DarZeelon....
ORIGINAL: Fuelman
After about three tanks idling and three tanks on the other one running around
and slightly leaning each run, we did a pinch check. Guess what?- the one that
sat idling the pinch was nearly gone, the one run around it was nice and tight
Well first off, these extreme RPM car engines are a horse of a different color,
as are the ABC racing aero-engines....and have different needs for the care and
feeding of them.
What does idling a car engine for 3 tanks have to do with anything ? Did the
manual say it was OK to do that ? I don't think so.
You are offering this as proof of what ?
How does '10 gallons, after an ABC type break-in, instead of 2, 3, or 4'
go in the same paragraph with your (and Profi's) 'high wear coincides with high
temperatures'???
"high wear coincides with high temperatures'' is referring to high wear associated
with high temps as in a lean/hot high temp condition....not normal temp running
coditions....because as we all know, normal running conditions don't produce
high wear conditions.
If you read the text on this site, the manufacturer wants the engines running
"as rich as possible"....and wants the engines "slightly four-stroking" for the
initial flights.
The K&B manufacture site states that the engines should be launched in a four
cycle mode.
This man says an engine will last 10 gallons with a normal break-in ? (yeah right)
Excessively high temperatures - that is for sure.
But more wear at the normal running temperature, than at a lower, high friction
four-cycling???
Your assertion that engines have more wear at a low speed, cool running
(four stroking) mode is false....plain and simple. Your statements to the newbee's
"if you ran your engine rich, it may already be ruined"....is false.
Once again....I do not, or have ever recommended that a modeler not follow the
manufactures break-in recommendation...although you have. I have never stated
that anyone should run their ABC engines for long periods of time, or any amount of
time for that matter in a four stroke fashion. I do not run my engines that way, in
fact I probably run my Sport ABC engines harder than most during break-in....
because I use the technique used for racing engines....peaked out max for a few
seconds, then back to richened condition for about 15 seconds....then back to peak
to a few seconds.
Three runs of about 6-7 minutes each is all I give them. The peak runs get a few
seconds longer each tank....up to about 20 seconds at the end. This method is quite
similar to the HP racing engine site. I never let the engine run leaner than peak RPM,
in fact....I don't take my fingers off the high speed needle during peak runs....I'm
constantly opening the needle and closing it....making sure the engine is at the full
peak....and at the same time, as rich as it will run and still maintain full peak.
What I have said, is....four stroking wont hurt the sport ABC engine during the break-in
period. Your doomsday threads say the opposite. You have argued to OS Engines, and
Jett engines that their procedures are incorrect. I say their procedures are just fine.
I say the correct way to break-in an ABC sport engine is too start it up and run it.
Use the correct fuel recommended bt the manufacturer....an as long as you don't
over heat it....it will be fine.
FBD.
