<VV> Unusual Cold Jetting Question?

[Roger Gault]

Hi Grant,
I have no real experience with cars at altitude and low temp, and in the
airplanes I used to fly you just pulled the mixture knob out until it ran
rough and then pushed it in a little.

But, I did find this stuff.
http://wahiduddin.net/calc/calc_hp_dp.htm is a density altitude calculator
http://wahiduddin.net/calc/density_altitude.htm gives way too much info on
the subject.  See "Example 2" a little less than half way down for some jet
sizing advice.

Roger

----- Original Message ----- 
From: "grant young" <gyoungwolf at earthlink.net>
To: "Virtual Vairs" <virtualvairs at corvair.org>
Sent: Friday, July 14, 2006 11:33 AM
Subject: <VV> Unusual Cold Jetting Question?


> 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.
> Thanks
> The Carbmeister
>
>
> Grant Young
> Wolf Enterprises
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