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TurboKraft TurboKraft is offline
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Join Date: Mar 2005
Location: Phoenix, AZ
Posts: 2,677
Uncle,

That's a hard one to figure out.

Capacity problem? Not likely, as Ruf used a tiny drain can under his K27 and "große K27" turbos, no issues. This size worked for years on B&B and other headers.

Ventilation? Again, these same drain cans were not ventilated.

Scavenge pump falling behind? You've done the normal test, checking flow vs. suction into a reservoir you can see into. I do recommend testing at idle, midrange, and higher revs as I've seen some fall behind at idle yet work at revs, and the other way around -- work at idle, fail at revs. Regardless, they're very durable a re-seal kit almost always resolves all scavenge pump issues.

Solutions we've found for this problem:
1) We upgrade the check valve mechanism at the turbocharger's oil source:
TurboKraft Inc : Turbocharger Oil Feed Check Valve [930 107 706 TK] - $52.00
2) Ventilate the drain can. Often all that's needed is a tiny weep hole atop the canister, even a 0.5mm hole is plenty.
If this causes oil mist to accumulate on the back of the car, route a hose from the breather up above teh engien sheetmetal, all the way to the airbox if you wish.

TurboKraft manufactures drain cans for Garrett GT-series turbochargers, and they have a provision for a vent *if* the installer wants to use it.
A lucky second function of this: should your pump fall behind, oil bleeds out the vent rather than bypass the turbocharger's seals and contaminate your muffler...
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TurboKraft, Inc.
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Old 10-11-2014, 07:55 AM
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