snip

Hi Bob,

I am glad you had fun. I see you can not be convinced, you are
holding on to your hat by any means.

BTW, the formulae in the reference link is a mixture between
Imperial and SI.

For 4-cycle engines the formula more precise would be:
bmep = HP * 12985 / (n * L);  (L = total engine displacement in
litres.) Since Torque is HP / n, bmep is directly proportional to
torque. T (ftlb) = 5252 * hp / n.

Therefore: bmep = T * n * 12985 / ( 5252 * n * L); n cancels out, so
bmep = T* 2.4724 / L.
Or: T = bmep * L / 2.4724.

So 'bmep' is used just to confuse people. It is the same as torque
only different by a constant factor.

When you have negative bmep you have negative torque, meaning the
engine is breaking you vehicle.

BTW, how is you project, the BD-4 coming? I see you are coming
closer to completing it. This must be exciting times for you. I hope
all works out all right and you will be soon up and flying.

Regards
Rolf

Hi Rolf,

On the contrary, I can be convinced.  I just need to see the evidence.
If my calculations had come out differently, I would certainly have
reported it as such.

You're providing me with ancedotal evidence that's contrary to my
personal experience and lessons from high school physics classes.  I
believe the calculations I did were actually biased in favor of your
outcome.  There are no losses taken into account for such things as
acceleration (change in direction), etc.  The calculations are ratios
which elimintates any problem with units.

In fact you have convinced me. I didn't think driving up and down would
be of benefit under any conditions. :)

I'm still making slow progress on the engine installation.  I've been
consulting 4 days/week which provides more money, but less time.  I
still hope to have a running engine in a few weeks.  Thanks for the
words of encouragement.

Bob White

--
http://www.bob-white.com
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