Timing setting 1 btdc or 6 btdc . OMC 4.3L

[aldwill49]

The manual has two different settings for timing. 1degree btdc and 6 degrees btdc. I see no explaination as to which should be used. Last tune up I had done, the mechanic changed it from 6degrees to 1 degree. It seems to still run ok. But would like to find out why the difference. I would think the 6 would be better for top end running and 1 for slower speeds. <br /><br />Thanks

 

[Don S]

Re: Timing setting 1 btdc or 6 btdc . OMC 4.3L

It's gonna take more information than that, Like year?

 

[P.V.]

Re: Timing setting 1 btdc or 6 btdc . OMC 4.3L

The difference is depending on the octane /fuel you run. 6 degrees for 92 or 1 degree for 87 octane. Which can you afford and get on a daily basis?

 

[aldwill49]

Re: Timing setting 1 btdc or 6 btdc . OMC 4.3L

1986 EbbTide bowrider, OMC 4.3L V6 2barrel, Cobra.<br /> Ok, 1degree works for me. Since I usually use 87 octane. Occasionally I will use a higher octane thinking the extra additives would help clean out the carb. Maybe that's not such a good idea.<br />Thanks.