Thom Bates
04-16-2006, 08:35 AM
NMRA RULES REVISIONS & TECH BULLETINS
1. 2005-2006 Mustang Frame Rail Notching / Classes: Hot Street, Drag Radial, Super Street Outlaw
2005-06 Ford Mustang rear frame rails may be notched a maximum of 2-inches vertically for rear end housing clearance only. The upper part of the rail must remain intact.
2. Nitrous Bottle Section 1.9 / Classes: EFI Renegade
Up to two (2) 15-lb nitrous bottles are permitted in nitrous-equipped entries.
3. Qualifying / Classes: Pro 5.0
Pro 5.0 eliminator will be contested with a 16-car qualified field.
4. Turbo Size / Pro 5.0 & Drag Radial
Pro 5.0 106mm turbo size will be measured as follows: inducer wheel = 4.173-inch, inlet diameter = 4.253-inch. Drag Radial 88mm turbo size will be measured as follows: inducer wheel = 3.464-inch, inlet diameter = 3.544-inch.
5. Head Porting 2-Valve / Real Street
2-valve combinations may port cylinder heads with a 50-lb weight penalty.
6. Factory Stock / Brakes
5-lug OEM Ford brake may be retrofitted to cars originally equipped with 4-lug brakes.
7. Pure Street / 3-Valve Modular Camshaft Lift
3-valve Modular camshafts will be limited to .480-inch lift
8. Real Street & Pure Street / Section 9.2 Wide-band Devices
Stand-along wide band oxygen sensors and recorders permitted, however device may not be capable of datalogging additional sensors and/or analog inputs, with the sole exception of tachometer signals. Any wide-band 02 device must be capable of only logging air/fuel ratio, and/or engine speed, and may not be run in closed loop with EFI or ignition system.
9. Renegade / Superchargers
4.6L Modular engines utilizing Kenne Bell or Whipplecharger style superchargers may use adapter plate that is OEM included in the kit.
10: Pro 5.0, SSO, Drag Radial, Hot Street, Renegade, Pure Street / Intake Manifold
BBK Intake Manifold PN #5001 accepted.
11. Drag Radial, Hot Street, Renegade, Pure Street / RHS Cylinder Heads
RHS Small Block Ford Windsor heads accepted in the following categories: 180cc (Iron & Alum) in Drag Radial, Hot Street, Renegade, Pure Street. 200cc & 215cc (Iron & Alum) in Renegade, Hot Street, Drag Radial only.
12. Factory Stock/Real Street / 3-Valve Camshaft lift
Stock camshaft lift on 3-valve will be measured as follows: .439-inch intake and .436-inch exhaust.
13. Hot Street, Drag Radial / Annular Boosters
Carburetor-equipped engines in Hot Street and Drag Radial are permitted to utilize conventional-type factory-style annular boosters.
Added 3/26/06
14. Factory Stock / Oil system Section 1.10
Canton oil pan #13-600 is permitted on 5.0L applications.
15. Brackets E.T. Limitations
NAME E.T.
Pro Ford 12.99 & Faster
16. Pro5.0 / Turbochargers
Replace Section 1.23 with:
1.23 TURBOCHARGERS
Only single or twin (two identical) turbocharger(s) permitted as follows:
1.23a) SINGLE TURBOCHARGER: Accepted single turbochargers are permitted with the following requirements: Turbocharger must be of conventional impeller and housing design and type. Turbocharger is limited to a choice of four turbochargers (at four weight breaks):
[1] maximum size of 94 mm/3.700 - inducer wheel diameter at the point where the leading edge of the compressor wheel meets the inlet housing. Inlet housing is permitted a maximum inlet diameter of 3.780 where the leading edge of the compressor wheel meets the housing.
[2] maximum size of 96.5 mm/3.800 - inducer wheel diameter at the point where the leading edge of the compressor wheel meets the inlet housing. Inlet housing is permitted a maximum inlet diameter of 3.880 where the leading edge of the compressor wheel meets the housing.
