Break in - how much is really necessary ?

[eze]

https://www.tal-ko.com/PDF/TKMBT822S...GGUIDE2017.pdf


Above is a link for breaking in a 2s TKM kart engine

[eze]

Originally Posted by jeffstevens763@g

Manufactures spend colossall amounts of money and time to develop engines what do they know, your money your engine do what you want then if it lets you down only you to blame.

I agree Jeff,

[eze]

Originally Posted by Xk59D

Rings do need to seat in. No if ands or buts to that, that is done with heat cycles which equates to different loads. I.e the gap closes the hotter it gets which is why you do all compression and leak down tests on warm engines.

Anyone who thinks they do not need to run engines in that is up to them but if they didn't need run in makers wouldn't tell you to do It!

Always a contentious area of debate...If in doubt then follow than manufacture's guidelines for sure

[69cmw]

Now we have the running in Police [emoji848]

[eze]

Engine Break‑in Procedure
IMPORTANT: Failure to follow the engine break‑in procedures can
result in poor performance throughout the life of the engine and
can cause engine damage. Always follow break‑in procedures.
1. For the first hour of operation, run the engine at varied throttle
settings up to 3500 RPM or at approximately half throttle.
2. For the second hour of operation, run the engine at varied
throttle settings up to 4500 RPM or at three‑quarter throttle,
and during this period of time, run it at full throttle for
approximately one minute every ten minutes.
3. For the next eight hours of operation, avoid continuous
operation at full throttle for more than five minutes at a time.


That is for a Merc 4s efi engine.

[jambo]

Originally Posted by eze

Engine Break‑in Procedure
IMPORTANT: Failure to follow the engine break‑in procedures can
result in poor performance throughout the life of the engine and
can cause engine damage. Always follow break‑in procedures.
1. For the first hour of operation, run the engine at varied throttle
settings up to 3500 RPM or at approximately half throttle.
2. For the second hour of operation, run the engine at varied
throttle settings up to 4500 RPM or at three‑quarter throttle,
and during this period of time, run it at full throttle for
approximately one minute every ten minutes.
3. For the next eight hours of operation, avoid continuous
operation at full throttle for more than five minutes at a time.






That is for a Merc 4s efi engine

Exactly what I did with my new Merc 150.

[Jeff]

,,, and with the engine trimmed down so as to put more load on the engine ! A heavy loaded boat is a good idea whilst in break in mode - not a problem when you are a fat b like me lol 😍

[Xk59D]

Originally Posted by 69cmw

Now we have the running in Police [emoji848]

And we also have the I have nothing to contribute police

[beamishken]

3. For the next eight hours of operation, avoid continuous
operation at full throttle for more than five minutes at a time.


That is for a Merc 4s efi engine.
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That's pretty much normal operating limits for an outboard if you look at duty cycles.
8-10% is the average duty cycle for a high performance marine engine (Which is what an outboard is for the purpose of engine rating)
So 5 mins in the hour at wot is about it
My take on it would be if your minded to run in take it easy ish for the first couple of hours using varied speeds then normal use afterwards

[jakeyboy]

Originally Posted by breezeblock

for a ring to seat it needs good pressure to push it up against the bore which is generated by load

Hi breezeblock hows it going? Met you at ledaig other week ?

[breezeblock]

Originally Posted by jakeyboy

Hi breezeblock hows it going? Met you at ledaig other week ?

getting on great busy with work and can get out but were back up in 2 weeks time for another week can't wait hopefully the weather will be better than the last time did you mange to get out in your boat after we left

[Searider]

Originally Posted by eze

Engine Break‑in Procedure
IMPORTANT: Failure to follow the engine break‑in procedures can
result in poor performance throughout the life of the engine and
can cause engine damage. Always follow break‑in procedures.
1. For the first hour of operation, run the engine at varied throttle
settings up to 3500 RPM or at approximately half throttle.
2. For the second hour of operation, run the engine at varied
throttle settings up to 4500 RPM or at three‑quarter throttle,
and during this period of time, run it at full throttle for
approximately one minute every ten minutes.
3. For the next eight hours of operation, avoid continuous
operation at full throttle for more than five minutes at a time.


That is for a Merc 4s efi engine.

Looks like only the first hour is any different to how you'd use the engine anyway!

[Roflhat]

On a tohatsu 50 2 stroke break in should only take about an hour. Vary the throttle constantly, don't let it sit at any single RPM. The racing guys rebuild them all the time, they reckon breaking it in over 10 hours would just glaze the bores.
Stick a big prop on it and give it a lot of throttle movement

[Pikey Dave]

Could always buy an Etec[emoji6]

[chipko]

Originally Posted by Pikey Dave

Could always buy an Etec[emoji6]

Aye. Not the 60 though.
As 'break in' period may be a totally different concept. [emoji6]

[Pikey Dave]

Originally Posted by chipko

Aye. Not the 60 though.
As 'break in' period may be a totally different concept. [emoji6]

True[emoji849]

[Rick Fisher]

Breaking in a Yamaha 60 right now .. I ran it 2 hours the first day .. never over 3000 RPM .. mostly 1500- 2000 - 2500 - 2000 - 1500 -

It wasn't boring .. In the third hour I took it up to 4500 for 5 minute intervals, but again lots of different speeds 5-10 minutes max ..

I figure in 5 years I will be glad I did .. who knows . ?

[jwalker]

Originally Posted by Rick Fisher

I figure in 5 years I will be glad I did .. who knows . ?

I think you will be. It's possible to ignore break-in and have an engine which works fine and produces more power but it's simply part worn out and the clearances are larger so the internal friction is less. Its life will likely be considerably shorter than a properly broken in engine. Folks seem only to consider piston ring bedding in when talking about break-in but there are higher stressed parts which require careful conditioning of the running surfaces.