 |
Swirl and Tumble are 2 different types of motion the air/fuel charge
can exhibit as it enters the cylinder on the intake stroke.
Generally, swirl is measured on 2 valve engines and tumble is measured
on 4 valve engines. However, if you are looking for that
extra 0.5% power and want to completely measure differences between
different head modifications, you would want to measure both.
|
Illustration of Swirl Motion
Illustration of Tumble Motion
(+ directions shown are not necessarily an industry standard)
Tumble fixture shown above with separate head and bore adapter,
Current Design, as of April
2005.
Close up of optional Swivel Adapter, to measure tumble in
360 degrees of head orientation. Note: This is a small 65mm
bore.
You need our
Swirl Meter
to measure
tumble. The tumble fixture lets you mount the swirl meter sideways
so you can measure tumble motion. Tumble fixtures are all custom
for different bore sizes and head bolt patterns, and are quoted individually.
Several options are available for the tumble fixture, including:
-
Individual, changeable bore sleeves and
head bolt adapters so one tumble adapter can be used for several
engine designs.
-
Piston Adjuster to
see if piston top/dome shape influences tumble.
-
Swivel Adapter to check
tumble at several different orientations (and it changes "big
time" in different orientations).
|
