Re: Batteries - EV Conversion

On Sat, 1 Mar 2025 15:51:31 -0700, Bob La Londe <none@none.com99>
wrote:

On 3/1/2025 3:37 PM, Jim Wilkins wrote:

Those horsepower numbers seem exceedingly large. Is it really required?
I'm thinking in terms of 100hp peak, 20hp continuous at most. It
might require a multi-speed transmission, but that's key to efficiency
anyway. Am I overlooking something? A 12 kg LiFePO4 battery can deliver
about a kilowatt for a minute or so. Do you really want 250 of them?
 
bob prohaska
 
---------------------------------------
My 91 Ford Ranger has a 105HP 4 cylinder engine that can barely get it
to 70MPH on flat ground. It was fine around town and for commuting in
bumper to bumper traffic at 50MPH. I bought it for its 7' bed and put up
with the Pinto engine.
 
https://en.wikipedia.org/wiki/Ford_Pinto_engine#Lima_OHC_(LL)
 
"A version with two spark plugs per cylinder, distributor-less ignition,
and reduced main bearing sizes was introduced in the 1989 Ford Ranger
and 1991 Ford Mustang. This engine produced 105 hp (78 kW) and 183 N?m
(135 lb?ft)."
 

>
Jim basically made the same point as my long winded reply.
>
Horsepower is horsepower.  I want to make a surface street work vehicle
out of it.  Around here that means I'll have to do 55 once in a while to
get everywhere around town.  I also want to be able to haul a little bit
with it.
>

Actrually no horsepower is NOT horsepower -

A400 HP cummins will out pull your 400HP Chevy LS - any day of the
week. The torque curve is what you need to look at. How often will you
be running full throttle at 5900 RPM under load to produce the 6.2L
LS3's rated 430HP????
Even at Peak torque RPM of 4600 RPM (425 ft lbs) you are only baking
375 horses - and that's a pretty sophisticated engine.
Work the numbers for a smallblockchevy, or a Mopar small block putting
out 400HP.

 Electric motors are TOTALLY different - particularly dumb as a rock
series wound traction motors that will take all the amps you can give
them at zero RPM and produce INSANE torque - and will draw virtually
NO amps, and produce virtually NO torque at INSANE RPMs

 The generator used as a motor in my FIAT produced about 18HP 36 would
have been quite adequate.  100hp in a ram 1500 would make a nice town
truck with gears, and would not be TERRIBLY painful for short highway
jaunts.

 Find a copy of Paul R Shipps'"WV Engineering Guidebook" for all the
tables to determine the horsepower/performance requirements for ANY
conversion. This was the "bible" for EV conversions in the 1980s.
(3e vehicles, San Diego Ca)

If I was using it as a tractor substitute around the property it might
be different, but I have a tractor already.
>
Having owned a few trucks, all used for work, some rarely going highway
speed, I can't believe I'd want less than 200HP on tap, but if the price
was right I might live with 160ish.
>
>
--
Bob La Londe
CNC Molds N Stuff