Popped through the intake.

[cyclops222]

How much leakage can really happen when the cylinder is firing 12 times a second ? At 600 times a second ?
I would run it as is.

 

[Pmt133]

So I just ran an hour sustained 3800... no issues. So I'm more confused than when I started.

 

[Lou C]

Old boats with carbed engines are just prone to these kinds of things, can't hook up a scanner and read live data!
I agree I would run it, if the missing comes back, do a cylinder balance test....
Is the carb a 4bbl? Weber or Edelbrock? In which case it is pretty easy to take off the air horn to see if there's anything floating around in there...

 

[Pmt133]

Old boats with carbed engines are just prone to these kinds of things, can't hook up a scanner and read live data!
I agree I would run it, if the missing comes back, do a cylinder balance test....
Is the carb a 4bbl? Weber or Edelbrock? In which case it is pretty easy to take off the air horn to see if there's anything floating around in there...

1 jet 2bbl mercarb. I have a 4bbl weber sitting on the bench to go in... once this is figured out for good.

 

[cyclops222]

You are aware that true Weber carbs used to require a LOAD of different liquid & air jet sizes to get them tuned correctly. It is a slow & tedious procedure. Unless things have changed.

Weber's make great paper weights.

 

[Pmt133]

You are aware that true Weber carbs used to require a LOAD of different liquid & air jet sizes to get them tuned correctly. It is a slow & tedious procedure. Unless things have changed.

Weber's make great paper weights.

Its a merc weber off the same engine set up to the factory specification. Having had them all, for this application I'll take the weber.

 

[Lou C]

I thought the Mer-Carb 2bbl was a modified Rochester 2GV (sure looks like one) whereas the Weber 4bbl is an update of the old Carter 4bbl used on many Chrysler products and the Edelbrock is very similar if not identical to that....
I have a Quadrajet on mine now that needs a cleaning and rebuild and I also have a Holley 4160 calibrated for this engine sitting on a shelf in the garage, and believe it or not I just bought an Edelbrock 1409 as well. So if one carb gets gummed up and can't be made to work right due to dang ethanol gas I have options.
BTW, here's an idea for those of us in draconian states that force you to use E10. When winterizing, how about filling the fuel/filter separator with straight gas like VP Racing, etc, and then run the engine on that to fog it? That way the E-10 isn't sitting in the carb all winter. The ethanol related deposits and the deterioration of rubber parts seems to be what causes most of the problems with carbs and E10. My fuel is always totally clear when I dump the filter though.