Autolite 2245- Not the Same

[renovate7]

My new spark plugs arrived. They are different from what was in the A2. What was in there was an Autolite AER72S. The new ones are longer and the threaded part that screws into the cylinder head is shorter. Does it matter? Thanks...Tried to up load pic but am getting a message that says the board attachment quota has been reached. Is that for a day, month?

[Rickf]

The 2245's are the right plug. Not sure what the others are for.

[raymond]

Not sure about the numbers you listed, but Autolite used to make an AR7, sometimes followed by an S or a C. The 2245 superseded it though.

Raymond

[renovate7]

Thanks. The AER72S is a waterproof/looks almost identical plug. Just the differences I noted.

[Kurt Lesser]

See below.

Kurt

[renovate7]

I'm finally able to post this pic. Every vendor I see sells the 2245 for the MUTT. The plugs that came out are old and the old numbering system.

IMG_0003 (640x480).jpg (250.57 KiB) Viewed 438 times

[Kurt Lesser]

The 2245 is a 14mm plug with a 3/8" reach and a heat range rating of 5. The AER72 is not good substitute, it is the equivalent of an Autolite 2407 which is a higher heat range plug plug with a 1/2" reach. The higher heat range might be good to prevent fowling but it can also lead to run-on when you shut the engine down.

Suitable substitutes are:

Delco WR46
Crown SR6F
Champion 517, ORD02, XMJ17
Motorcraft AR7S

The other problem I see is the longer length outside might not allow the cable to make good contact resulting in lost power or misfiring.

These plug are avallable from multiple sources for around $12 or less, why take unnecessary chances? There listed here for $5.50 ea:

http://www.autopartstomorrow.com/part_n ... spark-plug

Kurt

[Rickf]

Those old plugs are a hotter plug also, Extended tip means longer path from electrode to shell.

[renovate7]

I have installed the 2245's, which is the new plug in the picture. The old plugs are the 72s. I was going to keep them as spares but now think I will pitch them. Out with the old, in with the new.

[Ben Dover]

Warning, The Ols Champion Number AER-72S was the spark plug for the M-715 OH Cam Tornado Engine, only. It is 1/2 " Reach, the 2245 is 3/8" Reach and is the latest Autolite version for the M-151.

You mentioned the new (2245) Sparkplugs being longer. That is correct, as you are talking about the barrel of the spark plug. The M-715 requires a Water Proof Spark Plug with a shorter barrel as the 6 spark plugs are angled in pairs toward each other and require that shorter barrel in order to have room to install the wires. Installation of Long barrel water Proof Spark Plugs on the M-715 will result in the ends of the barrels almost touching and making it impossible to install the wires.
That is my M-715 story of the day. :wink:

[Rickf]

I knew I recognized that number from somewhere. The 230, if it ain't leaking it ain't running.