Briefing Doc - Forum
Source: Model T Ford Forum: Speedometers (22nd-27th January 2014)
Main Theme: This forum thread centers around a 1914 Model T Ford owner's (Erica Wright) query about her Stewart Model 100 speedometer. Discussion revolves around identifying the speedometer model, verifying the correct setup for her year, and understanding the proper installation and maintenance of early speedometers.
Key Facts and Ideas:
Expert Identification: Forum members quickly identify Erica’s speedometer as a Stewart Model 100, potentially a "Ford Special" variant, based on visual cues and the provided "60T-8P" road gear information.
Importance of Russ Furstnow: Multiple members highlight Russ Furstnow as the foremost authority on antique speedometers, recommending his books and services. Russ later confirms the identification and suggests restoration for longevity.
Road Gear Mounting Debate: A significant debate ensues regarding the proper mounting of the road gear to the wheel hub.
Some argue for a pressed-on fit, citing machined hubs with a lip designed to accept the gear.
Others insist on the necessity of screws for secure attachment, referencing early hubs with predrilled holes.
The debate highlights the evolution of hub design over the 1914-1919 period, with later hubs eliminating the need for machining and potentially relying on a tight press fit.
It's crucial to use screws in Erica's case to prevent damage to the swivel: "Don't let any one tell you that all you need on your 14 is a lip fit. The gear WILL come off and when it does it will demolish your swivel." - Dave Huson
Speedometer Accuracy: Despite being antique technology, forum members attest to the accuracy of restored Stewart speedometers, even comparing favourably to modern GPS units.
Alternative Solutions: While Erica ultimately decides to pursue restoring her original speedometer, a suggestion for a modern GPS speedometer as a reversible, accurate, and non-invasive solution is discussed.
Notable Quotes:
"Sure looks like everything is correct for 1914 except perhaps the road gear..." - Richard Gould
"If Russ Furstnow doesn't see this and post a reply, contact him. He's the go-to guy for all things speedometer." - Steve Jelf
"You MUST have the drive gear mounted with screw or you risk damaging the swivel, spokes and other things." - Dave Huson
"The best thing to do is look at Russ's book. Keep in mind that your set up was an aftermarket item in 1914, so almost anything would be correct." - Larry Smith
"The road gear on her car is the Stewart spoke type gear, P/N 8685. When it comes to centering a gear, this is the best gear to mount IF you have the Ford machined hub. There needs to be three screws attaching the gear to the wheel, though." - Russ Furstnow
"At the risk of being offensive, I confess to using a GPS speedometer that mounts to the firewall with a suction cup! IT'S GREAT!" - Jon Allen
Conclusion:
The forum thread provides valuable insights into the complexities of early Model T Ford speedometers, particularly the Stewart Model 100. It highlights the importance of expert knowledge, proper installation, and the availability of alternative solutions for accurate speed measurement. Notably, the discussion emphasizes the evolution of hub design and its implications for road gear attachment, demonstrating the need for careful consideration of model-year specific details.