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Date Posted: - Friday - 09/ 4/09 - 1:48pm
Author: Bruce
Subject: Borg Warner Velvet Drive
Does anyone know the original gear ratio on the Borg Warner velvet Drive for a M31/32? I have the original Perkins 4-107 and velvet drive, but the drive plate was scratched out where the ratio is listed.
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Replies:
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Ratio -- Steve M-32 SEAN O'Sea, - Friday - 09/ 4/09 - 7:52pm
Mine is a 71c 1:1. Original I think.
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Borg Warner -- Bill Kranidis, - Friday - 09/ 4/09 - 8:30pm
Steve is right
Original M31/M32 Perkins 4-107 has a Borg Warner 71C with a 1:1 (direct drive) ratio.
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Original Prop -- Bruce, - Thursday - 09/10/09 - 12:52pm
1:1, Okay - thanks very much. Now how about the prop? Do any of you know the original prop size and pitch? I have a non-original three bladed prop which is rather small diameter, and I believe it is undersized. If I had the original prop info. I could calculate the ideal three blade prop specs. Has anyone have three blade prop specs for our boats?
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M32 prop size? -- Will Beckman, - Saturday - 09/12/09 - 1:00am
Does anyone discover a prop size reccomendation for a M32?
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original prop -- Craig M31-25 Hibou, - Thursday - 09/10/09 - 3:25pm
I have the original 2 blade prop. I seriously doubt I could read any specs on it - its been in the water for 40 years. I could take measurements (its not in the water now). What would you like to know?
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M31 Prop -- Mark M31 (AEOLUS), - Thursday - 09/10/09 - 3:55pm
Bruce, Randall Reeves has a 3 bladed prop on the "Mariners for Sale" page, (although its been there for sometime). He also states he went back to the 12x6 two bladed prop, probably original. You might see what he has to say. How about it Randall???
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2 bladed prop -- Craig M31-25 Hibou, - Thursday - 09/10/09 - 4:06pm
I wouldn't recomment the 2 blade prop. I find that it have enough power at slow speeds to use it to manouver the boat. I find my 58' Hudson , with a 3 blade prop, much more manouverable than the 31' Mariner with its 2 blade prop.
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Three Bladed Prop. -- Bruce, - Thursday - 09/10/09 - 4:30pm
Thanks for all the input. I already have a 3 bladed prop, but it is only about 12" diameter. Unfortunatly, I didn't measure it during my last haulout. I have room for a larger diameter. I don't feel I have the control I want with the current prop. Who has a three bladed prop that they like, an what size and pitch is it? Randall, why did you change back?
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Murre's Prop -- Randall, Murre, M31, - Thursday - 09/10/09 - 8:11pm
Hey Bruce,
Murre has a three blade 12 inch x 6 pitch prop on a 1:1 ratio transmission in a 4108. I know for a fact the tranny is 1:1 because I had a look at the plate when I had the cockpit out--thought I'd taken a picture, but now can't find it.
Some years back I replaced the old 12x6 (it was pink as a rose) to a 13x8 at the recommendation of the local prop guy who said the "engine was rated for 13x8".
I was very happy with the prop at first. LOTS of power, and it took me some time to realize that the prop kept the engine from developing its appropriate rpms. I don't remember the number, but I only got about 2/3rds of the rpm range I'd gotten with the 12x6. I could push the throttle wide open; I'd get plenty of black smoke, but no more rpms.
The Perkins guy I talked to said the 13x8 prop was indeed fine for the engine, but not on a tranny that was 1:1, and that I was damaging the engine by maxing it out at such low rpms.
So I went back to 12x6. If your boat is like mine, 12x6 is plenty and gives you all the control you're going to get on our old boats.
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Thanks for the Information. -- Bruce, - Monday - 09/14/09 - 1:22pm
Thanks for the information, Randall. FYI, I sailed to the annual "Cleat" cruise (est. 1974) this last weekend. I'll tell you more about it later.
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Saw you -- Randall, Murre, M31, - Monday - 09/14/09 - 8:35pm
CONGRATULATIONS!!! I was anchored at Paradise Cove when the "parade" of boats came around Pt. San Pedro and climbed back toward Racoon. Saw Gitana Vela, jib and jigger, clear as day. Beautiful. Seemed you were hauling a** on Jamie's Dreadnaught.
I didn't weigh until 2pm and got beat up by the squalls passing through, not to mention the rain. One minute I'm on my ear, and then nothing. What weird weather.
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Cleat Cruise (Est. 1974) -- Bruce, - Tuesday - 09/15/09 - 12:40pm
Why, thank you Randall. Indeed Jodie's Tahiti Ketch is slow, but she sure is pretty. The wind did pick up once we got past the bridge, so I doused the main as I don't have the reefing lines installed yet. BTW - I was bequeathed the "Cleat" Plaque at the barbaque Saturday night, so you and JoAnne must attend the cruise next year, since I have been bestowed the honor of organizing the Cleat Cruise for next year. It will be end of August, but I have to check the tides when the tide books are published for 2010 to determine the exact date. All other Mariner owners are also welcome to attend. http://www.facebook.com/home.php#/photo.php?pid=30231453&id=1518711799&ref=nf
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