Simviation Forum - 5 cylinder balance

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5 cylinder balance (Read 1023 times)

Oct 17^th, 2009 at 10:44am

chornedsnorkack Offline
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I love YaBB 1G - SP1!

Posts: 363

How balanced is a 5 cylinder straight engine?

A 4 cylinder engine, whether straight or flat, is inherently imbalanced because there are 4 dead centres in a 4 stroke cycle. When 1 cylinder is in dead center, all 4 are. So all 4 must accelerate together.

A 3 cylinder engine has 2 cylinders moving when 1 is in dead centre. But if a middle cylinder is in top dead centre then end cylinders are moving one up the other down. When the middle cylinder is in bottom dead centre, the end cylinders are moving in opposite direction, and therefore the whole engine suffers a rocking momentum.

How about a straight 5 - what are the relevant imbalances here?

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Reply #1 - Oct 17^th, 2009 at 10:46am

ozzy72 Offline
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Have a look at the original Audi Quattro and Quattro S1. Then look through the rally records for the mid-1980s Wink

'Nuff said Grin

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Reply #2 - Oct 17^th, 2009 at 11:42am

Fozzer Offline
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An elderly FS 2004 addict!
Hereford. England. EGBS.

Posts: 24861

Types of Piston Engine Configurations:

http://en.wikipedia.org/wiki/Category:Piston_engine_configurations

So many!... Shocked

...!

...and balance:
http://en.wikipedia.org/wiki/Engine_balance

Paul...

...!

One of my Bikes, in the centre, has a Twin Cylinder, water-cooled engine, with Pistons displaced by 180 degrees, nicely balanced...

...!

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Reply #3 - Oct 18^th, 2009 at 4:19am

chornedsnorkack Offline
Colonel
I love YaBB 1G - SP1!

Posts: 363

Fozzer wrote on Oct 17^th, 2009 at 11:42am:

Types of Piston Engine Configurations:

http://en.wikipedia.org/wiki/Category:Piston_engine_configurations

So many!... Shocked

...!

...and balance:
http://en.wikipedia.org/wiki/Engine_balance

Paul...

...!

One of my Bikes, in the centre, has a Twin Cylinder, water-cooled engine, with Pistons displaced by 180 degrees, nicely balanced...

...!

Honda RC116 is a twin engine, 50 ccm (25 ccm per cylinder). Naturally aspirated, 16 horsepower.

As for an inline 5, Honda RC149 is 125 ccm. However, it is poorly balanced, with weird crankshaft structure.

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