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Author: Subject: Starter motor cable size?
Bigboystoys

posted on 6/8/19 at 07:31 PM Reply With Quote
Starter motor cable size?

Evening all, I want to replace my power cable from my battery to my starter but I'm just wondering what sort of size/amperage cable I require. Engine is a 4.6 Rover v8.
Many thanks

Sam

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gremlin1234

posted on 6/8/19 at 08:04 PM Reply With Quote
get the biggest you can...

what is the cable length from battery/relay/starter?
and don't forget the earth/chassis path is just as important

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Bigboystoys

posted on 6/8/19 at 08:39 PM Reply With Quote
39" from battery to starter motor and yes the earths are clean and good size cable. Thanks Sam
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big_wasa

posted on 7/8/19 at 05:07 AM Reply With Quote
I used 35mm2 on my last one. I will be using 50mm2 on this one. Ford oem looks to be inbetween.
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coyoteboy

posted on 7/8/19 at 08:37 AM Reply With Quote
I've measured compression spikes drawing 185A from my car engine starter, 80-100 on a small bike engine. I would worry less about the current rating (it's short and it will be overridden by....) worry about the voltage drop along it (or more importantly the engine block negative) causing your ground reference to bounce all over. Just buy the fattest you can find reasonably priced.





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furryeggs

posted on 7/8/19 at 04:13 PM Reply With Quote
cheap way of doing it is to buy some 600amp jump cables and cut them to size.
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starterman

posted on 7/8/19 at 05:56 PM Reply With Quote
35mm2 is plenty enough.
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starterman

posted on 7/8/19 at 05:58 PM Reply With Quote
Oh and don't any more than about 15 a metre for any size.
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gremlin1234

posted on 7/8/19 at 07:32 PM Reply With Quote
believe starterman, and if he were to say: go for a high torque/geared starter, believe that too

[Edited on 7/8/19 by gremlin1234]

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907

posted on 8/8/19 at 08:05 AM Reply With Quote
I used 35mm2 copper welding cable on the Lotus engine for both battery leads, starter & earth.

Depending where you get the info from thats 250 or 300 amp.

I also have a geared starter motor.




Most cheap jump leads that I've seen are aluminium wire so be warned if you go this route.
Roger the rep, if you'll pardon the phrase, who I bought my Miller off used to say, "There is no substitute for copper."



Paul G





Member of the Suttol Owners Club, the MX5 Owners Club and the BMMC

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