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Strange loss of power...
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backfire
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Joined: 14 Nov 2007
Posts: 346
Location: NL, 's-Hertogenbosch

PostPosted: Wed Jan 28, 2009 6:42 pm    Post subject: Reply with quote

drums, even worse, you didn´t leave the park break on or adjusted it a little bit to tight? We had this with a dyane from my brother in law, loss of power, no top speed, got very very hot. After a while the heating tubes catcht one fire Evil or Very Mad
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Bart
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Joined: 17 Jun 2007
Posts: 783
Location: Södertälje

PostPosted: Wed Jan 28, 2009 7:15 pm    Post subject: Reply with quote

Harley wrote:
so a little confusing that it would overheat running a little rich like that.
I that case I would dubble dubble check my ignition. As either or is causing the overheating, if my thinking is right....

I have no idea how ignition timing and advance could go wrong at higher revs.
Anybody? could it be a coil which isn't good enough for high revs...?

Good luck!
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Harley
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Joined: 26 Nov 2007
Posts: 394
Location: Braidwood - Australia

PostPosted: Thu Jan 29, 2009 2:22 pm    Post subject: Reply with quote

Checked Brakes are ok,

Also checked the Valve lift, equal on all valves... Valve timing is also correct, Piston at TDC with valve rocking...

Need to check the ignition advance with a strobe light.

Valves where a bit tight, maybe, i'll drop the oil and replace the filter tomorrow and see if i'm anywhere closer to solving the problem...

Harley
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Lionel
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Joined: 11 Jul 2007
Posts: 258
Location: NANTERRE-PARIS suburb-FRANCE

PostPosted: Thu Jan 29, 2009 3:31 pm    Post subject: Reply with quote

Bartje wrote:


I have no idea how ignition timing and advance could go wrong at higher revs.
Anybody? could it be a coil which isn't good enough for high revs...?

Good luck!


One time I changed one of the tiny bolt inside the ignition box by a longer one (the one that hold the moving point, if Iremember well) because it was a bit damaged and I had no other. It hit the backing plate, making a little bump in it, that in turn block the displacement of the moving mass of the centrifugal advance... Rolling Eyes
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dyanut
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Joined: 05 Aug 2007
Posts: 177
Location: North Yorkshire

PostPosted: Sat Jan 31, 2009 12:18 am    Post subject: Reply with quote

Hi Harley,
that's the _only_ way to check the timing imho, at full advance using a strobe.
For 9.0:1 pistons with 98 octane fuel it usually needs to be 'around' 33 degrees BTDC, but with higher CR pistons or lower octane fuel the total advance will need to be less.
Ignition which is retarded from the ideal results in power loss and overheating, but I guess you already knew that... Wink
I did find a 123 unit which gave 10 degrees less total advance than it should, but Albertronics kindly exchanged it for one with the correct amount of advance.
Ken


Harley wrote:

Need to check the ignition advance with a strobe light.


Harley
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Harley
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Joined: 26 Nov 2007
Posts: 394
Location: Braidwood - Australia

PostPosted: Sat Jan 31, 2009 1:11 pm    Post subject: Reply with quote

FIXED?

How? NO IDEA!

I did an oil and filter change, adjusted the tappets (slightly, again), tried a different set of magnets for the 123 Rolling Eyes ...
Could it have been the oil??? not more than 2months old and the sump plug magnet was spotless...

Back on the road Twisted Evil

Thankyou everyone for your help and ideas, i now know my 2cv so much better! and i am glad it had nothing to do with the efi mods i made Very Happy as everyone suspected Laughing


Harley
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Jasu
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Joined: 30 Sep 2007
Posts: 211
Location: Finland

PostPosted: Sat Jan 31, 2009 2:20 pm    Post subject: Reply with quote

Too much oil..? Rolling Eyes

It can make loss of power...
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