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Technical
Initial engine break-in setup — running rough
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<blockquote data-quote="NigelDenham" data-source="post: 637386" data-attributes="member: 32435"><p>I’ve a couple of svda’s, old Bosch and recent pertronix. Both behave about the same, I time (with vacuum hose removed and capped) to 30 degrees btdc at max mechanical advance- all in by about 3,500 rpm by the readout on the timing gun, then they both drop to 7 or 8 degrees btdc at idle. Connect the vac hose back on and the advance goes up a degree or so at idle.</p><p>So it looks like you get around 22 or 23 degrees mechanical advance (which I guess is all an 009 would give you), and the vacuum advance adds another 10 or 12 when needed?</p><p>My engine seems really picky about carb (34 pict-3) and timing settings, yet a friend has a 1600 tp in his split screen with the same (but really cheap chinese) carb and 009 distributor and his runs beautifully no matter what you do to it! These things are so old and have so many non-standard bits by now I doubt any two run the same…..</p></blockquote><p></p>
[QUOTE="NigelDenham, post: 637386, member: 32435"] I’ve a couple of svda’s, old Bosch and recent pertronix. Both behave about the same, I time (with vacuum hose removed and capped) to 30 degrees btdc at max mechanical advance- all in by about 3,500 rpm by the readout on the timing gun, then they both drop to 7 or 8 degrees btdc at idle. Connect the vac hose back on and the advance goes up a degree or so at idle. So it looks like you get around 22 or 23 degrees mechanical advance (which I guess is all an 009 would give you), and the vacuum advance adds another 10 or 12 when needed? My engine seems really picky about carb (34 pict-3) and timing settings, yet a friend has a 1600 tp in his split screen with the same (but really cheap chinese) carb and 009 distributor and his runs beautifully no matter what you do to it! These things are so old and have so many non-standard bits by now I doubt any two run the same….. [/QUOTE]
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EarlyBay Forums
Technical
Initial engine break-in setup — running rough
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