Correct ball-hone grit to use on factory rings? - Turbo Dodge Forums : Turbo Dodge Forum for Turbo Mopars, Shelbys, Dodge Daytona, Dodge SRT-4, Chrysler PT Cruiser, Omni and more!

Engine - Turbo & Block Modifications and upgrades to maximize your Dodges turbo output & Improving strength and durability - pistons to crank.

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post #1 of 13 Old 03-19-2017, 05:37 PM Thread Starter
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Correct ball-hone grit to use on factory rings?

I am going to buy a ball hone to break the glaze on the bores of the T2 engine I am rebuilding. Apparently different ring compositions require you to use a different grit hone for best results. I plan on using a set of factory standard size rings. Does anyone have any in-the-field, or professional advice on which grit hone is best to use for a set of factory turbo rings and do you know what type rings they are? Moly, iron, etc?

The Mopar Part # for the factory ring is: 4411977
Of course there is no spec easily found for these specific rings.

Thanks guys/gals. I did find these suggested grits to use on the Flexhone Web site...

As far as the grit of the ball hone, the flex hone site is stating

Iron Cylinder Ring Type:

OEM Iron rings: 180 or 240 grit

Chrome rings: 240 or 320 grit

Moly Rings: 320 or 400 grit

Plasma Rings: 320 or 400 grit

not sure ring type: 240 grit



Manufacturers Recommendation:

Hastings: 240 grit

Harley Davidson(stock): 320 grit

Total Seal: 400 grit Wiseco (chrome top): 280 grit

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post #2 of 13 Old 03-19-2017, 06:39 PM
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Re: Correct ball-hone grit to use on factory rings?

i used perfect circle moly rings in my last build, same as you are doing- just a re-ring with std sized pistons. perfect circle recommended 320 grit finish for the rings. used a 320 grit ball hone and my rings seated perfectly.
just use whatever the ring manufacturer recommends and you'll be fine.

edit- the stock rings are moly btw.
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post #3 of 13 Old 03-19-2017, 06:56 PM Thread Starter
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Re: Correct ball-hone grit to use on factory rings?

For example: Sealed Power Rings...Park number E453K available at Rockauto

Sealed PowerŪ parts provide innovative designs, use leading-edge materials and utilize ISO & QS certified manufacturing in order to deliver top quality products that meet the rigorous demands of today's modern engines.

Face of top rings coated with latest generation plasma-moly
Decreases friction
Resistant to scuffing
Exacting tolerances
Meets or exceeds OEM specifications

So...according to the Flexhone suggested grit table the best grit hone for the Sealed power would be:

Moly Rings: 320 or 400 grit
Plasma Rings: 320 or 400 grit
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post #4 of 13 Old 03-19-2017, 07:27 PM
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Re: Correct ball-hone grit to use on factory rings?

i was wrong, just looked at the box, it was the 3 1/2" sc400 hone, 400 grit.
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post #5 of 13 Old 03-19-2017, 07:27 PM Thread Starter
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Re: Correct ball-hone grit to use on factory rings?

"edit- the stock rings are moly btw."

I only ask because the material determines if I get a 240 or a 320 grit hone and choosing the wrong hone will for sure not lead to a long life with a good ring seal.

How sure are we of this statement?
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post #6 of 13 Old 03-19-2017, 07:30 PM
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Re: Correct ball-hone grit to use on factory rings?

Quote:
Originally Posted by ILIKESHELBYS View Post
"edit- the stock rings are moly btw."

I only ask because the material determines if I get a 240 or a 320 grit hone and choosing the wrong hone will for sure not lead to a long life with a good ring seal.

How sure are we of this statement?
100% sure. all the turbo cars got moly rings.
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post #7 of 13 Old 03-19-2017, 07:53 PM Thread Starter
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Re: Correct ball-hone grit to use on factory rings?

Most the comments I have gathered thus far seem to feel they are Moly coated and that a 320 grit would be the best choice for a flex-hone
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post #8 of 13 Old 03-20-2017, 03:50 PM
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Re: Correct ball-hone grit to use on factory rings?

Steve,
When I'm going to re-ring only (like after breaking a piston) I've used the 320 grit ball several times with good results. This would be for using moly coated iron ring. If using stock cast Mahle pistons, I would run top ring gap larger than FSM specs. unless your running stock boost levels.
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post #9 of 13 Old 03-20-2017, 08:45 PM Thread Starter
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Re: Correct ball-hone grit to use on factory rings?

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Originally Posted by 4 L-bodies View Post
Steve,
When I'm going to re-ring only (like after breaking a piston) I've used the 320 grit ball several times with good results. This would be for using moly coated iron ring. If using stock cast Mahle pistons, I would run top ring gap larger than FSM specs. unless your running stock boost levels.
Ahhh this is good advice! Thanks for bringing this to my attention about the upper ring gap.
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post #10 of 13 Old 03-25-2017, 02:45 AM
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Should be moly. 320 should be good. I use a 3 legged hone with removable stones and finish with the finest grit stones. I've heard horror stories about moly rings not seating. I honestly think it's because people hone with too coarse of grit. Moly rings don't wear a cylinder wall like plain cast iron so a coarse finish won't smooth out enough to seal.
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post #11 of 13 Old 04-17-2017, 03:06 PM Thread Starter
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Re: Correct ball-hone grit to use on factory rings?

I went with a Flex Hone cylinder honing brush, 95 mm, 3-3/4" bore. 320 grit aluminum oxide tool to hone the cylinders in this engine rebuild. This tool is made by Brush Research and is their part #GB334320AO

It worked great, took about 15 minutes to do all 4 cylinders. About 35 up/down passes with my Milwaukee rechargeable did a great job, went with Hastings moly rings (HASTINGS 2M4206 4-CYLINDER PISTON RING SET) ...like what came from the factory, ring end gaps checked, everything went fine. Great looking cross hatch after the honing was complete.

Flex-hone tool performed super, I didn't have any problems with any balls coming off as reported by a few others elsewhere. After doing four cylinders the tool still looked like new. Used WD40 as my lube after rubbing the cylinders with some machine tool cutting oil. Lots of soap and water and a through brushing to remove the grit, then a power wash with an industrial steamer to finish the clean up.

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post #12 of 13 Old 04-19-2017, 03:11 PM
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Re: Correct ball-hone grit to use on factory rings?

The last one I honed myself, I did a quick honing with the flat tripod style honing tool. I believe the stones were equivalent to 400 grit (memory is fuzzy, it's been a while). If all you're doing is breaking the glaze for stock rings, 3-400 should do it. The rings seated great on that engine. Stock 2.5, Sealed Power stock turbo rings, had a solid 150 psi across the board and no smoking. The bores started slightly worn but with visible signs of the original factory cross-hatch. If yours are extra worn, you may want to run a rougher grit down the bore a couple times first (like 200), then finish with the 400.

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post #13 of 13 Old 04-19-2017, 08:40 PM Thread Starter
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Re: Correct ball-hone grit to use on factory rings?

Quote:
Originally Posted by EvilcowRoland View Post
The last one I honed myself, I did a quick honing with the flat tripod style honing tool. I believe the stones were equivalent to 400 grit (memory is fuzzy, it's been a while). If all you're doing is breaking the glaze for stock rings, 3-400 should do it. The rings seated great on that engine. Stock 2.5, Sealed Power stock turbo rings, had a solid 150 psi across the board and no smoking. The bores started slightly worn but with visible signs of the original factory cross-hatch. If yours are extra worn, you may want to run a rougher grit down the bore a couple times first (like 200), then finish with the 400.
The bores came out really sweet. I'll snap and post a pic when I get a chance.
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