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allisbred 
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Joined: 28 Mar 2015
Location: Hanover Pa
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 Topic: CA spark plugs
Posted: 26 Feb 2018 at 8:51pm |
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I noticed that A295 plugs do not make it to the chamber on the CA. Looks like it needs another 3/8" to make it. What would be a good alternative for medium heat range, non resistor? I'm just taking a guess that the 45 could be the same way?
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Bill Long
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Joined: 12 Sep 2009
Location: Bel Air, MD
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Posted: 26 Feb 2018 at 9:04pm |
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Get in touch with SteveNJ. He is our resident expert on electrical.
I can tell you when we sold them new we used AC45 - AC48 depending on the engine condition. They worked fine but that was then. Now I understand the AC plugs are not so good. Lot of people on this site like Auto Light.
Hey, if you are from Hanover PA and you are unaware, there are some great Allis People near you. Fred Wilke for one. He has an outstanding collection of Allis and John Deere.
We just had an Mid Atlantic Allis Chalmers Club meeting there.
Take good care of that CA. Neat tractor.
Good Luck!
Bill Long
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allisbred
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Location: Hanover Pa
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Posted: 26 Feb 2018 at 9:27pm |
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Do you by any chance remember how long the original AC-45's were? I was wondering if plugs ever changed length during any rationalizing of part numbers over time? I also looked at some 3/4" reach as well, they are about 1-2 threads too long ( threads exposed in chamber could cause a problem removing down the road). I have met a few AC guys local, all been great people with a lot of knowledge.
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Steve in NJ
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Posted: 26 Feb 2018 at 9:29pm |
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Why do you think the plug should be deeper into the combustion chamber? Just curious...
Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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steve(ill)
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Posted: 26 Feb 2018 at 9:32pm |
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The 295 plugs fit in the B and C heads........ why don't they work in a CA ?
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Like them all, but love the "B"s.
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ac45dave
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Posted: 26 Feb 2018 at 9:49pm |
ca calls for 295 or 303 "3/8" reach plug in auto light.depends on if you want resistor or non resistor plug.the 295 non resistor is a little hotter plug according to their heat range chart. allis application list 295 specs w/link to heat range cgart
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54 wd-45gas ; 56 wd-45d N/F w/fact p/s ; 63 d-17 sIII N/F gas ; 60 D14 N/F ; 67 d-17 sIV N/F gas ; 63D15 sII W/F; 39rc#667 ; 2021 massey 4710 fwa ; gravely 2 wheel tractors
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PaulB
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Posted: 27 Feb 2018 at 1:38am |
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NGK. B6S
Edited by PaulB - 28 Feb 2018 at 1:53am
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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allisbred
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Posted: 27 Feb 2018 at 6:59am |
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Steve, I have tried several plugs all were 3/8" reach and worked fine(some better than others). I am finally catching up on my winter projects and a valve job on the CA was in line. I noticed when I pulled the head that the 3/8" reach plug is not visible in the combustion chamber at all. Looking at it, there are no clearance issues with valves or the piston. I am far from an expert on this issue, it just doesn't seem to me that the short plugs would be as efficient as a longer reach plug that makes it to the chamber. I remember putting short plugs in my old jeep because that's all I had in a pinch, they ran like crap and fouled out very quickly. I can't post pictures on here from my phone but would be glad to share some if anybody would like them texted. I know many do not like champion plugs on here but I also tried them with good results. Paul-- thank you, I will try the NGK B6. Thank you all
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DougS
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Posted: 27 Feb 2018 at 7:44am |
Into the combustion chamber? I usually see the thread just flush with the head when the plug is seated all the way. The electrode may extend a little into the chamber, but the threads should always be flush.
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allisbred
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Posted: 27 Feb 2018 at 8:19am |
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Doug, That is what I expexted to see, threads flush/or near to the inside of the chamber. I do not know the thread depth on B/C's or if there is a veriance in head castings on the CA, just going by what I see here on this head.
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drobCA
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Posted: 27 Feb 2018 at 9:57am |
hmmm... we're igniting a gas cloud here. I wonder which would be more efficient - an explosion started in the center or one that starts on one edge and ripples through. of course we are talking about a fraction of a second, here...
pretty sure I can predict which would be more destructive to the spark plug.
just thinking out loud here - anybody know of any testing in this area?
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3 Ford 8N's I loan to neighbors, but the '52CA, '41B and little B1 I do not.
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DougS
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Posted: 27 Feb 2018 at 10:37am |
It does not explode, drobCA. It burns. I'd say the difference between an explosion and a rapid burning it that with an explosion the entire amount ignites simultaneously. With a burn the burn starts at the plug and rapidly moves away, igniting the mix as the flame travels.
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Gary
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Posted: 27 Feb 2018 at 11:28am |
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A source of ignition within an vapour that will burn results in an EXPLOSION.
A source of ignition at the surface of a liquid that will burn results in a FIRE, not an explosion.
Gary
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