Dec 6,2023 with rule update and addendum for starts and re starts
Southern Ontario Modified Association
Pro 4 Class
*Memberships: $150.00 Per car. Only paid members cars are allowed entry into sanctioned races. Being a member says you will abide by rules that are in existence.
CHASSIS
Front engine rear wheel drive, rear/mid-engine rear wheel drive
Four bolt wheel pattern only 4” ,4 ¼” or 4 ½”
Wheel base minimum 87 inches – maximum 102 inches.
Track width: 82” ish. To outside of tire bulge
Minimum Weight 1700 lbs. and not to exceed 2000 lbs.
ROLL CAGE
1 1/2″ x .095″ min., three driver’s side bars min.
FRONT SUSPENSION
Dual arm independent suspension only. One coil over per wheel.
No remote adjustable suspension
REAR SUSPENSION
One straight axle only on front engine rear wheel drive car.
Rear engine cars allowed independent rear suspension.
One coil over per wheel.
BODY
Open front wheels completely exposed.
Lexan .125″ min. full windshields in front of driver mandatory. Definition must cover from above eyes to below chin.
Roof optional.
Maximum body width 82″
Centre of front wheels to nose max. 40″
Centre of back wheels to back max. 40″, not including spoiler
Nose piece and front bumper no wider than inside of front tires.
Nerf bars or body must be within 1″ of outside of tire.
Numbers must be neat and clear on both sides of car.
Bumper high must be between 13″ and 15″ with centre being 14″
*Body and car should arrive at track looking presentable.
ENGINE OPTIONS
16 Valve SOHC and DOHC 4-cylinder engine under 2500cc
Short block, Stock and unaltered.
Crank, rods, piston assembly to be run as delivered from the factory. No lightening or balancing.
Oiling system may be modified for circle track racing (pan, pickup tube, remote filter, oil cooler).
No dry sump oil systems.
Water pump impeller may be replaced opposite direction vane.
Cylinder head, stock valves no oversized valves, no stainless or titanium valves.
Stock springs, retainers and buckets only.
Any drop -in cam allowed.
Head porting allowed.
Milling of the cylinder head allowed.
Adjustable cam gears may be used to fine tune cam timing.
Cylinder head may not be relieved for lobe tip clearance.
2-barrel Holley carburetor or twin side draft carbs allowed
Must have air filter.
Any intake manifold.
Fuel injection allowed. Any ECM. Stock intake no porting, stock throttle plate. No aftermarket EFI intakes. Cold air tube with cone filter allowed.
No turbo, no supercharger or NOS.
Any Ignition system allowed.
Maximum engine setback for front engine rear wheel drive, maximum 20″ from centre of front wheels to front of engine block.
Honda S2000 2 litre and 2.2 litre engine rules
The objectives of the Honda S2000 engine is to create a reliable, competitive and cost-effective alternative (not replace) to the current all-out race engine. The engine must be totally stock with no Modifications. All components of the engine must remain in stock form.
Block, crank, rods, and piston assembly must be run as delivered by the factor in stock form. Absolutely no modifications or aftermarket parts allowed.
Stock oil system to be maintained and not Modified
Cylinder head, stock valves only no oversized valves, no stainless or titanium valves. Stock springs, retainers and buckets only.
Stock Cam from the factory is only cam that can be used. One will be provided for tech inspections to ensure that it is stock
Two-barrel Holley carburetor
Fuel Injection, or twin side draft allowed.
No turbo, supercharger or NOS.
Maximum engine setback for front engine rear wheel drive, maximum 20″ from centre of front wheels to front of engine block.
*8 VALVE ENGINE
Any 4-cylinder, single cam, 8 valve engine up to 2400 cc.
The only Aluminum heads allowed for the Ford 2.3 engine is the Esslinger or stock.
Any production/Fuel injection intake allowed.
No Dry sump oil system.
Two-barrel carburetor, gasoline and natural aspiration only. No fuel injection, turbo, supercharger or NOS.
