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04-22-2022, 10:31 AM | #41 |
Senior Member
Join Date: Apr 2018
Location: Mebane NC
Posts: 2,354
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Re: Autom. advance spark timing
Yeah, setting the Nu-Rex's baseline to somewhere ATDC is a decent workaround and won't hurt the car (unless you idle for a really long time). It's just odd to me that a stock engine wouldn't take 28° advance, particularly if you're using high-octane petrol. Something else must be going on, although we may never know what.
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04-22-2022, 12:21 PM | #42 | ||
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Join Date: May 2018
Posts: 44
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Re: Autom. advance spark timing
Quote:
Quote:
ETA: I love your YT vids too! |
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04-22-2022, 01:13 PM | #43 |
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Join Date: Mar 2022
Location: Chenango Bridge NY
Posts: 433
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Re: Autom. advance spark timing
FSI recommends idle timing at 0 degrees as well. Combustion chamber turbulence has an effect on timing as well, the Flathead chamber has been studied for decades, Briggs and Stratton has a great design, Jim Brierleys Silberstein design incorporates a stepped chamber that effective too. I run an original Winfield 7 to 1 and an NOS late B high lift cam and still need to control timing to avoid detonation.
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04-22-2022, 02:18 PM | #44 |
Senior Member
Join Date: Apr 2018
Location: Mebane NC
Posts: 2,354
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Re: Autom. advance spark timing
Thanks, I really am going to complete the Nu-Rex series as soon as I can. Just have a lot going on now. I really want to get the B distributor into a video, I think a lot of people don't quite understand how it differs from the A.
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04-29-2022, 10:45 PM | #45 |
Junior Member
Join Date: Mar 2021
Location: Bell County Texas
Posts: 24
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Re: Autom. advance spark timing
My grandfather installed a B distributor on my (inherited in 1990) ‘31 coupe in 1951. In ‘73 when we started the restoration my dad told me it ran great with the B distributor so we left it on. We always set timing to 5 deg. advance at 500 rpm with timing light. Since then, after about 3,000 miles it still runs good but now I’m wondering how much better it might run with an A distributor. Just picked up an A distributor, cable and spark rod at Pate so can’t wait to try it out.
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04-30-2022, 06:41 AM | #46 |
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Join Date: Mar 2022
Location: Chenango Bridge NY
Posts: 433
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Re: Autom. advance spark timing
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The A distributor is foolproof, other than the timing is fixed where it’s set, you don’t get automatic spark control based on rpm.. |
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