Help ROW '78 distributor setting
 

Like to check the timing on my distributor.
The vac pot doesn't work anymore (again!!)

can someone tell me what setting I need at 4000 rpm (vac disconected)?

I have a 30 mark? Most are 29°? No?
Have been searching threads.

I'm having 964 cams, WMI , muffler and headers

I need a safe setting. No need to gain more power here.

Thanks!

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Don't want to blow up piston rings and so on...
Just need little advice where to set the distributor @ 4000 rpm?

Do I set it on the 10 mark or the 30? (I got the flash light thing)

A lot of stuf to read for US cars but much less on the ROW ...

Thanks in advance!

I wanted to post sooner, but I cannot find my 930 manual :( This is from memory, I think it is 29 degrees at 4k vacuum disconnected.

Others should chime in to confirm.

Thats what I think to but my manual became corrupt.
I'm asking because then my distributor is one toot off ....
or vac mechanism is sticking? Need to check before setting up. Thanks

I always set them at 26°BTDC @ 4000RPM. If you live in a cool climate, use high octane fuel, or have a huge intercooler then higher is safe.

So without a boost retard working on this dizzy it would reach 26 degrees BTDC at 0.8bar potentially.

Just wanted to be sure you were considering this in the response.

I mostly here guys running less than 22 BTDC at 0.8bar from posts I been reading here on the board. But those numbers are all hard to come by.

Fred

There is no boost retard on a Euro distributor so yes 26° is what you see on boost.

Mine is 29 degrees at 4000 according to my manual , mine is a euro 3.0 though

But having upgrades on the engine will it change the (usual factory setting location??
because your engines dynamics have changed.

A question ive often thought about

I've got the manual back. The factory setting is indeed 29° at 4000
The vacuum pot works again and rotor advance also. Het to remove the rotor and drop in a bit op oil inside the shaft. I notice much more power at morning and evening as the temps are cooler.
Need to mount my bigger IC soon! First time my wife is happy with the Porsche, no oil leaks anymore :D
only issue I got right now is to rich between 4000 and 5000 rpm. Goes under 10!

Yes the spec is 29°, however Euro 930 engines ran on a different blended gasoline in 1978 Europe than they do today in the US which is why I set them at 26°. At that setting you can run without issue on 89 octane with 10% ethanol blend using stock boost with stock intercooler.

I use 100 RON Premium Octane,
what would be the ideal setting for this fuel?

Rob

Manual says 29 BTDC @ 4000 with 95 euro spec octane. so that is spec in 1977 so it most likely leaded. With this car I always run about 25% 112 leaded, blended with 75 % of 93 octane with a somewhat modded 1977 930 with around 400 crank Hp, 3.2 liter. 7,5 compression, Euro 934 distributor, twin plug and 1.0 bar of boost. Not sure of cam spec ( modded decades ago) but power is increasingly strong from 4000 to 7000. Turbos love leaded fuel. If your 100 octane is not leaded and you are not twin plugged and have above 7.5 compression and are running above .08 boost for extended runs, I would think 29 BTDC might be a bit much, as per Brian's opinion.
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