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Tacostik

Spark Plug Part #

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Tacostik

I searched but all the posts were about older boats. I don't have a manual for my boat. Anyone have the part number off the top of their head?

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UofK fanatic

Resource/DIY section post labeled Indmar Parts & fluid specs.

Edited by UofK fanatic

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Bobby Light

NGK - BPR6EFS gapped to .045. This is an upgrade to the AC delco plugs that come in them.

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Tacostik

Thanks!!

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Steve B.

Okay, that brings up a question I've had for years. Does the spark plug gap follow the plug or the engine?

In other words will the plug above have that gap no matter what engine it's in ?

Steve B.

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Bawshogg

Typically gap goes with the engine calibration. But OEM's typically don't use spark plugs other than the ones they spec for an engine. They set gap based on several factors, emissions compliance being one of them. When you start to switch brands or electrode type you run into different material resistances and such which will require differnt gaping accordingly. Typical rule of the thumb: The larger the gap the better, but some ignition systems will not throw a healthy enough spark to keep it from being blown out by combustion chamber pressures. More spark equals better flame propagation. Hopefully if you choose to run non OEM plugs someone has done the math for you and calculated optimimum gap for their plugs on a stock ignition system, but most commonly they just roll with the factory gap specs.

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Wakesetter67

Okay, that brings up a question I've had for years. Does the spark plug gap follow the plug or the engine?

In other words will the plug above have that gap no matter what engine it's in ?

Steve B.

I heard it was Both, depends on the application, And the plug, Different engines require diffident heat rage of Plugs and gap. Thats why I have to switch mine out this spring, heard it was two Cold, For My Engine 320 LCR Plug Gap .45 Just Like Bobby Or Mr Light states, Again that what was explained to me, Compression also plays apart, . I always thought .45 was for most applications in general.

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