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.

PhantomChaos

That sounds about right! Heat kills horse power......

speedygonzalez

there has to be something that can be done to cool the air a chiller fo example.

PhantomChaos

That is why chillers are added....to make more HP

CigDaze

Heat and altitude are both bad for horsepower.

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.

PhantomChaos

What power do you have? I wish I could add 10MPH by adding only 100HP!!

speedygonzalez

It's a 496 ho, and you are absoluitly correct it has to be closer to 200hp to losse 10mph ,ant thats my point do you really loose that much.

CigDaze

600 feet may not sound like much, but the pressure loss is 0.32 psi, or about 2.2%. That may amount to 10 - 15 horsepower.

Add 100+ deg temps, and it gets worse.

Also, without a prop change you now might be well outside of your horsepower peak, which further exacerbates the situation.

I can't tell you exactly how much horsepower your losing, but somewhere in the neighborhood of 50 sounds about right.

By your avatar, it looks like your running a cat......So, not only are you losing horsepower, but the higher temperatures and altitude also drastically reduce the lift produced by your tunnel due to the reduction in pressure, so you're fighting more drag.

It all adds up.

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.