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Carbs fixed, but still runs rough

To: <healeys@autox.team.net>
Subject: Carbs fixed, but still runs rough
From: "Mick VanderPloeg" <MVANDERPLOEG@nc.rr.com>
Date: Sun, 9 May 2004 16:32:39 -0400
A few weeks ago, I was trying to adjust the mixture on my "H" type
carburetors, & accomplished nothing other than causing a fuel leak.  So, I
rebuilt the carbs (with the jets polished smooth), and it appears that the
leak has indeed been stopped.  While I was in there, I also discovered, as
someone on the list had suggested, one of the adjusting nuts had frozen to the
jet bearing.  So, with the carbs installed and both adjusting nuts turning
freely, I adjusted the mixture until the engine sped up slightly and then
settled to normal when the piston was lifted.  I went out for a test drive,
hoping to have solved the problem I was having in the first place, which was
rough running under load.  No dice.

The engine fires immediately and revs very smoothly, but, under acceleration
runs very roughly.  The problem's more pronounced above 2,800 - 3,000 rpm.
The fuel pump's new, there's a new filter between the tank and the pump, the
fuel lines are new, and the screens in the carburetors are clean.  I did have
the tank cleaned up and "sloshed" with sealant early on in the restoration
(before I found out this was a bad idea).  Could the "sloshing" have gummed up
the fuel pickup in the tank?  Would this cause the problem I'm describing?

By the way, all ignition components are new and the valves are adjusted
properly.

Thanks,

Mick Vander Ploeg
'57 BN4





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