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Posted by Clint Dixon [74.206.62.94] on Tuesday, June 01, 2010 at 19:27:03 :
In Reply to: Belt Pulley Questions posted by Rich in Colorado [71.237.72.4] on Tuesday, June 01, 2010 at 15:42:35 :
Hi Rich. You are welcome to contact me but I wanted to provide some answers here for the benefit of others also.
You do not need a mechanical governor to use a rear tailshaft and/or belt pulley if you are powering something that does not cause a heavy load and will not pull the engine down substantially.
I have never owned a truck with a 251 engine. No one local to me has one, so I can not get a quick look to compare the differences to the 230. I know the carburetors are different between the engines, as well as cylinder head, manifolds, fuel pumps, water pumps, etc. All of these differences mean that a 230 mechanical governor would not be a simple bolt-on to a 251. More importantly, is the geometry of the carb linkage, carb to governor linkage, overriding dog lever on the carb shaft, linkage to the cab control, etc. Taking a complete setup off on one 230 and swapping it over to another 230 does not necessarily mean that adjustments would not have to be made in the process. These setups are very tricky to adjust correctly. I do not know what it would take to get a 230 setup working correctly on a 251. If you are starting from scratch, figure on a lot of design time, trial and error, and luck.
I get asked this question quite regularly. The truth is that I do not have an good answer. After working on several stubborn factory 230 setups, I can can't really say I have any desire to tackle figuring out how to make it work on a 251. If you do try it, please let us know your findings. We would like to hear the results as there appears to be interest out there.
Keep in mind that industrial mechanical governors were designed to control an engine at a set rpm. Power Wagon 230 mechanical governors were adjustable from the cab over a wide range of rpms. Also, the Power Wagon governors could be disengaged so as to have no effect over engine rpms during normal driving.
I do not think an industrial governor would be of much help to start with even it it came off of a 251 originally. You might try and see if you can find a mechanical governor off of a 251 powered Power Wagon fire truck. They should be designed to be disengaged for road use. There are "fire truck dismantlers" here on the Forum. Maybe one of them could fix you up with a governor that would be of help to start from.
Also, there is the truck frame. I am not sure what changed as far as the rear crossmember in the later years, or in the intermediate crossmember where the tailshaft hanger bearing mounts. Are you planning to use a factory tailshaft and belt pulley, or design from scratch?
Junior
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