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Old 12-25-2008, 01:42 PM   #1
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Default What's this transfert port is for??

Ofna Force 28 sleeve, look what's i've arrowed in red, don't understand the utility of this port.
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Old 12-25-2008, 02:05 PM   #2
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If I am right then in the piston there are holes lining up these holes.
When the piston is comming down and building up pressue under the piston then some mixture is located right under the piston that will not easily flow into the channels but through the holes in the piston some mixture will find an easy way to the transfer port.

If there is no hole in the piston this port is open at TDC and also some mixture pushed up by the crankshaft will go through it.
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Old 12-25-2008, 02:05 PM   #3
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I think a rat bit through ur sleve there guy
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Old 12-25-2008, 02:24 PM   #4
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Roelof is dead on. Its a shortcut to allow fuel/air trapped under the piston to have a shorter path into the ports. Usually there are holes in the piston skirt that line up with the ports.
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Old 12-25-2008, 03:30 PM   #5
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Quote:
Originally Posted by Roelof View Post
If I am right then in the piston there are holes lining up these holes.
When the piston is comming down and building up pressue under the piston then some mixture is located right under the piston that will not easily flow into the channels but through the holes in the piston some mixture will find an easy way to the transfer port.

If there is no hole in the piston this port is open at TDC and also some mixture pushed up by the crankshaft will go through it.

You're right man I've remove the piston and they've windows line up with this ports.

Thank you
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Old 12-25-2008, 05:48 PM   #6
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does any one remember about a month a go there was a thread talking about porting and some one put a post from a magazine on how to do porting mod, it was a good article to read but i can't find the thread
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Old 12-26-2008, 05:04 PM   #7
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Quote:
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does any one remember about a month a go there was a thread talking about porting and some one put a post from a magazine on how to do porting mod, it was a good article to read but i can't find the thread
I think that this is what you are asking about.
http://www.rctech.net/forum/nitro-ro...ro-engine.html

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