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Registered
Join Date: Jan 2004
Location: CT
Posts: 11,538
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Help - Bosch Twin Plug Distributor Cap & Rotor
My RSR 3.0 twin plug motor has developed a significant intermittent misfire. Suspecting an ignition problem and knowing that my 10 year old Jerry Woods modified SC Bosch distributor still had the original cap and rotor, I checked there first.
    The inside of the cap shows what looks to be oxidized copper (green dust). The contacts on both the cap and rotor show significant corrosion. I expect this is the cause of the misfire. The original Bosh twin plug caps and rotors are very costly. Anyone have experience with the reproductions that are now available and know where to get one?
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Tom Butler 1973 RSR Clone 1970 911E 914-6 GT Recreation in Process Last edited by tom1394racing; 04-30-2018 at 04:13 PM.. |
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04-30-2018, 12:03 PM
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Registered
Join Date: Sep 2015
Location: Costa Rica and Pennsylvania U.S.
Posts: 3,301
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cap twin plug
Clean the cap and contacts and drill two 4 mm holes in the top to help vent out the green dust which is metallic in origin and will contribute to a crossfire.Fred
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05-01-2018, 03:54 AM
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Join Date: Jan 2004
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Thanks Fred...Worth a try.
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Tom Butler 1973 RSR Clone 1970 911E 914-6 GT Recreation in Process |
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05-01-2018, 04:36 AM
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Registered
Join Date: Jun 2003
Location: Camarillo, Ca.
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Hi Tom, Supertec and myself have re-pop 3.0 RSR caps and rotors for not a lot of $. Be advised, You may have to fuss with the rotor for proper fit. Check with Henry for pricing.
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Aaron.  F.S. 1965 Solex engine w carbs/cleanerBurnham Performance https://www.instagram.com/burnhamperformance/ |
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05-01-2018, 06:33 AM
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Functionista
Join Date: Jul 2011
Location: CO
Posts: 7,717
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Perhaps unsightly, but you can vent the cap using a hose going to fan shroud like the 964. Venting distributor from fan shroud through a small fuel filter would help with crossfire when using large gaps. The previous sentence sourced either from Grady Clay or from Porsche Fuel and Ignition training class but I can’t recall which.
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Jeff 74 911, #3 I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible. |
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05-07-2018, 08:13 PM
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