The most popular powerplant is a 7,500 to 8,000 horsepower crate engine version of the chrysler 426 cubicinch, 90degree v8 hemi. Is the new pro stock motorcycle rule a kneejerk reaction. Pro stock engines use electronic fuel injection and spec gasoline and are restricted to a maximum of 500 cubic inches. Those classes are grouped into 12 categories, or eliminators, each strictly governed by nhra rule makers. You know heres the rule book and a blank sheet of paper lets see what you. Nhra mello yello drag racing series 5th paragraph page ix 1092019 pro stock motorcycle is the twowheel category in the nhra mello yello drag racing series. Following the nhra s release of efi requirements for pro stock engines yesterday august, intake manifold design will be a highly coveted expertise in the next few months. Aug 14, 2015 holley, teams offer insight into new pro stock efi rules by mike magda august 14, 2015 following the nhras release of efi requirements for pro stock engines yesterday august, intake manifold design will be a highly coveted expertise in the next few months. As a result, we believe nhra fans are in store for some exciting sidebyside racing in the pro stock motorcycle category in 20. One of the key parts of these rules is the factoring numbers that are near the top of the rules. After a single race, the nhra technical department has slapped three latedebuting classes with rules designed to bring parity. Is the new nhra pro stock motorcycle rule a kneejerk. Kaw back in nhra prostock kzrider forum kzrider, kz.
Mountain motors, run by the pdra eighthmile and at selected nhra events in 2019, do not have a 500cubic inch rule, with some engines exceeding 800 cu in. Jan 22, 2015 no busas are running pro stock motorcycle,and all of the suzukis are forced to run old gs cases and heads and limited to 1700 ccs whereas the so called buells and hdsneither actually containing any parts made by either buell or hdare allowed over 2600 ccs160 cubic inches compared to 107 for suzukis. May 19, 2008 nhra rule changes rattle pro stock motorcycle. The nhra pro stock motorcycle class limits all bikes to a minimum wheelbase of 70 inches. Corporately correct engines chevy engine permitted in any gm car, etc. The current nhra pro stock motorcycle elapsed time record is 6. Nhra spent countless hours speaking with the engine builders and manufacturers as well as the race teams to come up with the final engine specifications for 20, said glen gray, vice president of technical operations, nhra. Competitors in pro stock motorcycle have a choice of two drastically different powerplants, both of which are capable of 6. Nhra psm racers react to 20 rule changes competition plus. Nov 11, 2018 the nhra announced today that in 2019, the pro stock category will compete in 18 events in the nhra mello yello drag racing series, which competitors believe is the sweet spot for the category.
This cylinder head is eligible for pro stock motorcycle use only and is contingent that. Nhra to allow any accepted engine body combination in pro stock in 2018 in a historymaking decision made at the request of the teams, nhra will allow pro stock racers to run any currently approved engine combination in any currently approved body, regardless of the manufacturer, during the 2018 nhra mello yello drag racing series season. New billet 4valve cylinder head approved for suzuki nhra. Refer to the current nhra rulebook or nhra rule amendments for vehiclerider requirements, specifications, and general regulations. Navigating the nhra pro stock motorcycle series with vance. The engine must match the body make and all motorcycles must pass a nhra body inspection before being allowed to compete.
New billet 4valve cylinder head approved for suzuki nhra pro. Below lie the complete set of rules for pro stock eliminator in the year 1974. Nhra changes pro stock engine rules racepages digital. Apr 08, 2015 engine requirements are pretty simple. For 20, harleydavidson and buell will both be allowed a maximum 160cubic inch displacement cid, in a 60degree, twovalve, push rod engine. Refer to the current nhra rulebook or nhra rule amendments for. Nhra to allow any accepted enginebody combination in pro. We brought in about 15 new teams and ended up selling 60 of those pro stock engines worldwide.
