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Join Date: Jul 2006
Location: Charlotte, NC
Posts: 1,964
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Twin plug distributor cap question
I'm chasing a misfire issue with my car. I suspected the carbs, which I've removed and cleaned, but now I'm looking into the ignition. I have a jb racing twin distributor. I removed the cap today to take a peek and not sure I like what I see. There is a ring in the top where the router has constant contact. This looks to be copper (???) and green in spots. Can I clean this up with emery? Also, the "tines" for the upper and lower plugs look significantly different. One is copper looking and looks fine. The other ones look like there was some kind of coating on them that the router has worn through where it touches. Or, something has built up around where the router touches. It's very hard to tell. I'll attach a picture below to see what you think. Not sure if I should attempt to clean it up or what.
Todd  
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'81 SC |
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10-09-2016, 01:11 PM
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Location: Portland Oregon
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That looks like an aftermarket version of the Marelli Jaguar cap and those are not very good quality.
If you cannot locate a genuine Jag cap, I would flush the inside of the cap with contact cleaner to remove all those tiny bits of aluminum as these represent a conductive path, causing misfires.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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10-09-2016, 02:00 PM
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It's a JB Racing cap.
Todd
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'81 SC |
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10-09-2016, 02:13 PM
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Todd,
They do not make their own caps; I've bought quite a few of these over the years.  There are several makers of Jag caps and the Italian one (cheapest) cause these issues. I use NOS Jag Marelli caps even though they are far more expensive since I cannot afford any trouble.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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10-09-2016, 04:26 PM
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Join Date: Oct 2005
Location: Northern California
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I am reviving this thread as I am having issues with my JB Racing-supplied, Italian-made distributor cap. The center button disintegrated.
Does anyone know which NOS Jag cap is the proper unit to use for a replacement?
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Mike PCA Golden Gate Region Porsche Racing Club #4 BMWCCA NASA |
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09-18-2018, 07:17 PM
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Racer
Join Date: Oct 2010
Location: Franklin, TN
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Quote:
Standard Motor Products (SMP) Prenco Beck/Arnley WD Express Which is the best and which is the worst? Thanks!
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Scott Winders PCA GT3 #3 2021 & 2022 PCA GT3 National Champion 2021 & 2022 PCA West Coast Series GT3 Champion |
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09-19-2018, 02:05 AM
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Location: Northern California
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JB Racing and Pelican Parts sell replacement caps for the JB Racing Distributors.
There are indeed a variety of companies that sell the Jaguar caps, but they are very likely all made in the same place in Italy. Marelli no longer make them, and NOS Marelli parts are hard to find.
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Mike PCA Golden Gate Region Porsche Racing Club #4 BMWCCA NASA |
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09-19-2018, 09:28 AM
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