Best spark plugs.
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=5616
Printed Date: November-27-2024 at 4:41pm
Topic: Best spark plugs.
Posted By: Morto
Subject: Best spark plugs.
Date Posted: January-26-2007 at 8:27pm
Hi everyone, sorry if this question has been covered (I did do a pretty thorough search). What would be the best spark plugs for our '82 Ski Tique PCM351W. Engine is newly rebuilt (about 12 hours on it) and is all standard (according to our receipts the donk was replaced new in '92 from PCM). It has a Holley 600 Vac Sec and the Prestolite with the breakerless module, Crane coil and no ballast. When I brought the plugs on a quick trip to OZ prior to firing it up they had no plugs specifically for the old Windsor so he gave me a set for a 5.0 EFI (NGK). He said if it starts to miss at high RPM just close the gap up a bit, which it is doing but I haven't taken the plugs out yet. You have to run nearly flat out for half a minute before it misses, and you only have to ease up a bit to stop it. Apart from the missing the engine is a delight. I've got another quick trip to Australia Wednesday so thought I'd ask you guys prior to going. What do you think?
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'82 Ski Tique PCM351W
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Replies:
Posted By: 87BFN owner
Date Posted: January-26-2007 at 8:31pm
autolite double platiniums, what we used to run in my brothers 351.
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Posted By: GottaSki
Date Posted: January-26-2007 at 9:56pm
Whats a donk? and no Mik Dundee jokes either.
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole
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Posted By: nuttyskier2002
Date Posted: January-26-2007 at 10:17pm
Autolite 24 is the standard plug. The double platinum is APP24. Some guys prefer to run the 25's though because they are a bit hotter. Some cross reference manuals even say to use the 25's but I think most guys prefer the 24's.
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95 Malibu Echelon w/Mercruiser 350 Magnum Skier
Former boats:
88 Ski Centurion Tru Trac II
59 Chris Craft Capri (woody)
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Posted By: 81nautique
Date Posted: January-27-2007 at 9:21am
Be careful with that missing at top end, you could be running lean and burn a piston. My set up is basically the same as yours and I run Autolite 24, after 50 hours this summer they look like new and it never misses a beat at 4800 WOT.
There were a few threads recently about running too hot a plug and lean conditions that ended up in holes in pistons so I would check that out asap. Good luck mate.
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You can’t change the wind but you can adjust your sails
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Posted By: Morto
Date Posted: January-27-2007 at 7:48pm
Thanks guys, very helpful. A "donk" is a motor, sorry about that - only saved one syllable too.........................
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'82 Ski Tique PCM351W
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