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Old 08-29-2009, 04:58 PM
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Marine VS Standard Spark Plugs

Can someone tell me the difference between a Marine plug and a standard automotive plug?

My crate BBC called for the ACDelco MR-43T spark plugs but I've done some mods that will increase cylinder pressure so I want to go to a slightly cooler plug which would be a MR-44T.

The local parts stores don't carry the MR series (Marine) plugs but they do have the standard R series plugs. I'm going to take an MR plug down and compare the dimensions but at a glance they look identical.

I've noticed that other brand's standard plugs cross reference to the Marine plugs but there has to be some difference.

I sent ACDelco an email asking the same question but have yet to receive a reply.

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Old 08-29-2009, 05:46 PM
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Your going the wrong way, from a 43 to a 44 plug would be going hotter in AC plugs.
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Old 08-29-2009, 05:54 PM
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Thanks.

I was thinking about how Autolites are numbered.
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Old 08-29-2009, 05:56 PM
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This is from the Champion web site:
Champion offers spark plugs for all marine applications, such as inboards — including diesel engines that require glow plugs — outboards, jet boats or personal watercraft (PWC). Champion’s marine plugs also have stainless steel threads that never rust, are easy to remove and are particularly well-suited for saltwater environments.

Champion marine spark plugs have an extruded copper core in the center electrode that maintains accurate control of heat range, optimizing the performance and longevity of the spark plug. They start easily and won’t leave marine equipment operators stranded.

The electrodes on Champion marine spark plugs use our Heat-Active™ alloy to reach operating temperatures quickly and maintain stable operating temperatures under varying engine loads.

Champion marine spark plugs also have a patented Mag Suppressor that provides maximum protection from radio frequency interference (RFI) in GPS/fish finders.

AC Delco, not so easy to find specifics.
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Old 08-29-2009, 06:03 PM
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Quote:
I'm going to take an MR plug down and compare the dimensions but at a glance they look identical.
Ayuh,.... dimensionally, they Are the same...
The Only difference is, the Marine plugs are of an Alloy Body..... Less Rust....
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Old 08-29-2009, 10:05 PM
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try a Autolite 144 or a champion RV8C.
if you need cooler than that you are into a non resistor racing spark plug.
Champion V63C V59C etc. These run cool for (WOT high compression, supercharged racing) may foul with extended idleing or low rpm operation.
Non resistor type plugs do not supress radio ignition induction noise.
Not recomended if you are running most any of the Marine type CDI ignitions.
Mercruiser EFI Thunderbolt etc.

Last edited by F-BIRD'88; 08-29-2009 at 10:18 PM.
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Old 08-31-2009, 09:29 PM
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Here's the official response from ACDelco. Basically repeating what was already said here.
_______________________________________
The only difference is marine and non-marine. ACDelco marine plugs feature
a nickel-plated, rust resistant shell on all applications, and a clipped
side electrode on some applications. These plugs are designed for higher
RPM engines. They also have a larger heat sink, and the porcelain is not
only pressed into the heat sink, it is glued.

Spark plugs must operate within certain limits if they are to provide the
performance and service life expected. Engine manufacturers select a type
of spark plug for the normal or expected service for which the engine was
designed.

The heat range, which is designated by the second numeric digit (second 4)
is the same in both spark plugs.
________________________________________
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Old 09-04-2009, 07:33 PM
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Quote:
Originally Posted by 70bird
Here's the official response from ACDelco. Basically repeating what was already said here.
_______________________________________
The heat range, which is designated by the second numeric digit (second 4)
is the same in both spark plugs.
________________________________________
The first numeral being a 4 is the same in both but the SECOND numeral, one being a 4 and one being a 3, are NOT the same.
Ericnova is correct, the 43 is colder than the 44.
Terry
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Old 09-05-2009, 10:41 AM
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He comment on being the same heat range was when comparing the MR44T to the R44T.

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