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1982 Nautique 351 Ford, Presolite point ign. Timin |
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morris2125 
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Joined: August-12-2021 Location: Iowa Status: Offline Points: 29 |
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 Topic: 1982 Nautique 351 Ford, Presolite point ign. TiminPosted: August-17-2021 at 8:48pm |
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Hello,
Have a 1982 Ski Nautique with 351 Ford PCM, Prestolite point ignition. Looking for ignition degree timing at idle and around 2000rpm, it should be advancing by 2k. Also what is recommended idle setting. Thank you for any help.
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KENO
Grand Poobah 
Joined: June-06-2004 Location: United States Status: Offline Points: 11112 |
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Posted: August-18-2021 at 6:35am |
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Since that's a clip down cap earlier Prestolite as compared to the screw down cap version used from 87 on, PCM's number for initial timing was 6 degrees BTDC.
The later one was 10 degrees because the advance limiter plate was different.(it's the slotted thing with the point cam attached in the picture below) I'd look under the points plate and verify that the weights move freely and aren't all rusted up and also verify that both advance springs are intact. The 2 springs are different from each other. One is heavy with oval shaped ends and has no tension on it when just sitting there. It only works to limit advance at high RPM like above about 3500. The small one with lighter wire should have tension on it while just sitting there and is working through the whole RPM range. Since it works a lot harder than the big one, it can break or stretch too much and wreak havoc on you ability to get the timing right. Here's a picture showing both springs installed at rest Heavy spring is top left and lighter spring bottom right If you have spring issues, you'll have curve issues   here's a "typical" curve for the clip down cap distributor with good springs and weights.( and no wear or slop, but after 39 years there's gonna be some) RPM Timing 500 O + initial timing 1000 4 + initial timing 1500 12 + initial timing 2000 16 + initial timing 2500 18 + initial timing 3000 22 + initial timing 3500 24 + initial timing 4000 24 + initial timing So you could set it at 6 degrees and come up with about 30 degrees at full throttle or set it at 10 degrees and get about 34 degrees Here's a link to a PCM manual from the 80's (from the CCF reference section) that should be helpful to you. Page 8 has idle speed and timing info. |
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morris2125
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Joined: August-12-2021 Location: Iowa Status: Offline Points: 29 |
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Posted: August-18-2021 at 3:01pm |
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Thank you for the great help.
morris2125
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