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Home » HD Forums » Forums » Boat Tech » Spark Plug Gap?
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MrCordMale Offline
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Post Icon Posted: June 27 2006,7:02 pm Post # 1 see this member send this member a private message  quote this post in reply
OK....  496 11:1 comp, lots o fuel, 950 demon, huge heads, highrise intake, msd 6al ingnition, blaster coil...  


Just bought some new Accell plugs and I am curious as to the suggested plug gap?  


The old ones were .043 I think.... Any suggestions???

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AZKCMale Offline
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Post Icon Posted: June 27 2006,7:09 pm Post # 2 see this member send this member a private message  quote this post in reply
+/- .045 is what I set mine but fine tune tweaking is not my specialty. How do the old plugs look?

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Sleek-JetMale Offline
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Post Icon Posted: June 27 2006,7:25 pm Post # 3 see this member send this member a private message  quote this post in reply
MSD says between .040 and .050 for you compression ratio...  :good

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MrCordMale Offline
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Post Icon Posted: June 27 2006,7:39 pm Post # 4 see this member send this member a private message  quote this post in reply
The old plugs were carbon fouled as hell... I leaned it out... Doubled my gas mileage...  But im replacing the old plugs anyways...  

The boat has been acting funny... Sometimes when you floor it.  5100 rpm... but after a long hard run... Floor it and 5600 and 70 mph when before it was 61 or so...  This is GPS by the way...

But after a long hard run the heat seems a little cold from puling one after a full throttle run...  So I Went a step hotter...  But the gap has me scratching my head...



THANKS FOR THE TIPS... I shouldnt have been so lazy and looked it up on my own... But thats what HDF is for right?? :good

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GoFastRacerMale Offline
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Post Icon Posted: June 28 2006,5:42 am Post # 5 see this member send this member a private message  quote this post in reply
Well that was easy!. :laugh
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MrCordMale Offline
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Post Icon Posted: June 30 2006,8:33 am Post # 6 see this member send this member a private message  quote this post in reply
One more question...

I gapped all the plugs to about .048   not if the range is .040 to .050  is bigger gap better?

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GoFastRacerMale Offline
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Post Icon Posted: June 30 2006,10:38 am Post # 7 see this member send this member a private message  quote this post in reply
Bigger gap longer spark, but the wider the gap the harder it is on the ignition unit and the effiency goes away, that's why you go by the MFG's suggested gap!..
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MrCordMale Offline
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Post Icon Posted: June 30 2006,10:42 am Post # 8 see this member send this member a private message  quote this post in reply
Cool deal.... Maybe I will just stick with good enuf and go back to the original .043

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GoFastRacerMale Offline
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Post Icon Posted: June 30 2006,8:38 pm Post # 9 see this member send this member a private message  quote this post in reply
Why??, as I said wider gap more spark, if the MFG suggest up to .050 then .048 is cool leave it, if you go over that then you start to pull the ignition down!..
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