General

 

1. All rules for the IAMO Hot Farm Tractors are Locked In for the 2008, 2009, and 2010 pulling seasons.

 

Weight

 

1. 9,000 lbs Limit.

 

Engine

 

1. RPM limits shall be as follows:  3500 RPM with 1% tolerance for tractors 410 cubic inches and smaller.  3200 RPM with 1% tolerance for tractors from 411 cubic inches through 440 cubic inches.  3000 RPM with 1% tolerance for tractors 441 cubic inches and up.
2. All tractors will be equipped with approved female RPM telemetry.
3. 466 cubic inch limit.  Any tractor of larger cubic inch must be stock cubic inch for make and model of tractor.  NO exceptions.  Only those tractors with cubic inch displacements larger than 466 will be allowed to pull if they make the first pull of the 2005 pulling season.  After that date no tractors larger than 466 cubic inches will be allowed to join the class.  A list of qualified tractors is on file with the IAMO Board of Directors.
4. Tractors must run stock intake manifolds. 
5. No inter or after-coolers allowed.
6. Exhaust will have two 5/16” bolts as close to the elbow as possible at a 90 degree angle from each other and no more than 2” apart.

 

Fuel System/Turbo

 

1. Fuel Injection Pumps will be stock in appearance for that make and model.  A single 10mm Bosch “A” series injection pump is allowed for all diesel tractors.  NO “P” pump equipped tractor is allowed. 
2. RoosaMaster max at 450 head
3. Ambac 100 max at 13mm
4. Simms max at 11.5mm
5. Water injection systems are allowed.  Only water and approved lubricants are allowed.  This is open for random inspection and water may be provided for all tractors competing during any given event without notice.  Violation of this rule qualifies as cheating and tractor, regardless of owner, is banned for one year and one day from the date of the infraction.
6. Turbo size shall be limited to one turbo not to exceed a 2.75” inlet.  A compressor measurement at the face of the wheel inlet will not exceed a maximum of 2.75”.  The wheel may be no larger than this measurement.  Only factory MAP width enhancement groove of .125 or less will be allowed.  Wheel must protrude into housing 1/8^th of an inch. 
7. NO permanent or removable “slug” or “reducer” is allowed.

 

Tires and Wheels

 

1. 20.8 x 38 or 24.5 x32 is allowable maximum size.  Any cut allowed.  No tires wider than 25”
2. Front tires maybe no smaller than 7.50x15 or 7.5Lx15 on any rim width.

 

Hitch

 

1. Drawbars will not exceed over 20” from the ground at the point of hook and be a minimum of 18” from the center line of the rear axle to the point of hook.
2. NO pulling for 2 or 3 point hitches is allowed.

 

Safety

 

1. All drivers must wear an approved fire suit and DOT certified helmet.
2. All trucks will be equipped with a fire extinguisher within the reach of the driver.
3. All tractors will be equipped with wheelie bars.  Not more than 10” above the ground and no less than 20” from the outside across the pads.  Must have a minimum of 5” square pads and has to support the weight of the tractor.
4. All tractors will have a scatter blanket or steel band around the bell housing.
5. All tractors with engine driven radiator fan must be equipped with side shields.
6. All tractors will have an air kill switch placed on over 8” from the centerline of the tractor and not higher than 48” from the drawbar. 
7. Tractor’s weights must not interfere with kill switch or the placement of the chain from the sled.
8. All tractors shall be equipped with roll over protection.  Whether it is of an OEM or Multiple bar design.
9. NEW FOR 2010: All tractors must be equipped with front stabilizer bars or skis. The lower most portion of the bar must be no higher than 4" off the ground.