Super on a Diesel? sure thing!
Looks like most supercharged Diesels are found in the history books, and in
VERY large machienery like giant boats and trains. They also tried them in
airplanes, but didnt work too well.
WOW! now thats an engine bay!!
I have also heard or a Diesel with BOTH a super AND a turbo! lets see if I
can find one of those
This one doesnt have much to do with Supercharged Diesels, but I ran accross
it in teh search, and couldnt help but scratch my head at this one.
Refinish King wrote:
There are supercharged diesels:
GMC 671 superchargers originally came from diesel applications, onto funny
car and dragsters. but they weren't street diesels, they were heavy
equipment diesels: i.e. Euclid dump trucks, for mining and large earth
moving projects. heavy drag line shovels and front end loaders.
A blower would definately up the ante
quite a bit, but a turbo is free horsepower since it uses spent exhaust
gases to spin the turbine.
the supercharger is belt-driven off the crank and takes power to make power.
I could think of easier ways to make serious power with the $3k it's gonna
take to aspirate that motor.
Do it like u wanna neighbor..........
A turbo setup would make some very nice power, but turbo kits are far less
common since they are much harder to install and usually more costly then a
A turbo or super would make good power for acceleration, but do not offer
any help in compression braking for slow desents. If its good power, lots of
low end torque, and good compression braking, then a 383 stroker is the way
There is no replacement for displacement!
since a super is the most likely option here, lets ask a different question,
Whats better for the OP's truck, a roots type, or a centerfusial?
Intercooler or no (if so, air to air, or air to water?)? how much boost
should be run? Would a super improve the low end at all or just the top half
of the tach?
what other mods should be done at the same time as the super? is the fuel
pump up to the task? what about the T-stat? should he get a cool T-stat? and
then sparkplugs, do you get one heat range cooler for the plugs?
First let me say that I am not the definative authority on Turbos or
Blowers but I will offer my opinions.
IMHO Compression braking is more of a issue when comparing automatic
transmissions versus manual trannys.
Static compression ratio also comes into play here.
If i really wanted a supercharger i would choose a centrifugal blower,
a centrifugal blower is basically the compressor side of a turbo that is
via gear reduction with a belt off the crank.
Roots type blowers use seals (wipers)
to provide the mandatory tight clearance that a highly inefficient roots
blower requires and they are prone to case flexing.
The blower will make good power everywhere, but heat becomes a issue
when u compress air.
Intercooling is good, i don't think your budget would allow for a air/water
unit which is more efficient than a air/air unit,
that's why air/air units are more common.
The air/fuel ratio will have to monitored and modified so u don't "lean out"
the motor and melt a piston.
Anytime u start bumping cylinder pressures colder plugs are in order
to help fight pre-ignition.
The fuel pump should be matched to the BSFC of the motor,
which will be .55-.60 after supercharging.
however u decide to modify the dwell and duty-cycle of the injectors is up
whether it be via using a aftermarket PROM chip,
increasing injector size and/or rail pressure or a stand-alone programable
EFI computer such as this one:
Engine temperatures will be higher so modifying or replacing the thermostat
will also be mandatory.
HP=[(injector size(lb/hr)x duty cycle)/BSFC]x(# of injectors)
Free horsepower? No, not true. The turbo creates back pressure in the
exhaust. If you had the same boost without the backpressure the horsepower
would go up. Tell us why Ford and GM dropped turbos and went to belt driven
superchargers. Is Chrysler the only American, well quasi American, turbo
Many GM Diesels had superchargers. Like almost all of the 2 stroke
All 2 stroke diesels have blowers. I've posted this once before, but here's
the pic again because it's relevant
Detroit diesel 8V-92. Turbocharger feeds the blower. And that little
cylindrical item to the right of where the turbo/ blower meet is a bypass
valve. So as the turbo picks up and over takes the blower output the valve
opens and the blower is partially bypassed.
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