starter amp ???

FED 387 · 09-20-2012, 04:02 PM

anyone know off hand what the amperage draw is for a typical SBC mini starter---- not an OEM one but those Hitachi/Nippondenso motored ones that Jegs/Summit sells---thanx FED387

John Dinkel · 09-20-2012, 10:17 PM

About 200-250

Tom keedle · 09-21-2012, 05:23 AM

Quote:

Originally Posted by John Dinkel

About 200-250

really?
that seems awful high for a gear reduction starter..
guess i'll have to check mine if and when it ever gets a battery hooked up to it.

Bill Harris · 09-21-2012, 08:53 AM

Those starter are usually 1.4KW (around 1.9HP). At 746 Watt/HP, Mr Ohm sez that with a 12V battery it takes 116.67 Amps to dissipate 1400 Watts. That, of course is at 100% efficiency. If you assume a 70% efficiency the starter will draw about 152 Amps at rated output. The mini-starters use permanent magnets for the field so they draw a lot less current than the old style wound field (electromagnetic) starters which draw a lot of current just to create the static field.

Note the importance of having really good cabling and connections between the battery and the starter. If you drop voltage across the cabling, the amperage will go up quickly. If you only supply 10V to the starter due to drops or insufficient battery capacity, the amperage will go up to 182 Amps to get rated output from the starter. This is a vicious circle since as more current is drawn, more voltage is dropped across the resistive cables/connections so the voltage at the starter goes down, the current tries to go up.... and so on.... leading to the dreaded "click-----nothing".

Sorry for the lecture.. I'm bored....

FED 387 · 09-21-2012, 10:29 AM

BILL---OK so based on your info what would be the smallest battery Amp hr or CCA or whatever would be needed to use this starter with a #6 cable with a maximum total length of about 48 inches probably closer to 36----all new stuff connectors ,cable , eye rings etc.---just trying to determine what is the smallest that will work satisfactorily-----can always get a larger battery if needed just trying to see what is the smallest for now-----any other suggestions you can make??--- is the battery/starter cable tthe correct size to big too small just right?? your thoughts please---yes,weight is a consideration here too---thanx FED387

Run to Rund · 09-21-2012, 11:05 AM

I suggest you check on yellowbullet.com and look at the wire sizing chart:
http://www.yellowbullet.com/forum/sh...ad.php?t=47266
it looks llike 4 gauge would be better. I use 1 gauge for the 3' to my RobbMc mini starter from the junction block because too big won't hurt, and the junction is 24' from the battery (2/0 to the junction from the battery). Also, the initial surge needed may be a lot more than the running amps.

Altronics · 09-25-2012, 06:17 PM

16 volt lithium technology alllows for easier starting and much more stable voltage to supply ignition and pumps throughout the entire or multiple runs. They do not droop like a lead battery.

Ed Wright · 09-25-2012, 08:16 PM

Fred, what do they sell for?

Altronics · 09-26-2012, 10:11 AM

Quote:

Originally Posted by Ed Wright

Fred, what do they sell for?

Our website www.altronicsinc.com has complete info and pricing.

THey start at $999 - includes charger.

Feel free to give me a call to discuss the correct battery for your application.

09-20-2012, 04:02 PM	#1
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,400 Likes: 482 Liked 320 Times in 172 Posts	starter amp ??? anyone know off hand what the amperage draw is for a typical SBC mini starter---- not an OEM one but those Hitachi/Nippondenso motored ones that Jegs/Summit sells---thanx FED387

09-20-2012, 10:17 PM	#2
John Dinkel Senior Member Join Date: Nov 2005 Location: Pinckney, Michigan Posts: 507 Likes: 394 Liked 261 Times in 68 Posts	Re: starter amp ??? About 200-250 __________________ John Dinkel 3295 STK

09-21-2012, 08:53 AM	#4
Bill Harris Member Join Date: Mar 2002 Location: Ooltewah, TN Posts: 421 Likes: 13 Liked 26 Times in 13 Posts	Re: starter amp ??? Those starter are usually 1.4KW (around 1.9HP). At 746 Watt/HP, Mr Ohm sez that with a 12V battery it takes 116.67 Amps to dissipate 1400 Watts. That, of course is at 100% efficiency. If you assume a 70% efficiency the starter will draw about 152 Amps at rated output. The mini-starters use permanent magnets for the field so they draw a lot less current than the old style wound field (electromagnetic) starters which draw a lot of current just to create the static field. Note the importance of having really good cabling and connections between the battery and the starter. If you drop voltage across the cabling, the amperage will go up quickly. If you only supply 10V to the starter due to drops or insufficient battery capacity, the amperage will go up to 182 Amps to get rated output from the starter. This is a vicious circle since as more current is drawn, more voltage is dropped across the resistive cables/connections so the voltage at the starter goes down, the current tries to go up.... and so on.... leading to the dreaded "click-----nothing". Sorry for the lecture.. I'm bored.... __________________ Bill Harris ex 2172 STK ex 2272 S/S

09-21-2012, 10:29 AM	#5
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,400 Likes: 482 Liked 320 Times in 172 Posts	Re: starter amp ??? BILL---OK so based on your info what would be the smallest battery Amp hr or CCA or whatever would be needed to use this starter with a #6 cable with a maximum total length of about 48 inches probably closer to 36----all new stuff connectors ,cable , eye rings etc.---just trying to determine what is the smallest that will work satisfactorily-----can always get a larger battery if needed just trying to see what is the smallest for now-----any other suggestions you can make??--- is the battery/starter cable tthe correct size to big too small just right?? your thoughts please---yes,weight is a consideration here too---thanx FED387

09-25-2012, 06:17 PM	#7
Altronics Sponsor Join Date: Dec 2010 Posts: 92 Likes: 0 Liked 63 Times in 11 Posts	Re: starter amp ??? 16 volt lithium technology alllows for easier starting and much more stable voltage to supply ignition and pumps throughout the entire or multiple runs. They do not droop like a lead battery. __________________ Fred Bartoli 847-923-0002

09-21-2012, 11:05 AM	#6
Run to Rund Senior Member Join Date: Sep 2007 Location: Henderson, NV Posts: 583 Likes: 8 Liked 54 Times in 27 Posts	Re: starter amp ??? I suggest you check on yellowbullet.com and look at the wire sizing chart: http://www.yellowbullet.com/forum/sh...ad.php?t=47266 it looks llike 4 gauge would be better. I use 1 gauge for the 3' to my RobbMc mini starter from the junction block because too big won't hurt, and the junction is 24' from the battery (2/0 to the junction from the battery). Also, the initial surge needed may be a lot more than the running amps.

09-25-2012, 08:16 PM	#8
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 169 Posts	Re: starter amp ??? Fred, what do they sell for? __________________ Ed Wright 4156 SS/JA