<VV> Unusual Cold Jetting Question?

[Dale Dewald]

Hello Grant,

Be careful here--I think the limiting factor in the colder, denser charge 
air will be the dew point.  I think your customer will be unsatisfied with 
the performance of the new set-up if carburetor icing becomes an issue.  To 
be on the safe side, ask him how well the engine performs right now at 
temperatures near the freezing point with high relative humidity.

Dale Dewald
Hancock, MI

At 01:44 PM 7/14/06 -0400, grant young wrote:
>I continue to be amazed at where Corvair engines show up. The marine carbs 
>are my favorites, but today I talked with someone who has a Corvair engine 
>in a Snow Cat. I am going to build some performance carbs for him for his 
>80HP engine, but wanted to poll the more engineering inclined or 
>experienced on our site on the jetting. He will be operating between 5000 
>and 10000 feet above sea level only in obviously cold conditions. While I 
>am comfortable with the jet size reduction required for the altitude 
>change, I am not sure what the impact of the colder denser air would be 
>relative to mixture changes. If anyone knows, please drop me a response. 
>We will be using improved mixture flow modifications and K&N canister 
>style air cleaners. The engine has an FC type of installation.


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