plenum
Veteran
Joined: Mar 2007
Posts: 281
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RE: plenum
the space in the interior of the intake manifold before the runners. However on this forum some folks will say they replaced the plenum this means they replaced the gasket for the plenum pan on the bottom of the intake manifold.
Hall Of Fame
Joined: Jul 2006
Posts: 12,204
Likes: 10
From: Gainesville, Ga.
RE: plenum
another way to describe it, is the intake(plenum) is a hollow keg, with the throttle body hole on top, and a removable plate forming the bottom of the keg. the removable plate is also called the belly pan. the gasket that seals the bottom plate to the intake (forming the keg) is called the plenum gasket or belly pan gasket. its airtight seal is critical for proper vacuum control. above the belly pan is supposed to be air, with strong vacuum, pulling in air through the throttle body, which is a pcm metered device. below the belly pan is supposed to be a sealed area of oil and lifters and pushrods. the mix of metals (cast iron heads, aluminum intake, and steel belly plan) is a recipe for disaster and about the stupidest of all the stupid things you run into on these trucks. the steel pan expands and contracts differently than the aluminum intake, which saws the gasket apart. the aftermarket solution, still NOT adopted by dodge, is to replace the steel pan with a thick aluminum pan that expands and contracts at the same rate. when (not if) the gasket fails, then the engine sucks unmetered air and oil into the intake, causing loss of oil, loss of power, lean condition, and pinging (spark knocking).
see pics...
https://dodgeforum.com/m_735291/tm.htm
see pics...
https://dodgeforum.com/m_735291/tm.htm
Rookie
Joined: Jan 2007
Posts: 54
Likes: 0
RE: plenum
ORIGINAL: dhvaughan
another way to describe it, is the intake(plenum) is a hollow keg, with the throttle body hole on top, and a removable plate forming the bottom of the keg. the removable plate is also called the belly pan. the gasket that seals the bottom plate to the intake (forming the keg) is called the plenum gasket or belly pan gasket. its airtight seal is critical for proper vacuum control. above the belly pan is supposed to be air, with strong vacuum, pulling in air through the throttle body, which is a pcm metered device. below the belly pan is supposed to be a sealed area of oil and lifters and pushrods. the mix of metals (cast iron heads, aluminum intake, and steel belly plan) is a recipe for disaster and about the stupidest of all the stupid things you run into on these trucks. the steel pan expands and contracts differently than the aluminum intake, which saws the gasket apart. the aftermarket solution, still NOT adopted by dodge, is to replace the steel pan with a thick aluminum pan that expands and contracts at the same rate. when (not if) the gasket fails, then the engine sucks unmetered air and oil into the intake, causing loss of oil, loss of power, lean condition, and pinging (spark knocking).
see pics...
https://dodgeforum.com/m_735291/tm.htm
another way to describe it, is the intake(plenum) is a hollow keg, with the throttle body hole on top, and a removable plate forming the bottom of the keg. the removable plate is also called the belly pan. the gasket that seals the bottom plate to the intake (forming the keg) is called the plenum gasket or belly pan gasket. its airtight seal is critical for proper vacuum control. above the belly pan is supposed to be air, with strong vacuum, pulling in air through the throttle body, which is a pcm metered device. below the belly pan is supposed to be a sealed area of oil and lifters and pushrods. the mix of metals (cast iron heads, aluminum intake, and steel belly plan) is a recipe for disaster and about the stupidest of all the stupid things you run into on these trucks. the steel pan expands and contracts differently than the aluminum intake, which saws the gasket apart. the aftermarket solution, still NOT adopted by dodge, is to replace the steel pan with a thick aluminum pan that expands and contracts at the same rate. when (not if) the gasket fails, then the engine sucks unmetered air and oil into the intake, causing loss of oil, loss of power, lean condition, and pinging (spark knocking).
see pics...
https://dodgeforum.com/m_735291/tm.htm
Hall Of Fame
Joined: Jul 2006
Posts: 12,204
Likes: 10
From: Gainesville, Ga.
RE: plenum
http://www.hughesengines.com/partDet...p?partID=11698
http://www.apsprecision.com/billetplenum.html
get the complete kit w/new intake bolts, gaskets, etc.
http://www.apsprecision.com/billetplenum.html
get the complete kit w/new intake bolts, gaskets, etc.