Re: AMC 4-cylinder in a Spirit (Revisited)

[farna@xxxxxxx]

Someting like you suggested is what I meant -- they just published the torque number at an rpm more comparable to faster turning V-6 engines than a low rpm peak number. 

Right -- the Jeep four should be tuned to pull steeper gearing than a car engine would. The best gearing for a Jeep engine in a car should therefore be somewhere between the two because of the weight and load carrying differences. 

On September 29, 2005 andrew hay wrote:

> i don't think they can actually -fake- numbers - but they sure can
> -shade- them.
> 
> i recall reading that the [L88?] corvette 427 was officially rated for
> marketing purposes as 435hp@5300rpm, and it actually made these
> numbers - but the real peak was more like 535hp@6200rpm, and engineers
> saw 600+ on a tuned-but-stock engine on a dyno.
> 
> i would expect a four to be cammed and generally set up more radically
> than a six, just to better haul the same mass around with less power.
> it'll have to pull taller gears, so tune it accordingly.
> 
> i don't think there's anything inherently different between fours and
> sixes, unless it's long straight-six intake manifolds, and that
> doesn't apply to the injected 2.5 and 4.0.
> ________________________________________________________________________
> Andrew Hay                                  the genius nature
> internet rambler                            is to see what all have seen
> 
> adh@xxxxxxxxxxxxxxxxx                       and think what none thought


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