Interesting Numbers

[david brady]

Fred, Good stuff. The starter on my Series 60 is very similar:



Rated Power: 5KW

Max Torque (zero rpm): 100 ft-lb

Current at Rated: 1200A

Current at locked rotor (zero rpm): 2000A



I have three Group 31 batteries, 1000 CCA each



5KW of mechanical output power form 12KW electrical input power.

Efficiency: 5/12 = 40% Not that impressive, but 100 ft-lbs at zero
rpm is!



David Brady

'02 LXi, NC





On 7/27/2011 3:49 PM, Fred Hulse wrote:

Bob your curiosity is remarkable!! Fred

On Jul 27, 2011 11:58 AM,
"freewill2008" <"sundance101@comcast.net">
wrote:

> The reman starter for my 3208 came with a test
results sheet that has some interesting info:

>

> The max output for this Delco 40MT starter is 5KW or
around 6HP, and about 35FP of torque.

>

> To produce the full 6HP it draws around 1200 amps.

>

> The solenoid draws 80 amps to pull in and 16 amps to
hold.

>

> The starter is apparently designed to run at 1500RPM.
If it gets loaded down to 750RPM the amp draw increases to
around 1700 while producing only 5HP.

>

> Clearly the 3208 does not need 6HP/1200 amps to start
because mine will start fine with a cranking battery rated
at only 650 cold cranking amps. The battery I normally use
is rated at 950 CCA.

>

> For those who just HAD to know

>

> Bob Griesel '84 FC31 WLII WA

>