318 ignition system

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Busia
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Re: 318 ignition system

Postby Busia » Sun Aug 18, 2019 11:16 pm

Ignore your timing mark on the dampner, it may have slipped. If it runs good it sure isn't at 36degrees BTDC.
BUSIA
located in Ketchikan, Alaska. Gods country
32 foot Marinette express. (no fly bridge)
twin 350 Crusader (Chev 350) engines
1:1 Borg Warner velvet drive transmissions
Closed cooling (antifreeze in the engine)
Proud to be retired IBEW

JohnO
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Re: 318 ignition system

Postby JohnO » Mon Aug 19, 2019 4:52 am

Using flywheel marks showing basically same thing. (Only about 2 degrees difference).
John

1984 28' Sedan Flybridge
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TinLizzy
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Location: Lake Superior-Michigan's U.P.

Re: 318 ignition system

Postby TinLizzy » Sun Aug 25, 2019 10:57 pm

First thing I would do is a compression test, popping through the carb under load could be ( among other things) a blown head gasket or it could have a valve or two not seating.
Rodney
1975 28 Express-Twin 350 Chevy's, Raw Water cooled
Portage Canal Waterway-Upper Peninsula,Lake Superior

Fastjeff
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Re: 318 ignition system

Postby Fastjeff » Mon Aug 26, 2019 6:31 am

Or a mixed up in the spark plug wires. Easy to mess them up the way the wires dive under the manifolds.

Jeff
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington

JohnO
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Re: 318 ignition system

Postby JohnO » Mon Aug 26, 2019 3:54 pm

Thanks guys. I agree Jeff! I actually replaced the plugs last weekend and was very careful. I'm going to try to take it out and see. Timed it by RPM's in the dock got it up to 1800 in gear runs like a champ. Didn't want to take it higher. Lake Michigan has been brutal on the west side. Looking for a calm test day. Still a mystery why the marks are off so much, but we'll see what happens. Of course the timing light went out on me too.
John

1984 28' Sedan Flybridge
Father original Captain

barkleydave
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Re: 318 ignition system

Postby barkleydave » Mon Sep 02, 2019 10:47 am

By the way I am running OEM plug wires no issues.
1987 Marinette 29 FB Sedan
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JohnO
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Re: 318 ignition system

Postby JohnO » Tue Sep 03, 2019 6:59 pm

I don't want to jinx myself but I think I found the problem. Petronix distributor shipped with silver springs which was also acknowledged earlier in the forum. I wasn't getting any advance until 2200 rpm. I finally got some decent weather and was able to run again. Both engines crapped out this time. Limped back in under 1000. Switched out the springs to gold and set the timing back to 5 degrees. Both engines running like a champ! Gradual advance while accelerating from idle. Thanks to everyone that helped me talk through it!
John

1984 28' Sedan Flybridge
Father original Captain