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Old 07-12-2010, 01:38 PM   #1
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I have a question this is something I have never had happen but the last time I raced my nitro engine stalled 5 laps into the race,so today i took it apart to check the piston and sleeve to notice a big hole one the side of the piston is this normal the engine is a peak diablo 15 with side exhaust.I will attach pics of piston



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Old 07-12-2010, 01:44 PM   #2
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I've never seen one with a hole like that, but it looks perfectly round? Maybe it's supposed to be there for lubrication or something? Very strange...but I'm fairly new to Nitro engines...so I don't know the details on all the different ones. Hopefully someone out here does though....
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Old 07-12-2010, 01:48 PM   #3
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thanks
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Old 07-12-2010, 01:50 PM   #4
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Holy... Hole. Never seen nuthin' like that on my Novas...

Granted, the hole means that much less friction with the sleeve, so I wonder if maybe it could be a good thing?
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Old 07-12-2010, 01:58 PM   #5
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I wonder if that works as a transfer port for the intake to enter the case before it heads up into the cylinder.... Whatever its for its too perfect of a hole to be an accident that piston came that way.
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Old 07-12-2010, 02:20 PM   #6
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My LRP z.28 had two extra holes like that, not sure what the function is though, maybe just to lessen the weight.
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Old 07-12-2010, 03:06 PM   #7
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A side exhaust engine.....
So that hole is faced to the large intake port across the exhaust port?
Then under the intake in the sleeve there is also a hole or the sleeve is far cutted out.

With some rear exhaust engines there are 2 facing the side intake ports.

The function is simple. Mixture is also under the piston. When the piston is going down the mixture under in the engine is pushed upwards into the chanels but still some mixture is staying under the piston due the pressure.
When the hole in the piston is facing the hole or cut out of the sleeve mixture from under the piston will be pushed into the chanel as well.
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Old 07-12-2010, 07:49 PM   #8
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Quote:
Originally Posted by Roelof View Post
A side exhaust engine.....
So that hole is faced to the large intake port across the exhaust port?
Then under the intake in the sleeve there is also a hole or the sleeve is far cutted out.

With some rear exhaust engines there are 2 facing the side intake ports.

The function is simple. Mixture is also under the piston. When the piston is going down the mixture under in the engine is pushed upwards into the chanels but still some mixture is staying under the piston due the pressure.
When the hole in the piston is facing the hole or cut out of the sleeve mixture from under the piston will be pushed into the chanel as well.
Exactly, It helps the boost port.
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Old 07-13-2010, 12:15 AM   #9
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Default hmmm

That one got most of us offroaders out there.
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Old 07-13-2010, 05:23 AM   #10
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Thanks for all the input I wasnt sure if it was normal or not.
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