I've never made anything with Ali valve seats always bronze in an ali head, or straight onto an iron head. Not to say it can't be done though

Dural is older than you think, it wasdeveloped by the German Alfred Wilm in 1903, in 1916 Junkers started using it in aircraft, culmanating in the Junkers D1 low wing all metal dural fighter aircraft in 1918. To prevent corrosion Alclad was developed in 1927, and first used in a US airship.

Ian S C

Interesting Mick, I certainly would not make a conrod out of HE30 (6082) as I said earlier Dural is copper bearing which puts it into the 2000 series alloys so 2014 which is the old HE15 is what most people use.

"Duralumin (also called duraluminum, duralum, duraluminium, duralium or dural) is the trade name of one of the earliest types of age-hardenable aluminium alloys. Its use as a trade name is obsolete, and today the term is mainly used to describe aluminium-copper alloys, designated as the '2000' series by the International Alloy Designation System (IADS)."

In the 80s we had DuranDuranumin.

Anyone who fancies writing an article for MEW on commonly encountered non-ferrous alloys and their uses, drop me an email.

Neil

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Mike,

I have built a few engines with valve seats machined directly into the cylinder head in HE 30 alloy or HE15. In a small capacity engine, as far as I know, the heat transfer is such that the metal stays cooler than it would in a larger engine, certainly most of the commercial four stroke glow engines running on methanol fuels seat the valves directly into the alloy head.

If you are running on petrol the temperature will be slightly higher but probably still won't be high enough to cause any damage to the seat.

If you are concerned, you could always make the valve seat and guide housing one assembly in stainless steel with a bronze valve guide. I have done this on engines over 40 cc per cylinder and they have performed well.

Bob