Rev Limiting distributor rotor

[jury]

For example :

In a stock 2.2 engine......If there was a NON rev limiting rotor in a Magneti Marelli Distributor....Where would the rev limiting take place ?


Cheers
Chris

[hot66]

… I assume until either it can’t breathe any more air volume in or the valves float and

[Gary71]

…or it throws a rod…

[hot66]

Look forward to Chris trying it now to see what goes first

[Jonny Hart]

For example :

In a stock 2.2 engine......If there was a NON rev limiting rotor in a Magneti Marelli Distributor....Where would the rev limiting take place ?


Cheers
Chris

Doubt there ever was a stock car sold without the rotor limiter.

In the twin plug race cars, the 8 pin CDI boxes had an adjustable limiter. That’s the only ‘non rotor’ limiter I’ve ever seen on early cars. (Apart from my boxes which have a built in electronic limiter).

[Lightweight_911]

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I'm fairly sure that the Marelli distributors used in the 2.0/2.2 911T models didn't have rev-limiting rotor arms ...

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[Jonny Hart]

^ Interesting. So that’s just the T models?

[Nine One One]

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I'm fairly sure that the Marelli distributors used in the 2.0/2.2 911T models didn't have rev-limiting rotor arms ...

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The originals did, but reproductions do not, the repo’s also do not have the resistor in them either, and need a 5k resistor fitted in line from the cap to the coil to protect the CDI unit. I think PartsKlassik are the only retailers to mention this for the repo units?

https://www.partsklassik.com/p-992-igni ... relli.aspx

[Jonny Hart]

^. The 5k resistor is mainly about noise suppression. There’s also 3k in each plug top and about 1k in a typical HT lead. Resistance in the HT path also slows the current delivery which may be slightly kinder to the CDI unit.


Anyhow, if you need a limiter and don’t have a limiting rotor, there’s a programmable limiter in our CDI+ units. Much kinder to the engine too.

[jury]

Thanks for the replies....Hmmmm, next steps to try and figure out the weird flat spot.

I have had the distributor tested and all is good, replaced advanced springs . Also the petronix currently fitted, is all good. Negative connection on Battery terminal was loose...new clamp fitted !

The MSD box has been sent back to them to bench test and a new coil has been ordered.


Will report back

Cheers
Chris