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Prop size for 140 alpha one 3.0 GM 4 cylinder
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Author:  dbxtr3 [ Tue Jun 24, 2008 2:55 pm ]
Post subject:  Prop size for 140 alpha one 3.0 GM 4 cylinder
I have a friend that has a 1986 Four Winns 16' Freedom it has a 3.0 GM I/O w/ alpha one 140 lower unit. It has a 3 blade 19.4 aluminium prop that he is looking to upgrade to a SS prop. It comes up on plane real quick now and cruises great about 30 mph w/5 people in the boat.

What would be some good alternative sizes for him to use for a more top speed?
Author:  millhaven_nice_guy [ Tue Jun 24, 2008 8:28 pm ]
Post subject:  Re: Prop size for 140 alpha one 3.0 GM 4 cylinder
Your buddy would want to go with a 21 pitch prop. This will increase the rpm and top speed but hinder the hole shot. Here's a link that may help...It has been posted here many times by Walt.

http://www.go-fast.com/Prop_Slip_Calculator.htm
Author:  ht32bsx115 [ Wed Jun 25, 2008 1:29 am ]
Post subject:  Re: Prop size for 140 alpha one 3.0 GM 4 cylinder
Howdy,

That prop slip calculator is a great tool,


But there's really no way to determine what might be a "better" prop or correct pitch without knowing an accurate (WOT) speed (GPS), accurate RPM (from a verified tach) at that speed and the drive ratio. THEN you can use the Prop Slip calculator to determine which way to go with a prop.


dbxtr3 wrote:
I have a friend that has a 1986 Four Winns 16' Freedom it has a 3.0 GM I/O w/ alpha one 140 lower unit. It has a 3 blade 19.4 aluminium prop that he is looking to upgrade to a SS prop. It comes up on plane real quick now and cruises great about 30 mph w/5 people in the boat.

What would be some good alternative sizes for him to use for a more top speed?




Regards,
Author:  dbxtr3 [ Wed Jun 25, 2008 3:03 pm ]
Post subject:  Re: Prop size for 140 alpha one 3.0 GM 4 cylinder
Where is the best place online to buy a prop?

What are some good brands and brands to avoid?
Author:  230 Mike [ Wed Jun 25, 2008 4:46 pm ]
Post subject:  Re: Prop size for 140 alpha one 3.0 GM 4 cylinder
There are many good prop shops. I can personally recommend Midwest Propeller. http://www.midwestpropeller.com. It's a small shop run by a guy and his son, located in the middle of Nowhere, Kansas (about 5 miles from me), and they work on props sent in from marinas all over the world. There is nothing they can't do where props are concerned.
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