[3] maximum size of 98.0 mm/3.858 - inducer wheel diameter at the point where the leading edge of the compressor wheel meets the inlet housing. Inlet housing is permitted a maximum inlet diameter of 3.938 where the leading edge of the compressor wheel meets the housing.
[4] maximum size of 101.0 mm/3.976 - inducer wheel diameter at the point where the leading edge of the compressor wheel meets the inlet housing. Inlet housing is permitted a maximum inlet diameter of 4.056 where the leading edge of the compressor wheel meets the housing.
Compressor wheel to housing clearance must maintain a maximum of 0.080 clearance beginning from a) where the leading edge of the compressor wheel meets the inlet of the compressor housing to b) the transition point where the trailing edge of the compressor wheel meets the volute. All air entering the turbocharger must pass through the turbocharger inlet. Injection of any liquid, gas, or any other substance into the inlet or exhaust housing is prohibited. Turbocharger compressor wheel must be constructed of cast or billet aluminum. Exotic material wheels prohibited. The tips of the impeller wheel may not be stepped, cut down, or notched to meet impeller tip-to-tip dimension. (.500-inch will define the tip of the impeller wheel).
1.23b) TWIN TURBOCHARGERS: Accepted twin turbochargers are permitted with the following requirements: Both turbochargers must be of conventional impeller and housing design and type. Turbochargers are limited to a maximum size of 76 mm/2.992 - inducer wheel diameter at the point where the leading edge of the compressor wheel meets the inlet housing. Inlet housing is permitted a maximum inlet diameter of 3.078 where the leading edge of the compressor wheel meets the housing. Compressor wheel to housing clearance must maintain a maximum of 0.080 clearance beginning from a) where the leading edge of the compressor wheel meets the inlet of the compressor housing to b) the transition point where the trailing edge of the compressor wheel meets the volute. All air entering the turbocharger must pass through the turbocharger inlet. Injection of any liquid, gas, or any other substance into the inlet or exhaust housing is prohibited. Turbocharger compressor wheel must be constructed of cast or billet aluminum. Exotic material wheels prohibited. The tips of the impeller wheel may not be stepped, cut down, or notched to meet impeller tip-to-tip dimension. (.500-inch will define the tip of the impeller wheel).
17. Drag Radial / Front Fascia
Add to Section 7.19: Hole(s) in front bumper for the purpose of air induction prohibited. - Effective 5/1/06
18. Pure Street / Carburetors - Air cleaners
Add: 1.19b) AIR CLEANER: Commercially available, mass produced, unmodified, automotive type air cleaner required. All incoming air must pass through air cleaner.
19. Brackets Electronics
Add: Timing system cross-talk will be activated in all electronic classes
20. Real Street & Factory Stock Cylinder Heads
Revise: 1.18e) RETAINERS: Only Steel retainers permitted. Titanium or composite retainers prohibited.
21. Real Street & Factory Stock Cylinder Heads
Revise 1.18h) ROCKER ARMS: Conventional stud or pedestal mount rocker arms required. Shaft rocker arms and stud girdles are prohibited.
Added 3/29/06
22. Drag Radial - Wastegate/Exhaust Systems
Mufflers are not required on wategate outlets.
Added 4/16/06
23. Factory Stock - Exhaust
Revise 1.3a: 5.0L Pushrod-powered entries only may utilize long-tube type headers with a maximum tubing size of 1.625-inches (1-5/8) with a 3-inch maximum collector. Stepped headers are prohibited, header must use same 1.625-inch tubing from header flange through collector. Standard small-block Ford bolt-pattern header flanges are required, maximum thickness 3/8-inch. Adapter plates are prohibited. Merge-style collectors or megaphones are prohibited.
24. Factory Stock - Camshaft
Revise Section 1.18 : Aftermarket hydraulic roller camshaft with non-stock duration or lobe seperation permitted for 5.0L pushrod applications only. Camshaft maximum lobe lift is .278-inch; Minimum lobe lift is .270-inch. Maximum valve lift at the retainer not to exceed .480-inch.
