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Engine Mechanical / Electrical / I'm back! With bigger problems.. BBF with 10 hours.. 3 of 8 pistons blue??
« on: October 11, 2011, 12:06:29 AM »
So here we go, just had my 429 built, had about 11 hours on the motor when I heard a little tick, took it to the shop ends up being a bad roller lifter that scored the cam a little.. Upon bottom end inspection, the builder calls me and says we've got bigger problems, 3 Out of the 8 pistons were literally blue and scored to shit right through the rings as well, and the rest were mildly scored.. The tops of the pistons were covered in carbon, just the sides looked they got hot, I've had the motor for about 60 days at this point and a total of 11 hours on it. The motor builder is trying to tell me that I ran it to lean that's why this happened. Keep in mind that I changed nothing on this motor just pulled it out with a broken crank, had it rebuilt, and put it back in. The pistons that were pulled out of this motor were near perfect after 8 years of solid abuse.any input on this would be very helpful!!
I just had my 429 CJ rebuilt from the ground up, I broke the crank last august, new pistons, rods, crank, (forged this time) bored etc.. Full roller motor, the guy said to break it in drive it, I said ok. Here are my issues 1st time I go out the starter fried, went and got one from the auto store put it on cranked the motor in reverse. Blew some flame out my carb. Pulled the carb checked the power valves etc everything was good or so I thought.. I go out again, it's sputtering.. I change the plugs change the oil runs perfect..5600 rpms, 84 gps, love it. I park it.2 days later I head to lake Oroville for fourth of July put my boat in the water, warm it can't get more than 5300-5400 rpms out of it.. I figure conditions elevation or whatever.. Then I'm haulin ass back in to camp about 5300 let off the gas it and all of a sudden it's running radical missing and blowing some black smoke shut it down and 2 foot flames come out of my basset headers for about 15 sec.. I get towed in tried starting it and I had to have my foot in it to keep it running still the same feeling like it's flooded to shit.. Next morning.. I start it. Runs like nothing ever happened. Still at 5300-5400. Now I've talked to a guy he seems to think I may have cracked a piston?? Oh and in the mean time my headers cracked on the number one cylinder, anybody with any similar stories or some input would be great! I have a built berkley with a bronze impeller I believe it's an A. My hull is a 79 sleek craft tunnel sst. Any help or input would be awesome!