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one of the great unwashed
 
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Join Date: Apr 2004
Location: Ringwood, NJ
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Quote:
Originally posted by RarlyL8
Pat - if that is the problem you are having you need an oil sump like those used on the stock 930. They have a vent that attaches to the air cleaner. On my car I just put a small filter on it. Do not "T" your line, it will hydro lock and with enough pressure shoot up the "T". You need an actual catch can or tank that has open atmosphere at the top. Once that is taken care of you have to clear the path for the oil. If the engine sump is pressurised it will not allow the oil in.
Brian,
As I found out at 0545 this morning, you are exactly correct; it will hydro lock and push the oil back up the vent tube. So, although it was OK for a while the past few days, I tried to use the car to go to work this morning. I didn't get a mile from home. When I got back in the garage, it had shot oil everywhere, and onto the heat exchangers. Nothing like having to take a fire extinguisher to the underside of the car at 0600.

I think part of the problem is that the tee was at the level of oil in the sump. I'll try builing a catch can today at work. I looked at some commercially available cans, and they seem to be a bit too deep for my application.

Pat
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Patrick E. Keefe
78 SC
01 Boxster
Old 07-20-2007, 03:17 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #101 (permalink)
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Join Date: Jan 2003
Location: Burlington, Wisconsin
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Quote:
Originally posted by built4sound
Well now that I am on the verge of starting my turbo project over, I'm just curious where you came up with the part of your crossover pipe below the turbo. It looks premade.
thats part of the kit we buy from ssi and then finsh the assembly for a bolt on solution
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Ben

Current project 73 914-6 Gt project rusteration 2.4
Reproduction 914-6 oil tanks, 1-5/8" 914-6 heat exchangers source call 2623647426 or email mbconsulting21 @gmail.com
Old 07-20-2007, 04:28 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #102 (permalink)
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Join Date: Jan 2003
Location: Burlington, Wisconsin
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Quote:
Originally posted by patkeefe
Brian,
As I found out at 0545 this morning, you are exactly correct; it will hydro lock and push the oil back up the vent tube. So, although it was OK for a while the past few days, I tried to use the car to go to work this morning. I didn't get a mile from home. When I got back in the garage, it had shot oil everywhere, and onto the heat exchangers. Nothing like having to take a fire extinguisher to the underside of the car at 0600.

I think part of the problem is that the tee was at the level of oil in the sump. I'll try builing a catch can today at work. I looked at some commercially available cans, and they seem to be a bit too deep for my application.

Pat
did you get the new muffler??? just curious
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Ben

Current project 73 914-6 Gt project rusteration 2.4
Reproduction 914-6 oil tanks, 1-5/8" 914-6 heat exchangers source call 2623647426 or email mbconsulting21 @gmail.com
Old 07-20-2007, 04:30 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #103 (permalink)
one of the great unwashed
 
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Ben:
Just got it yesterday. I'll give you a call.
Pat
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Patrick E. Keefe
78 SC
01 Boxster
Old 07-20-2007, 04:46 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #104 (permalink)
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Ben,

Ck for PM...

Thanks
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RGruppe #180
So many cars..so little time!!
Old 07-20-2007, 07:40 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #105 (permalink)
one of the great unwashed
 
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I will guess this is the basic premise of a catch can?
In at the top, out at the bottom, vent line on the very top.

Pat


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Patrick E. Keefe
78 SC
01 Boxster
Old 07-20-2007, 11:46 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #106 (permalink)
 
one of the great unwashed
 
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Well, after surveying the mess and cleaning the garage floor, I think I should break down and put the electric oil pump in
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Patrick E. Keefe
78 SC
01 Boxster
Old 07-20-2007, 03:27 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #107 (permalink)
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Garage
Catch can looks good!
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 07-20-2007, 04:39 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #108 (permalink)
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I can get the can in OK IF (big IF) I can come off of the turbo drain with a 45 or 90 elbow, and go back into the sump like I have it. Mounting the pump wil be a PITA, and I'm not sure it will fix the problem. I think the can in conjunction with the electric pump will be the answer.

BTW, the can is a real short piece of 2" Type L copper, with two caps, and the fittings brazed in. I'll have to cut the long copper tube pretty short to make this work.

Tomorrow is another day....and, I refilled all of my fire extinguishers today.
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Patrick E. Keefe
78 SC
01 Boxster
Old 07-20-2007, 05:19 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #109 (permalink)
one of the great unwashed
 
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Well, I measured everything up this morning as far as verical drain distances. The exit at the turbo is 2-1/2" higher than the bottom of the oil return tubes. I would guess the actual level of oil in the sump is somewhere between the bottom of these return tubes, and the sump plate. My best guess is that the oil level in the sump is just about 1" below the turbo drain flange. In theory, I have enough room to put the can in, but I can't make the connection at the drain fitting, because the mount flange of the turbo is in the way, and I can't get the 3/8" bolts in. I've already builty two different iterations of the drain flange today, just won't work.

So, I figured I can get the pump in the left fenderwell, and I'll get 1" pitch to the pump inlet in 15 horizontal inches. I could get more, but I'd have to route the oil drain line under the exhaust pipe, instead of over. That becomes a risk-versus-reward decision. From the pump, I can put a bulkhead fitting in the oil tank..which was the original question when I started this post.

Live and learn.
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Patrick E. Keefe
78 SC
01 Boxster
Old 07-21-2007, 06:46 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #110 (permalink)
one of the great unwashed
 
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Being extremely hard headed in not wanting to run an electric pump, I rebuilt the catch can and put it all in tonight. I'll get some pictures tomorrow. I left the option of putting in the pump if the case sump drain doesn't work out...two drain fittings on the catch can.

Does anyone know just how high the normal static oil level is in the sump? Maybe an inch above the pickup tube inlet?

I guess I'll have to figure out how to attach a picture.
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Patrick E. Keefe
78 SC
01 Boxster
Old 07-24-2007, 05:25 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #111 (permalink)
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Catch can going into the crankcase sump fixed it 90%. Still spit out some oil on hard boost. Since 90% wasn't a viable option, I broke down and put the pump in. Copper plumbing lines in the picture will be replaced by some sort of rubber connection to take the flex, as the pump is chassis mounted. The copper drain system is just plain ugly, but functional.

Other than the pump being terribly loud, it works pretty well. I just hate to rely on an electric pump rated at 265 degrees for my drain system. Maybe I'll go with a 930 setup over the winter.

Thanks to everyone for the help, especially rarlyl8, mb911 and Tim's Turbos. Now I can get the car sorted a bit better.




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Patrick E. Keefe
78 SC
01 Boxster
Old 07-29-2007, 09:57 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #112 (permalink)
 
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