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Conference terri::cars_uk

Title:Cars in the UK
Notice:Please read new conference charter 1.70
Moderator:COMICS::SHELLEYELD
Created:Sun Mar 06 1994
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2584
Total number of notes:63384

208.0. "How can 5 be balanced ?" by CHEFS::LAWSONM (Finite cann't comprehend Infinite) Mon Jun 27 1988 11:29

    Can anyone here explain how Audi can balance their engines with
    5 cylinders. I currently drive a six cylinder car, and wonder how
    they balance that ? 
    
    I guess this is from a view of a 4 cylinder engine having each one
    in a different stoke in the the 4 stroke cycle ???
    
    As you can tell I don't know much about engines ??
    
    Any info most welcome.
    
    Mark.
T.RTitleUserPersonal
Name		DateLines
208.18CALS::THACKERAYTue Jun 09 1992 15:378
    So, the 5 cylinder design is inherently out of balance.
    
    Then why is it that my Audi 5000S 5-cyl is one of the smoothest cars
    I've ever driven (except for my V12 Jag, of course!)?
    
    Now that raises an interesting question: how do Jag set up their V12?
    
    Ray
208.19ULYSSE::CHEVAUXPatrick Chevaux @VBE, DTN 828-5584Tue Jun 09 1992 18:079
    .18�    Then why is it that my Audi 5000S 5-cyl is one of the smoothest cars
    .18�    I've ever driven (except for my V12 Jag, of course!)?
    
    There are several ways to make an engine run smoothly. One is to fit a
    big heavy flywheel, another one is to fit a damper on the crankshaft,
    third is to use the famous japanese counter rotating shafts, etc ....
                                                     
    What is smooth ? at what rpm ?  A V12 can sustain 400rpm (and sometimes
    less) without vibration. The 5 cyl can't do that.
208.205'sDCC::HAGARTYEssen, Trinken und Shaggen...Mon Jun 15 1992 10:553
Ahhh Gi'day...�

      Mine can sustain 7300 without vibration. Better than the BMW 4's
208.21ULYSSE::CHEVAUXPatrick Chevaux @VBE, DTN 828-5584Mon Jun 15 1992 11:505
    Manufacturers tend to do a good job at balancing engines for high rpm.
    It's at low rpm (when idle) that you'll surely recognise the problem.
    
    .20�      Mine can sustain 7300 without vibration. Better than the BMW 4's
208.22Mines good all through the range, not like the VR6DCC::HAGARTYEssen, Trinken und Shaggen...Mon Jun 15 1992 11:584
Ahhh Gi'day...�

    The point  was that I'm not worried about 400 rpm when you have another
    6900 to play with. What will the Jag V12 (production) top out at?
208.23Audi rules OK ?SKIWI::EATONMarketing - the rubber meets the skyThu Jun 18 1992 04:232
Mine is fine too. A little off-beat when at idle which I don't mind at all. A bit
like a bent-8 actually...
208.24 Is it true? SUBURB::POWELLMNostalgia isn't what it used to be!Thu Nov 12 1992 13:4111
    
    	I heard that a Diesel is inherently smoother as the revs rise,
    whilst a petrol engine is inherently rougher.  Certainly the converse
    is true at low revs. Anyone out there know the truth of this?  I have
    the impression that this would be irrespective of the number of
    cylinders, being a generalisation.
    
    	I'm NOT asking for opinions in this!  I am just interested if
    anyone has real facts about this.
    
    				Malcolm.