Always thought about this when we talk about air intakes and performance exhausts in context of...
04-03-2002, 10:14 AM
#1
Always thought about this when we talk about air intakes and performance exhausts in context of...
how restricted OEM ones are. Take a look at these numbers...
The 1.8L TT engine at 5000 rpm is taking in and exhausting 512.5 gallons (dry measurement) of air and corresponding exhaust per minute and over a one hour period 30,720 gallons of each. To those who tend to reference things in more familiar objects and terms.... converting 512.5 gallons to fifths (as in bottles of booze) you 2,982 fifths per minute. Just for fun and I found this great conversion site....boy I could haved used this on a few projects...<ul><li><a href="http://www.onlineconversion.com/">Convert from- to</a></li></ul>
The 1.8L TT engine at 5000 rpm is taking in and exhausting 512.5 gallons (dry measurement) of air and corresponding exhaust per minute and over a one hour period 30,720 gallons of each. To those who tend to reference things in more familiar objects and terms.... converting 512.5 gallons to fifths (as in bottles of booze) you 2,982 fifths per minute. Just for fun and I found this great conversion site....boy I could haved used this on a few projects...<ul><li><a href="http://www.onlineconversion.com/">Convert from- to</a></li></ul>
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04-03-2002, 01:09 PM
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Hmmmm. I get a lot more than that, MTT....
Your point is a good one. No flame intended; I just wanted to reinforce what you said.
At 5000 rpm and full throttle let's say there's 170+ hp (from a 225) and nearly a Bar of boost. That would mean volumetric efficiency would be over 100%.
By my calcs, since engine goes through a complete cycle every 2 revs, that's 1.8 L x 2500 cycles/min or 4500 L. or about 1188 gallons @ 100% VE. More than likely it's closer to 1400 gallons of air in, and lots more out due to the combustion.
1400 gallons/min is only about 187 cfm, and I think it's pumping more than that.
My $.02
At 5000 rpm and full throttle let's say there's 170+ hp (from a 225) and nearly a Bar of boost. That would mean volumetric efficiency would be over 100%.
By my calcs, since engine goes through a complete cycle every 2 revs, that's 1.8 L x 2500 cycles/min or 4500 L. or about 1188 gallons @ 100% VE. More than likely it's closer to 1400 gallons of air in, and lots more out due to the combustion.
1400 gallons/min is only about 187 cfm, and I think it's pumping more than that.
My $.02