wzuccarello
New Member
- Local time
- 12:31 AM
- Joined
- Nov 10, 2010
- Messages
- 25
The BUT, in cold weather, and engine will want to run richer because cold air is a lot more dense than warm air.
. I have even ran one of them at 40:1 a few times with no problems.
The cold air causes the fuel/ air mix to be LEANER. The air is denser, and that means more oxygen per each intake stroke.Not more fuel.
The ultralight aircraft engines are run near critical temps,and monitored with guages. I raise the needleclips on my Rotax 503 in the
winter, to keep from getting to close to max egt .
I've ran all my ultralights at 50/1 oil mix, Walmart oil. Some guys get 1200 hours on them with this mix.
Since I always have 50/1 mix around, that's whay my chinagirls get, and they seem to like it. Bout 1000 miles on a strait head and 250 miles on a slanthead.
My weedeaters and chainsaws like it too.
No reason to run rich oil mix nowdays, we have modern 2-stroke oils.
The old school numbers, 16/1 24/1 ect were for using strait mineral oil.
Too much oil causes more frequent maintenance. Early carbon buildup in the ring lands causes ring sticking,sometimes bad enough to overheat the piston and sieze.One of the jobs of the rings is to transfer heat from the piston to the cyl wall.
Xtra oil also causes the exhaust system to clog with carbon too.
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