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What creates engine rpm?
#898329
01/07/11 12:50 AM
01/07/11 12:50 AM
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Joined: Oct 2010
Posts: 576
Hr up from KCK
451 D*O*D*G*E
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mopar
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OP
mopar
Joined: Oct 2010
Posts: 576
Hr up from KCK
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Was arguing with my father on this subject at its most basic level..he is a good wrench and asked me what creates the rpms of the engine?I searched but didnt find anything..he asks people for fun and the say the go pedal or the carb..but then they get what he's saying. I believe once the engine is operating at idle the throttle plates(butterflys,flappers) are responsible for an increase in rpm.I understand that more fuel is pulled though the meterings in the carb to keep the proper mix but increased suction from opening the throttle plated allowing more air that it is already asking for by creating the suction because of the restriction of the mostly closed plates relying on the idle circuit.So you get rid of the air restriction by opening the blades and it by nature pulls in more air then all the engineered buisness kicks in.This applys to a single cylinder or 12 as long as its a 4 stroke cycle. So whats the real answer..my ol man likes to over analyze 
1970 Challenger R/T clone
2010 Dodge Journey R/T black,awd,
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Re: What creates engine rpm?
[Re: west]
#898333
01/07/11 05:31 AM
01/07/11 05:31 AM
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Joined: Jun 2009
Posts: 1,212
QLD Australia
Keith Black®
pro stock
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pro stock
Joined: Jun 2009
Posts: 1,212
QLD Australia
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combustion creates rpm. air/fuel quantity varies it. 
Last edited by DarrenB; 01/07/11 05:31 AM.
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Darren Beale
Keith Black Racing Engines®
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Re: What creates engine rpm?
[Re: JoesMopar]
#898339
01/07/11 11:22 AM
01/07/11 11:22 AM
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Joined: May 2004
Posts: 679
N.E Indiana
repad
super street
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super street
Joined: May 2004
Posts: 679
N.E Indiana
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Quote:
Wouldn't the load through the transmission regulate RPM's also? 
WOT RPM @ the end of first gear isn't the same as the beginning of 4th, even if the plates are completely open.
To answer the question as stated "What creates engine rpm?" the answer would be the engine itself or; what creates engine rpm = how does an engine function. I believe that you meant to ask, how does an engine increase/decrease rpm. The simple answer to that is the regulation of air/fuel mixture introduced into the combustion chamber. That coupled with many other variables will determine engine efficiency and performance.
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Re: What creates engine rpm?
[Re: john55]
#898341
01/07/11 11:52 AM
01/07/11 11:52 AM
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Joined: Jul 2008
Posts: 394
md
wicked
enthusiast
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enthusiast
Joined: Jul 2008
Posts: 394
md
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Re: What creates engine rpm?
[Re: Triggerfish]
#898344
01/07/11 02:56 PM
01/07/11 02:56 PM
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Joined: Aug 2005
Posts: 4,799
ILL
MLR426
master
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master
Joined: Aug 2005
Posts: 4,799
ILL
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Quote:
The chicken came first....
after the egg broke  hi Buzz
logan426
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Re: What creates engine rpm?
[Re: repad]
#898348
01/07/11 10:15 PM
01/07/11 10:15 PM
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Joined: Dec 2008
Posts: 2,782
USA
JoesMopar
master
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master
Joined: Dec 2008
Posts: 2,782
USA
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Quote:
Quote:
Wouldn't the load through the transmission regulate RPM's also?
WOT RPM @ the end of first gear isn't the same as the beginning of 4th, even if the plates are completely open.
To answer the question as stated "What creates engine rpm?" the answer would be the engine itself or; what creates engine rpm = how does an engine function. I believe that you meant to ask, how does an engine increase/decrease rpm. The simple answer to that is the regulation of air/fuel mixture introduced into the combustion chamber. That coupled with many other variables will determine engine efficiency and performance.
Hey, leave the rocket science to me....I'm qualified. 
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And I'll add to this.....Atmospheric pressure...
