318 ignition system
Re: 318 ignition system
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 (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 and an A+P
located in Ketchikan, Alaska. Gods country
32 foot Marinette (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 and an A+P
Re: 318 ignition system
Using flywheel marks showing basically same thing. (Only about 2 degrees difference).
John
1984 28' Sedan Flybridge
Father original Captain
1984 28' Sedan Flybridge
Father original Captain
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- Royal Aluminum Star
- Posts: 266
- Joined: Mon Jan 19, 2015 11:07 pm
- Location: Lake Superior-Michigan's U.P.
Re: 318 ignition system
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, SOLD
1990 32 Express--Twin Mercruiser 454 with Bravo I outdrives
Portage Canal Waterway-Upper Peninsula,Lake Superior
1975 28 Express-Twin 350 Chevy's, SOLD
1990 32 Express--Twin Mercruiser 454 with Bravo I outdrives
Portage Canal Waterway-Upper Peninsula,Lake Superior
Re: 318 ignition system
Or a mixed up in the spark plug wires. Easy to mess them up the way the wires dive under the manifolds.
Jeff
Jeff
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington
Re: 318 ignition system
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
1984 28' Sedan Flybridge
Father original Captain
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- Site Admin
- Posts: 410
- Joined: Sat Jul 12, 2014 6:18 am
- Location: Kentucky
Re: 318 ignition system
By the way I am running OEM plug wires no issues.
1987 Marinette 29 FB Sedan
Retired Boat Accident UL and USCG trained investigator
Retired USCG Captain
Retired Boat Accident UL and USCG trained investigator
Retired USCG Captain
Re: 318 ignition system
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
1984 28' Sedan Flybridge
Father original Captain