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can havasu heat kill speed ?

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Old 07-13-2006, 05:24 PM
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Default Re: can havasu heat kill speed ?

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Originally Posted by speedygonzalez
Havasu I was told it's about 600ft above see level, thats not to bad, 10mph is like loosing almost or 100hp thats alot.
All you have to do is talk to a pilot and he can explain density altitude for you. Even though havasu might only be at 600 ft. above sea level, the heat will act as if you are much higher above sea level than you actually are. Hot temps are the result of thin less dense air that will not allow your engine to make peak hp. It also has the same effect on the wing of an airplane as far as lift is concerned. Ten miles an hour sounds about right depending on the boat.
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Old 07-13-2006, 05:30 PM
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Default Re: can havasu heat kill speed ?

air density= less hp

hot air is less dense
altitude less dense

less air to compress affect torque
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Old 07-13-2006, 05:32 PM
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Default Re: can havasu heat kill speed ?

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Originally Posted by chad1
How Many Rpm Are You Turning
How Many Before The Heat.
What Is The Rpm Range For Peak Hp On A 496.
Loosing 350 Rpm Is Normal In Extreme Heat.
I just bought the boat in May it has a bravo 28 and in May it only turnned 3800rpm, reproped to a 24 and got to 4400rpm. I was just out this week it 110 with out trimm I was turnning about 4200rpm 2 persons and about 60gl of fuel. 496ho is supposed to run best @4800rpm.
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Old 07-13-2006, 05:40 PM
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Default Re: can havasu heat kill speed ?

Turn around and go down river

Seriously though, there is also less density in the fresh water so your boat will lose speed in the fresh water too so that is another factor along with the heat.

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Old 07-13-2006, 05:44 PM
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Default Re: can havasu heat kill speed ?

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Originally Posted by BADA BING
Turn around and go down river

Seriously though, there is also less density in the fresh water so your boat will lose speed in the fresh water too so that is another factor along with the heat.

Jimbo
I have gone down to parker its not that much difference.
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Old 07-13-2006, 06:55 PM
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Default Re: can havasu heat kill speed ?

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Originally Posted by CigDaze
Heat and altitude are both bad for horsepower.
yup 900 ft, starts to get thinnnnnnn.
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Old 07-13-2006, 08:28 PM
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Default Re: can havasu heat kill speed ?

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Originally Posted by speedygonzalez
Has anyone experinced speed loss due to the high heat at Lake Havasu ? I've been told that my boats loss of almost 10mph is due to the heat . I've had the motor looked at and it has no codes, it just does'nt sound possibe, is it.
That's why we always do our speed runs on the weekend of the Christmas Parade of Lights. Havasu I believe is also at 540 feet normal pool level. It also sounds like you need to get/test another prop.
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Old 07-13-2006, 09:02 PM
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Default Re: can havasu heat kill speed ?

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Originally Posted by LakeRacer
That's why we always do our speed runs on the weekend of the Christmas Parade of Lights. Havasu I believe is also at 540 feet normal pool level. It also sounds like you need to get/test another prop.
I have bought a 24 bravo one, I'm still 400rpm short so I have to borrow a 22 bravo one and see what happens. But it looks like I have to spend more $$$$$$$ to get to 70-80 mph. I'ts e deck boat so that shuold be plenty beacause 60mph is not going to cut it. As it is only one insurance co will insure this cat anyway because they are supposed to be fast might as well maket a bit faster.
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Old 07-13-2006, 10:04 PM
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Default Re: can havasu heat kill speed ?

10 MPH sounds like a lot. Early and late in the season I run in temps in the 50's, low humidity. Then July/Aug. temps are 90+, high humidity. Top speed difference is less than 5 MPH.
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Old 07-13-2006, 10:41 PM
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Default Re: can havasu heat kill speed ?

I have never seen more than about 2 or 3 mph difference in speed in 60 to 100 degree weather. I boat on Lake Norman, NC at 760FASL and run Ilmors. I actually can not tell the difference in heat. And we really have some high humidity.
I know that when I ran a blower motor I could really tell a difference.
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