Interesting Numbers

[freewill2008]

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

[Fred Hulse]

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
>

[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

>