Breakaway Torque

[Doug in Oz]

Would anyone out there in the big wide world know the breakaway torque for a 1925 Big Six engine. 

I am considering modifying the starter clutch and doing away with the pawls etc and replacing 

with a one way CKk type bearing. 

Thanks in anticipation

[The Commander]

Hi Doug in Oz

I do not know what the breakaway torgue is on the motors. But interested in your idea to modify them.

Would you explain

The Commander

Rick

[Guest]

Are you referring to the initial torque that it takes to start turning the engine over?  If so you could find your out by using a torque wrench on the front of the engine or use the hand crank and a spring scale.  If this is the number you are referring to I don't know about your engine but my newly rebuilt 200 ci Pontiac engine takes 48 ft. lbs. to start turning.

Good Luck in your enterprise.

[Doug in Oz]

Yes breakaway torque is the torque required get an engine moving from stationary. It seems it varies from engine to engine so it appears I will have to measure mine with a spring scale. The idea  is to remove the starting clutch complete from the engine front pulley, manufacture a new hub to carry the sprocket and a one way clutched bearing. These bearings are of the exact same size as the 6200 series of standard bearings.  At this point I am gathering information so I can select a bearing that will accept the starting torque and will also accept the engine revs. So far it appears the I will be able to incorporate this into the existing pulley so the external  appearance of the set up will not change. 

Quite happy to pass on information and drawings once I have made it work, but it could take some time.

[The Commander]

Doug in Oz

 

This is very interesting as I have many of these engines. I have actually had one of them lock up while drining ... NOT a nice result. 

 

If their is something better, very interesting.

 

Please post your progress