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What creates engine rpm? #898329 01/06/11 11:50 PM 01/06/11 11:50 PM
Joined: Oct 2010 Posts: 576 Hr up from KCK 4 451 DODGE OP mopar
451 DODGE OP mopar 4 Joined: Oct 2010 Posts: 576 Hr up from KCK	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,

Re: What creates engine rpm? [Re: 451 DODGE] #898330 01/06/11 11:54 PM 01/06/11 11:54 PM
Joined: Dec 2008 Posts: 2,782 USA J JoesMopar master
JoesMopar master J Joined: Dec 2008 Posts: 2,782 USA	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.

Re: What creates engine rpm? [Re: JoesMopar] #898331 01/07/11 02:01 AM 01/07/11 02:01 AM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	You might want to specify...What type of engine...? Diesels run at wide open throttle, the RPMs rise when the fuel injectors increase flow.

Re: What creates engine rpm? [Re: Kern Dog] #898332 01/07/11 02:13 AM 01/07/11 02:13 AM
Joined: Apr 2007 Posts: 4,233 petaluma,ca. u.s.a. west master
west master Joined: Apr 2007 Posts: 4,233 petaluma,ca. u.s.a.	The engine is an air pump. The pistons create the suction that draws the air into the pump. More air= more R.P.M's.

Re: What creates engine rpm? [Re: west] #898333 01/07/11 04:31 AM 01/07/11 04:31 AM
Joined: Jun 2009 Posts: 1,212 QLD Australia Keith Black® pro stock
Keith Black® pro stock Joined: Jun 2009 Posts: 1,212 QLD Australia	combustion creates rpm. air/fuel quantity varies it. Last edited by DarrenB; 01/07/11 04:31 AM. -------------------------------- Darren Beale Keith Black Racing Engines®

Re: What creates engine rpm? [Re: 451 DODGE] #898334 01/07/11 08:03 AM 01/07/11 08:03 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	that's too deep for me live every 24 hour block of time like it's your last day on earth

Re: What creates engine rpm? [Re: Keith Black®] #898335 01/07/11 08:43 AM 01/07/11 08:43 AM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Quote: combustion creates rpm. air/fuel quantity varies it. And I'll add to this.....Atmospheric pressure... "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: What creates engine rpm? [Re: 1_WILD_RT] #898336 01/07/11 08:52 AM 01/07/11 08:52 AM
Joined: Aug 2003 Posts: 8,828 Houston, Tx hemi68charger master
hemi68charger master Joined: Aug 2003 Posts: 8,828 Houston, Tx	Quote: Quote: combustion creates rpm. air/fuel quantity varies it. And I'll add to this.....Atmospheric pressure... + foot pressure........ Troy Houston Mopar Connection Club '69 Charger Daytona 440 - auto - 4.10 Dana (now with 426 hemi) '69 Charger 500 440 - 4speed - 3.54 Dana '70 Road Runner 383 - 4speed - a/c (now with 440)

Re: What creates engine rpm? [Re: hemi68charger] #898337 01/07/11 09:14 AM 01/07/11 09:14 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	the starter creates rpms by turning the engine over and starting it,as it has no rpms till the starter turns it first then it increases after that with the throttle opening up with foot pressure

Re: What creates engine rpm? [Re: 451 DODGE] #898338 01/07/11 09:16 AM 01/07/11 09:16 AM
Joined: Mar 2007 Posts: 9,336 South-Central (Sebring), FL Commando1 master
Commando1 master Joined: Mar 2007 Posts: 9,336 South-Central (Sebring), FL	Quote: what creates the rpms of the engine? The laws of Physics. More specifically...... THERMODYNAMICS (or for the hard-core Fundamentalists: "God") Personally I think it's "F.M."

Re: What creates engine rpm? [Re: JoesMopar] #898339 01/07/11 10:22 AM 01/07/11 10:22 AM
Joined: May 2004 Posts: 679 N.E Indiana R repad super street
repad super street R Joined: May 2004 Posts: 679 N.E Indiana	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.

