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Has anyone tried Atkins new 'countersunk' cornerseals? I'm trying to find feedback about them e.g has anyone noticed any pros cons, or any difference at all? Any accelerated wear?



In theory they should be better due to the reduced surface area.

BDC

Ayep I've used several sets. No real particular feedback data, however, since they're new. They seem like they'll work alright to me.



B

Maxt

Less sealing area, motor sealing is paramount, I dont see any benefit over stock to be honest..

j9fd3s

lol, i just looked at the website. the stock corner seal they list, n326-11-c20, they sell for 7.70 WITHOUT the rubber plug.



you buy it from the dealership its 7.95 WITH the plug.



so that means they buy the corner seal, pull the plug out, and then sell em both seperate.... thats $20 a motor extra.... tacky

Maxt

That is pretty cheesey...

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Ordered 2 sets so I guess I'm going to find out

Lynn E. Hanover

Oh my. Grasshopper, the whole world is a unit pressure problem. If your spring pressure is limited by

common sense (too much drag) and sealing is still a problem, then reducing the area of surface contact

increases sealing, by increasing unit pressure and the oil film is subverted and sealing is accomplished.



So, sealing is improved without increasing spring pressure. Of course drag is increased somewhat, as well, but if sealing loss was costing more HP than the increased drag looses, then its a net improvement. And this may make lower spring pressure possible, so as to make more HP than before.



Lower area will increase wear rates barring any other changes, like heat treating to improve wear or some sort of coatings.



Suppose you wanted to drive a metal stake into the ground to anchor a big tent. The stake it turns out was once a snap ring Chevy axle, (and all of those should be used as tent pegs) with one square inch of surface area on its end.



So hitting the flange end with a 10 pound hammer, will produce more than 10 pound of pressure on the flat

(snap ring) end when struck. So let us say you are 10 years old and can barely lift the hammer high enough to hit the axle, and the best you can do is generate 100 pounds of force when striking the axle.



So at the flat end with one square inch of area we will see 100 pounds per square inch of force. This is not enough force to penetrate the sod. So what to do?



Sharpen the flat end of the axle to a fine point. We look at our modified axle and determine that the surface area of the point is now one millionth of a square inch. So we hit the axle again with 100 pounds of force and at the point we will see what????



100 million pounds per square inch. Will that go through the sod? That will go through damn near anything.



Unit pressure. The answere to most problems.



Why are side seals so narrow?



Why were 9MM apex seals abandon in favor of 3MM then 2MM apex seals?



Unit pressure.



In piston engines why are racing piston rings so thin? They get the same sealing with far less spring pressure, and produce far less drag (lost HP). Same unit pressure with far less spring pressure.



Why do buildings have footers? (a wide concrete base under all of the load bearing walls) Unit pressure.



An 8" wide wall will sink into the soil when the building gets heavy enough. So you pour a 24 inch wide footer to set the walls on as you build and that cuts the unit pressure by a factor of more than three.



So now there is little or no sinking.



Why do knives have sharp edges?



Why are nailes pointed?



Mr. Wizard (Don Hurbert) died a few weeks ago, and it has been left to me to fill in for him.



Lynn E. Hanover

racerguy180

Rock on Lynn!



A woman wearing stiletto heels produces more pressure in just her heel than a elephant does on all four feet!

Maxt

Thats only half the story...

It was 6mm seals that were abandoned for 3, and 3 mm abandoned for 2. And spring pressure is a minor player once the engine is running.

People all started jumping on the solid corner bandwagon supposedly because they break under high boost. Then a wise man in Japan told me that if you know how to measure a rotor and apex seal properly, you can then pick the cream from the junk and you will never break a corner seal again, thus if you use quality parts there is no need for magic aftermarket parts whose quality and sealing characteristics, is inferior to the stock mazda.

Maxt

My battery ran out I wasnt done. Yes underseal pressure is important, so why introduce more volume for gas to fill, it goes back to why we went 6, 3, 2 mm in terms of apex seal.

Anyway, the corner seal has never been an issue of sealing to the iron , there is no purpose to less face area and pressure in that area since sealing there has never been an issue and the more pressure is probably not true anyway , unless you think time is not a factor in pressure rise after adding an additional volume to fill. The corner seals main seal concern asper Jsae, is the end gas of the apex seal, and sealing there is far more important that anywhere else.. The next biggest mistake is leaving the corner seal rubbers out entirely..

Its a nice gimmick, and just another patch for not paying attention to whats important in the first place, in spec parts.