Breaking in new piston liner

[James montgomery]

Whn breaking this new p/l in should I unhook the water lines to heat the engine up and run it rich for a few tanks or leave the water lines on. Wich is the better way to go.

James

 

[moparbarn]

first few tanks on the bench at a fast idle, rich enough to keep it around 180* to 220*. use the needle & fuel to cool it. an infra red temp gun aimed right next to the glow plug on the head button is a good tool for measuring temp B) . let it cool completely between tanks, piston all the way down. the to the pond, still no water, very rich, not wide open for another few tanks. add water & gradually lean it down till it runs well .

 

[javier molina]

thats all correct same process is done with every motors i have

 

[James montgomery]

Awsome. So moter doesnt really need a load on it the for first afew tanks then? I will take this advice and use it as I have not been in the rc boating world for to long. So run two full tanks rich at high iddle on bench and then do the same with load on it.

Thanks guys james

 

[RodneyPierce]

I usually run a hand full of very rich tanks through it on the water making sure the motor makes plenty of heat. Then start to lean it in from there. Heat is critical. If you dont get heat in the motor, your just beating the crap out of the piston/sleeve.

 

[richard jones]

first few tanks on the bench at a fast idle, rich enough to keep it around 180* to 220*. use the needle & fuel to cool it. an infra red temp gun aimed right next to the glow plug on the head button is a good tool for measuring temp B) . let it cool completely between tanks, piston all the way down. the to the pond, still no water, very rich, not wide open for another few tanks. add water & gradually lean it down till it runs well .

I have a couple of questions please,

what does the "break in" process actually do.

and what type of info do U use to determine if it is broken in properly.

thank you

dick

 

[Kevin Krogness]

It seasons the piston liner fit. You can usually tell when it is broken in as it will launch easier and wont get stuck at tdc all the time. And athe whole new side ofof your engine will show itself!!! A heat gun really helps the process.

 

[timothy johnson]

So at low idle you can run a complete tank without overheating??

 

[James montgomery]

Thanks guys for the info will put some of this to work as soon as it warms up and the lake unthaws. Rodney hope to see u guys soon.

Thanks guys james

 

[mtruex]

first few tanks on the bench at a fast idle, rich enough to keep it around 180* to 220*. use the needle & fuel to cool it. an infra red temp gun aimed right next to the glow plug on the head button is a good tool for measuring temp B) . let it cool completely between tanks, piston all the way down. the to the pond, still no water, very rich, not wide open for another few tanks. add water & gradually lean it down till it runs well .

I have a couple of questions please,

what does the "break in" process actually do.

and what type of info do U use to determine if it is broken in properly.

thank you

dick

sounds like a rhetorical question.

 

[Tim Kish]

Would be interesting to see a poll on how people break their engines in.

I have always done this on the water and have never had any problems but having new motors for the twin this year and no other boat to run them in first it would be a lot easier to run them in on the beach .

Tim

 

[dwilfong]

Think about this you need heat to expand the eng parts to have the clearance .

You run the eng on the stand and build heat.

The only way you will build heat not under a load is to run lean. :huh:

The head will get hot but not the piston.

So what have you accomplished? :mellow:

Also think about this. the top of the liner will get hot but the bottom will stay cool.

Now with the liner in the case the top needs to expand more than the bottom.

How can it expand more than the bottom?

Clearance the out side of just the top of the liner and it will have room to expand when things get hot.

Yes Dick I was paying attention.

David

 

[Tim Kish]

That may make good sense to you David but there are a number of accomplished people that use that method .

Car company Traxxass suggests your first full tank be at idle with no load?

Not disagreeing with you just interested.

Tim

 

[anthony_marquart]

my vote ,.. run blubber rich, on the water, no water to engine, WOT should just barely get on pipe,.. then back off,.. about 6-9 tanks like that,.. maybe running 35 mph in a .21 rigger.. restrict the water to 0.050 hole in top of head,.. add the water and lean down till is comes fully on the pipe.. then leave it alone and and work on pipe length and props.

 

[Tim Kish]

The motor in my twenty hydro was broken in with lots of very rich runs at a good temp and it has been good for four seasons now .

I put a brand new motor in a sport forty , ran one tank to get the needle .

I then went to a time trial and beat on that motor all day long.

I then used that same motor for two full seasons of racing and it was one of the best motors I had ever had.

Maybe the break in isn't as crytical as we think?

Tim

 

[dwilfong]

engines dint need to be lean to make heat

infarct a lean engine will make less heat than when the mixture is right on

the hottest get is is obtained with a correct fuel mixture

Greg I agree under a load that is true.

But on the bench with no load?

Dose it not take a load to burn fuel?

 

[anthony_marquart]

Maybe it's not.. but boy it sure was in that past.. The motors are alot better then they used to be for sure..,

 

[James montgomery]

Wow . How intesting everyone seem to have a opinion on how the break in should go be and seem that they all work well. I gess finding a good way for me to break in is wht I need to find. Im more less leaning torwards run rich with no water and lean out fromthere. All good tip and opinions.

James

 

[richard jones]

It seasons the piston liner fit. You can usually tell when it is broken in as it will launch easier and wont get stuck at tdc all the time.

my vote ,.. run blubber rich, on the water, no water to engine, WOT should just barely get on pipe,.. then back off,.. about 6-9 tanks like that,.. maybe running 35 mph in a .21 rigger.. restrict the water to 0.050 hole in top of head,.. add the water and lean down till is comes fully on the pipe.. then leave it alone and and work on pipe length and props

The motor in my twenty hydro was broken in with lots of very rich runs at a good temp and it has been good for four seasons now .

Maybe the break in isn't as crytical as we think?

Here are some condensed posts regarding break in, ( the how I do it posts), anyone else care to tell us how they do there engine break in, also how U tell when it is "broken in", and no Martin it was not a "rhetorical question", may be U would like to share how u do it and how do tell when it is "broken in"?

dick

 

[Buckshot]

Why don't you enlighten us Dick???