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Twins are more fun!
Join Date: Dec 2005
Posts: 639
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Impressions on JE pistons?
What are people's thoughts on aftermarket JE forged pistons?
I might slip in some 97mm JE's, or bore out my 97mm 930 cylinders to 98 and get some 98mm JE's. I'm aiming for 8.0:1 C/R. Thoughts / advice?
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James Carrera TT (3.3, Protomotive MAP ECU, EFI, GT2 EVO CAMs, Twin Plugged, Twin Turbo's) |
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11-07-2008, 07:00 PM
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Max Sluiter
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JE forged Aluminum alloy pistons expand at a greater rate than the Mahle cast Aluminum pistons and cylinders. The JE alloy is strong, but has less Silicon (partly because it is easier to forge) and so expands more at operating temperature. They build them to be in spec at operating temperature so when cold, your engine will be noisy due to "piston slap" - excessive clearance between the piston and cylinder bore.
"Nickies" from LN engineering are billet Aluminum, CNC machined, Nickel-Silicon Carbide coated cylinders that are stronger, more precisely shaped, and have better cooling than OEM cast Mahle cylinders. The alloy "Nickies" are made from is matched to the expansion rate of JE pistons. They are designed to work together and expand at the same rate through to operating temperature. The tolerances are tight and there is no noise.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance Last edited by Flieger; 11-07-2008 at 07:09 PM.. |
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11-07-2008, 07:06 PM
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1971 Porsche 911S
