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NO combustion in 2 of 8 cylinders

 
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SoCoCrush
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PostPosted: Sun Jul 17, 2011 3:32 am    Post subject: NO combustion in 2 of 8 cylinders Reply with quote

Have an old ski boat with a chevy small block V8 engine in it.The motor is 85-87. I currently have great compression in all 8 cylinders (115-135) but am not getting ignition in 1 and 3. Holley carb with the two barrels in the back and one combined on the front. Kind of a rookie but checked wiring order, spark for each and even pulled the valve cover off to see if there was a cracked spring or bent rod but everything is fine from that point. New plugs all around and after one day on the lake at 8 miles an hour the functional cylinders had some blackness but the 1 and 3 plug looked like they were fresh out the box, shiny and new. She ran great all last season but after being stored for the winter she has been a no go so far. Did not fade to this. More, all of a sudden over the winter.Starter fluid kills it, not accelerates.

It seems as if I am not getting fuel to just those two cylinders. Maybe too much? Any ideas?
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SMOKEmUP
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PostPosted: Sun Jul 17, 2011 3:47 am    Post subject: Reply with quote

How do you know 2 of 8 cylinders are not firing?
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SoCoCrush
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PostPosted: Sun Jul 17, 2011 3:51 am    Post subject: Reply with quote

When I pull the wires of the #1 plug nothing happens. When I pull it off the #3 plug nothing happens. When I pull any other plug wire the engine dies. Apparently can't run on 5 cylinders. That and the shiny clean plugs came out of the #1 and #3 cylinders. All 6 of the other ones are functional at this point and their plugs looked like there was combustion.
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10sec.et
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PostPosted: Sun Jul 17, 2011 2:54 pm    Post subject: Reply with quote

do you get spark from the wires on the misfiring cylinders ? if you had spark and too much fuel, the plugs would be black. without being there and looking at it myself, my best suggestion is new cap, rotor, and wires.
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squeeezer
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PostPosted: Sun Jul 17, 2011 8:27 pm    Post subject: Reply with quote

what style magnetic pick up on the distributor?
cap n rotor ok?wires?

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clay
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PostPosted: Mon Jul 18, 2011 12:59 am    Post subject: Reply with quote

Any chance something could have stopped the exhaust manifold up for those two cylinders? It's a long shot for sure, but something to check when you're out of ideas. Clay
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SoCoCrush
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PostPosted: Mon Jul 18, 2011 11:03 am    Post subject: Reply with quote

New cap and wires two years ago. Getting spark just no ignition. Any way to tell if I'm getting fuel at all in those two?
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SMOKEmUP
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PostPosted: Mon Jul 18, 2011 12:09 pm    Post subject: Reply with quote

SoCoCrush wrote:
New cap and wires two years ago. Getting spark just no ignition. Any way to tell if I'm getting fuel at all in those two?

New cap and wires two years ago doesn't mean they are good.

With a carburetor it's highly unlikely you're not getting fuel to only these two cylinders. Best thing to do is pull it and rebuild it.

Is this an HEI distributor or points?

How about swapping plugs around. Say take cylinder #1 and swap it with a working one, say cylinder # 2 and see if the problem follows. That way you can rule out a plug. Then do the same with a wire.

What about corrosion? Any chance the intake, exhaust manifolds, and/or cylinder heads rotted through?

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Last edited by SMOKEmUP on Mon Jul 18, 2011 12:27 pm; edited 2 times in total
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af2
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PostPosted: Mon Jul 18, 2011 12:16 pm    Post subject: Re: NO combustion in 2 of 8 cylinders Reply with quote

SoCoCrush wrote:
Holley carb with the two barrels in the back and one combined on the front.


Are you sure you are looking at the carb correctly?

Sounds like an old 3 barrel Holley with the secondary single blade that was flowed at 900 cfm.
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