Quote:
Originally Posted by TitaniumTT
The price is something that also causes me "concern." Breaking a set of $280 seals is, not ok but not tragic. If I lost a set of $1800 seals.... I would kill. Actually Kill.
From what I understand,
NRS lowered thier price to about $1,200 for a set of seals and springs
Ceramics give much better compression than steels before being broken in, but I haven't heard anything of what the comp is like after bedding the engine in. Actually, I got very similar results to the ceramics with the last engine I built - ~130psi.
When they do break, the just disintegrate leaving the housing in-tact.
I dunno, maybe I'll try them eventually, but not with this engine. I'm not looking for ridiculous amounts of power from a teeny tiny turbo cranked to 30psi and overheating the shit out of everything.
Meh, I'll talk to Dave when I'm there next.
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Depending on the seals construction will dictate the disintigration characteristics. The brittle-ness of the seal itself will only come into question when the elastic deformation stress is exceeded. Here's an example of a probably ceramic make up and stress strain curve
http://www.azom.com/Details.asp?ArticleID=3016
As you notice the elogation percentage is extremely low when dealing with the elastic deformation portion of the curve. These of course are in the tensile strength directions and for our purposes we would need to see the compressive strength readings and deformations. This however would appear to be valuable data as ceramics usually have much higher numbers when comparing their compressive strength (stress/strain) and their tensile strength (Much on the orders of magnitude).