Company: Jon Kaase Racing Engines
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Boss Nine Engine Includes Stack Injection
New Design Offers Significant Torque, Tractability
Jon Kaase has introduced his latest Boss Nine design,
energized by an interesting new intake manifold with a hidden plenum below and
stack injection above.
Four-time winner of the Engine Masters Challenge, Kaase has
succeeded in investing this new stack injected Boss Nine engine with
exceptional torque and tractability qualities not usually associated with
stack injection. But the hidden plenum on the underside of the Boss Nine intake
manifold equalizes the pressures in all induction tracts and provides the
engine with a clean, consistent idle, excellent part-throttle performance, and
instantaneous throttle response. The plenum also provides for brake vacuum and
empowers the MAP sensor, which has a major influence in the metering of the
Compared with a carbureted Boss Nine equivalent, the new
stack injection system gives the following performance: On a typical 520cu in
engine with 9.8:1 compression ratio, hydraulic tappets, and running on pump
fuel, the stack injection engine outpaced its carbureted rival by an extra 30ft
Although 520cu in has been the most popular engine
displacement, Boss Nines are available from 429 to 600cu in. So far the most
desirable engines in Kaase’s Boss Nine series have been those producing between
500 and 1,000 horsepower.
Constructed with either a cast iron or a cast aluminum engine block and topped
with Kaase’s efficient hemi cylinder heads, Boss Nine engines were developed
using four intake manifolds. These accept 4150 and 4500-style carburetors, as
well as Keith Wilson’s EFI system, and various BDS blower units.
For more information, contact Jon Kaase Racing Engines, Inc.
at (770) 307-0241 or at JonKaaseRacingEngines.com