alister667
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| posted on 27/6/10 at 10:07 AM |
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Blade rectifier / overcharging problem.
Hi y'all,
Car developed a bad splutter on the way home from taking photos at Croft
Hillclimb wouldn't rev above 4k. That was a LONG drive home! Eventually twigged the voltage across the battery was too high (16.5V at
tickover rising to 18+ volts at higher revs).
I'm pretty sure this was stopping the ECU getting the correct voltage from the pink wire resistor, cutting the coils.
Obvious rectifier issue, right?
I replaced the rectifier with a unit from ebay, a 954 blade one and spliced it in to do away with dodgy/burnt connectors. 3 yellows -> 3 yellows, 2
greens -> 1 green (earth) and 2 reds -> 1 red (+12V), black wire - NC.
Problem solved?
Nope!
Still spluttering (and frankly if I had a hammer to hand she'd have needed a new bonnet too  )!
I checked the O/Ps from the stator coils - none were shorted to earth and all three read similar AC voltages - 30-50 volts depending on revs. I think
that's normal-ish.
I tried a different battery and that solved it - but the voltage is still +16-17V across the battery when running and I suspect as it charges (and
stops pulling the 12V line down a bit) she'll splutter again, or the battery (now a car unit) will boil.
With the headlights on the voltage drops to +14.5V - I will have them on for my MOT tomorrow - - but I also think running like this all the time
would put unnecessary strain on the rectifier.
I've had a look a few other blade cars and none are running anything like that high a voltage.
Any thoughts? The 954 rectifier looked immaculate although it was 2nd hand.
Many thanks
Ali
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speedystew
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| posted on 27/6/10 at 10:16 AM |
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Hi
is the rectifier getting hot when the engine is running?
if not that would indicate its not working
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alister667
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| posted on 27/6/10 at 10:26 AM |
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It is yes, certainly getting warm.
It is outputting a higher voltage than 12V as the battery as rest reads about 13V, once started that is pulled up.
http://members.lycos.co.uk/alister667/
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speedystew
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| posted on 27/6/10 at 10:29 AM |
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which blade engine is it ?
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alister667
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| posted on 27/6/10 at 10:31 AM |
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It's a 99, 919 on carbs.
http://members.lycos.co.uk/alister667/
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speedystew
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| posted on 27/6/10 at 10:38 AM |
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i would try one of these......
http://cgi.ebay.co.uk/Honda-CBR-900-Fireblade-92-99-Model-Regulator-Rectifier-/170354771772?cmd=ViewItem&pt=UK_Motorcycle_Parts&hash=item27a9e
f873c
the 954 reg/rec may be different as that engine is fuel injected and has different electrical needs (i don't know for certain)
i had exactly the same fault on an 893 blade i used to sprint (boiled the battery etc) and it was the reg/rec
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t16turbotone
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| posted on 27/6/10 at 11:57 AM |
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hi, i would be looking towards the regulator rather than the rectifier, or are they combined on this model?
tony
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alister667
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| posted on 27/6/10 at 12:06 PM |
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Yes the rectifier is combined with the regulator in one unit. Where I refer to the 'rectifier' read 'rectifier /
regulator'.
I'm using the 954 as it was recommended by Andy Bates in a previous thread about rectifiers.
It's a much heavier duty unit. The 919 blade rectifiers have a reputation for going bang, with various symptoms. Just about any bike 3 phase
regulator / rectifier will work, as long as it can handle enough current.
http://members.lycos.co.uk/alister667/
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Jon Ison
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| posted on 27/6/10 at 01:09 PM |
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Where under the bonnet is it fitted ? Is it fitted to a heat sink ?
both these will reflect on how long it lasts.
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alister667
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| posted on 27/6/10 at 01:23 PM |
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Both the old & new rectifiers were directly mounded on a large aluminium plate in front of the engine. I also fitted a chip heatsink to the old
unit. It lasted about 6 years!
The RR connector showed signs of charring when inspected, the main reason I cut it out.
My worry is more about boiling my battery or causing a fire as a wire burns out due to 16.5 Volts across the battery over a long time.
[Edited on 27/6/10 by alister667]
[Edited on 27/6/10 by alister667]
http://members.lycos.co.uk/alister667/
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Jon Ison
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| posted on 27/6/10 at 01:42 PM |
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I put my blade ones on a heat sink on the floor in the engine bay in plenty of cool airflow, blades eat rectifiers, about the only downside to them
though......
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bob
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| posted on 27/6/10 at 02:23 PM |
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I was told once the answer to the rectifier problems on blade engines was to change to a honda super dream 250 or 400 rectifier.
Please dismiss this if its just a load of old tosh but seems most of the blade runners i know do this.
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alister667
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| posted on 27/6/10 at 03:47 PM |
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Of course it's not tosh!
You're right the superdream rectifier is a heavier duty unit, as is the 954 blade one which I've changed to. But the problem is still
present!
16.5V across a battery isn't normal (is it?) and it surely is only a mater of time before the battery goes pop (isn't it?).
http://members.lycos.co.uk/alister667/
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speedystew
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| posted on 27/6/10 at 04:05 PM |
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the reg/rec i put in the link was the same as i changed to with no more problems 
also seen pc fans on top of them,though i never needed to
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Andy B
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| posted on 27/6/10 at 05:00 PM |
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the black wire needs to be connected to ignition switched live supply, the later blade rectifiers are a bit more inteligent than earlier models and
need to see that the power is on to start working, hook it up and it should be fine
regards
Andy
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alister667
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| posted on 27/6/10 at 05:39 PM |
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Thanks Andy!
Cheers
Ali
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alister667
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| posted on 27/6/10 at 05:55 PM |
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quote:
Originally posted by speedystew
the reg/rec i put in the link was the same as i changed to with no more problems
also seen pc fans on top of them,though i never needed to
The problem with mine meant the connector on the loom itself was badly burned and I'd have needed to chop a new connector out of a 'blade
loom then solder it in for a simple replacement to work!
Thanks very much everyone for the help, I'll do the necessary tomorrow and let you know how I get on.
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alister667
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| posted on 28/6/10 at 09:51 AM |
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SOLVED!
Yep, Andy was right, I ran +12V from the coils to the black wire on the rectifier and now the running voltage across the battery is 14-14.5V across
the rev range.
Tried her up the road and she's fine, but of course it started raining for the first time in a couple of weeks!
Andy, many thanks again, if you make it over to Kirkistown some time, the ice creams are on me!
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