carx7

iTrader: (31)

I'm helping a buddy with a recent single turbo upgrade in his 94 FD. He purchased a used 62-1 from a friend of a friend so the seals are suspect, but I want to be sure I checked everything else.

When the car was first started after several months down for the install and some other trouble shooting ran began to pour thick blueish white smoke from tail pipe and around turbo.

The CHRA was clocked at a 45degree angle and has been corrected to a vertical position (oil drain down). He was using -6AN feed and drain, the -6 feed now has a restrictor described to me as "smaller than a tooth pick" and I believe I remeber him saying .040in hole. The DP/exhaust was cleaned up and the car started. it still smokes nearly as badly.

I said the next thing is to get a -10AN drain line since I think that restrictor is sufficient. After that I don't know what to check other than to assume it is the seals in the turbo.

FWIW, there is very little shaft play, and zero oil from the compressor side of things or in the IC piping. Anything else I"ve missed?

-Chris

sub-zero

Is the crank case vented? It will cause it to pressure up and the oil will not be able to return. Also a 6 AN feed is large and You should always use a larger drain and should be 10 AN. Watch You dont cook the turbo with that restictor.

carx7

iTrader: (31)

Crank case vent.... DUH! I need to double check that. Thanks.

I agree 6 is a large feed and not nearly enough for drain, he didn't know when he made the lines and is trying not to have to redo them, hence the resitrictor. Any idea what a good size restrictor is? I'll search since that's probably been stated.

I told him to get 10AN drain but we'll double check on the vent as well.

Thanks,
-Chris

carx7

iTrader: (31)

Think I just got my answer for anyone else who happens across this post:

Followed by:

Marcel Burkett

The crank case venting only becomes a real factor when the engine is under boost , at idle it does not matter , all the smoke could be residual oil in your exhaust sustem that has to be burned out , let it sit and idle for a while and see if the smoke stops.

setzep

-6 return is your problem. You can't have too big of a return line. having a -6 feed is not a problem if you are running a restristor like you said. After geting a larger return line you may find that you can put in a larger orifice with no problems.

andericus mack

You can grind the compression surface of the inlet
fitting[part going into turbo] flat. Then use a nitrous
jet and size- .050 or up to .070 range. For drain, got 3/4inch pipe fittings from a hose supply.They have over 1/2inch inside diameter. Teflon hose 3/4 inch again,
over 1/2 id. Block off throttle body-pvc valve nipple
and put a filter on the oil fill stalk. Then crnkcase can
breath as need be. I think 6an is way too small for
drain line. Also, some guys put line into oil pan. Hayes
told me they prefer the front cover,though-good luck.

andericus mack

I also retrofitted a valve cover breather cap to the
oil fill stalk and have no more stinky oil smell or
turbo smoke. The turbo seems very happy now