The nhra nostalgia supplement provides guidelines and minimum standards for the. The four professional categories are top fuel, funny car, pro stock. Early 500inch pro stock engines using the old bow tie block had a bore around 4. Pro stock motorcycle is the twowheel category in the nhra. Victory in nhra pro stock motorcycle page 3 victory. The nhra pro stock motorcycle season opener may have been postponed but for rider marc ingwersen the exitement is still off the charts. Nhra engine blueprint specifications blueprint specifications contain information vital to building nhra legal stock and super stock engines. When engine explosions occur primarily in the nitromethaneburning top fuel and funny car classes it takes the vaunted safety safari extended time to. The nhra attempted to balance the playing field for 1972 and introduced rules allowing for small. For more on the first nhra pro stock championship engine, check out this enginelabs story. Nhra announces 2019 nhra pro stock schedule dragzine.
According to the nhra pro stock motorcycle rules, the bikes will have differing weights depending on engine combination. The national hot rod association pro stock class emerged from the productionbased super stock in 1970 with a more liberal set of rules and an absence of handicaps. Jun 05, 2009 i had the opportunity to spend the day with mike berry and his crew while they qualified and competed in the gator nations in gainesville, florida. New billet 4valve cylinder head approved for suzuki nhra pro stock motorcycle competition october 9, 2019 anne proffit drag racing, news, nhra, racing 0 even as the few riders in nhra s mello yello drag racing series pro stock motorcycle class have used an outdated suzuki engine case from the late 1970s, suzuki hasnt shown much. Nhra pro stock engines are restricted to a maximum 500 cu in 8. On wednesday, nhra announced changes to the pro stock motorcycle class for the remainder of this season and next year. Competitors rely on spec racing gasoline to produce elapsed. By matt polito the turmoil in the pro stock motorcycle class has subsided from nearfrenzy earlier in the year as the nhra struggles to maintain parity between the now four different brands of motorcycle regularly competing. Pro modifieds can either be raced on 14 mile or 18 mile tracks. Ihra vs nhra pro stock motorcycle pro bike racers battle at australia winternationals duration.
No busas are running pro stock motorcycle,and all of the suzukis are forced to run old gs cases and heads and limited to 1700 ccs whereas the so called buells and hdsneither actually containing any parts made by either buell or hdare allowed over 2600 ccs160 cubic inches compared to 107 for suzukis. Rules initially favored big block v8s with chrysler hemi engine powered cars winning the world title the first two years. Classbyclass regulations and requirements, racing procedures, and. Top fuel dragster engines must follow strict guidelines set by the nhra governing body when competing in championship drag racing events in the united states and canada. I look back and now that pro stock motorcycle is go go go. Critical dimensions, as well as casting numbers for cylinder heads, intake manifolds, etc. April 2426 ngk spark plugs nhra fourwide nationals, charlotte, n. For 20, harleydavidson and buell will both be allowed a maximum 160cubic inch displacement cid, for a 60degree, twovalve, pushrod engine.
How much horse power does nhra pro stock motorcycle have. Along with his jmi racing pro stock motorcycle team, the squad will introduce fmt, inc. Class eligibility is based on various requirements and specifications, including type of vehicle, engine size, vehicle weight, allowable modifications, and aerodynamics. Meanwhile, those who are complaining arent putting in the work necessary to successfully compete. Basic nhra safety rules all cars must meet nhra rules and pass technical inspection this is general information only and you should always refer to the current official nhra rule book. The 2020 nhra rulebook is now online and viewable by all who wish to compete in the nhra arena. Some classes allow two 4 barrels, some a single 4 barrel. This isnt an issue for the suzukisthe schumacher bikes and most others use factory suzuki cases. Three engines compete in national hot rod association nhra pro stock motorcycle psm. The engine is built around vintage suzuki gs1150 cases actual. Up to that point, suzuki pro stockers had twovalvepercylinder engines based on the gs. If youre entering a car, youve got to have a single automobile engine. This division has specific rules about engines, components, bodies, etc.
Minimum weight for both motorcycles will be set at 625 pounds. Nhra spent countless hours speaking with the engine builders and manufacturers as well as the race teams to come up with the final engine specifications for 20, said glen gray, vice president of. Probably the biggest selling point was when a startup team had their new engine purchase shipped. New nhra pro stock motorcycle rules march 12, 2007 at the conclusion of the 2006 pro stock motorcycle season, the nhra made changes to the psm rules that promise to change the face of the class as significantly as the 2002 rule changes that allowed purposebuilt vtwin engines to compete.
