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Anders Dinsen
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« Reply #3 on: April 11, 2007, 02:13:21 pm » |
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Great to hear that you've found a trustworthy person to tune your car. Apparently it had the wrong dizzy cap and rotor arm, meaning that the contact to the top of the rotor arm had worn completely away. He replaced that and the plugs and then set the max dizzy advance to be 35degrees. He always sets that rather than the static timing.
Hmm... good idea, but must be difficult as it can't be done with the engine idling and the vacuum advance will have to be sucked to maximum advance. Do you know if you have the S-distributor or the original one? These charts are from Bernhard's site http://www.technikhomepage.de/kfz/elektrik/verteiler.html: Zero advance is 10 degrees, so that's only 30 degrees max on the S-distributor. The standard distributor is a few degrees less. Your 5 more will surely give you some boost, but you need to be more careful with fuel octane ratings... I have replaced my cap and rotor recently, though the carbon contact is still working. With the price of a set, there is little reason not to. - Anders
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« Last Edit: April 11, 2007, 02:20:27 pm by Anders Dinsen »
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1982 Talbot Matra Murena 2.2 prep 142 2017 BMW i3 "Charged Professional" 94Ah
Used to own: 2001 Renault Matra Grand Espace "The Race" V6 24v 1997 Renault Matra Espace 2.0 8V 1987 Renault Matra Espace J11 2.2
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Anders Dinsen
Administrator
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Posts: 3186
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« Reply #5 on: April 11, 2007, 02:57:28 pm » |
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It is very hard to find someone trustworthy, especially with these machines. This guy tunes old F1 cars, so should know a bit about engines.
I don't know how he set the advance and I always run it on 97RON petrol, at least.
Mine isn't an S, so I guess it is a standard dizzy. I spoke to Roy about this and his thoughts are that the differentl dizzy on the S was just down to stock reasons and not a performance mod.
Hmm, not unlikely but the distributor was part of the prep-142 upgrade (which mine received in it's early life) and besides during 1983, Matra produced both S-Murena's and standard 2.2's and I have never heard of an S-distributor on a standard Murena. But then again, since the difference isn't visible except from the stamped in part number, it is possible that it has gone unseen and there are some 2.2's driving around with the "wrong" distributor. - Anders
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1982 Talbot Matra Murena 2.2 prep 142 2017 BMW i3 "Charged Professional" 94Ah
Used to own: 2001 Renault Matra Grand Espace "The Race" V6 24v 1997 Renault Matra Espace 2.0 8V 1987 Renault Matra Espace J11 2.2
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