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Thread: Which Lower/gear to use?
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08-16-2022, 01:59 PM #15000 RPM
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Which Lower/gear to use?
So I want to have a lower unit coned to run on the Viper I'm re-coring for next season. I currently have three to choose from, small bullet off an XR6 (1.78), a 1647-9147-C (1.87), and a 1647-9147-C1 (2.00) and pretty sure they all ratchet. I read on here Texas suggests the C1 is the best fishing case to cone but what are the pros and cons of the different gear ratios?....Thanks.
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08-16-2022, 02:16 PM #26000 RPM
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need to know what kind of power? race, ski, light loads/ gen. use?
Last edited by KIRCHNER; 08-16-2022 at 02:18 PM.
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08-16-2022, 03:11 PM #3
Stock XR6 is not as durable for long river runs. Drag racing they are good if shimmed correctly, but not very many have success putting lots of hours river running on them. The 9147C and C1 cases are both big bearing and good cases. C1 has zincs on the sides. I would go with the 1.87 ratio cause props will be more readily available (lower pitch)
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08-16-2022, 03:18 PM #4
Are not all 1647-9147 big bearing? C, C1, Cwhatever?
1973 Viper - sold
1978 Viking - sold
1995 XB02
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08-16-2022, 03:20 PM #51973 Viper - sold
1978 Viking - sold
1995 XB02
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08-16-2022, 04:55 PM #6
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08-17-2022, 07:32 AM #7
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08-17-2022, 10:07 AM #8Member
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i went from a 2:1 to a 1.87 on my vector with a carbed motor and gained around 9mph with plenty room to play with. IMO i'd stay away from 2:1 unless you're drag racing. also like 25 said, the xr6 cases are not as durable for river running.
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08-17-2022, 10:13 AM #9Member
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08-17-2022, 10:46 AM #105000 RPM
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Did you have Bob's cone the case??....I've read on here that there have been some issues with recent jobs they've done.
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08-17-2022, 10:48 AM #11Member
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08-17-2022, 11:16 AM #125000 RPM
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Cool thanks.
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08-17-2022, 03:51 PM #13
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08-17-2022, 06:51 PM #145000 RPM
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same Ronnie that had the crazy fast Viper I've seen videos of?....think he's in NY?
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08-17-2022, 07:39 PM #15
Yes, Long Island. https://www.facebook.com/search/top?...%20fabrication
Living in the Freedom provided by Bud Conner and his fellow warriors.
R.I.P. my Heathen Brother
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