Series 1 identification

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Originally Posted by B.S.F.

All my L/R engines have the dome facing inward. .W.

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LR Engines use the cup type core plug where the edges/wall of the cup are tapered and that is what makes the seal.

In a welch plug (sometimes also called an expansion plug) it is a flat disk of metal (not a cup) that is pressed slightly to make a dome. This reduces the diameter of the of the disk, which expands in the engine when flattened out.

Welch type or expanding core plugs
https://www.aulro.com/afvb/images/im...014/11/544.jpg

The easy way to tell if an engine uses cup or welch type is that the holes in the block have a shoulder (welch) or smooth (cup)

Cup type core plug.
https://www.aulro.com/afvb/images/im...014/11/545.jpg

What's the picture of ? .W.

Quote:

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Originally Posted by B.S.F.

What's the picture of ? .W.

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Welch

John

Welch Bros apparently came up with the Welch plug (funny that). The Welch car company was purchased by General Motors (1909)
Core plug - Wikipedia, the free encyclopedia

The Welch plug is a type of core plug used to plug the holes used in the casting process to hold the sand core for the waterways in place. Early days they were threaded plugs but threading the block and making a threaded plug is expensive so a 'lower cost' solution was needed.
They use foam cores now, these melt to nothing so core holes are not needed (saving more in the manufacturing process).

You'll sometimes see them called freeze plugs because people think they are there so that if the water in the block freezes they push out. This can happen but isn't the reason they are there.

[ame="http://www.youtube.com/watch?v=yXVLbzI3xTE"]How It's Made Engine Blocks - YouTube[/ame]



Colin

Top video Colin!

A bit different to the way Chazza does it! :D