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http://opbra.ca/wp-content/uploads/2020 ... -FINAL.pdf

TRIPLES RULES DRAG

TRIPLES CLASS
RULESRULE 10 • TRIPLES CLASS
1. Age requirement 12 minimum. Special circumstances for 12-15 year old racers**** - Both parents must be at the
event site to sign minor participant waiver
2. Follow General/Competition Regulations - Drag classes and Safety
3. Approved boats are Flat, V bottom and Tunnel. Hydro or Outrigger hulls not
permitted
4. Post race minimum competition boat & driver weight 760 lbs (includes
boat/motor/propeller, running gear, driver, helmet, life jacket, etc.)
5. Motors:
a. 3-cylinder engine only to maximum 86 cubic inch. (Must have been a
production available engine prior to modifications, 60SST permitted)
b. No tiller style steering
c. Ignition timing computers, controllers or like, permitted
d. Any midsection and trim permitted
e. Gearcase must be shiftable from Drivers seat. F-N
f. Low water pickup, nose cone permitted
g. 24V systems permitted
h. Trim computers mandatory with 24V trim. (Must be outboard purposebuilt approved by Safety/Tech with 12V control circuit.)
i. Any Gasoline permitted (No Alcohol, Nitromethane, etc.)
j. No nitrous oxide systems or power adders
k. Class rules may change at any time to allow for equality and growth

T-750 OVAL
RULESRULE 10 • T-750
1. Age requirement 12 minimum. Special circumstances for 12-15 year old racers**** - Both parents must be at the
event site to sign minor participant waiver
2. Follow General/Competition Regulations - Oval classes and Safety
3. Approved Hull Type - Fiber Composite Construction V Bottom. Minimum
competition boat dimensions 12'8"L, 4'7"W, 1"3"D
4. Cable and Pulley steering recommended. Mechanical or Hydraulic systems
permitted.
5. Post race minimum weight 594 lbs (includes boat/motor/propeller, running gear,
driver, helmet, life jacket, etc.)
6. Motors:
a. Production Stock And Altered Stock 40 to 60 hp
b. 2 cylinder models up to 849cc
c. 3 cylinder models up to 849cc......I think this is a typo should read 750cc
d. Mercury 3 cylinder up to 49ci
e. Low emission and 4 stroke models are encouraged.
f. All motors limited to 160 psi compression
g. Rev Limiters may be raised or removed
h. Any combination or configuration of factory available parts.
i. Aftermarket parts must be direct replacement
j. Air intake may be modified, must retain stock carburetors
k. Minimum 15" midsection
l. Gearcase must be shiftable from drivers seat F-N-R
m. Nose cones permitted, NO low water pickups allowed
n. 24 V systems permitted
o. Power transom lifts /jack plates must be disabled
p. Pump gasoline up to 94 octane only, No fuel additives or Nitrous Systems
7. Class rules may change at any time to allow for equality and growth

T-850 OVAL
RULESRULE 10 • T-850
1. Age requirement 16 minimum.
2. Follow General/Competition Regulations - Oval classes and Safety
3. Approved Hull Type - Fiber Composite Construction V Bottom mono-hulls.
Minimum competition boat dimensions 12'8"L, 4'7"W, 1"3"D
4. Cable and Pulley steering recommended. Mechanical or Hydraulic systems
permitted.
5. Post race minimum weight 726 lbs (includes boat/motor/propeller, running gear,
driver, helmet, life jacket, etc.)
6. Motors:
a. Production Stock And Altered Stock 70 to 75 hp
b. 3 cylinder motors from 850cc to 1000cc
c. Low emission and 4 stroke models are encouraged.
d. All motors limited to 160 psi compression
e. Rev Limiters may be raised or removed
f. Any combination or configuration of factory available parts.
g. Aftermarket parts must be direct replacement
h. Air intake may be modified, must retain stock carburetors
i. Minimum 15" midsection
j. Gearcase must be shiftable from drivers seat F-N-R
k. Nose cones permitted, No low water pickups allowed
l. 24 V systems permitted
m. Power transom lifts /jack plates must be disabled
n. Pump gasoline up to 94 octane only, No fuel additives or Nitrous Systems
7. Class rules may change at any time to allow for equality and growth

I thought there would be some replies from current T racers.

