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Lean plug

Moderators: Curt!, Pa

Post Fri Apr 20, 2007 5:03 pm

Posts: 118
Location: cornwall, ontario,canada
O.K. guys!!!! I have a 48 Chief (Bonneville). The plug in the front head is recessed in more than the rear plug (sits much deeper in the head). Is this the way they were designed? The front plug is much leaner than the rear plug. There are no leaks at the head or intake manifold. When I removed the head, there was significant carbon build-up in the combustion chamber. If I enrichen it any more the pipes get real sooty and the engine begins to load up. Any ideas????

Post Fri Apr 20, 2007 6:49 pm

Posts: 3118
Location: Central Illinois, USA
Sparky!

How did you make certain that "there are no leaks at the head or intake manifold"??

Just asking.

....Cotten

Post Thu Apr 26, 2007 1:23 pm

Posts: 118
Location: cornwall, ontario,canada
Cotten, I took the carb off and made a block on the manifold. I put air into the manifold at about 7 lbs. Some air did leak out but it took a while.

Post Thu Apr 26, 2007 5:47 pm

Posts: 3118
Location: Central Illinois, USA
Sparky!

Any bubbles at all are too many.

....Cotten


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