Choice of Filter Element
There are three factors which need to be considered:
- The overall length of the carburetor installation which must
fit into the C dimension less the thickness of the element (e.g. JC
50, C dim 430 mm, less the side-wall thickness of 15 mm multiplied by
2, thus 430 - (15 x 2) = 400 mm). In most cases, taking a measurement
between the tips of the air horns is sufficient, unless alternator or
firewall clearance is a problem.
- The D dimension which is the overall thickness of the element, important
when brake booster or fender well clearance is an issue.
- The internal clearance of the element or A dimension which establishes
the maximum length of air horn which can be used.
Using the A and B dimensions and the known or projected air horn length,
choose the largest filter (D dim.) that can fit in the available space.
Clearance dimensions from the tips of the air horns to the inside of the
front panel should be calculated as follows: Measure the inside diameter
of the air horn and divide by four (e.g. diameter of TWM full radius air
horn, excluding the rolled edge is 58 mm, therefore ideal clearance
would be 58 divided by 4, i.e. 14.5 mm. ITG's design will permit zero
air horn clearance if loss of efficiency and shortening of foam life
are acceptable. All dimensions are shown in millimeters. For inch measurements,
divide by 25.4. |
