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 9 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 9 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 9 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 9 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 9 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 9 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 9 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 9 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 9 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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