On 22 Apr 1998, Peter.Hore@dhs.vic.gov.au wrote:
> I would be interested to know if there were any PI based modifications for
> these police cars, was the PI system upgraded or did they use standard
> sedan or TR5 or TR6 settings and/or equipment?
The police model was available with a 2 litre and 2.5 litre carburettor
engine, as well as the 2.5 PI. To the best of my knowledge, there were no
changes whatsoever in the fuelling department for any of these models,
compared to the standard saloons.
The only difference to the engine was the head. The part numbers for the
police model is 520871 and 520877 for 2 and 2.5 litre, respectively.
I'm not entirely sure about the exact nature of the differences were.
Probably some porting changes, and maybe slightly higher compression.
According to the parts book, the valves are the same.
Since there are no other changes to the engine (e.g. same cam profile,
same fuelling, same exhaust system), I doubt the head would be able to
give more than, say, a maximum of 5 more horses. Sorry, I don't have
any exact figures here.
Other changes were:
Different 1st gear ratio and uprated clutch on manual models.
Differences in auto gear box.
Anti roll bar standard on all models.
Stiffer rear springs (same as estate model).
Plain hub caps.
Bigger alternator (18 ACR instead of 17 ACR).
Calibrated speedometer. Extra observers speedometer optional.
Various electrical fitments: Map lamp, extra switchgear, battery
main switch.
Extra observers internal mirror.
Exterior wing mirrors.
Higher output heater.
> I once heard a story that these 2500 PI's Police cars could out accelerate
> a Jaguar Mk10 (E type engines?) in REVERSE.
A 2.5 PI can most probably out-accelerate a Mk10. The Mk10 has a 3.8 litre
engine with triple carburettors, just like the E-type (don't believe the
Jaguar SAE horsepower claims, though, they are outrageous). This cannot
hide the fact that it is a very big and *heavy* vehicle, much, much
heavier than the PI.
The low reverse ratio would of course give excellent acceleration up to a
certain speed, albeit with a fair bit of wheel spin, but I have serious
doubts as to how often this was excercised in practice!
Egil
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