Gas Ports On Pistons

jimdawg185

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Anyone venture if this works on diesels. Seems with all of the blow-by in these diesels, that drilling gas ports to the back side of of the top rings might help.
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jimdawg185

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Wow, Im surprise that no one has commented. This race motor builder trick has been used for decades, so I figured maybe someone has at least thought about it on a race only oil burner.
 

ToMang07

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jimdawg185

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As far as I have seen, in a gasser, the ring tension just starts the process. Its the combustion pressure that actually pushes the rings out and down. Side clearance (the dimension from the top of the compression ring to the top of the ring grove) allows the pressure to reach the critical area. Problem is that is an obvious issue, large side clearance can cause its own issues on high rpm or motors that need more endurance. Gas ports drilled straight down from the top of the piston to just behind the ring in the groove can provide that pressure to the top and back clearance side of the ring. Then the side clearance can be reduced. This leads to less ring flutter at higher rpm.

Obvious problem with a diesel is the gas ports being clogged quickly. But in a race only application, motor tear down frequency is much higher. So cleaning the ports can be done much more frequently.
 

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