25. Real Street Base Weights
Revise Base weight of 4.6 2V supercharged to 3,075 lbs minimum.
1. 2005-2006 Mustang Frame Rail Notching / Classes: Hot Street, Drag Radial, Super Street Outlaw
2005-06 Ford Mustang rear frame rails may be notched a maximum of 2-inches vertically for rear end housing clearance only. The upper part of the rail must remain intact.
2. Nitrous Bottle Section 1.9 / Classes: EFI Renegade
Up to two (2) 15-lb nitrous bottles are permitted in nitrous-equipped entries.
3. Qualifying / Classes: Pro 5.0
Pro 5.0 eliminator will be contested with a 16-car qualified field.
4. Turbo Size / Pro 5.0 & Drag Radial
Pro 5.0 106mm turbo size will be measured as follows: inducer wheel = 4.173-inch, inlet diameter = 4.253-inch. Drag Radial 88mm turbo size will be measured as follows: inducer wheel = 3.464-inch, inlet diameter = 3.544-inch.
5. Head Porting 2-Valve / Real Street
2-valve combinations may port cylinder heads with a 50-lb weight penalty.
6. Factory Stock / Brakes
5-lug OEM Ford brake may be retrofitted to cars originally equipped with 4-lug brakes.
7. Pure Street / 3-Valve Modular Camshaft Lift
3-valve Modular camshafts will be limited to .480-inch lift
8. Real Street & Pure Street / Section 9.2 Wide-band Devices
Stand-along wide band oxygen sensors and recorders permitted, however device may not be capable of datalogging additional sensors and/or analog inputs, with the sole exception of tachometer signals. Any wide-band 02 device must be capable of only logging air/fuel ratio, and/or engine speed, and may not be run in closed loop with EFI or ignition system.
9. Renegade / Superchargers
4.6L Modular engines utilizing Kenne Bell or Whipplecharger style superchargers may use adapter plate that is OEM included in the kit.
10: Pro 5.0, SSO, Drag Radial, Hot Street, Renegade, Pure Street / Intake Manifold
BBK Intake Manifold PN #5001 accepted.
11. Drag Radial, Hot Street, Renegade, Pure Street / RHS Cylinder Heads
RHS Small Block Ford Windsor heads accepted in the following categories: 180cc (Iron & Alum) in Drag Radial, Hot Street, Renegade, Pure Street. 200cc & 215cc (Iron & Alum) in Renegade, Hot Street, Drag Radial only.
12. Factory Stock/Real Street / 3-Valve Camshaft lift
Stock camshaft lift on 3-valve will be measured as follows: .439-inch intake and .436-inch exhaust.
13. Hot Street, Drag Radial / Annular Boosters
Carburetor-equipped engines in Hot Street and Drag Radial are permitted to utilize conventional-type factory-style annular boosters.
Added 3/26/06
14. Factory Stock / Oil system Section 1.10
Canton oil pan #13-600 is permitted on 5.0L applications.
15. Brackets E.T. Limitations
NAME E.T.
Pro Ford 12.99 & Faster
16. Pro5.0 / Turbochargers
Replace Section 1.23 with:
1.23 TURBOCHARGERS
Only single or twin (two identical) turbocharger(s) permitted as follows:
1.23a) SINGLE TURBOCHARGER: Accepted single turbochargers are permitted with the following requirements: Turbocharger must be of conventional impeller and housing design and type. Turbocharger is limited to a choice of four turbochargers (at four weight breaks):
[1] maximum size of 94 mm/3.700 - inducer wheel diameter at the point where the leading edge of the compressor wheel meets the inlet housing. Inlet housing is permitted a maximum inlet diameter of 3.780 where the leading edge of the compressor wheel meets the housing.
[2] maximum size of 96.5 mm/3.800 - inducer wheel diameter at the point where the leading edge of the compressor wheel meets the inlet housing. Inlet housing is permitted a maximum inlet diameter of 3.880 where the leading edge of the compressor wheel meets the housing.
