Jason Plato Posted July 16, 2007 Share Posted July 16, 2007 🤔 here is C7 TOP Taffia Area Rep Link to comment Share on other sites More sharing options...
AMMO Posted July 16, 2007 Share Posted July 16, 2007 People who spin 'em up too fast? Which one do you have? Ther small 40 amp one seems to be more prone to mishaps than the 50 amp one although even these have been known to go. I have run a bigger alternator pulley on mine since new and have had no issues. With the small 40 amp alternator and the big 80mm pulley you can have charging issues at tickover that I don't seem to have experienced with the 50 amp alternator and same pulley on the road. If you are giving the engine loads of revs then over-revving of the alternator can be an issue.  At 75000 rpm the alternator is turning over 12,000 rpm which seems to be OK. The 50 mm pulley gives 19500 rpm which is too much in my opinion. People disagree with me but then my alternator is still working 😬 AMMO Link to comment Share on other sites More sharing options...
Peter Carmichael Posted July 16, 2007 Share Posted July 16, 2007 Dave, I've run Brise alternators since 2000. Same as Ammo, I have it geared so it doesn't do much at idle. The mode of failure can tell you a lot. If the windings have gone, then you have to wonder where and how it was wound. Regulator failures are "user serviceable" and a good motor factor should be able to supply new regulator packs. As a point of interest, I have found out a fair bit about the supply chain for Brise uprated alternators. They go via several suppliers for winding/assembly etc. including the guy that I use to rebuild my alternators... Link to comment Share on other sites More sharing options...
Jason Plato Posted July 16, 2007 Author Share Posted July 16, 2007 I'm running a 63mm pulley so revs should be oK  the alternator expert just up the road is giving it a look over today ... here is C7 TOP Taffia Area Rep Link to comment Share on other sites More sharing options...
dannylt Posted July 16, 2007 Share Posted July 16, 2007 I think my rectifier pack died from heat - proximity to the exhaust rather than going too fast. Link to comment Share on other sites More sharing options...
MikeE Posted July 16, 2007 Share Posted July 16, 2007 as you know I've had 2 fail this year, first was the windings went on the first one, the 2nd only managed 1 trackday and I'm yet to find out what the problem was with that one. R400 Duratec Build and Modification Pictures here Link to comment Share on other sites More sharing options...
rj Posted July 16, 2007 Share Posted July 16, 2007 Duratec vibrations Link to comment Share on other sites More sharing options...
Rob Walker Posted July 16, 2007 Share Posted July 16, 2007 Dave, I would be surprised if it were revs that killed it, with the 64 mm alt pulley the max the alt will see on your car is 14,500 rpm. Heat should also not be a problem as its mounted on the induction side. If its the electronic regulator or rectifer thats failed within the alt I would look at the wiring harness and the FIA battery cut off switch for a bad connection causing a spike. Rob Link to comment Share on other sites More sharing options...
Dobuy Posted July 16, 2007 Share Posted July 16, 2007 Not sure which Brise one I run (would like to know)picture here. As you can see I run it very close to the Exhaust and in very high ambient temperatures, seems to be OK so far...... Is it true these can be replaced by Diahatsu Charade alternators?? Duratec SV, built in Dubai Link to comment Share on other sites More sharing options...
Peter Carmichael Posted July 16, 2007 Share Posted July 16, 2007 The Daihatsu may need the mount hole drilling out, but will otherwise perform adequately. In a Seven the electrical loads are minimal and the basic Nippon Denso as used in the Charade is fine (40A IIRC). Link to comment Share on other sites More sharing options...
Jason Plato Posted July 16, 2007 Author Share Posted July 16, 2007 today I've found the exact (hope) model and original car fitment @ £79 + vat in place of the £179 from brise/raceline. still awaiting the diagnosis from the sparky chappy Link to comment Share on other sites More sharing options...
Peter Carmichael Posted July 16, 2007 Share Posted July 16, 2007 As long as it fits and spins, that's an alternator that is up to the job. I bought an alternative from a cheapie source and now can't remember which one was Brise and which one wasn't. Word of warning though... it was inattention to pulley alignment when swapping between two alternators which lunched my engine (I might have been trying to gear down the replacement having overheated the first and I certainly possess two pulleys with different alignment, both sourced from Brise). Link to comment Share on other sites More sharing options...
simonbell Posted July 16, 2007 Share Posted July 16, 2007 Mine's on its way out......need to whip it off and see if it can be salvaged. I rev the nuts off my car so tending to agree with Ammo that it needs a larger pulley. I'm also going to move it to the induction side of the engine over the winter.......I don't think the heat is doing it any good either. Simon Bell - Caterham 7 Duratec R I`ve seen the future.....and it`s powered by duratec Check out the website here Link to comment Share on other sites More sharing options...
