[DML] Re: Improving DeLo Exhaust

["content22207" <brobertson@xxxxxxxxxxxx>]

If nothing else, irrespective of performance (which the seat of my
pants does feel improvement...), there's a very good reason to replace
the stock exhaust crossover pipe with true dual exhaust: access. Every
component in the "Valley of Death" is very accessible from underneath
the car once the crossover pipe is out of the way. No joke -- try it
sometime: heater core takeoff barb is right in your face, and the
ignition distributor less than 1/2" beyond it. Clutch slave cylinder
is equally close, though you still need to bleed it from above due to
funny angle of the bleeder screw. You can easily reach all sensors and
the thermal vacuum switch WITH THE INTAKE MANIFOLD IN PLACE. You can
even reach all the way to the back of the water pump.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, mike.griese@xxxx wrote:
> 
> And if you do things without measuring the results, you have no
> idea what you've got.
> 
> I don't trust the seat of anybody's pants...
> 
> What I am saying is that engines, brakes, transmissions, coolant 
> systems etc. are all designed as a system by experienced automotive
> engineers with access to tools that can conclusively show the impacts
> of a change to any part of the system.  Replacing bits and pieces 
> with aftermarket parts that were not specifically designed or tested 
> with the DeLorean with the intent of improving performance based on 
> the component manufacturer's claim is a gamble.
> 
> The Bosch +4 plug is a perfect example.  They don't improve 
> performance in every case.  In fact, they can reduce performance as 
> we have found for the Lotus 9xx engines.  The shape of the 
> combustion chamber, the placement of the plug, and the 
> characteristics of the spark make for less complete combustion
> than with the original equipment plugs.  
> 
> Mucking around with brakes and suspension is particularly
> risky if you don't understand the dynamics of the system.
> Increasing front brake capacity without adjusting the rear
> brake bias can make the car unstable under braking.  This
> increases the liklihood of locking up the front brakes.  Putting
> large diameter, low profile tires, lowering suspensions, 
> changing wheel offsets can have an adverse effect on handling.
> This is why a number of major insurance companies are refusing
> to honor claims for modified import cars.
> 
> I'm not saying that all aftermarket parts are snake oil.  There are 
> a lot of well designed systems that are built for specific applications
> that work quite well.  Often these systems are engineered with 
> the participation of the original manufacturer and are typically done 
> for markets that are much much larger than the DeLorean.  Expecting 
> those same parts to bolt on to the DeLorean and make the same
improvments
> is a stretch.
> 
> --
> Mike
> 
> 
> -------------- Original message from "John Hervey" <john@xxxx>:
-------------- 
> 
> 
> > 
> > 
> > Hey Guy's help me out here, 
> > So, What yall are saying is that when new products come out there
will be no 
> > improvement in performance and efficiency because it wasn't
available 24 
> > years ago for them to evaluate when they designed the car / engine. 
> > Then all the claims that Bosch, MSD, Mallory, K & N not counting
all the 
> > other the 100's of companies that have the engineering money are
wrong. 
> > For example, Bosch in the platinum + 4 plugs. They have poured
Millions into 
> > design and research and state the +4 is the Best plug. MSD again
have poured 
> > millions and have developed a multi million dollar industry in
improved 
> > ignition performance products. 
> > And K & N took 50 year old technology and improved the air filter
from being 
> > big and bulky to compact and spray on the oil. Maybe if spray oil was 
> > invented 50 years ago the old oil bath filter would have never
been made. 
> > If what your are saying is true, then why are engineering
departments all 
> > over the world trying to build a better mouse trap and always
trying to 
> > improve the existing ones. 
> > Sorry, I don't understand: I just know That if you keep on doing
what your 
> > doing then you keep on getting what you got. 
> > John Hervey 
> > 
> 
> [Non-text portions of this message have been removed]








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