[AT] Rationale for firing orders "hOW THINGS WORK"

[Thomas O. Mehrkam]

http://science.howstuffworks.com/radial-engine.htm/printable

A LINK ON FIRING ORDERS AND DESCRIPTION OF RADIAL ENGINES AND HARLEY
ENGINES.

Thomas O. Mehrkam wrote:
> The Harley is actually a two cylinder radial engine. Like an airplane
> engine with several pistons missing.
> 
> BetCleve321 at aol.com wrote:
> 
>> In a message dated 3/22/2004 4:37:37 PM Eastern Standard Time, 
>> chill8 at cox.net writes:
>> I think that nothing  nothing has helped the popularity of JD's about as
>> much as it has Harley Davidson.  And that is a good bit.
>>
>> Charlie
>> Well, Harley Davidson engines are spaced quite differently than 
>> poppin' Johnnys. JDs have a 180degree crank with the pistons rising 
>> and falling at different times. One up , one down.
>> HDs on the other hand have their pistons rising and falling together 
>> although the two cylinders are splayed 52 degrees apart.  You do the 
>> math. Firing sequence will be slightly uneven as a result rather than 
>> a smooth beat such as a Triumph or BSA twinn. Balancing problems are 
>> hell, The JD layout has primary balance worked out but firing impulses 
>> are uneven.
>> They both sound good though.
>>
>> Skip
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> 
> 
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