930 running in

[camelotr]

Hi Guys,

i just built my first Porsche engine, a 930. Complete build, with new cylinders, bearings etc.
I just started it up on an engine stand to look for oil leaks.
Generally its all fine. Engine responsive, no ill noises etc. BUT it has some oil smoke, which I assume normal at this stage.
I am a bitt puzzled though on the best running in method. The Porsche is big bore, with a rather smooth honed nicasil cylinder. What is the bset method to make an oil tight engine? Please reason Your opinion if possible.

Thanks in advance!

[stevieturbo]

I would just use it fairly normally....and not laze about.

Rings need cylinder pressure to help them push against the bore and seal, so give it some.

[ssray]

No high gear low rpm lugging type stuff, use the mid-range and try and vary the throttle openings quite a bit, I could do it for you? no really i don`t mind

[FordPrefect56]

Hello grasshopper. Glad to see you still alive. New screen name for reasons I won't go into on here. No, smoke is not normal even before running in. Nikasil is a can of worms. If the bores are not good there's not much you can do about it now.

Edited by FordPrefect56 on Sunday 29th May 07:18

[camelotr]

FordPrefect56 said:

Hello grasshopper. Glad to see you still alive. New screen name for reasons I won't go into on here. No smoke is not normal even before running in. Nikasil is a can of worms. If the bores are not good there's not much you can do about it now.

After setting the K-jet the oil smoke disappeared. The bores/pistons are brand new (original Mahle). Piston.bore clearances checked - at factory give tolerances.

[camelotr]

FordPrefect56 said:

Hello grasshopper. Glad to see you still alive. New screen name for reasons I won't go into on here. No smoke is not normal even before running in. Nikasil is a can of worms. If the bores are not good there's not much you can do about it now.

I was thinking if the alusil need any special method of running in (?)

[FordPrefect56]

You going to make your mind up whether it's Nikasil or Alusil?

[camelotr]

FordPrefect56 said:

You going to make your mind up whether it's Nikasil or Alusil?

As You see, it was a bit late at night yesterday. And of course it is nikasil.

[FordPrefect56]

My normal running in rules apply. The piston rings should have removed the nickel layer within a few hundred miles and by then it should be good for full beans and no mollycoddling.

https://web.archive.org/web/20110903073123/http://...

Anyway I'm sure Porsche have been building these for long enough to have a pretty tried and trusted set of running in rules whatever those are.