Motorcycles can only have a single motorcycle engine. Winner of six pro stock world championships, the professor was also the first to exceed 180 mph, 190 mph, and 200 mph in an nhra legal pro stocker. Nhra adjusts pro stock bike engine rules speed sport. National hot rod association masthead remove all of page iii page iii 1092019 introduction. Must be stocktype engine specifically designed and manufactured for. Categories or other exhibition nostalgia classes for example, nostalgia super stock that are not in this nostalgia supplement will be governed by section 4a super pro, pro, sportsman and section 4b advanced e. Usually, the nhra races pro mod cars on the 14 mile, resulting in high 5 to low 6 second passes, while the pdra races strictly on 18 mile track setups, allowing for high 3 secondto low 4 second passes. Bikes must be 1998 or later models and retain their stock appearance, including a front fender, simulated headlight and taillight, and manufacturer identification on both sides. To those who follow nhra pro stock, warren johnson needs no introduction. Must be stock type engine specifically designed and manufactured for production motorcycle use. After the season opener at the 50th amalie motor oil gatornationals in gainesville, florida. Dec 05, 2017 the pro stock class in nhra has been subject to many changes and resulting drama over the past couple of years. Building a vtwin prostock engine dc vtwin replacement.
When it comes to rules in racing, theres both the letter and the spirit of a new rule. While the suzuki engine is an unsupported antique in this. Not long ago nhra pro stock motorcycle racing was living on borrowed time. It has been a feature of nhra drag racing since the 1980s when it was added to the professional class structure and has since spread around the globe. Run in conjunction with the lucas oil drag racing series program. Apr 03, 2019 the nhra stands behind its claim to create parity within the pro stock motorcycle class but they continue to punish those teams that are working feverishly to improve. Jan 21, 2014 up to that point, suzuki pro stockers had twovalvepercylinder engines based on the gs. Your cars engine must be equipped with a harmonic dampenerbalancer that meets or exceeds sfi 18. Nhra announces 2020 mountain motor pro stock schedule. The nhra stands behind its claim to create parity within the pro stock motorcycle class but they continue to punish those teams that are working feverishly to improve. He was named as one of nhra s top 50 best drivers, and is a member of the international motorsports hall of fame. Nhra issues tech rules to bring parity to three classes.
Nationals steve johnson clearly beats matt smith for the win in pro stock motorcycle but the nhra overturns the timing and scoring decision 2 days later. Jan 18, 2007 kawasaki is back, teamed up with rob muzzy to compete in nhra prostock with a zx14 based bike. The reason there are these rules and changes is to make more than one brand competitive. Racers wanting a pro tree must have a p before their dialin. Safety regulations for nhra classes and brackets racingjunk. Kaw back in nhra prostock kzrider forum kzrider, kz, z1. Hot rod engine tech inside warren johnsons pro stock. We think the new schedule will increase participation by relieving the economic burden and time commitment that comes with 24 events, which. Matt smith makes the fastest pro stock motorcycle run in. Nhra announced changes to the pro stock motorcycle category. Street cars the following items are required for a vehicle and driver to pass tech. All motorcycles must pass nhra body inspection prior to competition. The biggest effect with change from carburetors to electronic fuel injection is not the efi, says robin lawrence, efi sales manager for holleythe company that will supply mandated fuelsystem. Oct 09, 2019 new billet 4valve cylinder head approved for suzuki nhra pro stock motorcycle competition october 9, 2019 anne proffit drag racing, news, nhra, racing 0 even as the few riders in nhras mello yello drag racing series pro stock motorcycle class have used an outdated suzuki engine case from the late 1970s, suzuki hasnt shown much.
First, hood scoops were gone, then carburetors were gone. In a historymaking decision made at the request of the teams, nhra will allow pro stock racers to run any currently approved engine combination in any currently approved body, regardless of the. The late dave schultz is the alltime leader in pro stock motorcycle victories with 45. Nhra pro stock rules specifically state that the engine must be designed and manufactured for a production motorcycle. These highly modified vehicles, which can run under 6.
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