 05-15-2013, 04:15 AM
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Quote:
Originally Posted by baloo View Post
HOWEVER, while the ball-valve subject is being aired, is this setup needed or useful with the old boat anchor 3LDZ turbo (float bearings, aka shell or flat bearings)?
Thanks.
Yes, we have found it useful on 3LDZ and K27 equipped 911 Turbos as some will have a huge puff of smoke on startup. If we remove the drain canister, start and immediately stop the engine, and inspect the oil flow out the turbo drain, it just goes on and on and on dripping oil.

We initially tried this in 2 cars in the shop, a tired ex-Ruf BTR with a K29 and a newly built one with a GT35R, both with a huge puff of oil smoke at startup. New check valves at the oil source, problem gone.

That was 5 years ago, both cars still going strong on their same turbos, confirming there's no risk to the turbo.
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Old 05-15-2013, 10:57 AM
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Quote:
Originally Posted by TurboKraft View Post
Yes, we have found it useful on 3LDZ and K27 equipped 911 Turbos as some will have a huge puff of smoke on startup.
Yep, Chris. Thanks. You do good work.

Old 05-15-2013, 01:24 PM
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