How does this gel with all the advice offered on this forum
http://www.mototuneusa.com/break_in_secrets.htm

 

This has been discussed before.
See here.

 

Interesting. I understand what he is saying and I must admit I "thrash" my co cars from new and they do loosen up quicker. But then I'm not responsible for the potential long term problems of this approach

My new 06? I stuck to the manual. After all - can you seem HUK's response when you go for a warranty claim and explain how you run it in

 

Total, Total, Total Horse

There is almost nothing factually correct in that entire article

 

that's good enough for me

 

Its interesting to read though.

Quite a few of the guys ii know that buy sports bikes to race , always run them in hard on the dyno and swear by it.

 

probably a Beatles/Stones thing Bob

I have too much mechanical sympathy to do that to a new engine

 

I wouldnt do it to mine either

Most of the time they know that the new motor will be stripped for a build quite soon anyway.

One of the guys has a Busa that he has called " project Pisstake " its his test bed for finding what does and doesnt work and is almost quite proud when he has a meltdown .

He has now exceeded 700bhp and it still holds up . The latest incarnation will march past that figure for sure .

 

I'm a fan of running engines in hard, just not going silly with engine speeds.

High loads (torque) means higher cylinder pressures and this is what helps the rings bed in by forcing them against the cylinder walls. The first 50miles are crucial to this. Do this from day one and you will have a better performing engine with low oil consumption, as backed up by piston manufacturers.

just ensure the engine is up to temperature and dont go silly with revs (any high spots on the rings will overheat and work harden).

Just sitting on a motorway for 500miles will do no favours to your engines.

 

A run in that gradually increases rpm and load will give a far better running condition meaning less oil consumption, less blow by gas past the rings and a more predictable and consistent running condition.

Done it several times at work where we plot the length of the break-in v's the oil consumption/blow by level. The longer the break in pattern the more predictable and better the results.

At pre-production stage where extremely accurate results are needed we'll run the following pattern for 8 hours/engine but once we get into mass production and we're far more confident with our test patterns we'll generally just use a 1 hour/engine break in.

I'm not going to go into the exact details of the patterns we use at work but we gradually step up the revs from idle to max available RPM (note not max power but closer to the fuel cut point above max power) over the duration of the break in and step up the engine load as we do so.