Think about it. A TB spacer would cost about a buck or two to manufacture
in mass quantities. Don't you think an OEM would jump on a 20HP gain and
4MPG improvement for a $1 or $2 investment? If it sounds too good to be
true, it probably is.
Actually it can improve performance. I've seen spacers make gains on
Carbureted engines first hand on engine dynos. Some can improve airflow
for atomized fuel as raising it up creates a more gradual turn.
Different spacers gave better torque and or horsepower, others made both
worse. Just like changing intake manifolds... However you need to keep
in mind they say "up to" XX horsepower. That does not mean "your" engine
will see those gains if any. Now that "tornado" crap that Shade Tree
show guy keeps pushing is pure snake oil. The less you "disturb" and
smooth out the airflow the better.
Spacers seem to work well in situations involving carburetors, or TBI
injected trucks(GM etc)..But since the injection on the Chrysler LA
Magnum is MPFI I don't think it would make much of a difference...Or I
could be wrong completely :)
Doh yeah... All I seen was "throttle body" and figured he might be
talking about a TBI unit. I didnt see any hint he was talking about a
MPFI motor but yeah a spacer wont do a durn thing for one of those. The
only way they get away with stuff like that is to say "up to" even when
The purpose of a throttle body spacer is to move the carburator fuel feed
points out of reversion turbulence. A carburator is ignorant and it depends
on a vacuum signal generated by the venturi effect of ingested air passing
across a venturi to draw fuel from the bowl through the main jet. Anything
that disturbs a laminar airflow inhibits correct fuel mixing. When a high
performance cam is used, the valves are opened earlier and closed later than
the factory cam which generates more airflow and hence more engine power,
but only when the air volume is large enough and the inertia of the air
column is great enough. However, at lower engine speeds, the air in the
inlet manifold and the exhaust pipes actually move both in and out. This
reversing of airflow creates soot on the carburator from exhaust gasses as
well as disturb smooth engine performance at low speeds. Since fuel
injection systems do NOT depend on this vacuum signal for fuel delivery, a
spacer does nothing.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.