Since you have multiple questions in one post I will try to answer them.
sk8z27---so would you say that an orion v2 13x2 would be a suitable motor for a tight technical track?
13x2 meaning double or 2 wires is plenty of torque for a tight track.If in a buggy try gearing it with a 20-22 and in truck with a 18-20
How many 5-7 minute runs would i get before having to cut the comm and replace the brushes?
This Depends on YOU
the driver.How hard you hit the brakes and so on.Could be 15-18 runs.Could be 30-40 runs.
VERY IMPORTANT TIP:
When you have your car off the track or in your pits DO NOT
have the car in the air,pull the trigger to top speed and then hit the brakes.While this may seem "COOL" it's VERY damaging to your motor and can damage brushes and comms prematurely cutting down on your RUNS PER REBUILD.If you got $$$ to burn then go right ahead.Not a good idea though.
Are brushes even required every time the comm is cut?---NO.You just wanna make sure they are in good condition and not discolored.After you skim the comm you will need to spend about 2 minutes breaking them back in either with a motor device or installing it and holding the throttle just barely running for 2 minutes.I would say 1/16th of throttle pretty slow.
Fairly new to the electric scene and i'm running p2k2 and speed gem 14x2 motors and they seem to get dirty and need maintenance about every 7th run or so.
You say they get dirty?Can you elaborate on this?Do you race indoors,outdoors or just bashing/playing around????
When you say 7 runs with the stock the brushes should actually be fine unless your overgearing it or running it too long and burning up the brush.
The 14x2 you have will work just fine to start with.Have someone skim the comm and find out what size brush it uses whether it be a Standup(Older Speed Gems) or a P94 Style(Newwer speed gems) brush and get that in a XXX compound.This will make your mod motor last 20+ runs
You wont save money BRUSH wise really but cutting the comm and maintance wise you will.
You can also do XXX brushes in your P2k2.It will slow it down JUST a tad but you will get longer runs before rebuilding it.
I'm looking for the best most maintenance free motor i can get short of going brushless.
Dont be confused.All motor's are different is all.
The Orion V2's:
Positive= Long Lasting Brushes and Comm.Good Performance.Great Magnets.
Negative's= Hardest Motor to Rebuild,You usually have to drop a FULL WIND to compete with other motor's.Fragile Brush Hoods,Brushes Stick,Gearing is a lil picky.
Positive= Long Lasting Brushes and Comm.Great Performance,Great Magnets,and mid level rebuild.Brushhoods are NOT fragile.
Negative= Brushes are hard to find,Offroad Brush is $9.99 a pair and Gearing is a lil picky.
Trinity Cobalt 1:
Positive= With XXX Brushes this motor will have long brush and comm wear.
Good Perfomance,easy to rebuild.Brush Hoods are NOT fragile.
Important Factor.The Cobalt DOESNT have anything to do with long runtime.It's the Brushes.
You can make ANY trinity motor.Silver Can,GD Twins,D2,D3,D3.5,D4,P94,D5 and D6 all last a long time with XXX Brushes.
Negative's= Magnets wear fast,XXX brushes are $13.00.
Regular P94 Brushes for this motor are $3.00-4.00 but when using these brushes they dont last anywhere near as long.4-10 runs depending on circumstances.
Trinity Cobalt 2=
Positive=New Endbell and Brush Design.New Brush is designed for long lasting and to be easy on the comm.Comm last a long time with the XXX brush increasing time inbetween rebuilds.
Negative's=Magnets still wear fast,Brushes are $13.00 a pair.
Positive=Long Lasting Magnets,Easy Rebuild,Most PUNCH or TORQUE out of ANY mod motor.
Negative's=Brushes wear VERY fast and you have to cut the comm often.
Answer for this:
Use the same long lasting brush Trinity Claims in their Cobalts but in the laydown version.Called the XXX Laydown.
If your missing my point.To make a Cobalt LAST a LONG TIME you have to use a $13.00 a pair brush.The Cobalt is like ANY OTHER motor when using regular compound P94 Brushes at $3.00-4.00 a pair.
Positive=One of the best motors around.Great Magnets,easy rebuild and tons of power.
Negative's=Brushes last as long as a regular mod motor with regular brushes.
Accepts Stand Up brushes.
Trinity XXX Standup Brushes,CS Electronics Brush,Reedy 777 Brush.
Bargain Basement Performance:
If your not in the top 3 at your local track,a basher looking for budget but longer lasting performance or just want the BEST BANG for your buck.
Orion Standup Enduro Brushes.These brushes are still $3.00-4.00 a pair and will last about in the middle of what a REGULAR brush and a XXX long lasting type brush will.Great Performance,easy on the comm and a great deal price wise.
If you havent figured it out yet LONG LASTING is possible in ANY Motor.It's the Brush not just the motor.
The Orion Is the cheapest when it comes to this.
It's their design more than the motor itself.
Orion V2 Brushes=$3.00-4.00 a pair.
Issue is Brushoods Being Fragile,Hung Brushes and a PAIN to rebuild.
Trinity XXX brush,Reedy 777 Brush and the CS Electronics Brush
All go for $12.00-16.00 a pair.
Bargain of the Year is:
Orion Enduro Stand Up Brushes in a good Machine Wound Mod for MOST bashers and Even MOST racers.
If you think you have the driving skills,setup and batteries and the ONLY
thing holding you back is motor then handwound all the way.
Handwound Motor's are more crucial in Sedan
Hope this helps.
P.S.I didnt have to spend the time to post this.I know if you look around on ebay and post you can find XXX brushes for $8.00-9.00 a pair.But for the other 98% of the people in the hobby they pay $12.00-14.00 a pair.