Re: [DML] Performance mods

["B Benson" <delornut@xxxx>]

>What it comes down to is the odd-fire crank in the >DeLorean engine is
simply not suitable for turbocharging, >and that is only at the top of a
very long
> list of problems with turbocharging this engine.
> > Martin
> > #1458
> > #4426

Remember the Buick Grand National engines were odd firing V-6's and some
have tuned them to well over 500HP.




>My perspective is that I already have
> the odd-fire DMV motor and see substancial gains >without breaking the
bank
> or my drive train. Has anyone else attempted a
> ported, polished (induction as well as exhaust), turbocharged (single or
> twin), intercooled, water injected DMC/PRV yet?
>
> Don E.
> #6543

An example of velocity is an unrestricted garden hose flowing water on a
wheel making it spin. Now put your finger across the end of the hose and
restrict some flow but increase the velocity. The wheel spins faster. The
faster spin on a turbo makes the forced induction quicker. The other side of
the coin is what goes in must come out. That's where the balancing act for
exhaust flow gets tricky. Ports opened up too much can defeat the efficiency
of forced induction. Also, the wrong flow pattern through the combustion
chamber, even too much free flow, can actually reduce power. For example if the port is opened even a few thousands too much near the venturi area behind the valves the intake charge can ram into the back of the intake valve rather than flow around it. This obstucts the flow into the combustion chamber. It's all a balancing act and the best approach is learned through experience.The rule of thumb here is the smaller you can make induction system components without reducing horsepower output, the better your car will perform. What Martin pointed out regarding already designed heads and engines makes a lot of sense. The Renault engineers have done the work of finding the right combination. When you have one engine to experiment with in your own garage it gets pretty limited. You really don't know how much you could relieve the porting until you've gone too far.

Bruce Benson