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Old 01-17-2010, 10:05 AM
jackel jackel is offline
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Default starter motor power

my brother and i are building karts, the first is coming along well,
starter motor powered with a planetary geared nissan unit at about 1.4Kw, it should be well suited as it is all steel gears and has no nose cone,
I have most of the bits i need and have spent about $40-$50 so far.
I am an auto electrician so i know my way around a starter motor but i have never attempted to modify one for constant or prolonged use before, the biggest issue is going to be cooling, anybody had joy in this area??
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Old 01-17-2010, 11:39 AM
rdenis rdenis is offline
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If your starter motor has no bearings, bushings and its armature is wound coil rather than permanent magnet, its probably going to be impossible to get this to work the way you want.

However, what are your planned mods to the motor? (Nitrogen cooling an unmodified starter motor might work).
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Old 01-17-2010, 11:43 AM
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1992suburban 1992suburban is offline
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my starter draws almost 200 amps while crankin my truck
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Old 01-17-2010, 06:31 PM
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jackel,
Bar stool racers use gear reduction jap starter motors. You'll prolly find all kinds of info in this search link:
http://www.google.com/search?sourcei...+starter+motor
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Old 01-17-2010, 06:53 PM
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You could try cutting up some computer headsinks, get them going around the outside of the starter motor, then set up a small fan to constantly cool them off.
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Old 01-18-2010, 04:06 PM
jackel jackel is offline
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its permanent magnet with a bearing in the front housing where the drive is supported. the armature and planetary gears are brass bushed but they dont take the load and will be fine.
I have swisss cheesed the rear housing and the magnet housing to the extent of near structural integrity loss.
nitrogen is inert but expensive to circulate and contain, sorry but not that complicated a sort o guy.
would the heat sinks work better than direct air flow???
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Old 01-18-2010, 04:07 PM
jackel jackel is offline
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its permanent magnet with a bearing in the front housing where the drive is supported. the armature and planetary gears are brass bushed but they dont take the load and will be fine.
I have swisss cheesed the rear housing and the magnet housing to the extent of near structural integrity loss.
nitrogen is inert but expensive to circulate and contain, sorry but not that complicated a sort o guy.
would the heat sinks work better than direct air flow???
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Old 01-18-2010, 04:37 PM
jackel jackel is offline
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you are right about the jap reduction gear starters anderkart, they are all bearing internals and would cope with the rigers of constant operation in that respect, the armature spinns at mutch higher rpm though so i would like to see it tried and tested before i go down that road, i will take a look at the link later, cheers for that.Off to work now have got a starter to rebuild (love irony) and a short in a vectra (opel).
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