ORIGINAL: supertib
ORIGINAL: BigGrump
The STS .30 comes with a lot less "pinch" than the STS .28. This can give the illusion the engine is broken in before it actually is. When I broke my STS .30 in, I must have gotten in a hurry as I had it running fast at tank six, and race tuned it at about tank 8. I found I had spoiled a lot of the compression. I replaced the piston and sleeve, and this time took it a lot easier. Waited for about 1/2 gallon to tune. Much better. Pinch was gone at the same time, but compression is way up now. I now have it at 2 gallons and compression is holding up the same. Engine does run very well with the STS pipe. My only regret now is that I did not listen and pre-heat the engine before starting it for the first six tanks. I believe now the compression would be even higher.
Dennis
I am very glad to hear things went well......And I compliment you for taking the time to give the motor a fair chance, alot of people would be here badmouthing the motor with the experience you had.. That shows class and humility, two very good traits in a person... If there is anything I can do to help just let me know.... Once day you need to get your finger on one of these STS 30's with some mods, its a total beast of an engine
Yes the STS 30 is an excelent motor, but it is also very fragile to improper break in, and will fail very early if break in isn't correct... With my way of breaking in there is still pinch at 1.5 gallons and starter box breaking compresion at 2 gallons .. I have overseen the break in of a few of these mills now and IMO they are the most sensitive I have seen yet... But the good news is that once its broken correctly the motors seem to hold their compresion extremey well...My piston will go almost to the top of the sleeve, but still makes huge compresion...STS must have used different angles on the sleeve tapers on this mill IDK
Its too bad alot of people aren't going to take the time needed and are going to wreck alot of these motors very early
Hey Supertib! Whats going on dude. Listen I took your advice and ordered the STS
pipe to go with the D30M. I was able to cancle the order for the JP-3 pipe. Mark at
TopSpeedToys gave me a ten dollar discount on the pipe by ordering it with the
engine. I was wondering what method you use to break in this mill. I normally
use a heat cycle type berak in using a heat gun to pre heat the cylinder on
the first few tanks. What do you reccomend and is there anything special to be
aware of on the run in of this engine? Also do you tear the engine down and
and flush out any metal particles before the first tank is run? Don't mean to be a
pest but what glow plugs and percentage of nitro do you reccomend? I appreciate
the info. Like I said before I have a ton of nitro experience but love to hear new
methods as each engine has its own characteristics. Thanks !!
If your not smelling nitro fumes and listening to the sweet song your not LIVING!