Burnt the coil button out of the cap

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convertables_10
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Posts: 104
Joined: Wed Jul 21, 2010 9:18 am

Burnt the coil button out of the cap

Post by convertables_10 »

Pulled my distibutor tonight found that the center of the cap where the coil wire passes through was burnt rather badly with evidence of spark scatter. The entire inside of the cap had a white dusting. Wondering what i might look at to prevent this from happening again.

ms2 v3 gm 8 pin hei 355 sbc
My MegaSquirt build 85 S-15 Jimmy 350/th350 TPI MS2 2.905 hei 8pin
1983 s-10 350 tpi injection MS2 soon
1984 s-10 Blazer 350/th350 and will get an MS2 tbi.
1973 Nova 5.3/glide 76mm turbo. MS3X
trakkies
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Re: Burnt the coil button out of the cap

Post by trakkies »

convertables_10 wrote:Pulled my distibutor tonight found that the center of the cap where the coil wire passes through was burnt rather badly with evidence of spark scatter. The entire inside of the cap had a white dusting. Wondering what i might look at to prevent this from happening again.

ms2 v3 gm 8 pin hei 355 sbc
When i had this happen, I also had a poor connection at the coil - corrosion between the centre terminal and the HT king lead. Could also be the wrong plug leads or plug gaps.
Dave P, London UK.
Rover V-8
MSII V3
EDIS
Tech Edge Wideband
convertables_10
Helpful Squirter
Posts: 104
Joined: Wed Jul 21, 2010 9:18 am

Re: Burnt the coil button out of the cap

Post by convertables_10 »

I did burn a pair of plugs 2 weeks ago while i was at the track. Had to drive home on them. Normal gap for me is .035. Taylor leads all ohmed out correctly. Ill check the coil wire and all its connections. Hopefully i pick up some time on the intake swap.
My MegaSquirt build 85 S-15 Jimmy 350/th350 TPI MS2 2.905 hei 8pin
1983 s-10 350 tpi injection MS2 soon
1984 s-10 Blazer 350/th350 and will get an MS2 tbi.
1973 Nova 5.3/glide 76mm turbo. MS3X
TT350chevelle
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Re: Burnt the coil button out of the cap

Post by TT350chevelle »

I don't know what the deatails of your ignition setup, so this may not apply but burning the cap and rotor is a common problem when a high output coil is used. The factory center terminal is a carbon base and it can/will get hot with high output coils. Msd makes a center button that will eliminate this from happening again. http://www.jegs.com/i/MSD+Ignition/121/8412/10002/-1

Brad J.
Homebuilt Twinturbo 68 Chevelle
MS Extra code,fuel and spark control
355cid,3800lbs & 3.30-1 gears
ET 10.46@134mph with 19psi boost
convertables_10
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Posts: 104
Joined: Wed Jul 21, 2010 9:18 am

Re: Burnt the coil button out of the cap

Post by convertables_10 »

Im running the Gm remote mount hei. Stock coil Msd cap and rotor. Msd replaced the cap after I complained about it lasting less than 6 months. :yeah!: Distributor had a failing vr sensor in it as well. The center button is awesome on big cap hei. :lol: I believe Ive got it sorted out alot better than before but im gonna swap to edis when the motor comes out. :RTFM:
My MegaSquirt build 85 S-15 Jimmy 350/th350 TPI MS2 2.905 hei 8pin
1983 s-10 350 tpi injection MS2 soon
1984 s-10 Blazer 350/th350 and will get an MS2 tbi.
1973 Nova 5.3/glide 76mm turbo. MS3X
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