OzVMX Forum

Clubroom => Tech Talk => Topic started by: evo550 on August 20, 2009, 08:48:16 pm

Title: Jetting ???
Post by: evo550 on August 20, 2009, 08:48:16 pm

Am I right in assuming that a bike jetted perfect for 500m above sea level, would run lean at sea level ?

Title: Re: Jetting ???
Post by: oldyzman on August 20, 2009, 11:22:47 pm

Gday evo,
You could asume that, please consider the other factors, I think it goes something like this. High humidity / High Ambient temp / High altitude all result in less oxygen therefore more fuel, therefore runs richer.
"Others" please correct me if i am wrong as i would not like to mislead on this potentially expensive topic
OLDYZMAN

Title: Re: Jetting ???
Post by: Ji Gantor on August 21, 2009, 08:28:58 am

The higher you are the less oxygen in the air or as it is called "Thin Air"
Less oxygen does promote a richer mix.

Yes a bike tuned at 500m above sea level would run lean at sea level if all other wheather conditions were the same.

Ji

Title: Re: Jetting ???
Post by: lukeb1961 on August 21, 2009, 09:58:05 am

http://www.iwt.com.au/mikunicarb.htm

or  think.. think...   reaches for ancient edition of University Physics - ah yes, the Ideal Gas Law.  Recalculate from first principles.  25 marks  :P

Title: Re: Jetting ???
Post by: micks on August 21, 2009, 11:11:09 am

rad