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oldcorollas
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Kita-Ku, Sapporo, Japan
Registered:
January 2003

Re: Mod hlep for a new 4th gen' guy?

Wed, 21 April 2004 04:21

FWDboy wrote on Wed, 21 April 2004 14:03

I thought piston speeds were very similar amongst all sorts of engines (in regards to the S2000 engine vs F1 engine)?

yes and no...

with standard designs, materials and production techniques, from memory piston speeds are around 20m/s (4000 ft/min in old talk)

with better materials, higher quality production techniques, more attention to design, and lighter rods and pistons up to about 23-24m/s has been achieved
in 1993, hondas F1 piston speed was about 23.3m/s (REF: Automotive Engineering, sept, 1993)

weight and material strength is the critical factor for piston speed, and the 'piston speed limit' is basically due to the materials limits... if you use maybe, Al or Ti rods, you get higher strength and lower weight, so piston speed will be able to go higher.

if you run at higher rpm, which has substantially higher loads (the square of the increase in speed... ie 2x speed = 4x loads) then you are more likely to fail by fatigue anyways Wink

..

Cya,Stewart

ps.

Quote:

High compression forged aircraft aluminium pistons

i know what you are trying to say (ie high quality) but aircraft are comprised of many different alloy compositions... what you want is a high strength forging alloy for forged pistons.. nothing particularly to do with aircraft Wink

then again, forged pistons are usually heavier than cast pistons, but they are usually less brittle, and mroe resistant to death by detonation...

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