slowlearner Posted July 7, 2021 Report Share Posted July 7, 2021 I'm looking to populate a spark advance table like the one below with useful figures to get a car running. The motor is a stockish L18 with twin SUs and headers. I need something conservative that will help it run but not cause issues. Ignore the figures in the table, they're from a different project. Quote Link to comment
datzenmike Posted July 7, 2021 Report Share Posted July 7, 2021 I think around 34 total advance is usual for L series 4 cylinder engines. Stock initial advance is 10-12 degrees Do you have some sort of programmable spark advance then? doesn't it sort of 'learn' as you drive it? Quote Link to comment
slowlearner Posted July 7, 2021 Author Report Share Posted July 7, 2021 7 minutes ago, datzenmike said: I think around 34 total advance is usual for L series 4 cylinder engines. Stock initial advance is 10-12 degrees Do you have some sort of programmable spark advance then? doesn't it sort of 'learn' as you drive it? I can do "learn as you drive" for the fuel table, but not for spark. I need to get advance vaguely right, then the fuel table close to spot on. Then I can add more timing from there. Quote Link to comment
datzenmike Posted July 7, 2021 Report Share Posted July 7, 2021 Well start with whatever the stock distributor had. What year L18 and in what? I have some distributor specs. I imagine they are all close to the same. Quote Link to comment
datzenmike Posted July 7, 2021 Report Share Posted July 7, 2021 Initial timing here is very retarded for emissions. The L18SSS dual SUs in Japan were 14 degrees initial @ 550, 8 degrees mechanical @ 1,800, vacuum advance starts at 6.25 in hg. and tops out at 8 degrees @13 in. hg. Quote Link to comment
slowlearner Posted July 9, 2021 Author Report Share Posted July 9, 2021 On 7/7/2021 at 10:57 PM, datzenmike said: Well start with whatever the stock distributor had. What year L18 and in what? I have some distributor specs. I imagine they are all close to the same. I have no idea what year the L18 is but I assume it came from a 610 in the 70s. Here's the number... But I can't guarantee the dizzy is stock either... Quote Link to comment
datzenmike Posted July 9, 2021 Report Share Posted July 9, 2021 '73 was the first and only year for the L18 in a 610, '74 for the 710 and 620. Not a lot of L18s around. My '73 FSM shows the vacuum and centrifugal advance for an L18 in the '74 620. Want it? Quote Link to comment
banzai510(hainz) Posted July 9, 2021 Report Share Posted July 9, 2021 didnt auusie Datsun have Bosch distributor made in Australia? Quote Link to comment
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