At least I quoted you correctly, albeit paraphrased:

 

I'm sorry but that article is complete bollocks.

I've developed or been involved in developing run in procedures several times. My job revolves around engine development.

Si2k in the link I posted to does the same thing but from memory he's more geared towards lubricant/petrol evaluation in engines and you'll notice the two of us agree throughout the discussion.

One thing to also emphasise my point.
About 1/2 way down there's a bit saying "a picture's worth a thousand words" and has two pistons from run engines. The one from the authors run in method is clearly much much cleaner and he says this is purely down to the run in method. One thing makes me (if I'm generous) think he's misrepresenting his results or (at worst) outright lying about them.

Look at the land area between the crown (top of the piston) and top ring. This area is exposed to the exhaust gases and combusion process since there's no gas seal at that point (That's kind of the whole point of the rings). There should be some discolouration of this area but from the photo is looks as new condition.


So I'm sitting here wondering now should I believe my own experience of engine testing and running in on a full instrumented dyno, the experience of another engineer involved also in engine testing and finally the advice of one of (if not THE) biggest engine manufacturer in the world (what they tell you to do in the owners manual). Or should I believe a website that's telling you some radical information in an attempt to get you to sign up to their newsletter (and make advertising revenue by the looks of it plastered all over the site).

Feel free to ignore me and the posts of Si2k from the other link however we do have the credentials to know about what we speak. The link you posted though I'm highly, highly suspect of.

 

I would say it's a more susinct (sp?) way of phrasing what I said

 

One thing that it's probably also worth mentioning since I have several hats within Toyota. All of the issues I'm mentioning are relative.

I also do all the warranty investigation on Toyotas engines built within the UK (currently ZR petrol engines 1.6L to 1.8L).

We haven't had any warranty claims that we could attribute to poor run in procedure by the customer. We can measure the level of oil consumption, blowby power etc fairly carefully and detect fluctuations. AS a customer though the levels we're measuring at you probably souldn't notice.

 

Hmm.... who to believe....?
The car manufacturers who each spend millions on R&D every day
or some bloke who says he has tried this with 300 engines

Decisions decisions....



Oh... And I have found that you can improve your fuel consumption by 5% by adding salt into the fuel tank. Give it a go. I'll have a website up soon proving it.

 

Fluffy,

I have just bought a one owner 11K mile RAV4 3dr XTR (they don't make the 3dr anymore and haven't since early 06 - hence why I've had to buy a secondhand one) first reg Dec 05 with FTSH. All four wheels have corrosion issues. Toyota say **** off mate; the corrosion isn't bad enough and the paint has only bubbled, not fallen off yet! I'm really quite disgusted since I've bought 2 new Toyotas and 2 secondhand Toyotas form Toyota dealers this last 4 years. OK, so I bought this latest one off an independant and I took it as seen and knew about the alloys being corroded. I did, however, expect more form Toyota than their current negative stance. OK, warranty up after 3 years, but ALL FOUR WHEELS AT 11K MILES AND ON A ONE OWNER CAR WITH ONLY 11K MILES UP??????? Poor. I will be writing to all the car mags...... Sorry for the rant: it's just that I know you work for Toyota...... maybe you could put a word in maybe?!?!?!!?

R

 

You know what I meant.

Nobody said bounce off the limiter - Honda's manual tells you guideline RPMs for break in.

Bore glaze is the lesser of two evils if you want to talk absolutes, the other being bearing shell damage.

Tolerances on the F20C are (I would hope) somewhat better than a Landy btw too.

And before we go there - I have built a few engines, fast road car and large bikes.

 

Why do you keep buying them?

 

I do indeed know what you meant and agree entirely with the lesser of two weavils!

But then, you and I both have a little experience of this game (not as much as the fluffmeister of course).

Furthermore, agree about tolerances too! the V8 is notorious for being very agricultural, which is great for novice rebuilders, but does mean a longer / more crucial running in period.