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alpinems

Solex
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  1. alpinems's post in Running Rich was marked as the answer   
    Just thought I update this topic with what I found. Turned out to be something I didn't expect at all. I have an Alpine (tube) style airbox feeding the dual Weber carbs. It's large and fills up most of the driver's side engine bay. So first order of business was to remove it before I start looking at the carbs - thinking I may need to pull them off and rebuild/tweak them.
     
    And lo and behold, after taking them off I noticed some oil on that side of the block. Which is weird as the block tilts the other way and that side should be clean. On closer inspection I found that one of the expansion plugs in the block had blown/fallen out. It was really hidden behind a bunch of stuff and hard to see. Why was it gone? I have no idea, as the system had plenty of antifreeze in it over the winter. Well the system was pretty low on coolant as you can guess. I put in a new expansion plug, topped off the coolant and let it run for a bit. A test ride of about 90 mins had it running warm but not hot - it was 90 degrees out, which was normal. The motor was singing again, no pinging, not running rich, just a pleasant car.
     
    I guess when I warmed up one or more of the cylinders would expand, letting the fuel pass through, thus the rich condition. Just a guess. But anyway, I think a dodged a bullet here as once it was running rough I would turn it off. Oh and another thing why I didn't catch it, the wire to the temp sensor was bad, so no temp reading while running. My focus was on the A/F meter showing a rich condition. Just putting it out there in case it helps somebody else.
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