Running In Engine?

[stuartlaw_78]

Hi all,

Just wanted some opinions on how to run in my motor. I've just finished building it and will be putting the engine back in this week.

My machinist told me not to rev it hard but to load it up so that the rings bed in nicely.

He said to find a good hill and to load it up to 2 grand in 2nd, 3rd, 4th, etc... with foot to the floor but to make sure not to go past 2 grand..

Does this sound about right?

[Baz]

Basically you want to take it easy for the first 1000km. Put good quality fully synthetic oil in it and run it in. Don't rev it hard and try to stay off boost. Make sure you run it in all gears as the machinist recommended. After 1000km change the oil and flush out any debree if any from the rebuild.

[chaos]

yeh what Baz said, just don't push the engine too much or sit it on a certain rev point for ages.

[Cubes]

Do a search.

I wouldn't be running synthetic straight off the bat.

Run a plain mineral oil. Do 2-3 oil/filter changes within 1000km's, I then stuck with a good mineral oil until 10,000km's which was a bit of an overkill, 5000km's is fine.

I found the motor stopped using oil around 4500km's, so in my book up until then it wasn't completely run in.

Better to be safe than sorry I say.

Google will also return some interesting info.

I came across an article where I think it was the jap Honda manuals stated not to run synth until 10,000km's, where as the US manuals stated 1000km's. hrmm..

A few basic guidelines..

No in gear deceleration, simply drop it in neutral, especially within the first 100km's.

Give it a few rev's anywhere up to 3500rpm with quite a bit of throttle, get some load in to it, possibly wire open the wastegate if the afr's are up shiet creek on boost.

Don't load it up for too long

Don't sit on a certian rpm point for too long

Don't labour the motor

Don't let it idle for long periods of time

Edited January 8, 2006 by Cubes

[SXR]

Heres an interesting way. Check it out

Engine Breaking In

Edited January 8, 2006 by SXR

[maccattack]

I'm with Cubes.

Use a mineral oil for the first 1000.

I've done two run in's of late and both used mineral for the bedding in.

Synthetic is too good at lubricating the bore.

You need the pistons to scrape the honing marks from the bore and bed with the walls. If the oil is too slippery and you end up with a varnishing effect on the walls and loose power through blow-by.

Multi filter changes are recommended to remove any contaminates from the oil.

[rb25]

What Cubes said, DO NOT use a synthetic oil straight up.

-rb25