Vertical o side piston gas porting
Vertical o side piston gas porting
(OP)
From the two ways that I know of milling gas ports for rings in a piston, vertical or sideways; Which will work better? I'm thinking on using one of this methods in a 383 project.





RE: Vertical o side piston gas porting
RE: Vertical o side piston gas porting
RE: Vertical o side piston gas porting
Adding them to typical pistons which are already fitted with rings loose enough to pressurize via groove clearance might be wasted effort. What are your rings' back clearance? Tightening that up (via Speed Pro's groove shims used to be considered a good idea for high speed work.
RE: Vertical o side piston gas porting
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i agree with InHiding
i've used pisons with gasports either way successfully
the only 2 things about the vertical gasports are
1-easier to do
2-makes piston more prone to possible ring land failure if into localized detonation in some engines depending on
how far top ring is down and ring land thickness
usually, the intake notch pad closest to piston deck, is where detonation will 1st likely to occur. Too many top gasport holes in this location, along with thin ring land due to high ring placement ..and cracks or failure occurs in this area (intake-notch -to- deck pad)
the horizontal or side gas ports help keep ring land stronger/intact than vertical gasports
also gasports are hidden from view <Rules cheating :) >
but i still drill my pistons with vertical gasports
in my fixture, i normally just use (8) .050" holes , instead of drilling 12 or so smaller holes like i've seen others do
Larry Meaux (maxracesoftware@yahoo.com)
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