|
| Author |
Message |
    
Paul
Visitor
| | Posted on Tuesday, July 20, 2004 - 08:13 pm: | 
|
GM 4-91 (25Hp, 4 cyl, ~1957). How can I know the prop speed? I have the engine RPM, there's only 1 forwared gear, but I don't know the reduction (yet). |
andrew
Moderator
Username: andrew
Post Number: 823
Registered: 11-2001
| | Posted on Tuesday, July 20, 2004 - 08:57 pm: |
|
Mark the flywheel and mark the shaft. Rotate the flywheel one full rotation (or more) by hand and then measure the relative amount of rotation of the shaft to establish the "gear ratio". |
Paul
Visitor
| | Posted on Wednesday, July 28, 2004 - 07:53 am: |
|
Well that was a silly question. It's 1:1 flywheel to prop shaft in forward gear.
Here's another silly question. How do I figure, or find the graph, for the torque at typical cruising RPM of 1200? (the 25Hp rating is at 2000 rpm). |
|
|
|
|
