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Location: Daytona Beach, FL
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Just got 79 SC with 930 motor.. I think!

Hello all.. New to the 911 scene and couldnt be happier to finally have one.. I just got a 79 sc from my buddy that was in business with one of the best Porsche builders here in Florida.. The car has sat in his shop for about 15 years.. I thought it had a 3.0 with a turbo just added, but now I have checked the engine codes and I see these numbers 6590357 and 930/06.. I believe that means it is a 930 motor, is this correct? Now I am excited.. It doesnt seem to be running like a turbo at this point.. Its quick, but not like it should be.. I will post some pics if I am able to get some help on here.. Thanks for reading my novel, I am glad to be part of the group.

Old 11-11-2010, 02:29 PM
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Originally Posted by superterc7622 View Post
now I have checked the engine codes and I see these numbers 6590357 and 930/06..I believe that means it is a 930 motor, is this correct? Now I am excited.. It doesnt seem to be running like a turbo at this point..
930/06 is an SC motor.

6 = 6 cylinder
5 = 911 SC - California
9 = 1979

0357 is the production #.

At least you know why it's not running like a turbo... That should be good news.
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'77 S with '78 930 power and a few other things.

Last edited by spuggy; 11-11-2010 at 03:15 PM.. Reason: fix quotes.
Old 11-11-2010, 03:14 PM
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Its def has a turbo in it. I am so confused..
Old 11-11-2010, 03:32 PM
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Well, it is definitely not an SC induction system.
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Old 11-11-2010, 03:49 PM
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Looks like a SC 3.0l motor with 930 fuel distributor, IC, manifold?
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Old 11-11-2010, 03:51 PM
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Yeah, its nuts.. Jay is a freak.. I am going to send a pic of the head, it looks strange as well.. Any help is appreciated..
Old 11-11-2010, 03:53 PM
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Not sure if I should take all this turbo stuff off, or take it to someone and see if they can figure out this madness.
Old 11-11-2010, 03:57 PM
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I wouldn't be too quick to remove things. That is a 930 CIS. The top of the aftermarket triangle filter is missing. The 930 and SC distributors are interchangeable so you may have one of those as well.
It all looks neglected so I would not expect it to run well. I would go through it, see what you have, clean it up and see how she goes.
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Old 11-11-2010, 04:29 PM
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You might wanna put a filter on it. I don't know what the turbo would think of sucking in them leaves I see on the IC.

Don't take it off. Make it run. I bet it'll be fun.

Jesper
Old 11-11-2010, 04:29 PM
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Dose it have a scavenging pump? Where or how dose the turbo drain?


Looks like something someone built then which is not the end of the world.

I wonder what pistons and compression it might have?

This will determine how much boost you might get away with.

Might check the compression and compare it to known turbo and SC values for a hint.
Old 11-11-2010, 04:30 PM
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Thanks guys. I will take the advice and try to find someone to take a look at it. I have put a filter on it since this pic.. It seems to leak a little fuel on the driveway after a run.. it seems that gas is leaking into cylinders, sometimes it wont start again till it sits for a few hours.. I hope it turns out to be pretty quick.. At highway speeds it seems pretty fast as it is now. Wonder if other people have done this to an SC motor?
Old 11-11-2010, 04:35 PM
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Don't run it in that condition as you risk many things, including fire.
Pull everything off the top of the engine and go through it cleaning and checking the function and for leaks. Compare what you have to 930 fuel system (CIS) diagrams. Get some gages on it and see what you have. Could be a very nice deal you stumled unto or at least one that could be made nice with a little work.
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Old 11-11-2010, 04:41 PM
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Dont know what a scavenging pump is, Im sorry.. I hear no turbo noise at all though.. I dont feel like it is kicking in. Its my first 911 so I have nothing to compare it to.. Had lots of other fast cars, but no 911s till now.. It does have a third small exhaust pipe that looks like it comes out of the turbo.
Old 11-11-2010, 04:42 PM
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Thanks Rarly8. Plan on taking it apart this weekend. I hope it will turn out to be a good runner. I traded this car for my Rolex Sub, so I feel like I stole it.., lol
Old 11-11-2010, 04:44 PM
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LOL. That really wasn't what I was expecting to see...
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'77 S with '78 930 power and a few other things.
Old 11-11-2010, 05:15 PM
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Look at the bottom of the turbo. There should be small tube out of the center section which is the oil drain line.

On a 930 that tube drains into a small vessel that hangs off the bottom of the turbo. From that vessel there is another tube that that goes to the left front of the motor and attaches to a pump that is driven off the end of the drivers side cam shaft. It then is pumped back to its own connection to the oil tank.

If you have such a set up someone went to a lot of trouble to build up a turbo on an SC case.

If the drain out of the turbo is plumbed to drain directly into the chain cover or into the bottom of case where the oil drain plug is, it is probably an SC with the turbo intake and exhaust bolted on.

And or you can check the compression. I forget but I think with turbo pistons your compression would be around 135psi. On an SC it might be around 160psi or such. Anyway if you posted your results someone her could probably be able to tell.

Can you take a picture of the bottom of the turbo and post it?

Last edited by 911st; 11-11-2010 at 07:50 PM..
Old 11-11-2010, 07:48 PM
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Anyone know if the SC's had a red shroud?
Old 11-11-2010, 07:57 PM
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Sitting for 15 years...good Lord...it's going to be a VERY expensive and long winter.

Hate to tell you this, but I think your friend if he got a servicable Rolex Submariner may have gotten the better deal out of this.
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Old 11-11-2010, 09:30 PM
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Put some more photos up. I agree that it is likely an SC with a 930 induction system. The distributor looks a bit different than an SC. If we can see the bottom, we can figure out what you have.

I think SC's did have a red shroud...mine was.
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Old 11-12-2010, 04:36 AM
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Ill take some more engine pics here this morning.. This thing has to be worth more then my watch.. I only paid 5K for the watch and the Porsche is a beautiful masterpiece.

Old 11-12-2010, 06:17 AM
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