Another oil return line with headers question.

[911Ren20]

Hi all,

’79 911SC, engine is out of the car at the moment.

I recently picked up a Fabspeed header/heat/muffler setup and was expecting to need the earlier-style oil lines to clear the headers. While doing a mock-up on the engine stand to see how everything lines up, I noticed the primary tubes are not touching the stock oil return/crossover line at all - there’s good clearance.

Does this mean I’m in the clear to run these headers with the stock ’79 lines? I can’t fully check the fitment to the thermostat lines in the RR wheel well until the engine is back in the car, but based on the layout I don’t think it will be an issue.

Has anyone here run this Fabspeed setup with the factory SC lines and can confirm from experience whether clearance and heat are OK, or if you still ended up backdating the oil lines?

I hope I am not overlooking.

[Bill Verburg]

Originally Posted by 911Ren20

Hi all,

’79 911SC, engine is out of the car at the moment.

I recently picked up a Fabspeed header/heat/muffler setup and was expecting to need the earlier-style oil lines to clear the headers. While doing a mock-up on the engine stand to see how everything lines up, I noticed the primary tubes are not touching the stock oil return/crossover line at all - there’s good clearance.

Does this mean I’m in the clear to run these headers with the stock ’79 lines? I can’t fully check the fitment to the thermostat lines in the RR wheel well until the engine is back in the car, but based on the layout I don’t think it will be an issue.

Has anyone here run this Fabspeed setup with the factory SC lines and can confirm from experience whether clearance and heat are OK, or if you still ended up backdating the oil lines?

I hope I am not overlooking.

I can't remember the routing of the original lines on an SC, but the usual issue w/ Fabspeeds headers is the S hose from the tank to pump, It is very, very near the headers and needs to be protected or relocated.

[911Ren20]

Hi Bill, If it comes down to it. I will probably just replace the cross over metal lines and the rubber line to thermostat housing. when the engine is back on the car. Thanks for sharing your experience.

[Rivet]

When I purchased my 78 the previous owner had installed a full Fabspeed RSR exhaust and had managed to keep the stock oil lines although they did make contact. It was not the cleanest install with them and I wouldn't recommend keeping it that way, but it will work in a pinch.

And as Bill said, the S hose will burn to a crisp if not addressed. I had to modify my hose a bit and then I installed a silicon heat sleeve over the S hose and a heat shield on both headers as well to protect my now dual plug lower coil on plug.

https://ppepower.com/products/heat-sleeves-silicone-coated-fiberglass?srsltid=AfmBOopIsNSAdFW_ikMsylfxH773gIz awZau8FDJO9ANnioSA1t3bScX

https://www.designengineering.com/titanium-pipe-shield-6-x-24/

[RarlyL8]

Fabspeed should answer that question for you.

Every conversation I have with folks looking for a tuned exhaust system for their application will cover oil lines, heater hoses and any other possible item they may need to address when making this conversion. No surprises is the goal.
The FS design does not use the OE early Porshe locations or allow for the use of other mufflers. The passenger's side primaries sit right under the main oil tank line; that being your biggest concern. As for the OE hard oil lines, you would need to install the muffler to see where they may clash.
Here are pictures of the oil line types and where they run when using OE Porsche header and muffler locations.

Early G-body and 911SC This line is generally incompatible with headers.




3.2L Carrera This line can be moved up and out of the way of headers.





Back Dated Oil Line Set Optional for the 3.2L Carrera.




Hope this helps!



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