I think you gona Win some hp, that you were loosing to preignition
particullarly if you use autogas, because the effect is the same of
predetonation, wich stole a lot of power and make excessive heating and
wearing. The retard brings the explosion to the best time, producing
power (pression) already when the piston is starting to go down. Then,
the engine rotation parts doesn't has to struggle or even fight against
(with) the gas expansion, wich breaks the works

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