JoelOl75

You motor rebuilders out there, I need your help!

Whats the right stones for honing. Is 320's to course? Or should I use 400's?

I know moly rings need a finer stone, but with all the different stone sizes I don't know what the right one is.

Also, do you use any type of lubricant (oil or ATF) while honing? All the books I see just tell you about the crosshatch but don't really go in-depth about grits and tricks & stuff...

Thanks.

82camaro

Unless this is on your lawnmower engine, I would take it to a machine shop. You will never get the proper crosshatch, especially if this is your first time. I know a handful of people that can hone good, but they have years and years of experience and in most all cases they have a machine shop do it.

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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro

JoelOl75

I've found myself a 10/20 4 bolt main motor that was redone .030" over, driven about 2,000 miles and pulled, oil pan and heads off and thrown on the floor of the guys garage. The cylinders mic out at 4.027 everywhere down the bore and there's no ridge... I could still see the crosshatch....

The problem is all kinds of dirt, sand, leaves, ect. was all up inside there so after flipping the block upside down and brake parts cleaner to try to rinse it out, lubing it back up well with some oil, I popped the pistons/rods out for a good cleaning/re-ring. I have the hone and 320 and 400 grit stones and borrowed a deck plate so I'm going to do this, but some insight would help...

I'm figuring on skipping the 320 and going right for the 400's....

Everyone who could do this must of had a 'first time'

Main thing I need to know is what lube do you use while honing? 30 weight OK or ATF? or is there something better? Any help greatly appc'd!

82camaro

When I do mower/small tractor engines, I use HD30. But I've heard of people that use ATF. You'll get done faster with ATF because it's thinner and has less 'lube' in it.


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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro

RB83L69

The grit depends on the rings you're using. For cast-iron or chrome, use a coarser stone; for moly, the fine grit. I prefer ATF as the lube, it provides the necessary fluid without gumming up.

If it's at 4.027", I'd suggest using the 320 or even a 220 first, especially if the pistons are forged. IMHO that's too tight for a performance bore fit.

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"So many Mustangs, so little time..."
ICON Motorsports

JoelOl75

Thanks for the info, ATF it is. I found it quite odd to have the bore that tight and I had my mic checked at work and even borrowed my friends and it checked the same.

I have no idea who did the bore job, but I guess under is better than over!