Running in - opinions pls.

[Lozza]

Running an engine on the bench for any length of time proves SFA, that's not under any sort of load. Any break-in proceedure must allow for the expansion of the piston and it is far better to do it in stages.I use 5min tootle around,5min up to 1/2 or 2/3 throttle then go for the doctor.No constant throttle.Wait untill your hand can touch the head in between runs.

[Rossvickicampbell]

usually use 1/2 hour runnign around a track which of course uses different throttle amoutns but nothing flat out.  Check all teh bolts in between pit stops??  Keep going until gut feel is happy and then start to open up and haven' had any problems.  Have also ehard of the fullt ank of fuel method etc.

 

Rossco

[Rosco400]

This got me thinking how I run the AW400 in last year after full engine rebuild at coffs classic dirt, 5 minute idle on warm up, two practise laps half throttle, oil change and rung its neck, hasnt missed a beat yet

[Stewart Allen]

Whilst my experience has been with automotive engines the principle is the same, get the rings to bite/bed into the bore (not glaze) without submitting bearings to full load, whilst minute bits & pieces are coming of/going through the bearings (in the oil). So once your happy its running OK statically runs with 3/4 - full throttle under moderate but short changing before it gets near 3/4 rpm's. Depending on depth of hone patten ring material & design you should have to rings bedded in in 15-30 mins, drop the oil & let her go.

This does not allow for jetting issues.

[holeshot buddy]

heres one for you set motor up dry kick kickstarter over about thirty times  run in

or start up get to operating temp cool right down
start up again ride for ten minutes dont thrash or labour
switch off cool right down 
then go for it

[Maico31]

Just ride the thing... we don't have enough years left to go through all that other bullshit.

[Tim754]

Yep just read Maicos above Tim
 AND ever noticed how you "run in " a top fuel dragster........  Strip, rebuild and race it between runs .no time for half throttle wankies then cuddle loving the head and barrel till it cools down so you can change its pooey arse! Just let those 8000hp * rip.
* Cream of Top Fuelers getting 1000+hp per pot on "prehistoric" V8s.