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Intake Pressures...

801 Views 5 Replies 5 Participants Last post by  Allan, 
redcloud
What pressure (PSI) can I expect from each intake alone...not the DP, but stand alone vaccuum pressure for each intake?
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bandit
Rick said:
What pressure (PSI) can I expect from each intake alone...not the DP, but stand alone vaccuum pressure for each intake?
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im intruiged,why do you want to know rick
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richnct
Automotive intakes might be in the range of 20 (plus or minus 5) inches of mercury (inhg)at idle rpms. Typically it is less at higher rpms. It's not a pressure(psi), but a partial vacuum or suction. Not too sure whether our engines would be much different than that. Are you contemplating installing vacuum operated windshield wipers? (Who's old enough to remember actually using them?)
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Blue Fox
Interesting question. I'm like Bandit, the absolute vacuum of a intake is immaterial, the key is that both intakes have the same vacuum. I have probably done 10 or so syncs, and have never really looked at where the numbers were. Lots of variables to contend with too. Engine speed, atmospheric pressure, gage accuracy, and tongue position. I think I remember between 10 and 20 in Hg on my Morgan Carbtune, but have really not paid much attention to that.
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bandit
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Blue Fox said:
Interesting question. I'm like Bandit, the absolute vacuum of a intake is immaterial, the key is that both intakes have the same vacuum. I have probably done 10 or so syncs, and have never really looked at where the numbers were. Lots of variables to contend with too. Engine speed, atmospheric pressure, gage accuracy, and tongue position. I think I remember between 10 and 20 in Hg on my Morgan Carbtune, but have really not paid much attention to that.
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as blue said,readings[individual #] are very vauge,or they can be and in my opinion,warrent little credibility.

as long as the 2 [4] or even 6 are the same.
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Allan
RichNCT said:
Are you contemplating installing vacuum operated windshield wipers? (Who's old enough to remember actually using them?)
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I had a 65 Rambler back in the early 80's, it had vacuum wipers. The slower you drove the better they worked. Going up a steep hill they would almost stop.

I have electric wipers on my CX.
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