Re: What creates engine rpm? [Re: Commando1] #898340 01/07/11 10:33 AM 01/07/11 10:33 AM
Joined: Jun 2004 Posts: 3,842 Ohio J john55 master
john55 master J Joined: Jun 2004 Posts: 3,842 Ohio	Quote: Quote: what creates the rpms of the engine? The laws of Physics. More specifically...... THERMODYNAMICS (or for the hard-core Fundamentalists: "God") Personally I think it's "F.M." or PFM The Plymouth Win You Over Beat Goes On

Re: What creates engine rpm? [Re: john55] #898341 01/07/11 10:52 AM 01/07/11 10:52 AM
Joined: Jul 2008 Posts: 394 md W wicked enthusiast
wicked enthusiast W Joined: Jul 2008 Posts: 394 md	air, fuel, spark

Re: What creates engine rpm? [Re: wicked] #898342 01/07/11 12:46 PM 01/07/11 12:46 PM
Joined: Dec 2003 Posts: 329 Cincinnati, OH 6 68red440 enthusiast
68red440 enthusiast 6 Joined: Dec 2003 Posts: 329 Cincinnati, OH	The increase of RPM is a result of more air & fuel being added. More air and more fuel = bigger boom = more force on the rods = spins the crank faster

Re: What creates engine rpm? [Re: 451 DODGE] #898343 01/07/11 01:51 PM 01/07/11 01:51 PM
Joined: Jul 2005 Posts: 1,954 Blairsden, CA T Triggerfish top fuel
Triggerfish top fuel T Joined: Jul 2005 Posts: 1,954 Blairsden, CA	The chicken came first....

Re: What creates engine rpm? [Re: Triggerfish] #898344 01/07/11 01:56 PM 01/07/11 01:56 PM
Joined: Aug 2005 Posts: 4,800 ILL M MLR426 master
MLR426 master M Joined: Aug 2005 Posts: 4,800 ILL	Quote: The chicken came first.... after the egg broke hi Buzz logan426

Re: What creates engine rpm? [Re: MLR426] #898345 01/07/11 02:07 PM 01/07/11 02:07 PM
Joined: Jan 2003 Posts: 33,180 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 33,180 Grand Prairie,Texas	In my experience RPM comes with a heavy foot and lack of traction.

Re: What creates engine rpm? [Re: stumpy] #898346 01/07/11 07:32 PM 01/07/11 07:32 PM
Joined: Oct 2010 Posts: 576 Hr up from KCK 4 451 DODGE OP mopar
451 DODGE OP mopar 4 Joined: Oct 2010 Posts: 576 Hr up from KCK	Odd post i am sure but thanks to all for the responses if you read the jumbled tired mess i wrote i think i was close in description more air=higher cylinder pressure knocking the piston dowm faster..thanks guys have a good weekend i'll print this for him.. 1970 Challenger R/T clone 2010 Dodge Journey R/T black,awd,

Re: What creates engine rpm? [Re: 451 DODGE] #898347 01/07/11 08:33 PM 01/07/11 08:33 PM
Joined: Jan 2008 Posts: 3,886 Lost and Spaced B bboogieart master
bboogieart master B Joined: Jan 2008 Posts: 3,886 Lost and Spaced	It's too simple, the revolution of the crank "creates" rpm. R.P.M. is just a measurement of movement. No mater what turns the crank, it is rpm only if the crank turns. Now I was wondering what causes the crank to move. Or are we asking what causes the rise and fall of rpm.

Re: What creates engine rpm? [Re: repad] #898348 01/07/11 09:15 PM 01/07/11 09:15 PM
Joined: Dec 2008 Posts: 2,782 USA J JoesMopar master
JoesMopar master J Joined: Dec 2008 Posts: 2,782 USA	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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