Torque BS Filter ``

[DICK BREWSTER]

Stuart, a very good smell test to use on torque claims for 
naturally aspirated four stroke gas engines the 1 to 1.1 ft-lb 
per cubic inch test.

Very few streetable engines get much over 1 ft-lb per cubic inch 
torque.  Some of the better engines get up to about 1.1, but 
that's about it for an accurate dyno test under real conditions.

The reason is it's hard to get much over 100% volumetric 
efficiency and the effective compression ratio is pretty much 
limited by pump gas.

Dick




>I believe people have got over that from stroked V12 jaguar 
>engines, supercharged.
>around 500lb-ft without the supercharging. running around 8.5l 
>of capacity, and on avgas.
>however, these have a VERY good head design (for the time), 
>which allows this, a
>standard jag. XJ12 is 12.5:1 compression on 5.3l, but they have 
>a VERY advanced
>distributor (and later computer controled ignition) to control 
>detonation problems.

>not exactly a bus but...
 >------------------------------------
>Stuart Woolford, stuartw at kcbbs.gen.nz