Running In Technical details
Guest
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I posted this under General Questions, but on second thoughts it probably should go here:
Hi Chaps
As you may have seen from the other (EU Import) threads I am in the process of running in my new 555Blue Import.
Question for all those lovely Scooby-Experts :- Why do we have this running in 1000 miles?
I mean which particular bit of the engine is meant to benefit from the "bedding down".
I have heard various stories- piston rings, main bearings, turbo- to stop valves and rings overheating etc etc. If itis so vital - why do so many other modern cars NOT have this (and what experience do you lot have of other manufacturers' running in protocols)?
Lot of questions I know but passes the time of day while I wait for the magical 1000mile service.
BernieM
PS Does the scooby have a rev limiter at it's 7000rpm red line? If so, how does it cut in- cut of power or oscillation on & off power as I have
heard some engines do?
Hi Chaps
As you may have seen from the other (EU Import) threads I am in the process of running in my new 555Blue Import.
Question for all those lovely Scooby-Experts :- Why do we have this running in 1000 miles?
I mean which particular bit of the engine is meant to benefit from the "bedding down".
I have heard various stories- piston rings, main bearings, turbo- to stop valves and rings overheating etc etc. If itis so vital - why do so many other modern cars NOT have this (and what experience do you lot have of other manufacturers' running in protocols)?
Lot of questions I know but passes the time of day while I wait for the magical 1000mile service.
BernieM
PS Does the scooby have a rev limiter at it's 7000rpm red line? If so, how does it cut in- cut of power or oscillation on & off power as I have
heard some engines do?
Scooby Regular
Joined: Jan 2000
Posts: 1,999
Likes: 0
Oil IS thinner - but have been told to start using engine more after 500 miles - just no dump clutch starts until after 1000 mile service!
I will be in same boat come Saturday when I collect my MY99, but I've got it booked in a week later for its service - 1000miles come hell or high water!!!
I will be in same boat come Saturday when I collect my MY99, but I've got it booked in a week later for its service - 1000miles come hell or high water!!!
Scooby Regular
Joined: Apr 1999
Posts: 1,035
Likes: 0
Hi,
In the case of the Subaru, They need to be run in mostly because of the grade of oil used in the first fill-up. This is of a lower viscosity than the normal oil.
The question is - why do they put a thinner oil in to start with?. In the bad old days, mass production engine building was a lot less precise than current practice, and the materials employed were far less exotic, particularly in terms of bearing materials and lubrication. Modern engines (for the most part) produce much higher specific outputs than previous units, and also have a much longer service life too. They are built to quite tight tolerences, and so benefit from careful 'bedding in'. My car has 9500 miles on it, and only started to loosen up after about 6000 Miles.
Maybe resident mech. engineers on the BBS can comment, but for maximum operating life it is usually best to run-in for a period at less than maximum load to allow component surfaces to polish, and for any particles from this, or left over from manufacturing to be safely embedded in the bearing surfaces, or washed out at the first oil change.
Having said that, I know for race engine builds, the running in consists of 30 mins at medium revs, and then another 30mins at full power, or something like that. I suppose this is because the engine is hand-built, and all clearences are precisely tolerenced by the engine builder. This probably removes the need for working clearences to settle by 'running in'
I'll stop rambling now.
A.
In the case of the Subaru, They need to be run in mostly because of the grade of oil used in the first fill-up. This is of a lower viscosity than the normal oil.
The question is - why do they put a thinner oil in to start with?. In the bad old days, mass production engine building was a lot less precise than current practice, and the materials employed were far less exotic, particularly in terms of bearing materials and lubrication. Modern engines (for the most part) produce much higher specific outputs than previous units, and also have a much longer service life too. They are built to quite tight tolerences, and so benefit from careful 'bedding in'. My car has 9500 miles on it, and only started to loosen up after about 6000 Miles.
Maybe resident mech. engineers on the BBS can comment, but for maximum operating life it is usually best to run-in for a period at less than maximum load to allow component surfaces to polish, and for any particles from this, or left over from manufacturing to be safely embedded in the bearing surfaces, or washed out at the first oil change.
