Lostcause521 Posted March 10, 2014 Report Share Posted March 10, 2014 I pulled my l20b head to have a little looksie and I curious if anyone would call this exessive carbon buildup. The tops of the pistons look about the same. <a href='http://i.imgur.com/dM2OgmN' title=''><img src='http://i.imgur.com/dM2OgmN.jpg' alt='' title='Hosted by imgur.com' /></a> I bought this engine clean as a wistle, freshly painted, but a few things didn't add up, like missing exhaust manifold bolts and a beat up oil pan. I don't know if I should go any farther freshening it or just bolt it back together. The bores look smooth, with only a little bit if a ridge at the top of cyl 1. Quote Link to comment
ggzilla Posted March 10, 2014 Report Share Posted March 10, 2014 Do a compression test to be sure. The look like overly rich. Not caused by the engine but by the carburetor. Maybe some,body fitted a Weber and never adjusted it. 1 Quote Link to comment
datzenmike Posted March 11, 2014 Report Share Posted March 11, 2014 Short trips to town and choke on more than off in this weather will look like that. Get a dull knife and scrape it off the exhaust valves. If a light cream color under that's all it is. Quote Link to comment
smoke Posted March 11, 2014 Report Share Posted March 11, 2014 For future reference, You can clean off a lot of carbon from inside a running engine by feeding a LITTLE water in it. 2 Quote Link to comment
MikeRL411 Posted March 11, 2014 Report Share Posted March 11, 2014 The bores should show some of the cross hatching. "Smooth" is not smooth in a cylinder bore. Quote Link to comment
MicroMachinery Posted March 11, 2014 Report Share Posted March 11, 2014 Seafoam cleanse :devil: Quote Link to comment
datzenmike Posted March 11, 2014 Report Share Posted March 11, 2014 For future reference, You can clean off a lot of carbon from inside a running engine by feeding a LITTLE water in it. Yup. Get the motor HOT even put cardboard over the rad. If you have a header open it. Rev the motor and begin pouring a pop can of water into the open carb, slowly at first. The motor will slow down from the cooling effect so rev it more and continue pouring. The sudden cooling and the steam generated will flake the carbon off. Let the motor recover it's heat by idling. When hot do again. The combustion chambers will steam clean just like a blown head gasket. Quote Link to comment
smoke Posted March 11, 2014 Report Share Posted March 11, 2014 My grandmother's car used to get so much carbon build, from driving 3 miles a day at 12mph, that it would start to rattle. Give it the water and flog it, it would clear right up. Quote Link to comment
Rick Rodchester Posted March 12, 2014 Report Share Posted March 12, 2014 Water is a new one for me. But I did try the Seafoam, reluctantly, That stuff really cleared up a lot of problems... Quote Link to comment
smoke Posted March 12, 2014 Report Share Posted March 12, 2014 50% pale oil + 30% Naptha + 10% isopropyl alcohol + 10% water = seafoam. In case anyone was wondering. Quote Link to comment
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