If I read it right the 2.8 is a 2.25 that has been stroked to 2.5 and then
over bored. I think they sleeved the block and overbored it, although I don't
remember that detail that well. The pistons were special with a wedge cut on
one side to squeeze the mixture toward the spark plug for better combustion
control. The torque curve is very impressive starting with about 130 lb-ft at
idle and reaching 177 lb-ft at a high mid range. (3200 RPM?)
If I had the bucks (and a SII or later truck)...
Bill Lawrence
Kirk Hillman wrote:
> I may be totally off base, but I thought they used the 2.5l petrol, not
> the 2.25l to massage into the 2.8. Also, I believe it is stroked with a
> custom crank. However, I have no idea if they bored it over as well.
> As for the 2.25, 0.060" is the max I have ever heard of. The manual
> suggests 40 thou. as max but a few manufacturers have gone over that.
>
> Kirk
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