V6 Engine specifications
Engine must be a stock Chevrolet V6 with a displacement of 2.8L or 3.4 L
2.8 engine can be bored enough to resurface cylinders and rebuilt using stock parts with a 9:1 compression ratio like those found in a 3.4L. No altering of any parts allowed.
1 500 cfm Holley 2-barrel carb allowed.
2.8L can use 3.4 cam.
Aftermarket oil pans allowed. Wet sump only.
Must run 6AL MSD box with 6000 chips. Must run stock electronic distributor no crank trigger.
Heads; Steel heads only.
Clutch: Stock steel flywheel and stock steel clutch
Grandfathered 4.3 5600 rpm til beginning of 2025 season
*ENGINE RPM rules 2.3 ford bore up to 60 over 7600 rpm
2.3 over 60+ up to 2.6 over 60+/ stock or stroked 7300
Honda 9000 rpm
V6 gm 2.8 3.4 6000 rpm 4.3 5600
*Driver must prove rpm to get position, points and payout for feature by MSD box setting, Rev chip or tel tale tach for all drivers. Show one of tech officials at end of each of the 8 feature races.
It is the obligation of the car owner or driver to prove to engine size (by bore and stroke) before beginning of race season to be race eligible for 2024. New members during season also must prove size before first race.
FUEL
Race fuel allowed. No methanol allowed.
TRANSMISSION
Manual Transmission with minimum 1 forward gear and reverse gear.
TIRES
American Racer 10″ tire. Hoosier F-15, F-25, F-35 tires and Cobra tires
*If rear trans axle is used rim and tire sizes are fully open for rear ratio compensation, tire compound must match American Racing tires now in existence.
RIMS
13″ x 10″ steel racing rims only.* For trans axle cars rim diameter as required but 10” width max . 4 Bolt rims only 4”, 4 ¼” or 4 ½”
ONE WAY RADIO
One way radio mandatory .454 uhf
TRANSPONDER
Transponder mandatory Mounted 18″ or more from centre of rear axle tube. Westhold transponders available at the track for rent or purchase
BRAKES
4-wheel brakes required.
Any single or dual master cylinders allowed.
Brake bias valve allowed
No brake ducts.
Front disc brakes, rear disc or drum brakes.
No titanium, carbon fibre, electronic traction control or antilock brake
SAFETY
Approved 5-point harness with 2″ belts min., no more than 10 years old from date of manufacturing. Must be replaced if weathered or frayed at any age.
Snell approved helmet. SA2010 minimum rating.
Approved fire suit and gloves.
Approved arm restraint mandatory for open roof cars.
Quick release steering wheel mandatory.
Battery on/off mounted within driver’s reach.
Drive shaft loop on drive shaft mandatory.
Aluminum race seats only.
Approved racing fuel cells only.
Scatter shield mandatory must provide 180 degrees of protection 1/8” steel min.. or 3/16 aluminum. Not required on cars with Ram Coupler. Scatter Blanket accepted.
Cotter pins or lock nuts on all steering components.
All sheet metal fastened by pop rivets, duzus fasteners or bolts and nuts. (Not screws)
Proper padding to cage where helmet can contact, sharp edges eliminated.
Bright reflective tape on back of all car’s min 24”
Bunge cords, Zip ties, duct tape not allowed as only means of hold car together…..fix it properly or park it! Quick fix not considered race ready!
2 throttle return springs mandatory. 2 added to any stock carb springs.
Head and Neck restraints recommended.
Open alcohol NOT allowed in pits til our feature race is complete, the
driver of car associated with the person or persons breaking this rule will lose their points and payout for that evening.
*All cars will get a safety inspection by our technical rep prior to race season and tagged and dated for car to be eligible to race in 2024.
The ultimate responsibility for liability and the safety of each race car, is its driver. All equipment associated with that car and driver is the completely and solely the responsibility of the driver/owner of that car.
Expectations: Showing up at track with a prepared car.
Show your professionalism, Good looking tidy equipment, Watch your language, ladies and young adults present. Our members have and are working hard to create an image that track owners, officials and spectators WANT to have at their track…be respectful to your fellow competitors.
