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VW Engines
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<blockquote data-quote="eglijim" data-source="post: 94314" data-attributes="member: 441"><p>Seem to have a reply from Greg which has not appeared on the thread suggesting that the impulse does not retard the timing, merely spins up the mag for an initial pulse. Can assure you that the Scintilla mag with an impulse coupling does retard the first spark . The impulse spring operated by gravity via a catch to "wind up" and de-activated by a bob weight system as the engine spins up. At hand cranking speed the spark is retarded til after tdc as the wound up spring is not released to spin up the mag til this point. We (legally) ran the motorglider with a heavily modified 1500cc magnesium VW engine with only one mag . If things went south , find a suitable field !.</p></blockquote><p></p>
[QUOTE="eglijim, post: 94314, member: 441"] Seem to have a reply from Greg which has not appeared on the thread suggesting that the impulse does not retard the timing, merely spins up the mag for an initial pulse. Can assure you that the Scintilla mag with an impulse coupling does retard the first spark . The impulse spring operated by gravity via a catch to "wind up" and de-activated by a bob weight system as the engine spins up. At hand cranking speed the spark is retarded til after tdc as the wound up spring is not released to spin up the mag til this point. We (legally) ran the motorglider with a heavily modified 1500cc magnesium VW engine with only one mag . If things went south , find a suitable field !. [/QUOTE]
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