Outboard Motor Forums (by brand) > Mercury/Mariner Outboards
Prop question
Nightmare:
First photo = prop specs. Partly worn away but looks like 10(?).38 (diam) x 14P (pitch)
2nd photo = gearcase ratio. Tooth count is 13 and 26, hence a 2:1 ratio
3rd photo = prop part number
Where prop specs are on a prop are purely based on manufacturer. Most OMC prop specs are cast in rear face of hub. Mercs seem to be stamped on the barrel from the couple I've had. Any identifying marks for work done by prop guys will probably be on the barrel.
bullet20dc:
those pics show exactly what nitey stated (pinion 13 tooth ring 26 tooth, )you need a mfg ref manual to cross ref the serial numbers on those other 2 pics to what model it is as far as pitch goes Im surprised there is no stamping on the barrel outside. OK now for the info your looking for.
first off we need the rpms as also stated before Your really trying to do something here that most dont really do. 40hp motors arent built to do anything but push a boat along and get home. you're trying to max it out but it isnt a strong enough motor to put a one size fits all fix on it. today youre alone and u have prop A on it for max performance, tomorow you go with your bud prop A isnt gonna work you need more grunt. with more power the diff is sorta noticable but with a 40 the diff is significant. I know this prob isnt what you wanna hear but I aint tryin to sell u props my suggestion is , take that motor for what it is and use it with a strong running SS prop prob in the 14 15 pitch range 12 1/2- 13 in diam. see if you can try before buy somewhere But I dont think youre gonna get more then 30 on a great day closer to 28 29 and thats with nothing in it. Youre asking a lot from a small tender type motor
Curt:
--- Quote from: bullet20dc on January 22, 2017, 07:42:15 AM ---
I dont think youre gonna get more then 30 on a great day closer to 28 29 and thats with nothing in it.
--- End quote ---
That's pretty much what I figured too.
Sully401:
Thanks for the info guys! This info has helped quite a bit. Im certainly not trying to push my motor to its limit i would rather take a few MPH less and have a longer life on the motor without a doubt. Most of the reading i have done has people suggesting to try props in the 12-13 Dia and 12-14P. Im currently working on replacing my Voltage regulator in the motor and once i do that ill get my tach back and working and i can start to get into more specifics with the prop. I know i have mentioned some goals i would like to achieve but this ( for now) is more of a general inquiry into what people think i should try for prop sizes. I will search around and see if there is a place i can try different props before i buy.
Curt:
--- Quote from: Sully401 on January 23, 2017, 09:17:59 AM --- I will search around and see if there is a place i can try different props before i buy.
--- End quote ---
@Sully401 Let me know if you find a place that does this!
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