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Old 02-05-2005, 06:54 AM
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break in period

I built a pontiac 355 engine and I just put 2 thousand miles on the engine. I checked the sparkplugs and some have oil on the tip and some have carbon buildup. Some one told me that the piston rings have to set. Is this correct. I staggerd the rings. How many miles do I have to put on it until the engine is ready to be tested? You think thats why I have a hard time starting up the engine?

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Old 02-05-2005, 07:11 AM
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If the rings haven`t seated by 2000 miles there not going to.
Are you using synthetic oil? if so this is why, mineral oil is needed for the break in. if your not using synthetic oil, then I would find out why the car is using oil, did you have the heads reworked and the guides checked? Also be aware if your using a PCV valve with a valve cover breather and not the stock configuration, the pcv can pull oil in if the breather doesn`t restrict it enough, this can also happen with the stock configuration if there`s no filter in use.
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Old 02-07-2005, 01:06 AM
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I dont know if this helps or not, but could it be that maybe your cylinders arent square? I know that when i had my 350sbc bored out .030, the mechinest used a torque plate on the block, before he bored the block, and as he begins to bore you can here the blades hit more around the bolt holes. Witch means i guess if the torque plates worent used to bore the block, after the heads got torqued it would tend to pull the cylinder out of round, and not allow the rings to seal.

I dont know if this helps or not, but could it be that maybe your cylinders arent square? I know that when i had my 350sbc bored out .030, the mechinest used a torque plate on the block, before he bored the block, and as he begins to bore you can here the blades hit more around the bolt holes. Witch means i guess if the torque plates worent used to bore the block, after the heads got torqued it would tend to pull the cylinder out of round, and not allow <a style='text-decoration: none; border-bottom: 3px double;' href="the%20rings" onmouseover="window.status='the rings'; return true;" onmouseout="window.status=''; return true;">the rings</a> to seal.
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Old 02-07-2005, 02:53 AM
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Quote:
Originally posted by bowtieorbust
I dont know if this helps or not, but could it be that maybe your cylinders arent square? I know that when i had my 350sbc bored out .030, the mechinest used a torque plate on the block, before he bored the block, and as he begins to bore you can here the blades hit more around the bolt holes. Witch means i guess if the torque plates worent used to bore the block, after the heads got torqued it would tend to pull the cylinder out of round, and not allow the rings to seal.

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Old 02-07-2005, 05:59 AM
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He is just saying that when the heads are torqued it pulls the cylinders out of round a little bit. Torque plate honing will help solve this problem by simulating the distortion while the cylinders are finish honed. As for the boring, I am not sure that the torque plates are needed for that. I believe it is just on the hone.

Chris
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Old 02-07-2005, 11:00 AM
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engine break in

a stock engine should be broken in a matter of 20 to 50 miles. after initial checks that it is timed correctly has Good oil pressure watter level correct take it to the freeway , ma ke 2 or 3 full throttle runs to 60 mph decell make sure of no over heat .. i visited cats engine test aria some time ago the new engines are filled with hot oil and watter run for 2or 3 min then run under full load for 15 min. ready to go towork.my theory's worked well for me on Manny gas engine rebuilds as well as diesel
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Old 02-07-2005, 11:24 AM
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Do you know what kinda of rings were used chrome moly, moly, iron... if you dont get the block honed properly the rings wont seat and will use oil like a mutha. Does it smoke?
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