lordbenny
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| posted on 9/11/12 at 11:05 AM |
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Cosworth Starter Motor Drawing Too Much Power
Ok, I have another thread running on my starter issue but I need a quick answer to this question:
Will a Cosworth starter motor draw more power than a standard motor. I have a Cosworth one on my 2:0 Zetec Westfield and it seems that the ECU may be
cutting the spark because the starter motor, although cranking over beautifully, may be using up too much power taking the required power below what
is needed for the ECU to work?
Could this problem be solved by simply bolting on a standard motor?
[Edited on 9/11/12 by lordbenny]
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matt_gsxr
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| posted on 9/11/12 at 12:22 PM |
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Is your ECU wired back to the battery?
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lordbenny
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| posted on 9/11/12 at 12:25 PM |
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quote:
Originally posted by matt_gsxr
Is your ECU wired back to the battery?
When you say 'back to the battery' do you mean directly? If so, no, so I pressume the power comes through the starter which is why I have
asked the question re: power drain.
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MikeRJ
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| posted on 9/11/12 at 12:36 PM |
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Simple answer is no, if it's in good condition, especially as the Cosworth YB is a pretty low compression engine. However, it's quite
possible to have a shorted winding with the motor that would cause it to take excessive current.
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MikeRJ
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| posted on 9/11/12 at 12:38 PM |
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quote:
Originally posted by lordbenny
quote:
Originally posted by matt_gsxr
Is your ECU wired back to the battery?
When you say 'back to the battery' do you mean directly? If so, no, so I pressume the power comes through the starter which is why I have
asked the question re: power drain.
He is asking if your ECU power connection goes back to the battery terminal (via relays etc.) rather than to the starter connection. Any voltage drop
across the starter cable will then not affect your ECU.
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snapper
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| posted on 9/11/12 at 12:51 PM |
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Proper Cosworth starter draw more than a Pinto, often used as an upgrade for high compression engines
The biggest issue is usually a bad earth, you need a good thick earth cable from battery to starter mounting bolt and another good earth to the
chassis
The gearbox on a Sierra is also earthed with thick cable from the gearbox central mounting bolt
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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big-vee-twin
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| posted on 9/11/12 at 12:59 PM |
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Have you checked your battery voltage when cranking?
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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lordbenny
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| posted on 9/11/12 at 01:51 PM |
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Just had the battery checked and initially its drawing around 350 amps then down to 300 amps on cranking. Apparently thats a bit to much so Im having
the armature swapped for a freshly wired one. I hope this does the trick.
[Edited on 9/11/12 by lordbenny]
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MikeRJ
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| posted on 9/11/12 at 03:35 PM |
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quote:
Originally posted by snapper
Proper Cosworth starter draw more than a Pinto, often used as an upgrade for high compression engines
A motor will only draw what current it needs for a given load. I very much doubt a Cosworth starter is so inefficient that it draws significantly
more current than a Pinto starter for the same load.
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BaileyPerformance
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| posted on 9/11/12 at 05:24 PM |
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quote:
Originally posted by MikeRJ
quote:
Originally posted by snapper
Proper Cosworth starter draw more than a Pinto, often used as an upgrade for high compression engines
A motor will only draw what current it needs for a given load. I very much doubt a Cosworth starter is so inefficient that it draws significantly
more current than a Pinto starter for the same load.
Mike is correct...
In fact the later cosworth starters are a geared starter, it turns the engine over slightly slower than a pinto starter and pulls less current that a
pinto starter.
Cosworth starters are not really any more powerful than a pinto starter - any starter motor will produce massive torque assuming the battery can
deliver the required current, the way starter motors are wound means it will keep pulling more and more current until the battery voltage falls or it
burns out!
The cosworth starter was developed for smooth cranking, there is no reason to assume a cosworth engine need more energy to start it as it as a
compression ratio of 8.3/1 standard.
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britishtrident
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| posted on 9/11/12 at 05:35 PM |
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Any starter drawing 300 amps will start to give off smoke and then glow.
It is drawing huge current the starter is stalled --- basic DC motor theory.
It is stalled because it is fighting the engine which is trying run backwards because the ignition is over advanced at cranking speed.
If the Engine wants to run backwards it will always beat the starter.
I have a theory that the ignition is because you have a Fiesta or Focus carb CVH ignition system.
[Edited on 9/11/12 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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lordbenny
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| posted on 20/11/12 at 10:19 AM |
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So, after fitting new battery and re-con starter motor how do I adjust my ignition advance when cranking?
Seems that there's too much when I'm trying to start the car as it takes ages to start (that's if the battery dosn't go flat
first!)
It's an MBE ECU. Can the ignition be made to be less advanced when cranking only? Do I need to take it to a specialist?
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