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Old 05-10-2018, 05:14 PM   #1
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Default Prop Dia

Does anyone know what is the largest prop that you can put on a Mercruiser A1G2. I am looking for diameter only.
Will a 15 inch dia. fit? I now have and I know that it will fit a 14.5 dia.
Thanks .
Don
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Old 05-11-2018, 01:18 AM   #2
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I think it may take up to a 16 inch diameter but that’s almost scrapping paint, I would not exceed 15 inches.
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Old 05-11-2018, 02:11 AM   #3
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Thanks Mike.
I will check it next time at the boat.
Better to be sure than spend boat bucks on something that wont fit.
Just that I am unable to get there at the moment.
Thanks
Don
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Old 05-14-2018, 01:13 PM   #4
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Props should be spaced from the hull or anti-ventilation plate 15% - 20% of prop diameter.

14.5 = 2.175 - 2.9 inchees
15 = 2.25 -3 inches

This is usually why the pitch and blade count is tweaked, but rarely size.

Measure the space you have now and calculate it out to see if you can swing a 15".
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Old 05-14-2018, 11:21 PM   #5
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Thanks shrew
I will do that the next time at the boat.
It seems to be hard to find a 14.5dia. X 15p.
I am running a 14.5dia. X 19p. now and can only get to about 3800 rpm.
So a 15p. should get near proper rpm.
Thanks.
Don
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1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
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Old 05-15-2018, 12:40 AM   #6
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Quote:
Originally Posted by donald View Post
Thanks shrew
I will do that the next time at the boat.
It seems to be hard to find a 14.5dia. X 15p.
I am running a 14.5dia. X 19p. now and can only get to about 3800 rpm.
So a 15p. should get near proper rpm.
Thanks.
Don
Don a 5.7 in that boat should have no problem achieving proper WOT with either a 17 or 19 pitch, must be all that retirement gold you’re carrying around.

When was the last time she was tuned up?
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Old 05-15-2018, 01:00 PM   #7
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Quote:
Originally Posted by donald View Post
Thanks shrew
I will do that the next time at the boat.
It seems to be hard to find a 14.5dia. X 15p.
I am running a 14.5dia. X 19p. now and can only get to about 3800 rpm.
So a 15p. should get near proper rpm.
Thanks.
Don
I see the dilemma. How about weight and weight distribution. 15p seems low. What does the Mercruiser prop calculator come up with?
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Old 05-15-2018, 05:19 PM   #8
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Mike
I think the problem is that all the iron in my blood has turned to lead in my ass.

shrew
The prop calculator states a 14.5dia. X 17p. I am never run it over 3000 rpm as it is, its just that at an idle it is to fast to troll, Wife likes to troll fish.
Just trying to keep her happy.
Thanks to both of you.
Don
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Old 05-16-2018, 01:21 AM   #9
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Quote:
Originally Posted by donald View Post
Mike
I think the problem is that all the iron in my blood has turned to lead in my ass.

shrew
The prop calculator states a 14.5dia. X 17p. I am never run it over 3000 rpm as it is, its just that at an idle it is to fast to troll, Wife likes to troll fish.
Just trying to keep her happy.
Thanks to both of you.
Don
Well unlike iron lead doesn’t rust.
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Old 05-16-2018, 01:23 AM   #10
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Well I made it to the boat today to measure, and I have 1 inch from tip of blade to anti ventilation plate.
I did measure the prop dia. and it is 7.25 inches from center of shaft to tip of one blade (14.5 inches dia.)
I can not find a 14.5 X 15p anywhere, so will go with a 14.5 X 17p.
By the way I have a 14.5 X 17p and I can reach 4400 to 4600 rpm, its just in very bad shape.
Thanks again.
Don
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