slow cranking starter

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oley340

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Good morning all I have a 1970 340 duster that is giving me grief. The engine turns over very slow even with the plugs out, i have tested the battery checked grounds and replaced the starter, should i replace the starter relay or am i missing something. thanks for any help
 
Can you turn it at the crank with a 1 1/4" socket to see if something isn't holding it back internally?
 
Good morning all I have a 1970 340 duster that is giving me grief. The engine turns over very slow even with the plugs out, i have tested the battery checked grounds and replaced the starter, should i replace the starter relay or am i missing something. thanks for any help
 
The engine turns freely with a socket.
 
Good morning all I have a 1970 340 duster that is giving me grief. The engine turns over very slow even with the plugs out, i have tested the battery checked grounds and replaced the starter, should i replace the starter relay or am i missing something. thanks for any help

Is the ground that's bolted to the starter and goes to the negative battery terminal the same gauge as the power cable that goes to the relay & starter? If you don't have one that fits this description, try installing one. This solved my slow cranking, and my battery is in the trunk.

The starter may only have one of the brushes worn to the point that it isn't touching the commutator in the starter motor anymore. Try switching to a Mopar mini starter is yours is bad.
 
RAM mini starter, best option for a fast kicking starter...and good cables.
 
Stock starter should be more than adequate, you say the battery has been checked but you may try putting another battery that you know his new and hot. You also May check your timing too much initial timing and it will definitely strain your starter I also remember that some ome starter spin faster than others but I can't recall the years or specifications someone else may chime in, if I recall it was after 73 and it was to help start engines with the crappy gas
 
It's a brand new CVR HI TORQUE STARTER
 
You need to check the battery for charge and load test it. Check all main cable connections, and test for voltage drop

When I say "load test" I'm talking about a carbon pile load tester, not a toy you can hold in one hand.

If all that seems OK, replace the starter. A "new" part does not mean "good."
 
That looks like a fancy 1.9Kw Denso mini starter. Should kick even a big block over with ease. I had a stock Denso off a RAM and it kicked over a 451 2x as fast as an old Mopar gear reduction starter. Looking at the specs for a direct drive starter from 1965 states it has a 78A@3800 (no load) RPM...with a ratio of 45:1 at the flywheel, thats only 84 RPM! The gear reduction starter was 3:1 to the flywheel so what would that make the starting RPM, like 29?
 
Use a jumper cable from the battery neg to the block in addition to the std ground cable. See if it helps.

Factory and lots of aftermarket cable might look good, but, are not good at all.
 
Thank you for all your help. the signal wire from the relay to the starter was bad.I replaced it with a # 10 cable and it cranks fantastic and fired right up!!
 
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