[3] maximum size of 98.0 mm/3.858 - inducer wheel diameter at the point where the leading edge of the compressor wheel meets the inlet housing. Inlet housing is permitted a maximum inlet diameter of 3.938 where the leading edge of the compressor wheel meets the housing.
[4] maximum size of 101.0 mm/3.976 - inducer wheel diameter at the point where the leading edge of the compressor wheel meets the inlet housing. Inlet housing is permitted a maximum inlet diameter of 4.056 where the leading edge of the compressor wheel meets the housing.
Compressor wheel to housing clearance must maintain a maximum of 0.080 clearance beginning from a) where the leading edge of the compressor wheel meets the inlet of the compressor housing to b) the transition point where the trailing edge of the compressor wheel meets the volute. All air entering the turbocharger must pass through the turbocharger inlet. Injection of any liquid, gas, or any other substance into the inlet or exhaust housing is prohibited. Turbocharger compressor wheel must be constructed of cast or billet aluminum. Exotic material wheels prohibited. The tips of the impeller wheel may not be stepped, cut down, or notched to meet impeller tip-to-tip dimension. (.500-inch will define the tip of the impeller wheel).
1.23b) TWIN TURBOCHARGERS: Accepted twin turbochargers are permitted with the following requirements: Both turbochargers must be of conventional impeller and housing design and type. Turbochargers are limited to a maximum size of 76 mm/2.992 - inducer wheel diameter at the point where the leading edge of the compressor wheel meets the inlet housing. Inlet housing is permitted a maximum inlet diameter of 3.078 where the leading edge of the compressor wheel meets the housing. Compressor wheel to housing clearance must maintain a maximum of 0.080 clearance beginning from a) where the leading edge of the compressor wheel meets the inlet of the compressor housing to b) the transition point where the trailing edge of the compressor wheel meets the volute. All air entering the turbocharger must pass through the turbocharger inlet. Injection of any liquid, gas, or any other substance into the inlet or exhaust housing is prohibited. Turbocharger compressor wheel must be constructed of cast or billet aluminum. Exotic material wheels prohibited. The tips of the impeller wheel may not be stepped, cut down, or notched to meet impeller tip-to-tip dimension. (.500-inch will define the tip of the impeller wheel).
17. Drag Radial / Front Fascia
Add to Section 7.19: Hole(s) in front bumper for the purpose of air induction prohibited. - Effective 5/1/06
18. Pure Street / Carburetors - Air cleaners
Add: 1.19b) AIR CLEANER: Commercially available, mass produced, unmodified, automotive type air cleaner required. All incoming air must pass through air cleaner.
19. Brackets Electronics
Add: Timing system cross-talk will be activated in all electronic classes
20. Real Street & Factory Stock Cylinder Heads
Revise: 1.18e) RETAINERS: Only Steel retainers permitted. Titanium or composite retainers prohibited.
21. Real Street & Factory Stock Cylinder Heads
Revise 1.18h) ROCKER ARMS: Conventional stud or pedestal mount rocker arms required. Shaft rocker arms and stud girdles are prohibited.
Added 3/29/06
22. Drag Radial - Wastegate/Exhaust Systems
Mufflers are not required on wategate outlets.
Added 4/16/06
23. Factory Stock - Exhaust
Revise 1.3a: 5.0L Pushrod-powered entries only may utilize long-tube type headers with a maximum tubing size of 1.625-inches (1-5/8) with a 3-inch maximum collector. Stepped headers are prohibited, header must use same 1.625-inch tubing from header flange through collector. Standard small-block Ford bolt-pattern header flanges are required, maximum thickness 3/8-inch. Adapter plates are prohibited. Merge-style collectors or megaphones are prohibited.
24. Factory Stock - Camshaft
Revise Section 1.18 : Aftermarket hydraulic roller camshaft with non-stock duration or lobe seperation permitted for 5.0L pushrod applications only. Camshaft maximum lobe lift is .278-inch; Minimum lobe lift is .270-inch. Maximum valve lift at the retainer not to exceed .480-inch.
25. Real Street Base Weights
Revise Base weight of 4.6 2V supercharged to 3,075 lbs minimum.