Having said that, I know for race engine builds, the running in consists of 30 mins at medium revs, and then another 30mins at full power, or something like that. I suppose this is because the engine is hand-built, and all clearences are precisely tolerenced by the engine builder. This probably removes the need for working clearences to settle by 'running in'
I'll stop rambling now.
A.
Scooby Regular
Joined: Sep 1999
Posts: 48
Likes: 0
Hello to all. I'm new to SIDC. Frankly, I drive not a scooby called Subaru but a yesterday scooby called Nissan. I've read the bedding -in process topic n decided to make some comment.
Bedding or running-in process is to ensure the rings n cylinder walls are forming a good contact just as those of the crankshaft n other bearings. If U don't bed the engine, lifespan will be REDUCED n premature wear n tear will result.
For a hand built engine, the builder will take great pains to blueprint the engine n makesure all clearance n measurements are calculated properly. The factory ones are made to measure one n the rest will follow suit after the engineers have set n calibrated the machines in Japan. There won't be bedding in unless someone turns the crankshaft something like 400 revolutions with all components installed except plugs. That's to ensure bedding in. However, even a hand turned engine needs bedding in. It's simple, at the speed during hand turn is nothing compared to being turned mechanically with all banging, pushing n pulling forces being built inside.
Finally, bedding is a must no matter what. Well, unless one's looking for an immature lifespan of an engine or faster wear n tear. I usually advice oil for charged engines to be replaced every 5K km with oil filter. I'm not sure how much will be needed for a Subaru...pls chk it out in the owner's hand book.
Cheers to all without any offense to all Subaru owners.
Bedding or running-in process is to ensure the rings n cylinder walls are forming a good contact just as those of the crankshaft n other bearings. If U don't bed the engine, lifespan will be REDUCED n premature wear n tear will result.
For a hand built engine, the builder will take great pains to blueprint the engine n makesure all clearance n measurements are calculated properly. The factory ones are made to measure one n the rest will follow suit after the engineers have set n calibrated the machines in Japan. There won't be bedding in unless someone turns the crankshaft something like 400 revolutions with all components installed except plugs. That's to ensure bedding in. However, even a hand turned engine needs bedding in. It's simple, at the speed during hand turn is nothing compared to being turned mechanically with all banging, pushing n pulling forces being built inside.
Finally, bedding is a must no matter what. Well, unless one's looking for an immature lifespan of an engine or faster wear n tear. I usually advice oil for charged engines to be replaced every 5K km with oil filter. I'm not sure how much will be needed for a Subaru...pls chk it out in the owner's hand book.
Cheers to all without any offense to all Subaru owners.
Guest
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Hi,
Running in is necessary to ensure an engines longevity. What it does is wear down all the high spots on pistons/bores, bearings etc that are left by the manufacturing process. This is at the practically microscopic level. But it's true that it is less of an onerous process these days with higher precsion machine tools etc. However, it's still necessary.
I get really annoyed when manufacturers say the first oil change is at the first service eg Vauxhall with the Cavalier at 9000 miles as in that time all the metal particles that have worn off are grinding around the engine. If I bought a new car now like that I would get the garage to change the oil anyway and pay for it to be done.
If you don't believe me, I had my Blade rebored and when I rebuilt it I fitted one of these magnetic traps that sits before the oil filter. So when you change the filter you take this off and clean it. It is always covered in metal particles - nothing major but enough that I don't want them grinding away my main bearings etc.
So, abide by those running in procedures.
Dave
Running in is necessary to ensure an engines longevity. What it does is wear down all the high spots on pistons/bores, bearings etc that are left by the manufacturing process. This is at the practically microscopic level. But it's true that it is less of an onerous process these days with higher precsion machine tools etc. However, it's still necessary.
I get really annoyed when manufacturers say the first oil change is at the first service eg Vauxhall with the Cavalier at 9000 miles as in that time all the metal particles that have worn off are grinding around the engine. If I bought a new car now like that I would get the garage to change the oil anyway and pay for it to be done.
If you don't believe me, I had my Blade rebored and when I rebuilt it I fitted one of these magnetic traps that sits before the oil filter. So when you change the filter you take this off and clean it. It is always covered in metal particles - nothing major but enough that I don't want them grinding away my main bearings etc.
So, abide by those running in procedures.
Dave
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