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What Ratio with XZ Upper and Sportmaster Lower

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Old 01-19-2003, 04:52 PM
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Default What Ratio with XZ Upper and Sportmaster Lower

would you get ?

I have XZ uppers with 1.36 Gears and want to try the new shorter sportmaster lowers. What ratio would I get with an out of the box bolt up?
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Old 01-19-2003, 05:09 PM
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Depends which of the sportmasters you use, they are avaiable in 15/19, 15/17 and 17/18 ratios. The overall ratio of your XZ (or any drive for that matter) is the upper ratio x the lower ratio.

A 1.36 drive = 29/27 (upper) x 19/15 (lower), so the possible ratios with your upper are 1.36, 1.217 and 1.137

Just like life, no single simple answer
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Old 01-19-2003, 05:15 PM
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Thanks for the help.

A 1.36 drive = 29/27 (upper) x 19/15 (lower), so the possible ratios with your upper are 1.36, 1.217 and 1.137

Is 19/15 stated correctly here as it differs from the way you stated above? What would the poss. ratio's be with 1.5 uppers?

Thanks.

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Old 01-19-2003, 05:27 PM
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Oops,

Yes I reversed the numbers in the lower for the math to work the way I showed. It should have been 19/15, 17/15 and 18/17 in this case as both the upper and lower are reductions.

A 1.5 XZ has a 32/27 upper , possible ratios are 1.5, 1.343 & 1.254

Don't forget that there is also a 30/23 upper, the resulting 1.65 ratio can be worth a few MPH on some boats but it puts a greater torque load on the lower unit
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Old 01-19-2003, 05:46 PM
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Thanks again. This will help me with my project.
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Old 01-19-2003, 06:01 PM
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Default Oh, yea

Sonny, just sell that boat, get one with outboards, then you can run with me next summer.............LOL, what are you up too anyway, blowers?
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Old 01-19-2003, 06:05 PM
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Ask powerboat service , I'm sure they know!
 
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Old 01-19-2003, 06:37 PM
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Mark,

If I remember correctly I was in frony of your the WHOOOOL time at lake Cumberland!

Fixin to go to Florida where it's warm for some testing.

Lyron,

When are you going to quit whining and step and get that new 36
Spectre?
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Old 01-19-2003, 06:47 PM
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You gotta love OSO! SEE YA!

Sonny, you just have to keep the good deals coming so I can afford the 36'

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