The Ford Barn - View Single Post - STREET MACHInES, Engines, gearing and etc

Ol' Ron · 09-01-2019, 02:54 PM

Been a number of post, about rear end gearing, over drives and performance mods to the engine. There are a number of things you should consider before you make a decision, This may help.
Application of the vehicle. Groceries getter, open road travel. Etc.

For this you have to consider the performance of the engine. A bone stock 239 engine in good tune puts out aprox 80 hp at 3000 rpm. Torque runs from a max of 150 at 2k to 133 at 3k . Actually alittle less with generator and fan.

All this information is available in JWL's book "Flathead Facts"
The original Vehicle took most of this information into consideration when built.

For "street use" the only way you can improve this is to increase the torque output of the engine in the operating range. 2 to 3000 rpm and the only way you can do this is by compression and displacement.

Dual exhaust, more carbs and a hot ignition, doesn't get it done, just milling the heads does more in this range. I hope more people take part in this thread, this way we'll all learn allot and maybe save a few buck in the process.

09-01-2019, 02:54 PM	#1
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	STREET MACHInES, Engines, gearing and etc Been a number of post, about rear end gearing, over drives and performance mods to the engine. There are a number of things you should consider before you make a decision, This may help. Application of the vehicle. Groceries getter, open road travel. Etc. For this you have to consider the performance of the engine. A bone stock 239 engine in good tune puts out aprox 80 hp at 3000 rpm. Torque runs from a max of 150 at 2k to 133 at 3k . Actually alittle less with generator and fan. All this information is available in JWL's book "Flathead Facts" The original Vehicle took most of this information into consideration when built. For "street use" the only way you can improve this is to increase the torque output of the engine in the operating range. 2 to 3000 rpm and the only way you can do this is by compression and displacement. Dual exhaust, more carbs and a hot ignition, doesn't get it done, just milling the heads does more in this range. I hope more people take part in this thread, this way we'll all learn allot and maybe save a few buck in the process.