02-02-2022, 07:45 AM | #1 |
Not Yet Wild
Join Date: Jun 2021
Posts: 14
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Gear ratio question and stock rear end strenth
Hi,
I am nearly finished my 1993 ezgo marathon to farm vehical conversion. I have put a 250cc Chinese quad engine with reverse, which I originally mated with a live quad axle that had a gear ratio of 3.66:1. This was nearly impossible to drive because the gearing was too tall and it wouldn’t go up hills. It’s a manual transmission and the clutch was hating it. I have bought the biggest rear and smallest front sprockets that would fit and it’s still horrible to drive. Has anyone used the stock Dana differential/axle for a conversion like this. The engine is 11.5kw @6500rpm, which is a lot more than the 2.5hp stock electric motor that revs to 2800rpm. Would the stock axle be able to handle this extra stress? If so could I weld the diff for extra traction? I have read the gear ratio is 10.5:1 on these rear ends. The quad engine gear ratios range from 2.909-0.9545:1. I plugged some calculations into a spread sheet and worked out that 1st gear would travel roughly 13mphr @6000rpm and 5th gear would go 39mphr on 22” tires. I am wondering If this sounds correct and would this be suitable for a farm application. I will be using a jack shaft / output shaft extension so I can change this gearing if needed. Thanks for your help. BiPolarBear is offline Report Post |
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02-02-2022, 08:38 AM | #2 |
maintaining a low profile
Join Date: Oct 2009
Location: SW Virginia USA
Posts: 6,316
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Re: Gear ratio question and stock rear end strenth
11.5 kw = 15+ hp. A built Vanguard V-Twin has a lot more. I don't see a problem with the hp.
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02-02-2022, 01:56 PM | #3 |
Not Yet Wild
Join Date: Jun 2021
Posts: 14
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Re: Gear ratio question and stock rear end strenth
Thanks do the higher rpm’s cause any issues
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02-03-2022, 08:48 AM | #4 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,441
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Re: Gear ratio question and stock rear end strenth
Looks like you have two identical threads here. I commented on the other one.
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