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Small cap hei eatting caps & rotors
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TSHACK
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PostPosted: Sun Aug 01, 2010 5:00 pm    Post subject: Small cap hei eatting caps & rotors Reply with quote

I wanted to throw this out, to see what you folks think. My 87 camaro Keeps eating distributor caps & rotors Crying or Very sad , Every 6 to 9 months. thats 8000 to 10000 miles Shocked . I think its the dust from the dirt road (2.25 miles each way) I have to drive to & from My house. can I seal up the distributor? Oh I have only been using msd caps & rotors. Thanks in advance.
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clay
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PostPosted: Sun Aug 01, 2010 8:09 pm    Post subject: Reply with quote

Specifically what is happening to the rotor / cap? Are the terminals getting eaten away? Clay
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TSHACK
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PostPosted: Sun Aug 01, 2010 8:45 pm    Post subject: Reply with quote

Oppss Embarassed yes burnt & ugle build up.
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10sec.et
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PostPosted: Mon Aug 02, 2010 3:26 am    Post subject: Reply with quote

if i had to guess, i would say its high resistance. how clean are the threads for the spark plugs ? any paint ?
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af2 wrote:
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TSHACK
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PostPosted: Mon Aug 02, 2010 10:33 am    Post subject: Reply with quote

Thats interesting thought, These heads have a bunch of miles on them. So i wouldn't think paint, But maybe other crud I'll run through them this weekend, checking the threads. The plug cables are fairly new About a year old. descent one Msd's, street fire spiral core. Thanks 10.
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dawg
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PostPosted: Mon Aug 02, 2010 12:08 pm    Post subject: Reply with quote

MSD caps and rotors have been having issues with their caps and rotors with corrosion and buildup on the contact surfaces.
try another brand and the problem will fix itself.
you can drill a few holes in the dist cap for a fix aswell.
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TSHACK
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PostPosted: Mon Aug 02, 2010 1:15 pm    Post subject: Reply with quote

The store didn't have a MSD this time. Only an off brand & Accel I picked up the Accel. Installed it last night. It smoothed the engine right up, Again.
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Big Dave
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PostPosted: Mon Aug 02, 2010 1:36 pm    Post subject: Reply with quote

dawg wrote:
MSD caps and rotors have been having issues with their caps and rotors with corrosion and buildup on the contact surfaces.
try another brand and the problem will fix itself.
you can drill a few holes in the dist cap for a fix aswell.


The problem could be the build up of corrosive Ozone gas due to all the arcing inside the cap. As DAWG stated a couple of holes in the cap will vent the gas. This goes for every brand of cap and rotor.

MSD has a "thing" about transmitting as much power as possible to the plugs so they knowingly choose a copper alloy that has a very low resistance to electrical current, but at the same time is very susceptible to corrosion. Contrary to popular belief the voltage is controlled not by the coil windings but by the resistance in the spark plug circuit. Once current starts to flow voltage in the coil will not get any higher. So a large spark gap with resister plugs to keep the power from leaking out before the plug fires is important if you want a lot of voltage for bargging rights.

Since A CD is a multi spark system I keep a tighter gap and let the voltage fall where it may; as I want current flow not high voltage to light off the fuel air mixture. It is the current that heats the air in the combustion chamber to fire the charge not the voltage needed to jump the gap.

Big Dave
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TSHACK
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PostPosted: Tue Aug 03, 2010 3:08 am    Post subject: Reply with quote

How much gap are u running Dave. It seems like i put the plugs at .032 on auto lite platinum. I may be wrong. There the same age as the last cap , rotor & plug wires. I changed them just before my last smog test, (early last Sept). It seemed like a good time. But it needed the cap & rotor. Could that little vent screen on the bottom plate of the dist be clogged wounder?
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Big Dave
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PostPosted: Tue Aug 03, 2010 10:45 pm    Post subject: Reply with quote

I run 0.32" as well. Normal gap for an HEI plug is closer to .054"-0.060"

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af2
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PostPosted: Tue Aug 03, 2010 10:59 pm    Post subject: Reply with quote

TSHACK wrote:
Could that little vent screen on the bottom plate of the dist be clogged wounder?


Drill 3/8" holes between the lugs in the middle of the cap.
When I put the trigger on my heap I pulled the electrics out and now have a big window.

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TSHACK
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PostPosted: Tue Aug 03, 2010 11:18 pm    Post subject: Reply with quote

af2 wrote:
TSHACK wrote:
Could that little vent screen on the bottom plate of the dist be clogged wounder?


Drill 3/8" holes between the lugs in the middle of the cap.
When I put the trigger on my heap I pulled the electrics out and now have a big window.




wow that big ok. thanks adam

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10sec.et
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PostPosted: Wed Aug 04, 2010 1:41 am    Post subject: Reply with quote

af2 wrote:



holy crap!!! look at all that dust. get that thing out of the garage and run it !!!!!!! Burn Out

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dawg
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PostPosted: Wed Aug 04, 2010 10:24 pm    Post subject: Reply with quote

another thing is if your running aluminum heads they need to be grounded to the engine and frame!
sounds silly but youll notice a better spark and burn.
I had the same crap build up on my MSD dist. cap and rotor but doing the grounds helped a ton!
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af2
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PostPosted: Wed Aug 04, 2010 10:45 pm    Post subject: Reply with quote

10sec.et wrote:
af2 wrote:



holy crap!!! look at all that dust. get that thing out of the garage and run it !!!!!!! Burn Out


As to Dawg! Good advice!
As to 10? that was 2008 when I changed a bunch of stuff and ran a 10.008 with Dextron on the slicks.

Time flies!!!!!!!!lol
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