Breaking in a new Engine - Mototune method

id say that running in at so many revs for so many miles is a bit over the top these days,when you buy a new tractor,combine,lorry,stationary engine/generator,lawn mower or chainsaw then they will normally be run at there designed engine revs straight out of they box from day one and normally still be working as designed many hours/years or miles later,even a husky chain saw being a 2 stroke running on 50to1 petrol to oil mixture will be run flat out from day one and still be good for about 5000 hours work

[yorkie_chris]

Chain saws aside, I'll bet big stuff gets run it at factory.

Wrt the honing, I would take a guess and say that the bottom of the honing grooves has nothing to do with running in except to hold oil as in normal use, but I suspect the top of the grooves after manufacture have tiny burrs on them. And they need a bit of pressure and speed to give the rings ideal wear before the grooves are flattened out.

The interesting thing would be to take a sample of oil at 600mi and see how much metal is in there.

[andrewsmith]

Originally Posted by yorkie_chris

Chain saws aside, I'll bet big stuff gets run it at factory.

Wrt the honing, I would take a guess and say that the bottom of the honing grooves has nothing to do with running in except to hold oil as in normal use, but I suspect the top of the grooves after manufacture have tiny burrs on them. And they need a bit of pressure and speed to give the rings ideal wear before the grooves are flattened out.

The interesting thing would be to take a sample of oil at 600mi and see how much metal is in there.

They are.
Cummins at Darlo has big test units for the diesels and Perkins are the same.

TBH thats on power generation, where its installed and ran at 110% load for 2 hours on commission, which puts the motor to its limit plus some of the rpm above the governor.
All I can say is that is fun and hot once turbos the size of the average 1000cc car engine start to glow

[embee]

To give an idea of the technicalities of bore finishes, these papers (chosen at random from a Google search) show the parameters usually considered in the analysis and manufacture of a modern cylinder bores, and also how to analyse the wear characteristics.

http://www.digitalmetrology.com/Pape...BoreNoBkgd.pdf
http://www.solvemetrology.com/NERD/FC900229.pdf
http://www.michmet.com/3d_s_functional_parameters.htm

...but as I said before, what do the manufacturers know about it?

Originally Posted by yorkie_chris

Chain saws aside, I'll bet big stuff gets run it at factory.

no i think not,i had in the past new 200grand combines and tractors with may be 1 hour on the clocks and there sent out to do a days work which in the case off a 260hp combine is flat out at 2200 rpm for 400 hours or so every year,so there only serviced(oil & filters changed)once a season,and when it comes down to john deer tractors ive known contractors do 30.000 hrs on the same engine and gearbox,so like i say most large diesels are not run in there just used,and at most they may come with a different running in oil which is changed at low hours

[yorkie_chris]

Originally Posted by embee

...but as I said before, what do the manufacturers know about it?

How much of real engineering gets bypassed through warranty dodging lawyers looking out for feckwits giving it 11,000rpm with 10 yards on the clock?

Obeying the "schedule" and letting it lug and chug up a hill at 1400rpm isn't good for it.

[Bibio]

be it wrong or not but i was always led to believe that its not the bore/rings (as such) that you are running in its every thing else. bores/rings will bed in relatively fast compared to say the gearbox which takes time to 'polish' and bed in.

Originally Posted by yorkie_chris

How much of real engineering gets bypassed through warranty dodging lawyers looking out for feckwits giving it 11,000rpm with 10 yards on the clock?

Obeying the "schedule" and letting it lug and chug up a hill at 1400rpm isn't good for it.

or if you drive like my farther(bless him)he can get his diesel car in top gear with in at most 200yards and thats at about 35mph.and i think it was his suzuki vitara that failed its exhaust emissions a year or so ago and the garage had to take it out for a spin,that must have been the fastest it had ever been revved

[yorkie_chris]

Originally Posted by Bibio

be it wrong or not but i was always led to believe that its not the bore/rings (as such) that you are running in its every thing else. bores/rings will bed in relatively fast compared to say the gearbox which takes time to 'polish' and bed in.

I don't think my gearbox got to it's best until at least 30k.

Originally Posted by suzukigt380paul

or if you drive like my farther(bless him)he can get his diesel car in top gear with in at most 200yards and thats at about 35mph.and i think it was his suzuki vitara that failed its exhaust emissions a year or so ago and the garage had to take it out for a spin,that must have been the fastest it had ever been revved

Olde diesels, if they fail on that fill the filter with clean mineral ATF and Italian tune up on the way to the test center... gets them to cough all the crap out!
Or stick some veggie in... My OM601 merc just blew less particulate at test center than the guy remembers 3yr old ones doing on proper derv!

[Bibio]

which veggie oil sunflower or normal and does it mix ok with normal derv?