: What does it mean!

Smokin J
04-28-2000, 06:19 PM
Hi! I have a 50 HP 2 stroke Mercury on a 16ft Sylvan that runs 30-34 MPH by the speedometer. On the motor above the prop there is a label that says 12x22 and below that is 1.83:1.. My question is what do they mean. (My dealer could not tell me anything, he said, "I just sell them".)Thanks for your help.

Eye Catcher
04-28-2000, 06:32 PM
The 183.1 is the gear ratio.

04-28-2000, 07:49 PM
If you bought from a dealer that ONLY sells them, you bought from the wrong dealer.

04-28-2000, 07:54 PM
Hey Smokin J,

He doesn't know what it means? He only sells them? I don't think I'd buy a bottle of pop from that dealer, let alone a boat!

The 12x22 is the diameter of the prop and the pitch. The 1.83:1 is the gear ratio.

But I have to wonder, how does a 22 pitch prop perform on a 50 hp motor? It seems like quite a steep pitch for that boat, although it may be light enough.....

Good luck......R

04-28-2000, 08:48 PM
1.83:1 = the gear ratio.
12 X 22 = the gear ratio. (same as 1.83:1)
The prop will have the size (pitch) stamped on itself (the prop)...not on the lower unit.
I sell them ...too.

04-28-2000, 10:28 PM
Good answer Terry. I know you work at a dealership. Can you imagine someone selling outboards and gining a answer like that.....da, I donno, I just sell em....sheesh.


jeff reed
04-28-2000, 11:06 PM
12 X 22 is definetly not the Prop. It is the number of gear teeth that make up the 1.83 : 1.00 gear ratio. Somebody correct me if I'm wrong. Your Dealer needs to take a course in public relations.

04-29-2000, 12:08 PM
You're exactly right. Some like it in nominal SAE ratios like cars.....hence the 1.83:1 ratio. Or the other relates drive gear teeth to hypoid or bevel gear teeth, hence the 12 teeth to 22 teeth ratio of 1.83:1.

Well DUH! for me! LOL
04-29-2000, 03:11 PM
Hey Gang,

Just a call mee stoopid! Thats what I get for posting a message afterr working a 12 hour day! I had a total brain fart.

Some how I thought I read about the numbers on his Prop, as well as the lower unit housing. Sorry, my mistake.

I would like to point out, that if he DID have a 22 pitch prop, that would be a rather large pitch for that rig. At least I was right about that.:-)

Good luck......R