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11-08-2012, 11:10 PM | #1 |
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Location: Yo mamma's house.
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3 to 1 gears... how much faster?
So how much speed to do really gain with the 3:1 gear set for the rear axle vs a stock rear axle at say 30mph??
I'm planning on adding brakes, aux tranny, high comp head, and better breathing manifolds to my go job and wonder if the 3:1 gears would do all that much... or if I should just spend the $300 on something else...
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11-08-2012, 11:29 PM | #2 |
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Re: 3 to 1 gears... how much faster?
30MPH is 30mph. ,so none at all.
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11-09-2012, 07:10 AM | #3 |
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Re: 3 to 1 gears... how much faster?
Lets try this again.... all things being constant, ie: driveshaft RPM, how much more speed do the 3:1 gears give?
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11-09-2012, 08:24 AM | #4 |
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Re: 3 to 1 gears... how much faster?
If you do the math, 3:1 is a 21% higher ratio than the standard 3.63:1. So all other things being equal, the same rpm at the driveshaft that produced 30mph with the 3.63:1 will give you 36.3mph with the 3:1
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11-09-2012, 08:56 PM | #5 |
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Re: 3 to 1 gears... how much faster?
If you have a roadster or speedster this is fine, but those gears are not the best for most other body styles, because the weight of the body, plus the passengers can give you a very slow start up.
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11-10-2012, 11:14 PM | #6 |
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Re: 3 to 1 gears... how much faster?
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Chris Paulsen McPherson, KS |
11-11-2012, 12:06 AM | #7 |
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Re: 3 to 1 gears... how much faster?
We have a 1915 Touring car with 3:1's in the rear. It has a Ruxstell and I use it like a 4spd. and love it.
It also has a slight touring cam and the high compression pistons from Egge Machine. This car really runs. |
11-11-2012, 10:14 AM | #8 |
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Re: 3 to 1 gears... how much faster?
As others have already said, unless you have a light car with a very strong engine and keep away from long steep hills you'll probably regret changing the rearend to 3:1.
Perhaps consider a Warford, which in overdrive with a standard 3.63:1 rearend gives you 3:1
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11-11-2012, 06:05 PM | #9 | |
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Re: 3 to 1 gears... how much faster?
Quote:
Its pretty flat around here, small bridges that go over the highway are the only hills we have!
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11-11-2012, 06:22 PM | #10 |
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Re: 3 to 1 gears... how much faster?
Jack,i have a set of Ac brakes on a ruckstal and like them.
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11-12-2012, 07:03 PM | #11 |
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Location: Madras Oregon
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Re: 3 to 1 gears... how much faster?
I have a 3 to 1 Ruckstell in my 27 roadster. When I 1st got the car it was it it and with the stock cyl head it was a constant battle to keep any speed up. I switch to a 3.63 and it was much better. Since then I put a Z high compression head on it and when the 3.63 broke I put the 3 to 1 back in. Wow what a wonderful difference! Much smoother running car. We have lots of hills and it usually pulls them fine. However.....I have purchased a 12 tooth pinion which will make it 3.25 or 3.33 depending on which ring gear (39 or 40 tooth) I decide to run. I think it will be a little better overall, especially when running around with a bunch of other 3.63 geared cars. My next step though is a Rocky Mountain 3 speed aux. tranny I have that mounts just in front of the rear end and replaces the driveshaft too. I also am running AC acc. rear brakes. They work great too. The 3 to 1 will probably end up in my 15 speedster.
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