|
SECTION 8 - GENERAL ENGINE RULES AND TECHNICAL
PROCEDURES
Governing Philosophy of the Burris National
Speedway Series Technical Regulations The
rules set forth are designed to be a guide for technical inspectors
to insure fair competition within
the Burris National Speedway Series. While the BNSS encourages innovation
and engineering within its technical
guidelines, certain modifications deemed to be against the spirit
and intent of rules set forth shall be
declared illegal. It is the sole discretion of the technical
inspector and race director to decide if
any modification outside of the rules laid down here will be
deemed illegal for competition. Any means of introducing air to the
engine, except from the inlet of
the carburetor is illegal. Any means of modifying the engine or exhaust
system to introduce air or bleed
of exhaust gasses is illegal.
|
| 8.1 |
Gasoline General Rules - All 2 and 4 cycle
engine classes designated “Gasoline only”
will use commercially available roadside
gasoline with a maximum of 93 octane. For
major events or where a spec fuel is desired
the hosting track should specify where the
source fuel is to be obtained. This can be
fuel supplied at the track or a nearby service
station. All 2 cycle classes to use Burris
Castor and/or Blend with 6 oz/gal being the
nominal oil to fuel ratio. |
|
| 8.1.1 |
2 Cycle Gas Tech -The tech inspector
will draw one gallon of fuel from the source of
race spec fuel. The inspector will
add 6 ounces of Burris Castor to the fuel sample.
The sample will be kept in a shaded,
cool location, under the control of the tech
inspector. A Digitron meter must be
set to 000 using the controlled sample. BNSS
recommends zeroing the meter with spec
fuel as opposed to using the cyclohexane
method due to the potential for error
due to regent contamination and other
environmental factors. Use of a single
oil brand allows greater accuracy in the test
results. |
| 8.1.2 |
4 Cycle Gas Tech - The tech inspector
will draw one gallon of fuel from the source of
race spec fuel. The sample will be
kept in a shaded, cool location, under the control
of the tech inspector. A Digitron meter
must be set to 000 using the controlled
sample. BNSS recommends zeroing the
meter with spec fuel as opposed to using
the cyclohexane method due to the potential
for error due to regent contamination
and other environmental factors. |
| 8.1.3 |
Competitors are allowed plus or
minus 10 on the meter. Competitors are eligible for
one re-check following a failed test. |
|
| 8.2 |
Methanol Test General Rules-100% methanol
with no additives or oil is the only fuel
allowed in Methanol specified classes.
|
|
| 8.2.1 |
For major events or where a spec
fuel is desired the hosting track should specify
where the source fuel is to be obtained.
This can be fuel supplied at the track by the promoter
or an approved vendor. Comparison testing can be done with a
hydrometer or by the water test described
below. |
| 8.2.2 |
Methanol water test. Using a clean
glass bottle, fill with less than half of the bottle’s volume
with methanol. Fill with the same amount of distilled water. Mix
thoroughly and let set for five
minutes. If the test sample shows cloudiness, milkiness or
contains precipitates, the participant’s
fuel is illegal. |
| 8.2.3 |
A pump-around fuel distribution
system is a satisfactory replacement for a
hydrometer test or the water test.
|
|
| 8.3 |
4 Cycle Exhaust Systems: The exhaust system
must be of a fixed design and cannot be adjusted
while the kart is in motion. (i.e. no slippy pipes) Length is non tech.
Loop
pipes OK. System may consist of one to three
pieces (header, connector tube and tail
pipe) plus a silencer (if required). Exhaust
pipe/header may not extend past rear
bumper (including silencer, where applicable)
Studs allowed to attach the header to
cylinder head. Sealer and gaskets non-tech.
If a silencer is required the RLV Model
B-91XL* (Pt# 4104) is the only approved model.
* Also referred to as B-91 |
| 8.4 |
2 Cycle Exhaust Systems: The exhaust system
must be of a fixed design and cannot be adjusted
while the kart is in motion. (i.e. no slippy pipes). The pipe must fit
the factory
dimensions and specifications. No modifications
permitted. EGT probes and fittings
are non-tech. Safety wire to secure the end
piece of the system is non-tech. A loose
exhaust can on a kart during a competitive
event is cause for a black flag. |
|
|
| 8.5 |
Combustion Chamber Volume Testing Procedure
- Extreme care must be used to obtain accurate and reliable results.
|
|
| 8.5.1 |
Fill a 25cc (.1cc calibration) burette
with Automatic Transmission Fluid. Care must be taken to allow trapped
air bubbles to escape. Flush the air from the stopcock and outlet.
|
| 8.5.2 |
Install the combustion chamber measuring
plug and torque to 90 in. lbs. Roll the piston to approximately
.100 before top dead center. |
| 8.5.3 |
Fill the combustion chamber with
the designated amount (24cc for F200, 11cc for KT100) of ATF from
the burette. |
| 8.5.4 |
Roll the piston up through top dead
center. If any oil escapes the top of the combustion chamber plug,
the engine is illegal. |
|
|
*special note-engine must be removed from
the kart and combustion chamber plug hole be in a vertical position.
|
|
|
| 8.6 |
Briggs 5 hp Jr. Restrictor
Plates. Flat style only with sharp edge. No bevelled or swaged holes.
Maximum hole diameter is as follows; Purple = .425", Turquoise = .500"
and Gold = .575". |
