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Old 08-23-2006, 04:12 PM
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2 Dead Cylinders....

I've got a 355 SBC with 12.5:1 compression, old double hump heads, Weiand single plane intake, rebuilt Holley double pumper, I'm not sure about the cam except that it's an "Elgin". I don't know if it's Elgin or Elgin Industries. I have no specs on it. The ignition is an MSD coil with a Mallory mechanical advance distributor.

My number 8 and number 6 cylinder header tubes are cold. I have spark and compression in both cylinders.

I have new plug wires as of today.

I've replaced the intake manifold gaskets.

The rockers for both cylinders seem to be moving properly and the pushrods don't look bent.

There's no vacuum leak at the manifold.

I checked the new plug wires too, just to be sure I didn't have a bad set.

The plugs are dry in both cylinders.

The passenger side of the engine is backfiring, so I assume there's excess fuel getting into the muffler and eventually igniting because the two cylinders aren't burning fuel.

I don't know much about the engine. It came with the car. The car was raced. It may just be tired.

Any ideas besides a bad cam?

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Old 08-23-2006, 04:40 PM
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Nevermind. It's fixed.

Thanks.
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Old 08-23-2006, 04:42 PM
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Well....don't leave us hanging...tell us what it was. I bet you had some wires crossed.
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Old 08-23-2006, 06:20 PM
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Crosswired...... huh
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Old 08-23-2006, 06:57 PM
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Someone had some wires crossed, but it wasn't me. I pulled the wires on this car maybe 4-5 times, but only from the plugs. Anything at the cap was pre-existing. And today when I changed the wires trying to fix the problem, I put them back where they were, so I guess they wrong from late last September when I got the car. Which would explain a few things.

We won't get into whether I should have known they were wrong to begin with......

But yeah, number 6 and number 8 were mixed up. I had 1-6-4-3-8-5-7-2 instead of 1-8-4-3-6-5-7-2.

So now this thing just may make it onto the street for a few weeks this year. A few hours ago, I figured it was over for this year and the engine was coming apart. Lucky me!

Last edited by Unkie; 08-23-2006 at 07:05 PM.
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Old 08-23-2006, 09:22 PM
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Thank you for the good lesson.

Never overlook the obvious. K.I.S.S. Keep It Short Simple.



Note to self:

That is interesting. The plugs were DRY because they were firing during overlap, and yet the exhaust was AFTERfiring. (back-firing is through the carburetor)

Last edited by xntrik; 08-23-2006 at 09:42 PM.
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