Mixing Cylinders

[lowNslow]

Anyone have any information on the pros and cons of mixing cylinders. I currently have new style Continentals on my engine, but can get the Superior's for about $300 less.

[cessna170bdriver]

Karl,

At one time in my current engine's prevous life, it had Superior cylinders (standard bore) on #'s 3 and 4, with old Continental cylinders (0.015 oversize) on #'s 1, 2, 5, and 6. It ran smooth this way for about 500 hours, until the current overhaul became necessary. I guess the first thing I'd be concerned about would be equal (or nearly so) piston weight on opposing cylinders.

Miles

[lowNslow]

Karl,

At one time in my current engine's prevous life, it had Superior cylinders (standard bore) on #'s 3 and 4, with old Continental cylinders (0.015 oversize) on #'s 1, 2, 5, and 6. It ran smooth this way for about 500 hours, until the current overhaul became necessary. I guess the first thing I'd be concerned about would be equal (or nearly so) piston weight on opposing cylinders.

Miles

Miles, good point. They did balance the pistons when they rebuilt my engine so it would probably be a good idea to keep it that way. I am hoping I don't need to replace the cylinder, it is leaking a little air by the exhaust valve on one cylinder and I didn't have time to trouble shoot it. But just in case I have been shopping cylinders in case it needs replacing. Air Power,Inc. has the theO-300 cylinders for $599. http://www.factorycylinders.com/

By the way, they also have Autolite spark plugs for $9.98 if you buy 16 or more.

[GAHorn]

If you pull that cylinder you can reface/regrind the valve, and/or replace the valve and seat, and return the cylinder to service using the same piston (if serviceable) with new rings. Otherwise, simply specify the new piston's weight parameters.
No problem mixing cyls from different mfr's.

[lowNslow]

Thanks George, I am hoping that's all it takes. Might just be a glob of lead deposit. My AI has a real nice boroscope and will be over next week to take a look.