Tuning advise

[speedy357]

It runs fine at half throttle but when at full throttle it shutdowns. Is it lean or rich? I richened it up to 3 1/2 turns on the high needle but dies on take off. Can you guys please give me some advise?

thanks

 

[Propjockey]

What are we working on Speedy?

 

[speedy357]

What are we working on Speedy?

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Traxxas .15 Pro

 

[gil sonsino]

glowplug,airleakage, are some of the things you have to review.

Sounds lean to me .

Gill

 

[speedy357]

glowplug,airleakage, are some of the things you have to review.Sounds lean to me .

Gill

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I just put in a new Mccoy mc-59 checked for air leaks. Maybe I messed up the glow plug again. What is a good plug I could try on the traxxas .15 pro?

Thanks Guys

 

[anthony_marquart]

You should run a traxxas plug in that engine. At least until you get it running well.

 

[gil sonsino]

you can use a Mc 9 or a KB Hp in your .15. Mc 59 is fine for this size.You must check up your head clearance to avoid damaged plugs.How much nitro are you burning?If you run too much lean no plugs will stand in your motor too.

Gill

 

[speedy357]

you can use a Mc 9 or a KB Hp in your .15. Mc 59 is fine for this size.You must check up your head clearance to avoid damaged plugs.How much nitro are you burning?If you run too much lean no plugs will stand in your motor too.Gill

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15% nitro.

 

[Watercadet]

use the 59. if it cuts out at full throttle, give it more fuel. Let it get up to temp before you make adjustments to the needle.

 

[speedy357]

use the 59. if it cuts out at full throttle, give it more fuel. Let it get up to temp before you make adjustments to the needle.

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thanks guys will try it out this weekend.

 

[Preston_Hall]

Typically I would say it's lean. However, my on road car was doing this and I thought, "Well it should at least run if it's rich". WRONG! I had to lean the high end. A boat could be different, but give it a try.

 

[ClayGlover]

hmmm, good point preston. it could be that the LOW speed needle is set to lean. if it has a low speed needle on the carb, try opening it way up, maybe even all the way out. then dial in the high speed needle. you may have to open the carb throat more to keep it idling with the low speed needle all the way out...

 

[speedy357]

I was also thinking if it too lean at full throttle then when I bring it in the glow plug should be dry. If its wet then it should be too rich. Is this correct?

 

[Brian MAhoney]

I was also thinking if it too lean at full throttle then when I bring it in the glow plug should be dry. If its wet then it should be too rich. Is this correct?

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I work on the approach of if not shure richen test and carry on richenning until you are certain it is too rich.

If I have tried richer, and the engine is getting hot, and I am still not getting the performance I want then I will try going leaner.

If you go leaner when uncertain you will eventually go too lean, good only for model shop owners.

 

[Preston_Hall]

All I know is 3 1/2 turns sounds sufficient. When sure you are too rich then just lean it down and see what happens. That is the fastest way.

For some reason the smaller car engine (in a car) would deliver enough fuel to just kill the plug. Set the low end so the dude runs. The high end seems to have more to do with transition.

Now, personally on my 12 boat motors I cut the needles out and used a K&B needle inline. I have never found the need for a low end needle.

 

[Propjockey]

Speedy...do you have a copy of the manual for that engine? It's really detailed on setting the needles.

 

[speedy357]

Speedy...do you have a copy of the manual for that engine? It's really detailed on setting the needles.

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Yes. I have read it maybe 487 times. LOL. I have set them both to factory settings.

 

[nitrokid49]

Sounds like you guys have it covered, but one time I had a similar problem to this. I thought it was my needles so adjusted them over and over again. It was driving me crazy. I looked over my boat really good and found out that my presser line fell off my tuned pipe. I felt so dumb after that, but atleast I found the problem. A simple problem that causes many headaches. Might be worth looking into.

Victor

 

[Roy Munoz]

I had a simmilar problem with a 45..Would run fine a half thro bud die at full..Found out that my pipe was too long..Just one more thing to look at..

 

[Ron Olson]

If all of the above fail to help, check one other place. On the old Traxxas motors, back when they were called Image, they had a problem with the front bearing. They were an open cage design that let air in, completely messing up the needle settings. The only thing helping to seal that area was the aluminum spacer.