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Old 12-22-2011, 09:19 PM
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cast vs moly piston rings

Am going to hone my engine with the brush style hone with all the little balls.
my question is whats best moly or cast rings. am not sure of the grit of the hone because i havent bought it. the engine 350 gm. thanks

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Old 12-22-2011, 09:29 PM
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In the old days cast rings were used on used/worn/tapered bores due to the fact they would seal good on rough honed bores. Someone could cut the ridge out of the top of the bore and then ball hone the bore, install cast rings and have a cheap rebuilt engine. The rings will wear faster than Moly. Moly rings need at least a 400 grit or better hone job or moly may scuff off the ring face and end up with problems. If your bores are not in the best of shape and are ball honed I would recommend running cast rings.
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Old 12-22-2011, 11:20 PM
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well the bores are were just bored and machined but when i stored the engine(outside). Some how the bag fell off that protected the engine and a little water got in the cylinders. i took the heads off and there is very very minor rust in 2 cylinders.

now i just need to remove that rust and just to make sure i dont get any problems later am going to swap out all the piston rings.

Yea it sucks but i dont have a garage or nothing.
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Old 12-23-2011, 12:13 AM
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oh yea i forgot to ask can you hone a block with the crankshaft still installed???

I will make sure to put plenty of rags on the crank. then clean each cylinder for any residue. Then last use my barel type vacum to suck up any shaving.

Is this fine??
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Old 12-23-2011, 03:11 AM
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It would be nice if it was that easy.
You're gonna have to remove the Crank and scrub those cylinders thoroughly after Honing. Hot soapy water & toilet brush etc.....
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