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Old 03-02-2003, 04:46 PM   #1
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Default MT 12 break in

Ok, so im gearing up for the nitro season, watching some Nascar and reading the instructions for my Mugen MT12 engine when I come across a small section describing fuel use and break in.
It says that this engine should not be used at over half throttle until 2 liters of fuel has been run through it.

Ok, I know lots of you guys out there have ran these engines, what is a good way to break them in?
plus, im gonna run 30% Trinity in it, anything I should do in regards to plug, or head gasket?.

thanks
Nate
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Old 03-02-2003, 05:17 PM   #2
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Sounds exactly like my setup! I run the MT12 with Trinity Platinum 30 %. I broke in my engine by idling it on a stand for two tanks, and drove it slowly for 8 more tanks at very rich settings. After the 10th tank, I finally began to open it up and gradually lean it out. Hope that helps!
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Old 03-02-2003, 07:32 PM   #3
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The instructions that come with the mt12 are really bad when it comes to running the engine.try some of the sites like paris racing for some info.

Last edited by JUN; 10-20-2003 at 06:32 AM.
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Old 03-02-2003, 07:56 PM   #4
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Fastburn when I broke mine in I let it just sit and idle for the first two tanks, then I just drove around at about 1/4 to 1/2 throttle for about three tanks, then I started to lean it out. All and all I ran about a quart and a half threw it for break in. Also 30% seems kind of high I would stick with 25%.
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Old 03-02-2003, 08:04 PM   #5
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well once your NTC3 gets here, im gonna start the break in process.
Ill just find a sheltered parking lot so I know there wont be any snow and spend a day messing around.

thanks for all the help
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Old 03-02-2003, 08:37 PM   #6
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If I am correct you can look at the Novarossi web site, it has an article on how to break-in their motors. Everyone has their own idea, you need to do what you will feel comfortable with. Some of the best motor tuners say break it in as you would race it (just a little richer keeping an eye on temp) and some say idle,idle,idle and slowly go from there. I have done both and have formed my own opinion. But I will keep that to myself and not bother you with it. It's your motor!!!!
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Old 03-03-2003, 11:37 AM   #7
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We just had a long thread regarding breaking in motors and, I think, the overall consensus was that it should be done rich and slow - which makes sense when you're talking about the single most expensive component of your car. . .

I start about 1/8th turn rich on the high (from base settings of 5 turns out on the High needle and 2 1/2 turns out on the Low needle and DON"T TOUCH the mid) and run a couple of tanks, then gradually lean it to close to racing temp.

I fine tune the racing temp at the track.
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Old 03-06-2003, 08:23 AM   #8
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How much is a Mugen MT12?
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Old 03-06-2003, 07:27 PM   #9
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I got the team STS MT12. I let it idle on my starter box for 2 tanks. Then i ran it harder and leaner for the next 4 tanks. Everybody can go on and on about the "best" way to breakin an engine....but that has been done on another thread. When in doubt follow instructions.
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Old 03-06-2003, 07:30 PM   #10
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Hey max, Ntc3 got you the Sts? how does it run?
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Old 03-07-2003, 11:42 AM   #11
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Quote:
Originally posted by simonfdr
How much is a Mugen MT12?

Beween $135.00 to $170.00
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Old 03-07-2003, 02:05 PM   #12
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Where can I get it for 135?
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Old 03-07-2003, 08:34 PM   #13
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Quote:
Originally posted by simonfdr
Hey max, Ntc3 got you the Sts? how does it run?
My engine runs great and never gives me trouble. When it's time for a new engine, I'm buying another sts mill.
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Old 03-28-2003, 01:25 AM   #14
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Default Re: MT 12 break in

Quote:
Originally posted by Fastburn
Ok, so im gearing up for the nitro season, watching some Nascar and reading the instructions for my Mugen MT12 engine when I come across a small section describing fuel use and break in.
It says that this engine should not be used at over half throttle until 2 liters of fuel has been run through it.

Ok, I know lots of you guys out there have ran these engines, what is a good way to break them in?
plus, im gonna run 30% Trinity in it, anything I should do in regards to plug, or head gasket?.

thanks
Nate
Hey Fastburn
Did you get the SG crank motor? Did you have to do anything special to get it to fit into your NTC3? Such as shiming. I am thinking of getting one of these motors but before I get it I wanted to know if I needed to do anything special.
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Old 03-28-2003, 04:54 AM   #15
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I just got my MT12 recently, Its a little monster
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