Carbon Buildup on only 1 bank?

[Thompy_04]

Kinda a frankenmotor here, but a hybrid of a 79 and 82 v6 flatback crossflow. Story. #1 cylinder broke a ring using parts that interchange on a rebuild. I noticed while breaking down the bad motor that #1,3,6 pistons and exhaust housing/cover had far more carbon buildup than the other bank. Any certain cause? I don't want this motor following suit. Thanks!

 

[Bosunsmate]

Re: Carbon Buildup on only 1 bank?

Did you check the thermostats, poppet valves,\?
If stuck open they may cause oil fouling of pistons from cold running

 

[boobie]

Re: Carbon Buildup on only 1 bank?

Was it cyl #'s 1,3,5 or as you said 1,3,6 ??

 

[Thompy_04]

Re: Carbon Buildup on only 1 bank?

My fault guys, it's 2,4,6 or if your looking at the heads the right bank looked pretty bad. Even the pistons were noticeably worse. Just curious what could cause this.

 

[boobie]

Re: Carbon Buildup on only 1 bank?

Cylinders 1,3,5 are on the starboard side of the mtr. If they were the ones carboned up real bad that was a problem with this mtr. If you didn't decarb the mtr regularly they would do that and cause piston failure.

 

[Thompy_04]

Re: Carbon Buildup on only 1 bank?

I really didn't decarb it and everything other than the carbon buildup was spotless. In addition thats exactly what happened it broke a ring. I'll keep the rebuild motor decarbed regularly. Thanks a ton