Torque BS Filter ``

[Robert Harris]

So explain to me why a non turbo diesel truck engine makes 800 to a 1000 ft
lbs torque at some ridiculously low rpm  and yet don't even make 300 HP and
by the way turns to shrapnel about 3000 rpm so we can't even test the
crossover number.  Also, remembering the 391 Ford truck engine - about 400
ft/lbs torque at around 2000 rpm and only about 225 hp and again no way
Jose will it ever see over about 4000 rpm.

If the first ingredient ain't Habanero, then the rest don't matter.
Robert Harris <bob at bobthecomputerguy.com>


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> From: DICK BREWSTER <dick_brewster at fmc.com>
> To: Fuel Injection List <DIY_EFI at coulomb.eng.ohio-state.edu>
> Subject: Torque BS Filter    ``
> Date: Friday, February 21, 1997 5:50 AM
> 
> 
> 
> 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