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MPH difference huber vs. crashbox???

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Old 12-18-2010, 12:28 PM
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Default MPH difference huber vs. crashbox???

anybody swapped them out and left everything else equal???
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Old 12-18-2010, 04:10 PM
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We did a swap from a velvet 71 c modified with more clutches to a crash box ,it was on a single engine 28 ft boat with a 750 HP BBC blower engine ,we could not see any difference at all ,no rpm /speed gain nothing
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Old 12-18-2010, 04:45 PM
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Originally Posted by stirling View Post
We did a swap from a velvet 71 c modified with more clutches to a crash box ,it was on a single engine 28 ft boat with a 750 HP BBC blower engine ,we could not see any difference at all ,no rpm /speed gain nothing
What was the weight difference?
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Old 12-18-2010, 04:46 PM
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I think its largely reliability that you gain from the crash boxes. Pretty much indestructible.
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Old 12-18-2010, 11:37 PM
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On the Huber side would be dockside manners, on the crashbox side (as GlassDave pointed out) durability. I would think powerboat speeds would remain equal between the two.
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Old 12-19-2010, 01:11 AM
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I have no evidence to back this up but i have been told a normal transmission robs 100hp more from a motor when compared to a crashbox (in this example behind a 950hp blower motor). no idea how that translates to differences in speed
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Old 12-19-2010, 01:52 AM
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Originally Posted by nate View Post
I have no evidence to back this up but i have been told a normal transmission robs 100hp more from a motor when compared to a crashbox (in this example behind a 950hp blower motor). no idea how that translates to differences in speed
I can't see that being the case. To the best of my knowledge a trans usually only eats about 35Hp. Boat transmissions are pretty basic, especially compared to automotive transmissions with multiple gears. You really think a Corvette or Mustang stick has an extra 100hp over an automatic?

Everything I've seen and know suggest that it's only about a 25-35 hp loss to run a transmission. A crashbox is going to eat something, but given that the total loss is 25-35 the difference in Hp loss is going to be minimal.
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Old 12-19-2010, 02:16 AM
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Originally Posted by blackboat View Post
What was the weight difference?
We did not weigh both to see the difference ,but out of my head I think the crashbox is 20-25 lbs less
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Old 12-19-2010, 11:25 AM
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If it has a cooler then there is a power loss,via friction generated heat.
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Old 12-19-2010, 11:57 AM
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Steve 1 - very astute remark

If it makes enough heat to need the oil cooled it's taken some Hp to make that heat - the more cooling the more Hp - good analogy!
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