>
> >> The more I think about a low conduction SS rotor the better
> it looks.
> >> I suspect
> >> a disproportionate amount of combustion heat is going into
> the rotor
> >> and thence into the oil raising the BSFC.
> > >
> > > Paul Lamar
> >
> > Make the new RX8 rotor also 7-8 CR, and we have a wonderful
> rotor for
> > turbo engine.
> > Cheers, Petri
> >
> > Good idea. We can sell them to the RX8 engine people with a lower
> > compression ratio for turbo charging. The current 10:1 RX8 rotors
> > are really unsuitable for turbo charging.
> > Paul Lamar
>
> Every RX8 tuner wants a pair of these. This could finance the whole
> project.
> Things to take care of first could be:
>
> High rotor face temp on WOT.
> Lower thermal conductivity translates to higher surface temp?
> We don't want this on high boost. Makes the knock situation
> worse on
> high power, also volumetric efficiency would suffer, offsetting
> our gain
> on IMEP somewhat. But how much - and should we care?
>
> On 75% cruise, this is likely to be just fine. Together with
> 250F/16psiglycol-water coolant, there could be clear gains on
> BSFC compared to
> baseline engine.
>
> But car tuners are mainly interested on how much peak power they could
> get, and that's the biggest market...
>
> Apex seal groove friction
> Boost stresses are higher due to 14-28 psi boost possible. Is SS
> up to
> task by itself?
> Cheers,
> Petri
>
> Once the patterns are made you could cast either in iron or SS.
> If there was enough meat you could machine the combustion chamber
> on an NC mill. Make heavier high CR SS for the RX8 car cruise
> market with
> a lower red line. Make lighter low CR iron for the turbo RX8 market.
>
> Paul Lamar

What would be the weight of a SS rotor?  Presently it is 9.2 pounds.

Marc J.
NexusMustang


http://hypertextbook.com/facts/2004/KarenSutherland.shtml

Metal      Steel, tool..........7.715
Metal     Wrought Iron.........7.75
Metal     Carbon Tool Steel....7.82
Metal     Steel, cold-drawn....7.83
Metal     Carbon Steel.........7.84
Metal     Steel, C1020, HR.....7.85
Metal     Pure Iron............7.86
Metal     Soft Steel (0.06% C).7.87
Metal     Stainless Steel, 304.8.03
Metal     Stainless 18Cr-8Ni...8.03