The Ford Barn - View Single Post - What Defines Over-Revving The Model A's Engine

Bob Bidonde · 05-09-2020, 10:25 AM

Jim,
I have not seen or know of a rod busting through a block on a stock engine. To the contrary, I have seen it on a modified engine.

I think you can run a Model A engine at full throttle with a stock Zenith carburetor, and being limited in RPM by the carburetor's breathing, the engine will not turn fast enough to throw a rod. I suspect that the engine's maximum RPM limited by the carburetor is between 3000 & 3500 RPM. In other words, it has by definition no redline.

05-09-2020, 10:25 AM	#7
Bob Bidonde Senior Member Join Date: May 2010 Location: Long Island, NY Posts: 3,470	Re: What Defines Over-Revving The Model A's Engine Jim, I have not seen or know of a rod busting through a block on a stock engine. To the contrary, I have seen it on a modified engine. I think you can run a Model A engine at full throttle with a stock Zenith carburetor, and being limited in RPM by the carburetor's breathing, the engine will not turn fast enough to throw a rod. I suspect that the engine's maximum RPM limited by the carburetor is between 3000 & 3500 RPM. In other words, it has by definition no redline. __________________ Bob Bidonde