Running in required?

[fergus]

hello peeps

I've just had my 911 engine rebuilt after mis shifting and buzzing it (9600rpm - nice) - like a tw@t.

I've had 12 new valves, flat valve seat, Ti retainers, race spec springs, 12 new rocker arms, ARP big end bolts, new big end shells, ARP head studs, the crank x-rayed and checked for run out....

The question is, as I've not got new pistons/rings, etc, or had new main shells, do I really need to run the fecker in?

I've heard mixed opinions from various engine builders. Personally I can't see what there is to bed in, even after a few heat cycles. All torque settings should be OK.

Opinions please?

ta

[RazMan]

I would give the big end shells a couple of thousand miles to bed in, gradually increasing load over that time. Otherwise, just keep an ear out for any rattles in the valve gear but as long as it was nailed together properly .... no worries.

[Boosted Ls1]

I'd second the above comments. Be careful for a short while in case of leaks or mechanical errors etc. If it's fine after a couple of hundred miles build up the loads. Some people (not you) just have no mechanical sympathy. You need to get a feel for what's happening, does it feel free or tight. It's like maing love to a beautiful woman.. oops

[fergus]

cheers swiss!