Willowbank Race Precinct (Champions Way)
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CLUB WEBSITE & CONTACTS
http://www.ipswichcitydirtkarts.com/
ENGINE RULES:
GROUPS
9.1 There are 3 Junior events, 5 Group events and 1 Modified event.
9.1.1 They are known as:
o Junior 1
o Junior 2
o Junior 3
o Groups 1, 2, 3, 4, 5
o Modified
Note: Group 1 is the beginner/slowest adult group and Junior 1 is the beginner/slowest junior group.
9.2 All Drivers that race will be subject to grading according to Kart and Driver performance (including juniors) as deemed appropriate by I.C.D.K.C Management Committee. The faster the combination, the higher the Group you will be required to participate in. All members will be reviewed on a quarterly or as needs basis by the I.C.D.K.C Management Committee and will be requested to move groups as deemed necessary or will be monitored until the next scheduled review.
Movement of drivers will be based on a range of criteria including but not limited to the following:
o Driver Ability/Performance
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o Kart Speed/Handling and Performance
o Experience of the driver
o Point Allocation for both rounds and across the meets
o Averages based on benchmarks
o Group sizes
10. Summary of Engines
4 Stroke single cylinder OHV or OHC industrial based engines with an original capacity of up to and including 220.00cc
10.1 Engines must maintain at all times a maximum capacity of up to 220.00cc.
Engines that have been manufactured larger than 220.cc and then downsized are NOT allowed to be used. SIDE VALVE ENGINES are allowed to maximum of 300.00cc. No motorcycle engines or 2 strokes are allowed to race. If you have an engine that you wish to race that you believe is compliant, that is not shown on the following list then please give the technical scrutineer the specifications prior to putting it on your kart, to ensure conformance. Thank you.
Authorised Engine List Standard Bore/Stroke
1. Briggs and Stratton 6hp Vanguard (68x50) 7.5 Vanguard (72x53)
Intek (68x52) World formula/animal (68x56)
2. Honda & copy GX160 (68x45) GX200 (68x54)
Clone Hondas (68/70x54)
3. Yamaha MZ175 (66x50) BurrisYF200 (71x50)
4. Subaru Ex21 (67x60) Kx21 (67x60)
5. Kohler Pro 6 (66x50) Xke6 (67x51) pro 7 (54x70)
6. Kawasaki Fe 170 (66x50)
These are the engines authorised to race, if your engine is not on this list authorisation is required. Contact technical scrutineer before purchasing engines to ensure conformance.
10.2 You may make modifications to your engine as long as any modifications remain compliant with the Allowable Modifications listed under Clause 11 for Juniors, Clause 12 for Group Racing or Clause 13 for Modified.
11. Allowable Specifications in Juniors 1 & 2 & Group 1
(Junior 3 to follow Group Racing Modifications)
11.1 Any component EXCLUDING carburettors from the range of allowed engines can be used in any combination. All aftermarket parts can be used. The basic engine will be defined by the engine block. Therefore rule 11.2 dictates for example, 6 hp vanguard block must use 6 hp vanguard carburettor. 6.5 hp Chinese Honda block must use 6.5 hp Chinese Honda carburettor. The world formula engine can be used only with the 6hp mikuni originally fitted to a 6hp Briggs and Stratton vanguard. NO EXCEPTIONS or “similar” carbs will be accepted.
11.2 The OEM (original equipment manufacturer) carburettor that comes standard with the basic engine MUST be used. It can be modified and bored to any size possible, no restrictions. To clarify this rule, e.g. OEM carburettor does not mean any carburettor from that manufacturer, it means THE ORIGINAL CARBURETTOR SUPPLIED ON THE ENGINE, if in doubt ask the scrutineer before fitting to your engine. The basic engine is as supplied by the original manufacturer only. Not a tuning companies aftermarket product e.g. Tillotson carburettor on yf200r1.
11.3 The machining and or lightening of cast iron flywheels is prohibited. All clone engines e.g. (Honda copy) are required to run either a Billet alloy flywheel or genuine Honda flywheel. Billet alloy flywheels are recommended on all engines. Page 9 of 26
11.4 Diaphragm or electric fuel pumps are allowed. In the case of an electric pump, dry cell sealed batteries only allowed, positioned and securely mounted to the kart.
11.5 Recoil or electric starters are optional.
11.6 Air cleaners and exhausts may be replaced or modified but must be securely mounted at all times.
11.7 Fuels that can be used are:
1. All pump fuels e.g.: E10, 95, 98, Unleaded
2. Avgas
3. Fuel Additives are allowed e.g. Octane Boosters
4. Methanol (Modified Group Only) Conditions Apply.
11.8 Methanol of any ratio or mixture is strictly prohibited in Junior and Group racing. Penalties will apply if any driver is deemed to be non-compliant with this requirement.
11.9 Juniors and Group 1 drivers are not permitted to use slide or diaphragm carburettors of any size. Only the OEM (Original Equipment Manufacturer) “draw butterfly carburettors” are allowed. Except for Junior 3-(Refer Group Racing Modifications Rule 12.2)
12. Allowable Modifications in Groups 2,3,4,5 & Junior 3
12.1 Any component from the range of allowed engines can be used in any combination. All aftermarket parts can be used including all billet parts. The basic engine will be defined by the engine block. This rule means cylinder heads, crankshafts, valvetrains, flywheels etc can be used in any combination. This rule does not mean sidevalve 300.cc components can be used on ohv or ohc engines, or that ohv or ohc parts can be used on a 300.00cc side valve engine. Please ask the technical scrutineer prior to building a hybrid engine to verify its conformance. All discussions will be strictly confidential.
12.2 The OEM (Original Equipment Manufacturer) carburettor that comes standard with the Basic engine can be modified and bored to any size possible (No Restrictions). If a Slide or Diaphragm carburettor is used the following restrictions apply. 20 MM VENTURI. for a butterfly type carburettor. Measured at the narrowest section in the carburettor where the main jet/emulsion tube protrudes into the bore. For a slide carburettor measured at the narrowest section in the body of the carburettor. 25.4 MM Diameter butterfly is the maximum allowed. The pz26 walbro standard fitment to the basic World Formula engine is the only exception and is allowed on all adult groups (except Group 1) engines including Junior 3. IF YOU ARE PLANNING TO CHANGE YOUR CARBURETTOR, ASK FIRST IF IT WILL BE COMPLIANT.
12.3 Refer to Rule 11-3
12.4 Diaphragm or electric fuel pumps are allowed. In the case of an electric pump, dry cell sealed batteries only allowed, positioned and securely mounted to the kart.
12.5 Recoil or electric starters are optional.
12.6 Air cleaners and exhausts may be replaced or modified but must be securely mounted at all times.
12.7 Refer to Rule 11-7
12.8 Methanol of any ratio or mixture is strictly prohibited in group racing. Penalties will apply if any driver is deemed to be non-compliant with this requirement.
13. Allowable Modifications in Modified Group
13.1 Any of the above modifications in Junior/Group racing are allowed.
13.2 Fuel injection, Turbo Charging, Super Charged or twin engines
Twin engines can only be modified to Group standard specifications.
13.3 Carburettor of any size or make allowed. Page 10 of 26
13.4 Methanol fuel may be used in Modified group only. Karts using methanol must be set up in a separate designated pit area where the kart owner must have their own fire extinguisher on stand by and an official must be notified so proper precautions can be taken in the event of an incident or accident.
13.5 Karts using methanol must carry a blue triangle sticker 50mm x 50mm on both the Nassau panel and rear number plate and must have an appropriate
