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Unread 02-16-2012   #1 (permalink)
ryan7662 is offline PONY Member


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Default Plasma-moly rings fine with a 280 grit hone?

I've read all over the internet that you need a 400 grit hone with plasma-moly rings. The machinist that's re-boring my 95's 302 says that a 280 grit finish is best for them. He's pretty adamant about that and said he could do a 400 grit finish but it'd be more expensive and is really not necessary at all. I've had work done in the past on a 351w at a different machine shop and they said the same thing.

Now I already have one of these 400 grit flex-hones from a past 351w build http://rover.ebay.com/ar/1/711-53200...5&toolid=10001 eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices. Should I chuck my flex hone up in a drill and pass it through the clyinders after I get the block back? Would I be doing more harm than good if I do? Thanks for any help on this
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Unread 02-16-2012   #2 (permalink)
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that 280 will eat the moly up! 400-600 for plasma-moly. if you have the 400 you can do it yourself when you get it back.
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Unread 02-16-2012   #3 (permalink)
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Quote:
Originally Posted by cindys_sn95 View Post
that 280 will eat the moly up! 400-600 for plasma-moly. if you have the 400 you can do it yourself when you get it back.
10-4 good buddy I'll definetely pass my 400 grit flex hone through it then. I know you do this for a living too cindys_sn95 I just can't figure out why the machine shops I've been to locally keep telling me to go with a 280?

About how long do you think I should pass the hone through it when I get it back? Last time with the 351w I did 3 passes in each bore and kept the hone in for about 20-30 seconds each time. I looked up this video on youtube and did my best to copy the motion demonstrated in it. I'm using a black and decker drill that has a max of 1500rpm and I keep the trigger a little above half throttle. Video says not to exceed 1200rpm so I figured I was doing it right.

One thing I did do wrong though it didn't seem to hurt was I started the hone spinning inside the bore instead of before inserting it but I did keep it spinning as I took it out though. I think since the hone was a tight fit I was afraid to go in too fast(giggity) but now that I watch that video again I think I should have. Is it really important to have the hone spinning before inserting it into the bore? Thanks again cindys_sn95 your a tremendous help as always
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Unread 02-17-2012   #4 (permalink)
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the spinning before is not that important. and everything else you mentioned about time and strokes is correct, and keep it well oiled. and thanks for the kudos, but i really don't do anything for a living these days. semi-retarded as the wife says. i just do enough engines these days to pay for my own addiction! i have just done this for a long time, and screwed a LOT of stuff up along the way. just learned a few thing from my mistakes.
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Unread 02-17-2012   #5 (permalink)
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Mark is right and 280 is a bit rough still.

The thing with going to fast is that it creates to much heat so that is why you do it at a lower speed and move it throw the entire bore. Remember all you are doing is honing which improves the shape, geometric form and surface texture that is already cut.
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