VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1912-1928 Copper Cooled Engine - Spark Plugs

Hello everyone:
I saw two 1923 Copper Cooled Engines this past week. Both will be available for inspection by all of the VCCA members who attend the 50th Anniversary Meet in Flint, Michigan next year.
What is the correct spark plug ( heat range, brand, porcelain design, etc. ) for these copper cooled engines? Both engines now have 1960's AC Spark Plugs in them. I would guess that AC was the correct brand, but beyond that, I have no idea.
My goal is to find 8 used correct spark plugs that either would be purchased or donated by the VCCA to both the Alfred P. Sloan Museum in Flint and the GM Heritage Center in Sterling Heights, Michigan, where the engines are located. Obviously I do not need any NOS spark plugs or even ones that are still in operable condition. These 2 copper cooled engines are for display purposes only.

dtm

Toolman

I have some of the engine specs for the Copper Cooled cars, but the spark plug was not in the list. I will send you a personal e-mail with more information.


Chris

Dave,
I would suspect that the '23 Copper Cooled would have used the same plug as the other '23 cars (7/8” Long AC Titan). I probably have a few but will need to look for sure.

Hello Chipper: Thanks for checking on the correct spark plugs for the copper cooled. I just couldn't stand to see the engines at the GM Heritage Center and the Sloan Museum with modern plugs in them. We will be touring both museums at the Anniversary meet next year.

dtm

I am not so sure these were 7/8" plugs? The 4 Cylinder DELCO-Light Plant about the same time used, because of the tight cyl head combustion chamber, used the 18 mm metic long plugs that was replaced later with the G10 plug.
kenK

Just a thought here, but since air cooled engine cyl head temps are so much hotter than water cooled, I bet they used a plug with a cooler heat range or would have added a huge spark knock problem to the already bad problems those poor things already had with scorching head temps. Has anyone contacted the AACA Library to check for old plug books or any other records? Might be worth a shot to see what they have.