Low tension ring?

[88bluestar]

Have an engine apart that had a fuel wash issue that really did a job on the bearings, and since I have it torn down the cylinder do have some glazing and really considering a good quick hone and new rings. What hone grit would be used for breaking up the glaze and best for these 1.5/1.5/3.0 low tension rings?

[88bluestar]

Have to add, what ring material is best for this situation with a quick hone etc?
I believe the current ones are plasma moly.

[BillK]

If you are going to hone it in a machine i would do whatever you normally do for a finish. I would do 5 or 6 strokes with 280 grit then a couple of strokes with the plateau brush.

If you are talking about a ball hone, the ones I use are 320 grit. I use them with Sunnen honing oil.

[mag2555]

For the best longevity besides the top and bottom ring being PM faced you want them ductile iron also.

Also seeing where the scratches end in your bores you really want to take the time to roll over the Corner’s of the oil rail rings besides the compression rings.

Those type of edges add a bunch or friction to a motor besides grit!

[Tom68]

Glazing ?
That's wear isn't it ?

[Geoff2]

Glazing.

From ACL, Tasmania, manufacturer of pistons, brgs & rings:
'G is best described as the effect seen on a bore when rings have not bedded in properly. The appearance is of a shiny, but somewhat discoloured [ brownish ] appearance.....G is really a chemical build up of combustion products, iron oxide & graphite [ from the rings & bores ] . It is in fact a very thin skin applied over the honed finish. G is usually caused by lack of proper running in & prolonged idling or insufficient hard work during the running in period can be the cause. Once a bore is glazed it is very hard to unglaze....

[steve cowan]

Low tension rings only really work in a so called round bore,
If the bore is not in good shape the Napier 2nd ring will struggle and you will have blow by issues for sure.
Apart from glazed bore you might have dirt issues looking at the bore marks,air filter,or rusting headers on the inside getting pulled back into the chamber from the exhaust side.
Do you use some form of crankcase vacuum with the low tension rings??

[RDY4WAR]

I use a 240 grit and finish with a 400 grit.

[88bluestar]

Engine came with the car when I bought it, not of my doing. I tore it down to inspect, and oh boy I'm glad I did!
New main, rod, and cam bearings on the way. Total seal CRG low tension rings ordered as well.

[Tom68]

Have to add, what ring material is best for this situation with a quick hone etc?
I believe the current ones are plasma moly.

Have you measured the bores ?
You have ovality and taper and moisture damage, check with the ring manufacturer on how much their rings can handle.

[88bluestar]

Have to add, what ring material is best for this situation with a quick hone etc?
I believe the current ones are plasma moly.

Have you measured the bores ?
You have ovality and taper and moisture damage, check with the ring manufacturer on how much their rings can handle.

4.040 and measured top to bottom and side to side, albeit with rudimentary inexpensive bore gauge tools and a micrometer.
The CRG total seal rings are 4.045 1.5/1.5/3mm 11 lbs low tension.

https://www.summitracing.com/parts/tsr-crg2010-45

[88bluestar]

Low tension rings only really work in a so called round bore,
If the bore is not in good shape the Napier 2nd ring will struggle and you will have blow by issues for sure.
Apart from glazed bore you might have dirt issues looking at the bore marks,air filter,or rusting headers on the inside getting pulled back into the chamber from the exhaust side.
Do you use some form of crankcase vacuum with the low tension rings??

Only a Kevko breather installed on the fire wall with a long attached hose via the left side valve cover. No
vacuum pump.

[steve cowan]

Not sure if you have to run exhaust muffler,a evac on the Exhaust collector would help.

[88bluestar]

Headers, open race muffler(slight noise reduction) at the end of a long extension. 3” pipe.

[Walter R. Malik]

Have an engine apart that had a fuel wash issue that really did a job on the bearings, and since I have it torn down the cylinder do have some glazing and really considering a good quick hone and new rings. What hone grit would be used for breaking up the glaze and best for these 1.5/1.5/3.0 low tension rings?

I would simply use a "glaze breaker" BRM plateau brush for that.