Breaking in new piston liner

[Kevin Krogness]

Fire that sucker up and run the balls out of it...lol! What do drag racers and Nascar guys do with a new engine?? Martin???

They used to run thinner oils for qualifying

A factory snow machine racer who I know very well told me "the factory fires them to make sure they run and then the team gets them and heat cycles them and then they beat the piss out of them"

 

[James montgomery]

Lol. I like just run balls out sounds like something I would do.lol

 

[Norm Doerr]

Here is an interesting methodology to breaking in an engine.

 

[RobertWurster]

When i drag raced my 64 chevell i would just break in the cam and hold it down.My friend that is an engine builder said break them in as you are going to run them.7,200 rpm shifts and a 5000 stall .so after cam break in i would take it out and run the piss out of it.never had a prob.But them f1 engines are just a totaly difernt animal right there.

 

[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

sounds like a rhetorical question.

Truly a rhetorical question!!!!!!!!! AND THE ANSWER IS????????????????? DON'T HOLD BACK NOW DICK

FOUND YOUR ANSWER. HOPE YOU ARE DOING WELL. BTW MY DAD SAID IT WAS -8 DEG IN WATERLOO WITH THE WIND CHILL THIS MORNING . DON'T YOU WISH YOU WERE BACK "HOME".

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.

Truly a rhetorical question!!!!!!!!! AND THE ANSWER IS????????????????? DON'T HOLD BACK NOW DICK

FOUND YOUR ANSWER. HOPE YOU ARE DOING WELL. BTW MY DAD SAID IT WAS -8 DEG IN WATERLOO WITH THE WIND CHILL THIS MORNING . DON'T YOU WISH YOU WERE BACK "HOME".

Hi Doc, good to hear from U, no I do not wish i was up north although I do miss all the great people I have come to know and all the fun we had both on the water and off the water," simon says" .My question was simply for more info on the topic at hand, how other boaters break there engines in and what method do they determine the break in process is complete before leaning the new motor for max RPM"s so they do not hurt the piston liner seal by being to impatient. There were a few who posted there break in method and others would agree, however no one shared any info on how they determined he process was complete. Here is my process which I have taken from my glow plug article that I have been working on for way to lon.

When U have a new engine, in most cases it has a really tight piston to liner fit and needs a break in period, (lapping the piston to the liner).

This process needs to be fully completed for optimum piston longevity for max RPM's. A good way to

get a visual on this process is to run a gallon of fuel on the smaller engines, (2 gallon on the

larger engines) slighjtly on the rich side, using the throttle to increase and then decrease the

RPM"s thru each tank of fuel, after 2 or 3 tanks, pull the liner out turn it on it side into the sun and slowly rotate and look for streaks starting at TDC and running down the liner towards the bottom. When there are no more streaks anywhere at just below TDC, the engine will have a nice polished area

at TDC all the way around the liner and can be leaned for max RPM's' A fairly new broken in engine

will usually have a good seal allowing the compression to help burn the nitro.

PS., now tell me yours.

dick

 

[dr gary turner]

Dick, I have used your methadology the most, run rich keep piston speed down and after several tanks easy into it and let it go. I have also used lapping compond which I have had for years and lapped the piston. I recently bought some diamond compound, 1 MICRON to lap a P/S. Recently I didn't have too much time to break in a101 P/S so I chucked it up in my lathe and used 2000 grit with WD-40 and worked the area just above the wrist pin and worked down to the skirt. Then ran it rich a couple of tanks then"LET HER GO". I is really running great.

Recently I tried the NO water method on my T-35 and I think I smoked. Not a fan of NO water but restricted water okay, restricted the exit and not the inflow. I think this gives a more stable and uniform temp in the head and motor.

I am going back to Waterloo for my Dad's 94th birthday. Hope to get a Pork Tenderloin and a Rubbarb pie. I miss the Iowa food but not the snow.

Please tell ypur wife hello for me. Hope to see you at a race this. Gary

sandwich

 

[James montgomery]

Lol . Iowa does suck in winter time. Maybe whn u come to iowa u can make a stop in cr or stop on way to waterloo deprnding on wich way u r comeing from and throw a boat or two in with us at ellis. Well the lake is unthawed so I hopeing to go down in next week or two and do some testing for some races this year.

Ttyl james