Equalization and Eligibility rules 2024 season
Our goal is to put everyone on equal racing field, we need participation from all racers to help us get to that goal, track owners want competitive races for their fans and we want cars mostly in the same lap and we need to try to get to that goal fairly for everyone. If your car wins 2 consecutive features by (distance from start /finish line to corner 4 starting cone) than second place car you will lower your rev limiter by 100 rpm’s of your max rpm of the second race that you won even if you are within your engines rpm rule. That new setting will be confirmed by tech inspector and recorded. RPMs, weighting of car and or engine restrictor plate could be the next speed adjustment if required.
You must attend and drive your car at a minimum of 2 test and tune days at Flamboro or track we are associated with before racing any of our sanctioned races. Also, on race night you must participate in at least one practice to be eligible to race that night. (One buy night)
Your car must have safety tag, you must have all personal safety equipment required, engine proof, tel- tale tach or proper rpm chip for your application, member fee paid and registration paid.
Race Pre registration for 2024, 8 races at $40.00 each $320 paid before April 1st 2024, (payment plan can be set up) if you attend the race, you get your $40.00 back or gate fee paid, if you miss the race the $40 is forfeited. If you do not pre register it will cost you $100 dollars to race, plus you pay track entrance fees. (the $100 is not paid back in any way.)
If a race is sponsored,
in order to get sponsored extra payouts car must have sponsors advertising displayed respectfully on your car.
POINTS
HEATS; Winner 6 points
2nd to 18th 3 points
DNF 1 point
FEATURE; Winner 24 points 10th 9 points
2nd 18 11th 8
3rd 16 12th 7
4th 15 13th 6
5th 14 14th 5
6th 13 15th 4
7th 12 16th 3
8th 11 17th 2
9th 10 18th 1
PENALTIES
RPM overage — Zero points for event and payout for last position.
Aggressive driving determined by flagman or club safety officials— loss of 5 positions of that race and paid accordingly. Can also revoke the right to drive with our organization.
LINE UP RULES
HEAT LINE UP; DRAW POSITION, new drivers, rookies (rookies determined by finished races not 1st year racing as we only have 8 race nights) back of line up, any driver can request back of pack.
FEATURE LINE UP; First Night Heat finish, top same lap drivers reverse order, followed by balance of cars in finish order.
ALL OTHER FEATURE NIGHTS; All cars on lead lap of previous feature race reverse position, following cars that are one lap down line up in finish order. If you finished 2 laps down in the previous feature race you are not automatically in this nights feature but you can earn a back position by finishing no lower than one lap down in heat race of event you are attending. PLUS {Everyone will get one free gimme to the feature per year} * Eight cars will always be in the feature !
Race Starts and Restarts;
Race starts all cars are in 2 rows side by side, after tire warm ups are done, when we are given the 1 lap to go (no scrubbing tires) all cars tighten up behind the front row cars, when the pace truck pulls off, the same speed resumes til the 2 front cars reach the orange cone in turn 4 , if they are side by side and the flag man waves the green flag the race is on, but if one driver jumps the start, that driver goes to the very back of pack, and the row that driver was in moves up to the front for the start. When the start is good no passing can happen til you cross the start finish line unless the car in front of you has a problem or asleep.
Restarts; In the event of a restart (after lap 1) top 3 drivers are single file (not staggered) single file in a row, balance of drivers are 2 side by side and tighten up on the 1 lap to go signal, when the pace truck pulls off the leader holds the pace truck speed til turn 4 orange cone, all top 3 cars must be in position, not staggered, green flag waves, no car can pass til past orange cone. (any one that jumps goes to very back of the pack) all other cars move up that one position.
EXITING RACE TRACK: Only when track is under caution! That is for practice, heats or Race. All other times go to infield and wait for caution or end of race.
Clarification of any of these rules or information please contact; Ken Mercer by ph. or text at 1 519 755 5803 email: kenmercer55@gmail.com
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