General Category => Engine & Transmission => Topic started by: SIMPLEXUSA on August 04, 2013, 08:25:22 AM
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Anyone know a spark plug number for a 1948? I think its an H motor. I tried to find a B4H. (NGK) no part stores had them. will any other plugs work? thanks.
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BP4HS should run nicely in these motors . The protruded tip should be advantageous to a better burn .
Being such a low compression motor , I can't imagine the tip would be a problem .
You can see how they compare :
(http://i200.photobucket.com/albums/aa28/pdcomm/ngk_sym.gif)
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Thank, but it did not work. electrode too long. it hits the piston. available room is 17mm before it hits the piston. in need a 16mm or so. the plug you recommended was 17.5mm.
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Champion J8C available at Walmart.
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Thanks, just picked up the AC DELCO version . Part # R45 thanks for all the help
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Thank, but it did not work. electrode too long. it hits the piston. available room is 17mm before it hits the piston. in need a 16mm or so. the plug you recommended was 17.5mm.
Well , learn something new every day . I really did not know . Sorry to have sent you on a goose chase , but now we all know . Thanks for the information .
I've never had a protruded tip interfere . But , I never tried one in an older designed chamber either .
Pete . :)
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Will the champion J8C work for all motors? I have an M motor 55' I think.
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Will the champion J8C work for all motors? I have an M motor 55' I think.
That's what I have. I think they all use the same plug.
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So , I'm just guessing that Champion plugs work OK in our motors , performance wise .
Normally , Champion plugs would not be my first choice , but ...
Pete . :)
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So , I'm just guessing that Champion plugs work OK in our motors , performance wise .
Normally , Champion plugs would not be my first choice , but ...
Pete . :)
I have run NGK, champion and a motorcraft and I could not see a difference.
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Good to know that we shouldn't have to shy of using one plug or another .
Pete . :)
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Simplex OEM plugs were Autolite. 2HP engines (Pre-war) used a B-5 (now 386), 3 HP engines (iron cylinder with zinc crankcase) used an A-5 (now 303), and later aluminum engines used an A-7 (now 295). I prefer the Autolite over Champion because Champion has a higher resistance than other brands. It makes any weakness in your ignition worse. I have had ignition problems with several engines that I finally traced to defective Champion plugs. I have had fewer problems since I stopped using Champion plugs. Many professional mechanics also will not use Champion plugs for the same reasons. Also do not use resistor type plugs in any vintage engine. The resistor shortens the spark duration to reduce potential interference with aircraft communications, as mandated by the federal government. It takes away some of the spark from both ends of the fire.
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I will not use Champion plugs , unless nothing else is available , which isn't very often these days .
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Hmmm....that's interesting. I've used Champions for years without issue. I bought the entire parts department from an AMC dealership a few years ago & have enough Champion plugs to last my lifetime (plus a few autolites too). I have Champs in the simplex now, but I guess it would be cool to have original brands that were used in it.
I'll have to finish my plug wrench I stared last week (I took one of those sheet metal tube type plug wrenches that come in a jap motorcycle tool bag & bandsawed down the length of most of it to create a handle to bend over...I just have to put a little weld on the bend to make it strong enough).
BTW, those one piece autolite plugs made for Model T's (and IHC farm tractors) sure don't hold up in a Model T like the 2 piece Champion X plugs.
Mike Sal
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My grandfather owned a service station for years and always swore by champion plugs. To each his own. Like I said, I have tried 3 different brands and could not tell a difference.
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Me myself I am not fond of the height of the plugs. There's no room to work the plugs under the tank. I'mlooking for a good replacements that are short topped plugs for clearance. Never liked sparks that close to gas and oh how hard is it to just to pull a plug out. But on brands I can go any way even thou I prefer autolights I do use others. :P
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Does anyone know if the length of the porcelain has something to do with the heat range of a spark plug .
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Wayne sells a short, modified socket wrench to get to the plugs under the tank. It's perfect for the room available!! Mike
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I took an old box end wrench and ground a little here and there . Bent a little here and there . It works just fine . It does not look exactly OEM , but ... ;)
Pete . :)
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thanks a lot Rick
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What does everyone make of this wrench? Authentic? I bought one once that was described as a Simplex wrench but turned out to be poorly made but resembled this one. Got this one off of Ebay at a pretty low price and couldn't let it go. It does fit the sparkplug!
