View Single Post
hoyabear hoyabear is offline
hoyabear's Avatar
Join Date: Feb 2008
Location: Seekonk, MA
Posts: 150
Send a message via Skype™ to hoyabear

You are probably talking about what is often referred to as the "drip tank." How much smoke is coming out of the exhaust? It is fairly common for these cars to give a puff or two of smoke upon startup and light smoke for a short while after. If this sounds like what you are seeing on your car, changing the drip tank probably won't make a difference.

On the other hand, if your car is smoking a considerable amount, only at startup or while cold, there could be other things going on. If the idle speed is very low when it is smoking (some of these cars idle very low when cold depending on WUR tuning), the issue may be that your turbo oil scavenge pump isn't being turned by the cams fast enough to evacuate the oil. The car needs to idle at 750RPM or higher to properly evacuate the oil.

An issue that would cause the car to smoke heavily upon startup and then clear up after running a short while would be if the BB was removed from the oil check valve. If this BB is removed, oil will continue to flow through the turbo and into the drip tank after the car is turned off, and as there would be no oil scavenging taking place at that point, the oil would settle in the drip tank and back up into the turbo, resulting in the vehicle smoking upon startup until all of the leftover oil has been scavenged out.
'86 930: 3.4 Andial build, Web GT2 Evo cams, Carrillo rods, ported/polished heads, MSD 6530, B&B headers/exh + intercooler, K27HF, 1 bar spring, Tial wastegate, Andial FE, Lindsey Fuchs. Back in black!!!
Past:997S cab; '88 930; '86 951; C5 Vette; 4th Gen Z28; 3rd Gen Trans Am GTA; '71 Z28
Old 11-09-2010, 07:22 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)