running in rebuilt engine...

[andynorfolk]

i should have my car back by the end of next week with a fully rebuilt engine... does anyone have any tips on running it in?

http://mototuneusa.com/break_in_secrets.htm that seems controversial but at the same time also really makes a lot of sense

[mk2bal]

Running in is a grey area. If you think, it does 1000 turns a minute at idle, so a few minutes, hours, days equals millions of revolutions. If you've seen new cars been built they test the output on a rr/engine dyno and thrash it to the max, then mr customer comes along and takes it easy for months!!! I'd probably not cane it for a while, don't overly load the engine up or over rev it, but like I say its a grey area. Some people thrash theirs from day 1, and it stays full of power and reliability for years...

[Wayne]

I would keep it below 3k revs for the 1st 1000miles, mix the driving etc and avoid labouring it.

It might be a good idea to replace the engine oil and filter after 1000miles as well.

[tech1889]

This is a good thread as i was thinking the same.. 1000miles is nothing so thats good

[The Mighty Elvi]

Modern engines don't need running it. Your thinking of the days when you could have any coulour as long as it was black.

[AudiA8Quattro]

Modern engines don't need running it. Your thinking of the days when you could have any coulour as long as it was black.

I don't think that is correct, metal on metal parts still need bedding in, just because clearances are smaller on new engines, it doesn't make any difference.

[Wayne]

Modern engines don't need running it. Your thinking of the days when you could have any coulour as long as it was black.

I don't think that is correct, metal on metal parts still need bedding in, just because clearances are smaller on new engines, it doesn't make any difference.

Thank you I was going by the info we used to supply with all new / rebuilt engines when sold.

[nige_s]

Did you rebuild your engine?  If not surely the engine builder would be the best person to advise you?

A lot also depends on what oils you use and what was actually replaced.  Some engine (not VW or Golf specific) need a mineral oil for running so things like piston rings can bed in, using a fully synthetic would prevent this.  After certain mileage the oil is then changed.

[sharki786]

well when i had my topend rebuilt. i drove it gently for the 1st 500miles localy trying my best not to go over 2rpm, then 100miles after 500miles i tried not to drive it over 3500 rpm then so on till 1000miles then oil change (also clean out your oil pump as all the little bits from the engine would have built up in there.
thats what i did. (a full service after 1000miles) oil, oil filter change and check the rest

[russ-vdub]

well when i had my topend rebuilt. i drove it gently for the 1st 500miles localy trying my best not to go over 2rpm, then 100miles after 500miles i tried not to drive it over 3500 rpm then so on till 1000miles then oil change (also clean out your oil pump as all the little bits from the engine would have built up in there.
thats what i did. (a full service after 1000miles) oil, oil filter change and check the rest

IF you have a new oil filter fitted when the rebuild was done then surely taking the oil pump off and cleaning is unnecessary, thats whats the oil filter is for no? Correct me if i'm wrong of course.