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How deep is the 'socket' , Tom ?
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Tom, I made those so I could make a fortune and retire! I just stamped the SIMPLEX name on them to triple the price! LOL
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The socket is 5/8" tall. handle is 3/4" X 5 1/2" long and an 1/8" thick.
You out did yourself on this one Rick!
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Tom, on a serious note, that looks pretty authentic to me. Nice find!
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Agreed . I think you found a rare piece , Tom .
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Here's a site that shows what seems to be all alternatives to NGK B4H :
http://www.sparkplug-crossreference.com/
Details about NGK B4H:
Threaddiameter: 14mm
Threadreach: 12.7mm
Seattype: flat
Hexsize: 21mm
Tipconfiguration: non projected
Construction: Standard construction
Terminaltype: Removable
Replacement spark plugs for NGK B4H:
Brand Model
AC Delco
420Z
AC Delco
46F
Accel
156
Autolite
417
Autolite
425
Autolite
536
Beck Arnley
176-9022
Beru
14-10A
Beru
95/14
Bosch
W10A
Bosch
W10AC
Bosch
W125T1
Bosch
W125T4
Bosch
W12A
Bosch
W45T1
Bosch
W8AC
Bosch
W95T1
Bosch
W9A
Bosch
W9A0
Bosch
W9AC
Bosch
WR8AP
Bosch stk
7502
Brisk
N19
Brisk
N19C
Carlton
71065
Carlton
C10S
Champion
896
Champion
L14
Champion
L14-U
Champion
L90C
Champion stk
896
Daihatsu
90048-51020-000
Denso
4012
Denso
W14F
Denso
W14F-U
Denso
W14FU
Denso stk
4012
Eyquem
200
Eyquem
502 MOTO
Fuji
065-01400-20
Fuji
065-01401-10
General Motors
5613658
Gutbrod
090.33.668
Honda
98076-54710
Honda
98076-54770
Iskra
F20
Isolator
M14-95
Isolator
M1495
KLG
F20
Kubota
13281-6771-6
Kubota
13641-6771-1
Lodge
B14
Lodge
BN
Magneti Marelli
CW25N
Magneti Marelli
CW2N
Magneti Marelli
CW3N
Magneti Marelli
CW4N
Magneti Marelli
CW4NJ
Mighty
M4E4
Motorcraft
AE6
Motorcraft
AE7
Motorcraft
AES4C
Motorcraft
AV6
Motorcraft
AV6CU
Motorcraft stk
41
NGK stk
4110
PAL (Brisk)
14-5
PAL (Brisk)
N19
Prestolite
1,40E+004
Splitfire
SF265F
Yamaha
94703-00001
Yanmar
160232-78010
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I know a lot of us use the NGK B-4H plug with good success, but I recently encountered an issue. I was test assembling an M motor, no gaskets in place. I am using a .030 longer rod in this motor and found that the piston hit the spark plug. I installed a cylinder gasket and had clearance. This led me to measure the spark plug thread length. This measured 13.3 mm to the tip. I pulled out an Autolite 295, this measured 10.5 mm. I then looked up the specs online and found that an NGK B-4 is really the replacement for the Autolite 295, not the NGK B-4H that we usually use. Without the longer rod, this wouldn't matter.
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Champion J8C available at Walmart.
Is the same as the Champion CJ8?
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Champion J8C available at Walmart.
Is the same as the Champion CJ8?
Not CJ8, but J8C. I din't have one to measure, so I am not sure.
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Why not use :
http://www.sparkplug-crossreference.com/convert/CHAMP_PN/cj8
Pete . :)
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Why not use :
http://www.sparkplug-crossreference.com/convert/CHAMP_PN/cj8
Pete . :)
CJ8 and J8C are not the same plug, fwiw.
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I have a CJ8, it fits but I have no idea what the heat range is. Pretty short overall.
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Details about Champion cj8:
Threaddiameter: 14mm
Threadreach: 9.5mm
Seattype: flat
Hexsize: 19mm
Details about Champion J8C:
Threaddiameter: 14mm
Threadreach: 9.5mm
Seattype: flat
Hexsize: 21mm
Here's a heat range chart :
http://www.briskusa.com/spark_plug_cross_reference_heat_range_chart
Pete . :)