Hey everyone! Soon I will have to get some pics for you all and share more details regarding my 6 conversion, but for now I had some questions for my specific example.

I have a 1970 914, so it came with the 1.7 of course. I am working on putting in a 2.7l from a 1974 911. It originally had CIS, but I am opting to switch over to carbs. The engine is complete with its factory harness and I am wondering what I will need to buy or do in order to get the engine correctly hooked up to what it needs to. Either direct connection to main harness or using the relay board as a way in joining connections. From what I understand I won't need half the stuff on the engine harness, or relay board and also the pins are all different.

I am going with a 6AL box, carbs, high vol low pressure fuel pump. I would like to keep it as simple as possible or as cheap as possible, if you can have 1 with the other in this scenario. Please let me know what needs to be done! I tried searching around and found some stuff but nothing that really helped for my uses. Any links for business or guides would be appreciated, thank you!

I had the same setup in my Irish 6, with a CIS 2.7. I can send you photos etc.. of what the plug from the engine harness needs to be setup for the relay board. It is pretty simple actually. Some wires remain in place (the yellow starter solenoid etc..).

You can also use a more modern alternator with an internal voltage regulator and eliminate the exterior regulator on the relay board. Very simple to do. I have photos, diagrams etc.. and can essentially walk you through that.

I have weber triples, but was even running a Holley Sniper at one point. I had an MSD 6AL box, but find that running a 1,2,3 ignition is all it needs as the MSD seems to eat up the rotors... you need a rotor without the resistor to make it work well.

Other than that, it is pretty bullet proof.

Rob

Perry makes a harness for exactly what your doing

PM sent. I'm in the midst of the exact same project, albeit with a 3.0 liter. As Ben says, Perry will build you exactly what you need.
I can't say enough kind things about him.

Maybe we can get a group buy I still need to get one made for the same type of engine swap.

I found a used one, cheap and did a few mods, worked perfect. They are quite simple

Good call with the 6AL box

Are you running an alternator with a built in regulator?

Perry is the guy. He will build the harness just for what you have and explain it well with a schematic to match. Plug and play, cars running great five years now. Best, MarkClick to view attachment Click to view attachment

My six came with a loom but all chopped up ,went via Timmy2 on Pelican then he mentioned not really his thing as his pinout board wasn't set up to reman a replacement , Perry built me a great loom to my spec and no regrets however not sure he is doing them currently so worth checking with him about that.
Cheers.

Thanks for all the guidance everyone! Its got an externally regulated alternator... I assume. Never pulled anything to 2x check that. I guess I should. Do I just remove the shroud and check? I would put money that its externally regulated. I shot Perry an email the other day and someone messaged me his number. I'll give him a few days to respond, otherwise will give him a call.

I would be interested! I am more or less ready to pull the trigger once I hear back. I can reference to Perry that you would be interested and see if he is wanting to do that.

Works for me.

I'll be in the same boat here when my '71 comes back from its spa treatment. What is perry's screen name or contact info?

TIA.

Ironhillsrestoration

I’m at this stage of my 3.0 project as well ( I wonder how many 914-6 conversions are out there). The only engine harness decision I still have to make is whether to retain the relay board. The only reason I would want to keep it is for the fuel pump 5 second shut off feature. I believe it is controlled at the rb but I could be wrong. Does anyone know how that works and if a relay could be set up closer to the fuel tank where I’m moving the fuel pump?

Similar boat here, I'd like to skip the board to clean up that area of the engine bay, guess I'm forced to go internally regulated alternator...? Since I'm going carbs that's the only thing holding me back from cutting it out completely.

Not a bad idea to go with a new alternator anyways if yours has some age on it. Mine was last rebuilt in 1995! So I paid the price and bought one from Pelican.

Thats what i did, got rid of the board, newer alternator with internal reg. The old was 55 amps to 70 amps with regulator. It is a little longer so I had to have 9mm milled off inside of early fan housing, not a big deal for my machine shop. Mark

Just to clarify you can run an external regulator alternator you just have to find a spot to mount it. The relay board gets in the way of everything as far as I am concerned

I completed my /6 conversion earlier this year, but are they ever completed?

Used a new alternator with internal regulator a few bits from an original /6 engine harness and fabricated the rest, Super easy

retained the regulator board for simplicity

What's the current go-to for alternator. I have an old one currently, but my engine is being built, so now's the time to swap. Future-proofing for more power needs is a good idea too...

Note; Changing Alternators, sometimes requires a different depth Fan housing

“Note; Changing Alternators, sometimes requires a different depth Fan housing”

Did Porsche go to a deeper fan housing when the regulator changed or are you talking about higher amp alternators that are just bigger? As mentioned by a previous poster.

Yes. You can’t just drop a late alternator into an early fan housing.

And for some reason you have a later fan housing and an early alternator they sell a 9mm spacer to make it all work. Best, Mark

I removed the relay board in my brothers 6 conversion and installed an internal voltage reg alternator. It was super easy to do. I used an engine wire harness kit from Perry and a male 14 pin harness plug to make it all work. Here's the alt info. It's a new Valeo unit.
75 amp, internal reg, part # 432776 or 911 603 120 04. Some minor modifications are required on the rear alt air guide. There's plenty of online info on this mod. The factory even put out a bulletin on how to do it.

Circling back here, I got ahold of Perry and he is going to be making a harness for me. I ordered a IR alternator and will swap it in once I get it, hopefully I do not have issues with getting it to fit. Thanks everyone!

Looking forward to another conversion on the road. Good luck.

I’m here to help anyone with their 6 conversion engine harness, or original 914-6.

Please feel free to message me.

PK

I would love to see a walk through of how to eliminate the relay board. I would call myself "wiring challenged" but can do the basics. I am very intimidated by the thought but would love to get it out of there and eliminate it. My car has the defroster on the rear window, so something extra there....

I considered eliminating the relay board, but in the end I kept it for simplicity sake.

Actually removed the mounting tabs and welded them back on

If you want to keep your rear defroster, it’s going to be best to keep the engine relay board, as that’s where the defroster relay is located.

The main considerations for eliminating the engine relay board are: how are you powering your fuel pump, is your alternator externally regulated, and is stock/original appearance important. Most people relocate their fuel pump to the front and power it from the front fuse panel. If you have an internally regulated alternator then you don’t need the voltage regulator on the board, but I can make a harness to mount the regulator in a different location. Removing the relay board makes oil filter changes much easier as well as making your engine bay visually cleaner.