Quote:
Originally posted by mbtoloczko
... the high cylinder temps resulting from the very high pressures due to the 10:1 CR cause the edge of the piston to melt away...
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I got to thinking about this statement and it didn't make sense because aluminum, cast or forged, melts at the same temp, so I called Cobb Tuning back up. The deal is that its not so much an issue of melting is that a piston designed for boost should have a much larger space between the top of the piston and the first ring for strength and heat transfer away from that corner, and the SVX piston does not have a large space, so the corner is not well supported, and when it gets hot from the cylinder temps, its easily chipped or deformed.
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Mychailo
:: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ ::
1995 Laguna Blue SVX L AWD 5MT (sold)
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SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads.
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