Dobuy Posted July 17, 2007 Share Posted July 17, 2007 today I've found the exact (hope) model and original car fitment @ £79 + vat What alternator is that Dave?  Simon, how can you tell yours is on the way out, what are the symptoms?  Duratec SV, built in Dubai Link to comment Share on other sites More sharing options...
Jason Plato Posted July 17, 2007 Author Share Posted July 17, 2007 it was inattention to pulley alignment when swapping between two alternators which lunched my engine  you need a duratec Peter , external aux drive belt and no alt belt in cam cover incidents. Dobuy - let me buy one and check it before I post details to save wasting everyones time if its a duffer.  but I will post if its a Link to comment Share on other sites More sharing options...
Jason Plato Posted July 17, 2007 Author Share Posted July 17, 2007 sorry - incase you were asking which model ...... I'm scourcing the replacement for a Raceline inlet side alternator with the markings V905021 on its body and refernce 20272.ALT-5021 on the test document enclosed with the unit when new. Link to comment Share on other sites More sharing options...
AMMO Posted July 17, 2007 Share Posted July 17, 2007 Just found the graph that came with my 50 Amp alternator. It shows that it reaches maximum output at 6,000 alternator rpm. After that the output levels off. My alternator supplier is going to get me the graph for the 40 A version as well but he says that is pretty much the same. No increase in output over 6,000 alternator rpm.  The problem is tickover where the alternator is not spinning that fast and the output is low. Looking at the graph I have approximately 10 Amps at 1,500 rpm alternator rpm and 20 Amps at 2,000 rpm. So you have to play a juggling act to make sure the alternator is spinning fast enough to give you some charge at tickover.  With the 63 mm pulley you have 2.07:1 ratio With the 80 mm pulley it is 1.63:1. This is working with a 131 mm crank pulley. Just a bit more information to help you make an educated decision.   AMMO Link to comment Share on other sites More sharing options...
Dobuy Posted July 17, 2007 Share Posted July 17, 2007 I had this information witten down, don't know how accurate it is, but.. Alternator: Diahatsu 27060-87201 = Lucas  LRB343 From Applause 1.6i 93-98, Chararde(III) 1.3i 93-96 & 1.5i 94-96  Link to comment Share on other sites More sharing options...
Jason Plato Posted July 17, 2007 Author Share Posted July 17, 2007 Dobuy  the alternators on the exhaust side are different to mine on the inlet side . When I broke down the other week MikeE brought his alternator (exhaust side) over and it wouldnt fit.  The one I'm looking at is from a Suzuki car.  I'll post once I have more info etc Link to comment Share on other sites More sharing options...
Dobuy Posted July 17, 2007 Share Posted July 17, 2007 My brise alternator was sourced from Raceline and originally was mounted on the inlet side. However once I had fitted the dry sump it was moved to the exhaust side. Just had to fabricate a mount that worked, which was fairly simple. Duratec SV, built in Dubai Link to comment Share on other sites More sharing options...
Rob Walker Posted July 17, 2007 Share Posted July 17, 2007 Dave, Be advised that some of the small race alternators, have uprated bearings and are safe to take a few more revs.  Rob Link to comment Share on other sites More sharing options...
Jason Plato Posted July 17, 2007 Author Share Posted July 17, 2007 Rob - if the part numbers are cross referencing from the documentation and the numbers on the alternator body to those on a Suzuki car - do you think Raceline or Brise are uprating the bearings ? (meant as a question not critism of brise) Link to comment Share on other sites More sharing options...
Rob Walker Posted July 17, 2007 Share Posted July 17, 2007 Dave, If you are convinced by the blurb on www.brise.co.uk it states that ALL their alternators have heavy duty regulators and uprated bearings. I also read the spec sheet when I collected my alt from Steve Hurst which read much the same, max safe revs 15,500 rpm.  Brise certainly have them apart rotate the field windings, perhaps they fit the uprated bearings whilst its ijn bits. don`t know any more sorry. Do you have a diagnosis yet ????? Rob  Edited by - Rob Walker on 17 Jul 2007 11:00:37 Link to comment Share on other sites More sharing options...
mic Posted July 17, 2007 Share Posted July 17, 2007 Brise fit a grub screw to prevent the field windings vibrating in the case, they also fit a diode to prevent damage to the regulator should the alternator loose its 12v supply, such as when an engine is stopped using the cut off switch, I have spoken to them about max speed in the past and have been told 17500 rpm should be OK. Link to comment Share on other sites More sharing options...
simonbell Posted July 17, 2007 Share Posted July 17, 2007 Mine is begining to whine........... Simon Bell - Caterham 7 Duratec R I`ve seen the future.....and it`s powered by duratec Check out the website here Link to comment Share on other sites More sharing options...
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