Motoguzznix Itävalta:
"The Breva 1100 iginition map is no good idea for the V11. It has a lot more pre ignition than even the V11 stock map. It will cause pinging and bad running behavior. It only works with a moderate compression ratio and low volumetric efficiency of the engine. The same goes for the standard ignition coils of the Breva. When using the Breva/Fiat coils, don't go havoc with compression ratio. I was pretty unsuccessful when tuning a Breva 1100. We raised the compression to slightly above 11:1 and the engine pinged/knocked severely. To get it out from pinging, I had to reduce the ignition timing so much that all the gains from the compression raising were gone. All this because the coils were not able to burn the mixture correctly. When the compression pressure gets too high (good VE, high CR), the spark is too weak with these coils. They are designed to fire 2 spark plugs of a 4-cylinder car engine. On such an engine, one cylinder is during overlap when the other is ready to fire! The spark during overlap doesn't need much energy so the other cylinder gets 90% of the energy available from the coils. In a twin plug Guzzi engine, both plugs in one cylinder are in need of the full energy which the coil cannot deliver simply because it is not designed for that purpose. When keeping the compression at 10:1 and the mixture not too weak it will work. But you cannot get the full benefits of twin sparks with these coils. But if there are any advantages compared to single spark? I doubt. And this compression works also with single spark. Mine is at 10,5 with single spark."
Tuossa puhuu omasta V11 Guzzistaan ja 1100 Brevan nakuttamisesta, V11 oli tietojeni mukaan ennen katteja 9,5:1 ja kattipelit 9,8:1 (laihemman seoksen syttyminen) puristuksilla tehtaan jäljiltä, mutta ei kahta tulppaa.
Mike Rich USA:
"The Breva/Griso coils are the way to go. Switch to non protected spark plugs, with a heat rating of 8 instead of the stock 6."
=> Olisiko tuo sopivien tuplatulppapuolien (heikko kipinä korkeilla puristuksilla) puute syy siihen, miksi tuplatulppaisten V11 karttojen kerrotaan olevan sytytykseltään silti hyvin aikaisella kuten tehtaan alkuperäisetkin kartat?
