Quote:
Originally Posted by rveldman1
I am trying to find out why my plugs foul in less than 8 hrs of running. Identical Black sooty fouling on all 4 cyl .
Vacuum at idle is 18-20, and goes to zero at 3/4 throttle. Cyl compression is 90, 95 , 95, 90. Exhaust is blue-gray on start, clean at 165 degrees, timing is at tdoc. I run the slightly hotter plugs and engine starts incredibly well.
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The black sooty fouling on all 4, the blue-gray smoke, and the easy starting are all indicative of a too-rich mixture. When the mix is properly tuned, an updraft carb like ours should require full choke and be a little hard to start. I have confirmed this with a fuel:air ratio gauge. Mine is mixed to to the proper 14.7:1 and it always takes full choke and three tries to start when cold.
As for the waterlift, its just a noise issue. The A4 can be surprisingly loud without a muffler. But it will run fine. You'll just quickly tire of it!
With my waterlift, the engine is so quiet that the blower makes more noise than the engine at idle!