Proper prop size for 37 DC with 440's

legendlc
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Proper prop size for 37 DC with 440's

Postby legendlc » Thu Mar 21, 2019 10:30 pm

I have 78 37DC with 440's. I purchased as a project and am trying to find the correct prop size. She has 19x19 currently. I haven't had her in the water yet but just checking to see if we are propped correctly.
1978 37 Double Cabin
Lake Cumberland KY

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shade2u2
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Re: Proper prop size for 37 DC with 440's

Postby shade2u2 » Fri Mar 22, 2019 8:29 am

Found this on the FB forum a while back...
Attachments
Prop info from Marinette.jpg
John
1986 39 Sedan w/Crusader 454 & 1.92 drive.
1984 28 Express Hardtopw/single 360 1.5:1 drive (SOLD)
Ohio and Muskingum Rivers (Marietta, OH)

legendlc
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Re: Proper prop size for 37 DC with 440's

Postby legendlc » Fri Mar 22, 2019 6:05 pm

Hmm so I may be under propped. I'll have to check that when I get back home.
1978 37 Double Cabin
Lake Cumberland KY

RBrown
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Re: Proper prop size for 37 DC with 440's

Postby RBrown » Fri Mar 22, 2019 6:32 pm

Our props are 19x19. The boat runs well with them, especially if you have several extra guests along for the ride. The props were 19x21 when we bought her. We dropped pitch after we added an enclosure to the fly bridge and filled the boat with gear.
I would run the boat to see where your WOT RPM's are at. If they stay within Chryslers recommended spec then I would leave them be.
If you are unsure of the condition of your props, it might consider pulling your props and have a prop shop do a prop scan on them. When ours were checked the shop found different pitch on blades as well as some blades slightly shorter than others.

Good luck with your project.

Rob
1986 39' Marinette Double Cabin
Misty Blue
350 HP. Crusaders
Home Port: New Buffalo, MI.

legendlc
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Re: Proper prop size for 37 DC with 440's

Postby legendlc » Fri Mar 22, 2019 7:33 pm

Wow that is all great info. I used to use Herring blue props to tune go fast boats to find that extra MPH. Livorsi came out with a prop slip gauge and that helped allot but as I mentioned in a different post I know how to not be a total noob but going from a fuel injected performance boat to resurrecting a 78 Chrysler 440 big M is a whole new world. Thanks for the info and the props will get pulled and scanned asap. I promised my family we would be in the water this summer and I lost all of last summer and winter so it's time to get things sorted and get her belly wet.
1978 37 Double Cabin
Lake Cumberland KY

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shade2u2
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Re: Proper prop size for 37 DC with 440's

Postby shade2u2 » Mon Mar 25, 2019 9:44 am

Our 39 with 454 Crusaders is running 19x22 - so I was told by the previous owner. It ran well with not much on board. I should check it loaded with our stuff now.
John
1986 39 Sedan w/Crusader 454 & 1.92 drive.
1984 28 Express Hardtopw/single 360 1.5:1 drive (SOLD)
Ohio and Muskingum Rivers (Marietta, OH)

honestcharlie56
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Re: Proper prop size for 37 DC with 440's

Postby honestcharlie56 » Thu Mar 28, 2019 11:57 pm

legendlc wrote: I know how to not be a total noob but going from a fuel injected performance boat to resurrecting a 78 Chrysler 440 big M is a whole new world.


Don't worry about "noob" status here, this forum is full of great people willing to help.
1990 Marinette 32 Sedan Flybridge "Hubba" Lake Charles, LA
Twin Chrysler 318's

legendlc
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Re: Proper prop size for 37 DC with 440's

Postby legendlc » Fri Mar 29, 2019 12:49 pm

I see that i am so excited to finally be making a little progress. I have 2 daughters that are 14 and 11 and am hoping to use the boat as afamily get away and a tool to keep my girls around when the infamous "mid teens" hit lol.
1978 37 Double Cabin
Lake Cumberland KY

Fastjeff
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Re: Proper prop size for 37 DC with 440's

Postby Fastjeff » Thu Apr 04, 2019 6:13 am

Better get them out there boating while you sill can, before 'boys' arrive on the scene,

Jeff (one who knows)
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington

legendlc
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Re: Proper prop size for 37 DC with 440's

Postby legendlc » Thu Apr 04, 2019 8:01 pm

Yes sir all to aware of that plus there will be 1 week a month that I can go to the boat and have "daddy time" lol.
1978 37 Double Cabin
Lake Cumberland KY


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