John Bonnett
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| posted on 5/6/08 at 02:12 PM |
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Starter Motor help please
I think I need a more powerful starter motor.
Every so often, the starter will not turn over the engine. It doesn't happen every time and more often when it does, the engine is hot. The
starter I have is a new one as are the 075 battery and 70 Amp alternator. Compression on my engine is 13.5:1.
I'm running an RS2000 pre-engaged starter motor and wonder if, for example, there is an interchangeable starter motor for a diesel that would
have a bit more power.
I'd be grateful for any help here.
Thank you very much
John
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r1_pete
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| posted on 5/6/08 at 02:16 PM |
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Sounds like the ignition is a tad too advanced, causing the charge to be fully burning just before TDC and trying to push the piston back down. Once
running the momentum of the reciprocating components overcomes this.
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John Bonnett
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| posted on 5/6/08 at 02:22 PM |
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quote: Sounds like the ignition is a tad too advanced, causing the charge to be fully burning just before TDC and trying to push the piston back
down. Once running the momentum of the reciprocating components overcomes this.
No it's not that. I've installed an independent switch for the starter and when the engine is spinning, I turn on the ignition. This helps
but occasionally I still get the problem.
John
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Mix
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| posted on 5/6/08 at 04:56 PM |
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This post has just brought back memories of decompression levers on old large singles, (motorbikes.....before the slant eyes took over) 
Mick
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britishtrident
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| posted on 5/6/08 at 05:31 PM |
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It might be an ideal to do cranking voltage test --- look for about 10.5 volts across the battery when cranking a warm engine with the ignition
off.
13.5:1 compression is really way on the high side particularly if you aren't running a full race cam.
[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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John Bonnett
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| posted on 5/6/08 at 05:37 PM |
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quote:13.5:1 compression is really way on the high side particularly if you aren't running a full race cam.
No this is a properly built n/a Cosworth race engine with all the right bits.
I've just spoken to Burton and their suggestion is a geared starter which I was hoping to avoid.
John
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rusty nuts
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| posted on 5/6/08 at 06:29 PM |
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Remember reading in CCC magazine years ago, possibly an article by David Vizard that a lot of hot rod racers used a starter from an automatic as they
have more cranking power.
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mookaloid
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| posted on 5/6/08 at 07:59 PM |
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A slightly cheaper tham burton's geared starter
here
Cheers
Mark
"That thing you're thinking - it wont be that."
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John Bonnett
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| posted on 6/6/08 at 01:18 PM |
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Thank you for your replies, particularly mookaloid. I have contacted the Ebay seller and he tells me that it is a pre-engaged starter which is what I
need and it does sound as if it is the solution to the problem and as you say a lot cheaper than from Burtons.
Thank you once again
John
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02GF74
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| posted on 6/6/08 at 08:00 PM |
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you do not say what battery you have fitted.
a small capacity battery is not doing you any favours helping to start the engine.
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John Bonnett
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| posted on 6/6/08 at 09:04 PM |
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quote from original message:Every so often, the starter will not turn over the engine. It doesn't happen every time and more often when it
does, the engine is hot. The starter I have is a new one as are the 075 battery and 70 Amp alternator. Compression on my engine is 13.5:1.
The 075 battery will start a 2 litre diesel.
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David Jenkins
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| posted on 6/6/08 at 09:08 PM |
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John,
I have one (OK, two) dumb question(s), and I'm quite sure that you've got it covered but...
a) How thick is the cable from the battery to the starter?
b) How thick is the engine earth strap?
c) Have you checked the connections and the earthing?
(Damn! 3 questions!)
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John Bonnett
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| posted on 7/6/08 at 07:57 AM |
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Hi David
I've checked that there is no voltage drop at the starter and the earth strap is battery cable with sound connections at either end. The cables
are the heavy duty type.
I've done a bit of checking and I think this is not uncommon for this engine hence the need for and availability of geared starters.
The strange thing is that it does not do it every time and seems to happen if you try to restart after stallling; the very time when you need to cover
your confusion with a quick restart!!
If the situation doesn't get any worse I'll stick with what I've got because it has always started, in the end.
atb
John
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