[DML] Re: Delorean Choice of PRV

["content22207" <brobertson@xxxxxxxxxxxx>]

Regarding DMC's decision of the PRV as the best engine choice at the time:

The PRV catches a lot of flak in the Delo community, but it really
isn't a bad little engine, even in the low compression normally
aspirated form we all know and love. DMC's stock exhaust setup does
hobble it tremendously. I also think that Lambda runs it too lean, and
DMC definitely uses too much spark advance (am I the only one to
notice that DMC advises 13 degrees at idle, which BTW is set 125 RPM
lower than Volvo F series, yet Page C:05:03 of the Workshop Manual
clearly shows Volvo's 10 degree timing mark?). My vehicle is hardly
tuned for performance -- it is tuned to get to Pigeon Forge after a
catastrophic engine failure less than two weeks before showtime -- yet
it still outperforms stock DMC's. A few simple modifications can open
a whole new world of driving fun.

Since you mentioned the AMC 2.5, here's a bit of trivia: The 2.5 is
fundamentally nothing more than a 258 with two cylinders cut off --
further evidence of that venerable engine's good design. Chrysler had
to use it because Lee Iacoca, in his infinite wisdom, had thrown away
all of Chrysler's cast iron blocks. The LH platform (designed by AMC
engineers while Chrysler's people tinkered with what was left of the K
platform) also used the PRV, although I think it was even fire by that
point.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "therealdmcvegas" <dmcvegas@...> wrote:
>
> Actually, that still only half-true.
> 
> An engine does have to be certified on it's own as an engine. That
in itself IS a lengthy 
> process. Next it must be tested in an individual vehicle platform,
which is a far less 
> lengthy process comparatively. This proves that under load of a
particular vehicle 
> platform, it still stays withing emissions standards.
> 
> http://www.epa.gov/otaq/certdata.htm
> 
> I.e. a Ford 302/5.0L V8 engine would be tested as an engine for
meeting emissions 
> standards, and would then have had 2 seperate tests performed on it
to see how well it 
> does when installed into separate vehicle plaforms: 1. FOX Body
(Mustang/Capri/Crown 
> Victoria/Grand Marquis), 2. Light Truck (F-150/Bronco). And so on as
the new vehicle 
> platforms are introduced, and new engine options are introduced as well.
> 
> 2nd example: AMC 2.5L I-4. First tested as an individual engine, and
then proven it would 
> work fine within the light truck platform, it could be installed
into Jeep Wrangler/
> Cherokee/Dodge Dakota (1996 only). But then when it was installed
into cars, it had to go 
> through new rounds of brief testing. Then it was installed into the
Dodge Monaco and 
> Eagle Premier with share the same platform.
> 
> So, with the DeLorean, the PRV was the best choice at the time it
seemed (it seems like the 
> Rover V8 would have fit the bill better). The engine was already
certified to be used within 
> the United States, and would only undergo minimal testing for
emissions to prove it would 
> do well when installed into the DMC-12. This also lead to severely
detuning the engine, 
> and installing such a restrictive catalytic convertor. The went
overboard to ensure that no 
> delays. In any case, no, the engine wasn't just a drop-in, but yes
he engine was chosen 
> because it had the most lengthy and expensive testing on it already
completed. 
> 
> -Robert
> vin 6585 "X"
> 




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