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Old 09-04-2005, 01:16 AM
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Spark plug wires

How important is it that you get the same diameter spark plug wires to replace your old ones? I bought a set of 8mm wires for my boat but they seem slightly larger in diameter than the old wires (the old wires don't have the size marked on them). The parts guy at the store picked the wires out for me but I don't trust him -- new kid. I went ahead and put the new wires on, started the engine, and she seemed to run fine (though I haven't done an in-water test yet to run her at high rpms).

Think my engine will have any adverse effects?

(Confession: This if for my Mercruiser, so not a Mastercraft question though I suppose the same question/answer applies)

Thanks.
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Old 09-04-2005, 11:02 AM
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Bigger is better !
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Old 09-04-2005, 11:28 AM
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Shep, you should be just fine. Larger Diameter wires generally means either more insulation or better conductivity (or both) Make sure you have some good spark plugs in them engines and your ready to rock and roll!!
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Old 09-04-2005, 01:50 PM
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Thanks for the peace of mind jrandol! I put new spark plugs in at the same time. Running smooth... I'll go ahead and put the new wires on the other engine too (problem with twin engines -- you've got to do everything twice benefit -- we were 25 miles out on the Gulf when one of my starters went bad on me, used the other engine to cruise on home )
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Old 09-04-2005, 02:09 PM
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jr is right, bigger wires=less resistance=more power to plugs; also better insulation means less chance of crossfire (2 wires touching and sending spark to the wrong cylinder), so good deal on the new wires
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Old 10-12-2005, 04:53 PM
debecker13 debecker13 is offline
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Jrandol, do you have a part number for the spark plugs required in a 1995 PS 190 with the LT1 engine by any chance? I would rather purchase them from NAPA than pay a premium from a marine shop.
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Old 10-12-2005, 05:08 PM
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NAPA is were I buy all my boat parts that I don't get from BAWS. They seem to match parts better.

AC 41-931 is the stock plug

Below starting on page 57
http://www.indmar.com/files/manual/indmar_2001_om.pdf
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Old 10-12-2005, 05:09 PM
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My boat came with Taylor 8mm FWIW.
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Old 10-12-2005, 05:14 PM
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How long would it take to change out the wires? I seemed to have lost some top end, and I think I may need new plugs/wires. Cost?
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Old 10-12-2005, 05:15 PM
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Quote:
Originally Posted by erkoehler
How long would it take to change out the wires? I seemed to have lost some top end, and I think I may need new plugs/wires. Cost?
I changed mine in a matter of 20 minutes. Take you time and replace them one at a time.
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