I was wondering if someone could explain to me how putting a vacuum in an intake manifold helps air flow into the cylinders?
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Vacuum in an Intake manifold
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vacuum is a secret. we are not allowed to know it.
I like vacuum because it is a shredder, the longest lasting engines. The low pressure expander makes a super fuel as well. The tease of the low pressure keeps the flow.
the other end of vacuum, the exhaust...
scavenging. two banks of cylinders notice if its sloppy. one bank tugs at another one...only it is on a pressure side after the fire.
big engines tend to ignore that stuff, overlap of 90 degree fires can delay into giant rpm ranges. A 4 cyl or less is a real lesson if you are studying this stuff.Previously boxer3main
the death rate and fairy tales cannot kill the nature left behind.
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Air flows to the low pressure from high, when the intake valve opens as the piston is going down, the higher pressure in the intake is forced into the cylinder. All motors are pressurized just some are atmospheric Pressure. This is of of the reasons cam timing is so critical. if the pressure differential is done right, the momentum of the fill will pack more air in the cylinder than It should hold, giving you a higher than 100% VE
Last edited by JeffMcKC; June 11, 2012, 07:19 AM.2007 SBN/A Drag Week Winner & First only SBN/A Car in the 9's Till 2012
First to run in the .90s .80s and .70's in SBN/A
2012 SSBN/A Drag Week Winner First in the 9.60's/ 9.67 @ 139 1.42 60'
2013 SSBN/A Drag Week, Lets quit sand bagging, and let it rip!
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Originally posted by JeffMcKC View PostAir flows to the low pressure from high, when the intake valve opens as the piston is going down, the higher pressure in the intake is forced into the cylinder. All motors are pressurized just some are atmospheric Pressure. This is of of the reasons cam timing is so critical. if the pressure differential is done right, the momentum of the fill will pack more air in the cylinder than It should hold, giving you a higher than 100% VE
Ah, a man who knows his stuff! I also hate the term "back pressure".TomOverdrive is overrated
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Originally posted by Ron Ward View PostI'm not sure how the mechanicals work, but I have heard that the best idle quality can be achieved with 18" of vacuum in the intake. My guess is it would take a really, really, tall intake to achieve this.
[ATTACH=CONFIG]11925[/ATTACH]
Ronwww.FBthrottlebodies.com
Bruce K Bridges
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I will add to this, that checking the intake vac is important, to see if you really need the bigger carb, if its under 1 inch of vac at WOT as it goes down the track its big enough already, if it goes over 1 inch the carb has become a restriction. Or something above the throttle plates such as a air cleaner, hood is to close blah blah blah2007 SBN/A Drag Week Winner & First only SBN/A Car in the 9's Till 2012
First to run in the .90s .80s and .70's in SBN/A
2012 SSBN/A Drag Week Winner First in the 9.60's/ 9.67 @ 139 1.42 60'
2013 SSBN/A Drag Week, Lets quit sand bagging, and let it rip!
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