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Old 12-20-2012, 12:50 PM
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lateral gas ports

i fully understand how vertical ports work but when i see lateral ports it looks like a hole from ring land to the bottom of the piston. how does this help sealing? am i missing something. interested in doing to my current motor, any advice would help.

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Old 12-20-2012, 01:27 PM
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Usually gas port holes are drilled vertically from the piston top down to the first ring land . But vertical holes can get carbon-plugged, and they may promote crack formation resulting in piston failure above the groove. An alternative method is lateral holes in the top of the groove . It actually is a half moon hole above the ring letting pressure enter over the top of the ring and pushing the ring tight against the cylinder!

Jester

http://www.hotrodders.com/forum/atta...1&d=1356035543
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Old 12-20-2012, 01:34 PM
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The ports are to apply pressure to the backside of the ring. Horizontal ports do the same thing as vertical, stay cleaner.
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Old 12-20-2012, 01:53 PM
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I know all that but do the holes go under the piston? If so how do they get any pressure to push them? I'm curious how lateral ports will help seal if they are not connected to the combustion chamber. Are they?
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Old 12-20-2012, 02:24 PM
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Quote:
Originally Posted by birkey View Post
I know all that but do the holes go under the piston? If so how do they get any pressure to push them? I'm curious how lateral ports will help seal if they are not connected to the combustion chamber. Are they?
The half hole is above the compression ring (that connects them to the combustion pressure) not drilled through the piston! To drill the 1/2 hole you need a jig and attachment! Look at the pic. I posted. Forget the hole at the bottom of the oil ring land for now!!!!

Are you going to run forced induction?


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Old 12-20-2012, 04:32 PM
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No it is on a small motor with VERY high compression. So a drilled hole that stops before going all the way through the piston? How deep are they drilled?
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Old 12-20-2012, 04:55 PM
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Drilled to the depth of ring groove
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Old 12-20-2012, 04:58 PM
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1/2 inch on all pistons? this is like 2.35"
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Old 12-20-2012, 05:10 PM
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Drilled to the depth of ring groove

Jester
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Old 12-21-2012, 06:55 PM
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seems this would defeat the porpouse of low tension rings
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Old 12-21-2012, 11:07 PM
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Low tension rings seal well on the combustion stroke with the lateral ports and relieve ring pressure and friction on the rest of the stroke creating horse power.

Jester
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Old 12-22-2012, 10:36 AM
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Don't use low tension rings and you will not need gas ports.

Gas ports only become effective in the higher RPM ranges by increasing ring seal and to prevent ring flutter when using low tension rings.

Vertical gas ports are for drag racing when there is less chance of carbon build up. Horizontal gas ports are for endurance racing such as circle track and road racing where carbon build up is more likely.
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Old 12-22-2012, 12:02 PM
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It is a small motor with stock rings at 13:1. I doubt they will seal good at over 7,000 rpm
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Old 12-22-2012, 12:22 PM
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Good advice we run dirt track late model 434 small block with low tension ring top, total deal 2nd and on oil ring we must run a spacer because ring groove i partialy in pin hole because of rod length and stroke my rev limiter is set at 8600 rpm on a tacky track we usually turn 7600-7700 dry slick track might bump limiter
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Old 12-23-2012, 08:11 AM
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Gas porting causes more drag on the cylinder walls and the rings to wear out faster. NASCAR uses lateral gas ported pistons but they use .017" rings, run 8000 to 9000 RPM all day and toss everything after the race.

Using 10W-30 wt oil in lieu of 50 wt oil will gain just as much HP on a dyno.
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