924Board.org

Woodsy · Joined: 16 Nov 2005 Posts: 2

1st let me say - NICE BOARD!! Its always great to see folks who share common interests willing to help others! Thanks!
I build chops (bikes) for a living and went to pick up a 650 Yam motor a kid had for sale. Saw this Porsche in his yard and it followed me home.
Kid knew NOTHING about it other then he got from original owner who stopped driving it, supposedly, when the clutch went. It is 1980 924 Turbo, has checkered flag interior, 73K miles. It does NOT have rear disc brakes..
I realise that a FORTUNE could be spent getting her going again so I am trying to see what I have little by little, without spending $$ on ANYTHING till I know what I have..
Raised it up, rapped on starter and got engine to roll fine. Spark looks good at plugs. Both fuel pumps are STUCK, I put 12V to then and NOTHING!! Got info from here on pump relay, pulled it, seems to be functioning properly (contacts make with power).
What I would like to do next is put fuel DIRECTLY to the device at the front of the car where the injector lines all meet. There are two lines feeding this device that are fuel lines from the tank. I am planning to disconnect the two service banjos from the this device and hook up a set connected to a fuel pump being fed by a seperate tank..
Does anyone know about how much fuel pressure I should put on the feed device (what is this thing called?) to get it to function properly, also does it have to be exact??
All this being done to see if the Engine is worthy BEFORE I invest $ into pumps, clutch work ect...
Think I am on the right track?
Thanks for the help guys!!!!!
Woodsy
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Play Hard, Ride hard, Love Gently

Lizard · Posted: Wed Nov 16, 2005 4:23 pm Post subject:

first thing to do is to replace the timing belt, if that belt breaks kiss your valves goodbye,

as per the fuel pressure it requires higher than most,
get a VW rabbit (gas) fuel pump from a wrecker and splice that in, take out the in tank one and gut it, as well drain all the gas in the tank and flush the tank out.
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3 928s,

Woodsy · Joined: 16 Nov 2005 Posts: 2

Lizard:
Is the Rabbit pump sufficent to replace both pumps that are there now? So I would be running off one pump instead of two? Souinds like a great idea if so!!!
ANy particular year(s) of Rabbit for doing this?
Thanks again!Woodsy
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Play Hard, Ride hard, Love Gently

numbbers · Posted: Thu Nov 17, 2005 10:49 am Post subject:

Well, you are on the right track. But, I don't agree with Lizard on this. (No offense my Canadian friend.) You will just be adding to your problem(s) by trying to use a VW fuel pump on a turbo. If Porsche could have gotten by with a Rabbit fuel pump, they would have done it. The fuel pressure required is about 50 PSI.

My first step would to spray a little starting fluid (ether) into the fuel injection plenum while cranking. If it trys to start, good.

You will find that both pumps are expensive for your Porsche, and a bit of a pain to change. But, you will find that the factory clutch is very expensive, and a real PITA to change. I know, I did my '80 last year. I recommend going with the Ford disk, very cheap, and works just fine.

These cars are not cheap to maintain, but they are a very fun ride.
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1980 924 Turbo