Real HP loss numbers

[Pat Ford]

On Fri, 12 Mar 1999, Dan Llewellyn2 wrote:

> Date: Fri, 12 Mar 1999 12:52:40 -0500
> From: Dan Llewellyn2 <DanLlwln at ix.netcom.com>
> To: diy_efi at efi332.eng.ohio-state.edu
> Subject: Re: Real HP loss numbers
> 
> I have wondered about this myself.  I have heard anywhere from 15%
> to 25% in drivetrain losses.  What I can't figure out is where the
> energy is going.  If you have a 300HP engine with 25% drivetrain
> loss, then you are losing 75HP somewhere.  Since it doesn't just
> disappear, something has to be soaking up 75HP of energy.  My
> guess is that the loss would be in the form of heat which would
> mean of lot of drivetrain parts would have to be getting really hot
> (assuming the 300HP load on the engine).  Since I have only seen
> my transmission get warm, it doesn't really make much sense unless
> I just haven't had the load on for a long enough period.

diffs and ujoints get pretty warm ( I've seen thermosenors and coolers on 
diffs). If I unlock the front hubs on my tracker there is a slight seat 
of the pants improvement in acceleration

> I wonder sometimes if people don't estimate drivetrain losses on the
> high side because they don't want to admit that their engines aren't
> as powerful as they want them to be.

don't most ads proclaim flywheel hp??

> 
> Dan L
> 
> 
> 

Pat Ford                           email: pford at qnx.com
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