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Old 04-24-2005, 07:23 AM   #1
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Default top of piston is black after each run ??

hello

ive noticed that after about 15 mins of runtime, (3 x 5min heats) the top of my piston goes like a scorched dark brown colour

i am using an os tr r spec, 15% nitro but it has 18% oil the os recommendation

i just wanted to know what the reason was for this scorched colouring ? the inner head around the glow plug area is also the same colour

my guess is its the high oil content

thanks
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Old 04-24-2005, 06:29 PM   #2
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And you're running it a little to rich.....color should be more of a tan, when running perfect
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Old 04-24-2005, 08:19 PM   #3
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my OS12TR did that too, but it was running very hot when that happened. does sanding the gunk off the piston have any detrimental effects?
i have a new nova L3 now, but i still like to use my OS.
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Old 04-24-2005, 08:26 PM   #4
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Hi mrgsr,
I would recommend running a fuel with a lower percentage of castor oil to eliminate the discolouring of the piston.
Hope this helps.
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Old 04-29-2005, 09:01 AM   #5
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thanks heaps!

the os recomendation for oil was %18 but i also think thats plenty so ill be getting some fuel mixed this weekend
16%nitro
15%oil
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Old 05-11-2005, 07:58 PM   #6
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i changed fuel to trinity monster 16%

car runs so much cleaner now!
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Old 05-11-2005, 09:18 PM   #7
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if you are racing use a much lower oil content. somewhere around 10% is what most people run. I have found a semi-synthetic blend (synthetic with castor) to be best.

Also if you race in the US you should really be using a higher nitro content also. At least 20%.

John
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Old 05-12-2005, 09:53 AM   #8
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Personally, never will use Trinity again......I was not the only one, everyone in our track with Trinity are not happy with them...don't know why.....including me.

No 1 single problem with O/D, nor Bryon.....
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Old 05-13-2005, 02:03 AM   #9
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rookie, here in australia we dont really have access to O/D or byrons, trinity would have to be the highest quality fuel you can buy off the shelf. about 80% of racers here use fuel that are mixed by another reputable racer anyway.
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Old 05-24-2005, 02:12 AM   #10
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That's funny i run byron 25% nitro here and still get the top of my piston and turbo head black. In fact there's few fine pieces of burnt debris on the head itself all the time after a couple of runs. Anyone knows why?
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Old 05-24-2005, 02:43 AM   #11
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Quote:
Originally Posted by coldfusion
That's funny i run byron 25% nitro here and still get the top of my piston and turbo head black. In fact there's few fine pieces of burnt debris on the head itself all the time after a couple of runs. Anyone knows why?
Keep the engine under 240F, or try to add a 0.1mm head shim. Both work for me.
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Old 05-24-2005, 03:00 AM   #12
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i was running 0.4 head shim, Plug no.6 and at a temp of 120-130C (don't know what's that in fahrenheit?) but it's definitely reasonable temp compared to the rest of the racers here who are running above that anytime.
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