Champion 3xs or other plugs?

[Purdy Swoft]

The W sixteen Y Spark plug is hotter at fifty five hundred RPM .

Fifty five hundred RPM doesn't apply to a stock or near stock model A engine

The model A engine produces maximum horse power at twenty two hundred RPM

Unless the engine is highly modified it will never reach fifty five hundred RPM .

I believe that the article stated that the Champion W sixteen Y spark plug was closer to W fourteen .

The Champion W fourteen is WAY TOO cold for the model A engine and would run black all of the time .

The article also states that the original Champion Three X is about the same heat range as the Champion W eighteen .

The projected tip on the Champion W sixteen Y caused me to buy two boxes of ten , W sixteen Y spark plugs

After nearly sixty years of working on my cars I do know that a projected tip means hotter heat range .

I did not know that the heat range of the W sixteen Y spark plug was determined at fifty five hundred RPM .

Just to make this easier to understand , the W sixteen Y spark plug is much colder at twenty two hundred RPM and is too cold for the model A !!!!!!!

A local parts house happened to have two boxes of ten , W sixteen spark plugs

Thinking that the W sixteen would be hotter I bought both boxes .

It didn't take very long to run through the two boxes of too cold spark plugs .

This SHOULD tell a person that the Champion W sixteen Y is just too cold and will run black . This has also been my experience .

[Benson]

I used W16Y for 20 years ... short story is:

In the 60's we lived 25 miles one way from town and I drove it 7 days a week at 55 MPH and around town then back home. Engine speed never got to much more than 2800.

45000 miles during this time ...

At highway speeds W16Y plugs worked great!


Then we moved to town with many short trips (5 to 10 miles or so), with stops in between and little highway.

W16Y Plugs started to foul out.

Installed W18s which work well.

[Purdy Swoft]

I also used the W sixteen Y spark plugs for many years .

They ran black most of the time .

At the time I didn't know that the advertised heat range of the W sixteen Y spark plug was determined at fifty five hundred RPM .

If I had driven the model A faster it may have run cleaner
eaner .

[Y-Blockhead]

Originally Posted by Purdy Swoft

This SHOULD tell a person that the Champion W sixteen Y is just too cold and will run black . This has also been my experience .

I don't think anyone is arguing that point.

[1931 flamingo]

I ran the W18's for years with NO problems. FWIW
Paul in CT

[Shelbycsx]

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The 3x plugs with the flat top 3 are reproduction. Is there a reproduction 3x plug with the round 3? What year did they stop making the original 3x?

[F.M.]

Originally Posted by Shelbycsx

The 3x plugs with the flat top 3 are reproduction. Is there a reproduction 3x plug with the round 3? What year did they stop making the original 3x?

# 1 NO # 2 I think sometime in 1932. You find some round ones in some of the new bases.

[GerryAllen]

Folks, went to my local NAPA dealer and he suggested I try Auto Lite 3076. I looked at a cross reference chart and the 3076 spark plugs were comparable to the W18.
Any comments ............... please I am new to Model A's make this a teachable moment ie benefits of one verses the other
Gerry Birch Bay WA

[Patrick L.]

Originally Posted by GerryAllen

Folks, went to my local NAPA dealer and he suggested I try Auto Lite 3076. I looked at a cross reference chart and the 3076 spark plugs were comparable to the W18.
Any comments ............... please I am new to Model A's make this a teachable moment ie benefits of one verses the other
Gerry Birch Bay WA

Did you look at #8.

[GerryAllen]

Pat, please explain #8, is that an Auto Lite plug that would be more comparable to the W18 than the others?????

[30 Closed Cab PU]

Did not feel like rereading this 30 post string, so excuse me if this has previously been covered. The following was my expereience. I was running the 3076. For some reason that I have yet to figure out my truck seems to run rich and the 3076 would run black on the center insulator, especially around town. Switched to the Champion W18, now the center is tan with a little black flecks. The W18 seems to be a little hotter than the 3076. So what you need depends on your plug reads.


Plug reads, only use the center insulator for the reads, the rest of the plug typically will look black. However if the rest of the plug is wet, oily, of has a lot of black fluffy soot, you have an issue. Plug selection may not solve the issue. If you do a search here there is probably a lot of info on plug reads.

[Y-Blockhead]

Originally Posted by GerryAllen

Pat, please explain #8, is that an Auto Lite plug that would be more comparable to the W18 than the others?????

Gerry, I think Patrick was referring to Post #8.

Patrick, I seen some Autolite 3076 plugs on eBay https://www.ebay.com/itm/Spark-Plug-...-/201694271952 if you are interested?

[GerryAllen]

Thank you read post #8 ;~))))) and the other regarding 3076 verses W18. Will try W18.

[Patrick L.]

Originally Posted by GerryAllen

Thank you read post #8 ;~))))) and the other regarding 3076 verses W18. Will try W18.

I think thats a good choice.

[Patrick L.]

Originally Posted by Y-Blockhead

Gerry, I think Patrick was referring to Post #8.

Patrick, I seen some Autolite 3076 plugs on eBay https://www.ebay.com/itm/Spark-Plug-...-/201694271952 if you are interested?

Thanks, but. 3076 are readily available. 3077, which I prefer, don't seem to be.

[37 Coupe]

I have four like new W-20 Champion spark plugs .Are they close to the Champion 3 X plugs in heat range and are they a good plug to use in a stock engine that is probably in need of a rebuild or at least new rings and a valve job.