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#1
04-29-2009, 05:47 PM
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Do I need to upgrade my spark plug wires - '72 250?
I have a Crane installed on my 250 with the Fireball coil and have no problems with it - NGK plugs gapped to .042". I am looking to replace the wires and was wondering if the standard Bosch wires would be fine, or should I look for something else? If so, any recommendations?
ryan
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RG Newell 1984 300D 1972 250 1986 560SL 1991 300CE 
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#2
04-29-2009, 05:59 PM
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Use the standard Bosch wires and also use Bosch non-resistor type spark plugs. Bosch plugs are much better then NGK's.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#4
04-29-2009, 09:40 PM
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In this car ('72 250), I've had better luck with the NGK plugs. I was just making sure that the Bosch plug wires could handle the 'beefed up' ignition coil...
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RG Newell 1984 300D 1972 250 1986 560SL 1991 300CE
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#5
04-30-2009, 09:51 AM
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I use the NGK's and they are fine, plug wires should be fine as well
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD  16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#6
04-30-2009, 12:33 PM
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Your original wires are/were a solid core wire with a resistor added to the spark plug end. These wires are superior to the cheaper fiber core resistance types being pushed off on us now by makers, like Bosch. If your original wires are not cracked and the original resistors are still intact I'd keep them and not worry about their ability to handle the Crane. As an alternative, you could get replacement resistors ends and some solid core wire from a good parts house and make up a set. Also, go with the NGKs...Bosch has dropped their non-resistor plugs from the catalog.
230/8
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#7
04-30-2009, 01:00 PM
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Actually, my current wires are Bosch replacements from several years ago. I was concerned about their quality when I installed them, but went ahead...
What about Kingsborne wires? I bought a set of these for my 560SL and they seem to be high quality - but I don't know if they are solid core or not?? I'm not positive the Bosch ones I currently have are either though...The Kingsborne for my 250 are quite a bit more - $62.00, I think. ryan
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RG Newell 1984 300D 1972 250 1986 560SL 1991 300CE
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#8
05-01-2009, 12:25 PM
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Don't know anything about that brand. This outfit seems to have a good website and info if you are interested to know more.
Website: http://www.magnecor.com/ Catalog: http://www.magnecor.com/magnecor1/files/catalog.pdf I did note in their catalog they indicate their wires are designed for high output systems like the Crane. Haven't used their products so you might ask this forum sponsor for OEM product information if you have doubts about what to use. 230/8
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#9
05-01-2009, 03:31 PM
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Some night after dark and in a dark place, watch the wires with the engine running. Use "averted vision" which means don't look directly at the wires but just to one side. If you see a slight glow or small sparkles, think about new wires. If not, you are OK. Do make sure that the wire is properly seated into the sparkplug end. On my 250C, they were threaded in and tended to come out.
Michael
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Usta haves '69 250/8, '76 280C, 1971 250C 114.023, 1976 450SEL 116.033 Current have, 1983 300SD 126.120
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#10
05-01-2009, 04:23 PM
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perfect reply "250 Coupe" I used to be able to see the "purple glow" on the Raja clips of the old days.
Now another one or two, I wash the motor and see if it starts, "the water test" or hold the underside of your arm parallel to, but not touching, leakers will raise the fine hair, "the feely test"
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