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Joined: Dec 2005
Posts: 107
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Dec 2005
Posts: 107 |
Got a set of these from a reputable supplier frequently mentioned on this site a couple of years ago when I first started messing with my 1924 Superior four banger. Debugging a problem which turned out to be the vacuum tank I had occasion to replace the plugs. The local Advance Auto parts store here had the same plug (Autolite 3076) listed as agriculture plugs. Reading about plugs on this forum and seeing how short these plugs are, I am wondering if there is a better alternative, maybe a longer plug?
I am not sure why I care because these plugs turned out not to be the problem and are only $2.00 each which makes them pretty much a yearly maintenance item if need be. Just curious what you all think about plugs.
Thanks,
Bruce
Thanks,
Bruce
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Joined: May 2002
Posts: 6,149 Likes: 42
ChatMaster - 6,000
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ChatMaster - 6,000
Joined: May 2002
Posts: 6,149 Likes: 42 |
My experience with autolite plugs at $1 each they turn out to be expensive. I bought a box of 10 for a 4 cylider car and within in a week I had used all (1 failed before and 1 during the test run) and then fitted a set of bosch in the same carand replaces them 25,000 miles later.
Tony
1938 1/2 ton Hope to drive it before I retire
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Joined: Dec 2005
Posts: 107
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Dec 2005
Posts: 107 |
Well, I certainly have had better luck than that with the Autolites. I wonder about a longer plug. Do the bosch extend further down into the cylinder??
Thanks,
Bruce
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Joined: May 2002
Posts: 6,149 Likes: 42
ChatMaster - 6,000
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ChatMaster - 6,000
Joined: May 2002
Posts: 6,149 Likes: 42 |
Generally every manufacturer makes the plugs to the same dimensions, meaning plugs listed for a particular engine are the same from all brands.
Tony
1938 1/2 ton Hope to drive it before I retire
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
Keep your eyes open for an AC-78S. It must be one of the older plugs as the current 78-S is only 1/2 inch reach. This will be your best solution unless you run into some AC-B plugs.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: May 2002
Posts: 1,213 Likes: 1
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: May 2002
Posts: 1,213 Likes: 1 |
If you can get hold of them,you could try a set of CHAMPION W89D plugs.These plugs are also for agricultural machinery,but they have a reach about,or slightly more than the AC78S plugs.  :)
CJP'S 29
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