Spark plug question

howie123

howie123

Senior Member
I have been using Motocraft TT10 spark plugs. I decided to order a set of Champion W18 as recommended in an earlier post. I ordered them through a local parts store. When I picked them up the box looked quite long. The box is labled 518 W18. The plugs are quite a bit longer than the TT10's. From the ground electrode to the shoulder that contacts the head is about 1/8 in. longer. From the shoulder to the top is about a 1/4 longer. The reciept lists them as ag/ind. plugs. Are these correct? Will the extra length interfere with the pistons. I haven't installed them so they could be returned. Thanks Howie
 
The W-16 / W-18 should be fine.... take a look at original-equipment Champion 3 X plugs sometime... they have a LONG reach...

They are listed as an "Agricultural / Industrial" plug because no car or truck has used them since about 1935...

The old Model L Gravely two-wheel walk-behind tractors continued to use the TT-10 / W-18 plugs until Gravely stopped making their own engines, in the early 1970's.


I just put a set of Autolite 3076 plugs in my '28, as that's what was available locally.



I would love to try some 3 X plugs, but just can't bring myself to install my new ones in a driver car....

(PS: the plugs sit over the valves, not the pistons... )
 
In my humble opinion, the W16Y Champion (should be about same length) works and
looks really good. I, too, have used the more economical Autolite 3076 and they
worked fine for about 3.00 bucks a pop------but they look kind of puny once installed. One of our astute Barners----if he is listening----can tell you more about
spark plugs than you will ever want to know, lol.

Jack
 
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