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JoZeF Grave Digger
Joined: 25 May 2007 Posts: 1734
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Posted: Sun Jan 30, 2011 4:16 pm Post subject: |
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Ok ! must be someone else then _________________ "That bumper fits there like sunglasses on pig" O.E.
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Bart Lowered
Joined: 17 Jun 2007 Posts: 783 Location: Södertälje
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Posted: Sun Jan 30, 2011 5:01 pm Post subject: |
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tbh, I don't know myself what caused it, al of a sudden the problem was there...
The cam wheel was put back on correct when we changed timing and the engine did some 40000k.
In the end I recon it is fatique of material. _________________ I like to play |
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JoZeF Grave Digger
Joined: 25 May 2007 Posts: 1734
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Posted: Sun Jan 30, 2011 5:08 pm Post subject: |
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Yeah I guess some parts are just not as strong as their fellowmates. _________________ "That bumper fits there like sunglasses on pig" O.E.
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Bart Lowered
Joined: 17 Jun 2007 Posts: 783 Location: Södertälje
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Posted: Sun Jan 30, 2011 5:33 pm Post subject: |
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What do you mean?
Normally the camwheel is not quite the weakest link in the valve train.. _________________ I like to play |
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JoZeF Grave Digger
Joined: 25 May 2007 Posts: 1734
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Posted: Sun Jan 30, 2011 5:56 pm Post subject: |
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Well if nothing else broke in the engine, causind this part to break, it means i guess that this part had a weakness that you don't usually get in the camshaft of a 2cv engine _________________ "That bumper fits there like sunglasses on pig" O.E.
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Bart Lowered
Joined: 17 Jun 2007 Posts: 783 Location: Södertälje
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Posted: Sun Jan 30, 2011 8:08 pm Post subject: |
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yeah okay, I should have been able to understand the the 'fellowmates' straight away... _________________ I like to play |
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Etienne Hoodrider
Joined: 25 May 2007 Posts: 2829
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Posted: Mon Jan 31, 2011 1:17 am Post subject: |
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It's really amazing ! _________________ www.super2cv.com |
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sivipas Snailer
Joined: 17 Oct 2007 Posts: 99
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Posted: Mon Jan 31, 2011 8:33 am Post subject: |
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sometimes the springs that hold two halves of cam gear can break and get in the way of gears and cause everything to break (though I see on your photos that at least two springs are intact). it happened to me, so an old citroen mechanic explained this as a probable cause. |
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dyanut Dropped
Joined: 05 Aug 2007 Posts: 177 Location: North Yorkshire
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Posted: Mon Jan 31, 2011 2:24 pm Post subject: |
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Bart,
in 30 years of working with A series engines, I've only seen this happen on 3 engines.
On 2 of those, the broken camwheel had done so much damage to the gear on the crankshaft that it wasn't usable any more.
The failure seems to be triggered by failure of the rivets or springs which hold the 'scissor' gears together, so it's always worth having a good look at those when you have an engine apart...
Out of interest, how did you remove and re-fit the gear assembly on the camshaft?
Hydraulic press or axle stand and big hammer? ;o)
Ken |
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Bart Lowered
Joined: 17 Jun 2007 Posts: 783 Location: Södertälje
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Posted: Mon Jan 31, 2011 4:24 pm Post subject: |
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dyanut wrote: | Out of interest, how did you remove and re-fit the gear assembly on the camshaft?
Hydraulic press or axle stand and big hammer? ;o) | I used a hydraulic press.
Axle stand and big hammer, how is that supposed to work? Wouldn't one damage the wheel and shaft and how do you then get the wheel back on straight? _________________ I like to play |
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dyanut Dropped
Joined: 05 Aug 2007 Posts: 177 Location: North Yorkshire
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Posted: Mon Jan 31, 2011 4:46 pm Post subject: |
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Bart,
it was done by someone you will probably have met, as they owned a Barbour 4x4.
They were also one of the most successful competitors in the 2CV racing scene back in the 90s.
Best say no more, as altering camshaft timing wasn't legal for racing, iirc...
Ken
Bart wrote: | dyanut wrote: | Out of interest, how did you remove and re-fit the gear assembly on the camshaft?
Hydraulic press or axle stand and big hammer? ;o) | I used a hydraulic press.
Axle stand and big hammer, how is that supposed to work? Wouldn't one damage the wheel and shaft and how do you then get the wheel back on straight? |
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Bart Lowered
Joined: 17 Jun 2007 Posts: 783 Location: Södertälje
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Posted: Mon Jan 31, 2011 7:04 pm Post subject: |
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dyanut wrote: | Bart,
it was done by someone you will probably have met, as they owned a Barbour 4x4.
They were also one of the most successful competitors in the 2CV racing scene back in the 90s.
Best say no more, as altering camshaft timing wasn't legal for racing, iirc...
Ken | If your formulation is correct I have not met this person, cause all Barbour 4x4 owners I met and who raced 2cvs succesfull still own there 4x4...
Nevertheless, I didn't notice an advantage or disadvantage from retarded camtiming (valves open and close later). iirc I ofset it 7 degrees, cam or crack? I'm not sure, but 7 cam degrees seems a lot so I think it was 7 crankdegrees.
p.s. no 2cv racer told me how to change camtiming. I somehow heard it gets done, thought about it and what the advantage could be and just tried when I built my replacement engine. _________________ I like to play |
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dyanut Dropped
Joined: 05 Aug 2007 Posts: 177 Location: North Yorkshire
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Posted: Mon Jan 31, 2011 8:11 pm Post subject: |
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Bart,
my apologies, I wasn't sure if they still owned the 4x4, which is why I wrote 'owned'.
For the record, altering the cam timing relative to the crank didn't work for racing either, increased torque at low rpm perhaps, but poor top end.
A few hours of practice at Mondello and that engine was stripped down, then with a standard Citroen camshaft fitted the lap times improved dramatically.
As usual, Citroen got it right... ;o)
Still got the photographs of that work going on, but they must remain out of the public domain.
Ken
Bart wrote: | dyanut wrote: | Bart,
it was done by someone you will probably have met, as they owned a Barbour 4x4.
They were also one of the most successful competitors in the 2CV racing scene back in the 90s.
Best say no more, as altering camshaft timing wasn't legal for racing, iirc...
Ken | If your formulation is correct I have not met this person, cause all Barbour 4x4 owners I met and who raced 2cvs succesfull still own there 4x4...
Nevertheless, I didn't notice an advantage or disadvantage from retarded camtiming (valves open and close later). iirc I ofset it 7 degrees, cam or crack? I'm not sure, but 7 cam degrees seems a lot so I think it was 7 crankdegrees.
p.s. no 2cv racer told me how to change camtiming. I somehow heard it gets done, thought about it and what the advantage could be and just tried when I built my replacement engine. |
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Bart Lowered
Joined: 17 Jun 2007 Posts: 783 Location: Södertälje
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Posted: Sat Jan 25, 2014 3:28 pm Post subject: |
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In trouble again... but no issues
Found the cause for a mysterious oil leak which bothered me for quite a while.
Anybody seen this before? The aluminum is quite massive.. and I didn't even abuse it _________________ I like to play |
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TONY ENGLAND Lowered
Joined: 09 Aug 2007 Posts: 742 Location: MALDON, ENGLAND, UK
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Posted: Sat Jan 25, 2014 3:59 pm Post subject: |
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Hi Bart.
Shit that's not good at all.
Never seen that on a 2cv engine or heard of it either but I have on many other types of cars including BMW.
Hope you get it sorted _________________ If it works ok, "LEAVE IT THE FUCK ALONE". |
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