Good video on engine break in, including the usefulness of bearing break in

[zzyzx85]

well, i kind of went full send after i had my rod bearings changed out. Took the car on a 900+ mile trip to and from AZ. so much for a break-in lol.

in regards to oil consumption, even after 282k miles it doesn't burn a drop of oil (at least according to the dipstick). Does the weight of the oil these engines use have something to do with it?

[digger]

I don't want people getting false information about engine mechanics.

I really do enjoy reading textbooks. I sometimes search through AIR and TIS to read up on training manuals and functional descriptions of systems as well. I can imagine there are many others on this forum like this with this mindset. That's the environment we have. Your experience matters, but does it align with the truth? In this case no. I would recommend reading a textbook because even the wrong experience is super invaluable.

You sound like a student, read books but never designed anything or done real calculations in practice.

As an example where you need to do more reading. You said the pistons were more highly stressed than everything except the rods . You realise what the strength of a cast aluminium piston are at 200-300C temperature ? compare that the steel used in crankshaft, camshaft and valve springs? Do you really think the pistons see more stress with such low mechanical properties?

[cornerbalanced]

MRF engineering, a shop that has done countless rod bearing jobs with zero failures in ~10 years advises against a break in procedure for newly replaced bearings. Malek himself is a mechanical engineer. BE bearings, in my opinion one of the gold standard for bearings in S65s & S54s also advises against a break in for newly replaced bearings. BE has done more research and testing regarding rod bearings (at least with S65s) than any other person/company that I’m aware of.

http://wiki.rcollins.org/core/index....20each%20other.

Food for thought. Obviously it would never hurt to administer a break-in procedure after bearings are replaced, but I personally won’t be doing so. Interesting video nonetheless!

[jet_dogg]

Advice against being a bit cautious if one so chooses? Wording seems a bit strange.

What kind of world are we living in.

[cobra]

Advice against being a bit cautious if one so chooses? Wording seems a bit strange.

What kind of world are we living in.

There are zero downsides to doing a gentle break-in after a rod bearing job.
There are also no quantifiable upsides.

Do what makes you sleep better at night and everything will be fine

[digger]

i don't think they are advising against doing it, they are advising they don't believe it to be necessary. A subtle distinction me thinks

[Arith2]

I trust this guy more than someone a forum. Here's a free pdf version I found. Open the link in a new tab and the download should work.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://ftp.idu.ac.id/wp-content/uploads/ebook/tdg/ADVANCED%2520ENGINE%2520TECHNOLOGY%2520AND%2520PERFORMANCE/The%2520Internal-Combustion%2520Engine%2520in%2520Theory%2520and%2520Practice.%2520Vol.%2520I_%2520Thermodynamics,%2520Fluid%2520Flow,%2520Performance%2520(%2520PDFDrive%2520).pdf&ved=2ahUKEwj6_NCQ7sf-AhVsQjABHarGB8k4ChAWegQIEhAB&usg=AOvVaw1BhR9g2VFUNt-mX4vo1ymk