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Old 01-12-2013, 08:40 AM   #1
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Cop

Just wondering if anyone has bought any of the off brand cop on eBay? They have some complete sets of 8 for under 100 bucks. I just have never heard of some of the brands.
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Old 01-12-2013, 11:24 AM   #2
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From what I have heard and observed it is a crap shoot, with a 50/50 chance of long term success.

When creating my COPTesto-The-Destructor COP tester (see below) I asked people to send me bad COPs for in-depth testing. I received a bunch, including two sets of "eBay" specials each of which had one or more COPs fail in 20k miles or less as reported to me. Most of what I received were aftermarket COPs, Accel, MSD, Granatelli, etc.

Do you have a bad COP? In general if they work without problem they are not bad, or weak, as they are just high voltage transformers. Ford stated in a notice to dealers, asking for them to do better testing, that over 50% of the COPs replaced under warranty and returned to the factory had nothing wrong with them.

COPTesto (testing a WeaponX COP):



I call it "The Destructor" because firing a COP repeatedly in rapid sequence, and dumping 100% of its energy across a large gap, will cause it to overheat and burn out. The stock COPs can take 24+ such firings before burning out, most after market COPs are all done in 15 to 18 full dumps. In normal use a COP only discharges a small fraction of its full charge.

Some of the COPs I received:



In this photo is a set of Weapon X standard units with 5 burned out, a couple of burned out Accels, and front and center one of the "eBay" COPs.

Here is a video of a stock COP firing across a 16 mm air gap...
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 01-12-2013, 11:49 AM   #3
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Thanks for the info. I am thinking that I have a bad cop cause after the car warms up, I develop a miss when accelerating at lower rpm. I have changed plugs and that didnt help.
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Old 01-12-2013, 12:06 PM   #4
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Quote:
Originally Posted by shawnpbigelow View Post
Thanks for the info. I am thinking that I have a bad cop cause after the car warms up, I develop a miss when accelerating at lower rpm. I have changed plugs and that didnt help.
A sticking EGR valve can do that without throwing a code, how many miles on the engine?
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 01-12-2013, 12:46 PM   #5
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116k. I never thought of that. Should I turn it of with my tunner?
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Old 01-12-2013, 04:17 PM   #6
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The last 4-5 sets I've gotten have been off eBay

8 cops for $70. Can't beat that
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Old 01-12-2013, 05:08 PM   #7
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The last 4-5 sets I've gotten have been off eBay

8 cops for $70. Can't beat that
Did you run many miles on them?
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 01-12-2013, 05:13 PM   #8
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I'm not sure about a couple of them they were in cars i flipped but I have them in my f150 and in my mustang when my msd's went bad

---------- Post added at 05:13 PM ---------- Previous post was at 05:12 PM ----------

Flipped as in I buy and sell cars all the time
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Old 01-12-2013, 05:25 PM   #9
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Originally Posted by 02PONY View Post
I'm not sure about a couple of them they were in cars i flipped but I have them in my f150 and in my mustang when my msd's went bad

---------- Post added at 05:13 PM ---------- Previous post was at 05:12 PM ----------

Flipped as in I buy and sell cars all the time
The ones that were sent to me had 20k to 30k on them when they burned up, I had a set of Accels in which 5 burned up in over a span of 6 weeks at 25k miles or so.

There may be some "flippees" out there "flipping" you one right now
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 01-12-2013, 05:36 PM   #10
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I've got atleast 20,000 on the cops on my truck

I'm just saying its a decent to good alternative to get a full set of 8 cops vs 1 maybe 2 other brands
I like to replace all of them when one goes bad
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Old 01-13-2013, 10:39 AM   #11
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I was just a little leery. Usually you get what you pay for with car parts.
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