Intake manifold pressure
Intake manifold pressure Hey guys,
This doesn't have to particularly be on an LS1, but any idea where I could find out the average suction pressure generated by automotive engines? I'm trying to find out the pressure of the air entering the intake manifold. I assume it would be a function of the engine's displacement and RPM but I can't find much by searching online.
Any help would be greatly appreciated, thanks!
This doesn't have to particularly be on an LS1, but any idea where I could find out the average suction pressure generated by automotive engines? I'm trying to find out the pressure of the air entering the intake manifold. I assume it would be a function of the engine's displacement and RPM but I can't find much by searching online.
Any help would be greatly appreciated, thanks!
Don't know where there are charts, but, can tell you that @ idle the LS 5.7L MAP is anywhere from 20-60 kPa (near 40 kPa avg.) vacuum up to 92-105 kPa @ WOT. This is dependent upon VE, which is based on several variables.
Just that Joecar had posted when mine displayed. So, mine is redundant.
Just that Joecar had posted when mine displayed. So, mine is redundant.
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Don't know where there are charts, but, can tell you that @ idle the LS 5.7L MAP is anywhere from 20-60 kPa (near 40 kPa avg.) vacuum up to 92-105 kPa @ WOT. This is dependent upon VE, which is based on several variables.
Just that Joecar had posted when mine displayed. So, mine is redundant.
Just that Joecar had posted when mine displayed. So, mine is redundant.
If anyone else has some input and/or graphs, that would help me out a LOT!
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Brett Foote
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If you're working on a specific LSx engine and want to check its "vacuum heath", then just hook a vacuum gauge up to the high vacuum port that the PCV line connects to (located just behind the throttle body on passenger's side).
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Last edited by ZeeOSix; Sep 15, 2011 at 07:07 PM.
The readings can vary greatly depending on what the weather is like that day, altitude and how restrictive the intake tract is. A multitude of things influence what the baro is inside an intake. Ideally you would want the 'vacuum' to equal '0' or be equivalent to the atmosphere at WOT (on a naturally aspirated engine at least). At part throttle/low load anywhere from 30-70kPa would seem fairly "normal" for these engines in my experience.
Last edited by JS01; Sep 15, 2011 at 07:29 PM.
No ****. That's why I went back & was removing the word vacuum from the post. Had incorrectly stated it twice. Was distracted while reviewing the post when I saw that joecar had posted. Typed the comment stating the redundant post & forgot that one. Knew that someone would waist time pickin' @ it.
