Dodgy NGK spark plugs
#1
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After wasting hours trying to tune my reconditioned 2" SU's, I discover #6 spark plug had gone out to lunch.
A brand new plug bought in a set on e-bay,
Further investigation showed country of manufacture is Thailand. The old NKG's I used were Japanese.
I am starting to suspect the quality or otherwise reputable brands of parts being sold on-line.
Just curious if anyone else has had issues with spark plug quality, in particular?
A brand new plug bought in a set on e-bay,
Further investigation showed country of manufacture is Thailand. The old NKG's I used were Japanese.
I am starting to suspect the quality or otherwise reputable brands of parts being sold on-line.
Just curious if anyone else has had issues with spark plug quality, in particular?
#2
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S-Type Owner (03-10-2024)
#3
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#4
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I like NGK plugs, when their OHMs are measured, they're always bang on because they're wire wound.
I'm not sure what's used in other plugs, probably carbon, but the resistance in those can vary by 200 ohms, + or -.
I suppose in the end it doesn't matter, but I had an incident once where my Dad's 59 Chev truck simply refused to start, and I traced the problem down to the resistor plugs.
I took one apart and the resistor inside was this white crumbly mess of something that was oxidized to nothing.
They were Chumpion plugs, never touched them again.
I'm not sure what's used in other plugs, probably carbon, but the resistance in those can vary by 200 ohms, + or -.
I suppose in the end it doesn't matter, but I had an incident once where my Dad's 59 Chev truck simply refused to start, and I traced the problem down to the resistor plugs.
I took one apart and the resistor inside was this white crumbly mess of something that was oxidized to nothing.
They were Chumpion plugs, never touched them again.
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Glyn M Ruck (03-20-2024)
#5
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It's not relevant now, apart from showing spark plugs aren't all the same. But, in the early 1980s, when I had an interest in spark ignition, I tried a range of makes in the Mk2. Judged on the basis of the endurance of a new set in the car, the absolute best were Golden Lodge. They seemed to go on indefinitely, real fit and forget, unlike the manufacturer who are long gone. Bosch were fairly new into the market. I tried them mainly because I'd met some of their engineers. However, their plugs were not very good. I was quite lucky if they reached more than a few hundred miles before a misfire. Of course, spark plug technology has moved on by leaps and bounds since then.
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Glyn M Ruck (03-08-2024)
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#12
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#13
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was wondering if it can be called a "swiss watch" if made in Thailand, but quickly realized i just ate a ham and swiss cheese sandwich this afternoon and the cheese was labeled "Tillamook" and made in Oregon. haha
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Glyn M Ruck (03-11-2024)
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It's purely assembled in Thailand Huey. All parts are Swiss made.
#16
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It's worth remembering that the origins of the Swiss watch industry were, at least in part, in cheap, mass produced watches. It turned out that mass produced wasn't only a lot cheaper, but ultimately also much better quality. There are definite cycles in the production of goods and the relocation of manufacturing seems to be tightly bound to those cycles.
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Glyn M Ruck (03-12-2024)
#17
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Sorry to semi-hijack this thread but I was about to ask about spark plugs and wires anyway.
My car is a 66 3.8 9:1 compression, manual trans. I have completely rebuilt the engine and have a pertronix distributor and matching (recommended) coil. The original distributor is still around but in a very sad state. The pertronix unit came with the car.
What would you recommend for plugs and wires? I know I either need resistance wires or resistance plugs. I thought this would be easy but the usual US suppliers (SNG and Moss) seem to be out of many plugs and don't provide any guidance. I'm going for a fairly stock look so no neon green wires, please.
My car is a 66 3.8 9:1 compression, manual trans. I have completely rebuilt the engine and have a pertronix distributor and matching (recommended) coil. The original distributor is still around but in a very sad state. The pertronix unit came with the car.
What would you recommend for plugs and wires? I know I either need resistance wires or resistance plugs. I thought this would be easy but the usual US suppliers (SNG and Moss) seem to be out of many plugs and don't provide any guidance. I'm going for a fairly stock look so no neon green wires, please.
Last edited by cdg66mk2; 03-18-2024 at 08:01 PM.
#18
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Sorry to semi-hijack this thread but I was about to ask about spark plugs and wires anyway.
My car is a 66 3.8 9:1 compression, manual trans. I have completely rebuilt the engine and have a pertronix distributor and matching (recommended) coil. The original distributor is still around but in a very sad state. The pertronix unit came with the car.
What would you recommend for plugs and wires? I know I either need resistance wires or resistance plugs. I thought this would be easy but the usual US suppliers (SNG and Moss) seem to be out of many plugs and don't provide any guidance. I'm going for a fairly stock look so no neon green wires, please.
My car is a 66 3.8 9:1 compression, manual trans. I have completely rebuilt the engine and have a pertronix distributor and matching (recommended) coil. The original distributor is still around but in a very sad state. The pertronix unit came with the car.
What would you recommend for plugs and wires? I know I either need resistance wires or resistance plugs. I thought this would be easy but the usual US suppliers (SNG and Moss) seem to be out of many plugs and don't provide any guidance. I'm going for a fairly stock look so no neon green wires, please.
https://www.rockauto.com/en/catalog/...park+plug,7212
DENSO 3027 Pre-Set Gap: 0.032" Non-Resistor OE gap of 0.035"
NGK 1233 V-Power; Pre-Set Gap: 0.032" OE-Recommended Gap: 0.035" (my choice)
CHAMPION 38 Copper Plus; Pre-Set Gap: 0.032" Non-Resistor Type; OE Type; OE-Recommended Gap: 0.035"
NGK 7734 Standard; Pre-Set Gap: 0.036" OE-Recommended Gap: 0.035"
Wires
DENSO 6716140 7mm
STANDARD MOTOR PRODUCTS 55426 Intermotor
NGK 54393
UNITED MOTOR PRODUCTS 9613 United-Packard Premium Wire Set
Rgds
David
PS: Be sure to do initial timing of the Pertronix Distributor to their instructions (available on their web-site), not the jaguar workbook instructions.
Last edited by David84XJ6; 03-18-2024 at 11:08 PM.
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#20
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6 x Spark Plugs Made in Japan NGK V-Power 7327 BP5EY 7327 BP5EY Tune Up Kit Set
yesautoparts US $19.97
Rgds
David
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