The rules state that you can use stock parts from other motors, but, you cannot modify the stock part.
So you cannot port the fishing motor, but you could put SST60 sleeves in a fishing motor block.
You can run an SST60 tuner, but, you cannot modify a stock tuner.

This rule is interesting.
f/h. Any combination or configuration of factory available parts.
EXAMPLE: Now you can run the big carbs on the oval port.

I think what they wanted to say was:
Any combination or configuration of factory available parts FOR YOUR MODEL MOTOR.

One of the main problems racers have with rules is:
IF it doesn't say I can't do it, then I can!
Rules tell you what you can do. PERIOD.

T750 has increased the motor size to allow more motors into the class.

6. Motors:
a. Production Stock And Altered Stock 40 to 60 hp
b. 2 cylinder models up to 849cc
c. 3 cylinder models up to 849cc
d. Mercury 3 cylinder up to 49ci

849cc is 51.8 cubic inches
This allows the larger displacement 60 hp twins
The 6H2 yamaha
The early pre 1975 60 hp and the later small carb 60 hp OMC to 1988

Don, does this mean in T-750 you can modify the 2 cylinder OMC? Rule 6a. states Stock or altered 40-60 hp , 2 cyl.
Also, can we run the 49.7 cid , 3 cyl. OMC w/ 15" mid & Nitro case? When Frasier did that 4 years ago, he had to run the big gear case!

Thom, I was not involved with the rule changes. I can only suggest what I think a rule means.
I think OPBRA wants to go STOCK.
So you can only use STOCK parts that are available to everyone.
You cannot modify the stock part.
So your 2 cylinder powerhead would be stock as per the APBA spec sheet....that has not changed.
You would run a STOCK tuner
Because they say 60 hp..I think a 60 hp STOCK 49 is legal and it can run a big foot on a 15 inch....you would run small carbs.
The 60 hp 6H2 or the 50G model Yamaha can also run...you could not run the 70 hp CES head or CES tuner. The 50G is a short shaft with the [small [edit] gearcase.
You could not run a 650XS or any of its parts because it is RATED over 60 hp.

Think the 60 hp model.....what parts did it have.....the alteration is to run a 15 inch mid......you run the foot that came with YOUR model. You can use newer parts that came on later versions of that same model .....you can up grade your 40 with parts from the 60 provided the result is the stock 60....you cannot use parts off motors that are more than 60 hp.

THAT'S MY READ...OTHERS MAY READ THE RULES DIFFERENTLY

I WAS ASKED IF I THOUGHT THE NEW T750 RULES HURT THE CLASS.

On my first read.....YES!
Now after thinking about them.....NO.....I am starting to like them.

I like "STOCK".......I like "NOT MODIFIED".....I like having the same horsepower triples running because it helps the heavier drivers....I can see more "LAKE RUNNERS" coming out to race.

It I am reading the rules correctly.....they are simple.
If it is a part for your 60 hp.......its legal.

A triple nitro case is off a 75 hp......so it is not legal
A twin nitro case is legal but only on a twin.

How competitive is a 60 hp OMC triple with a big foot?
I think the twin 60 has the advantage.

How competitive is the 50G and 6H3 Yamaha triple?
VERY COMPETITIVE with the OMC twin.
It still has the big foot, but the motor has a bit more punch.
https://www.megazip.net/zapchasti-dlya- ... 50g-780659
Just noticed....the short shaft has the small gearcase!!

Why don't they allow the 52 cubic inch Mercury?
I think the reason is....it would dominate the class.....that motor comes with a small gearcase.
The other triples have to run the large gearcase.

do we know yet if 849cc 3cyl is a typo?

It is a error....should say 750cc. It will be corrected

Also Don we are allowing the oval port with the big carbs....first of all there are 2 boats out there already running that setup and are not running away with the podium. Right now we are trying to build the class so not to make anybody have to spend a lot if they are not legal to the TCORD rules. We did not carry all the TCORD rules so the oval port with big carbs was legal in 2019. We can get really technical when we have a lot of boats showing to every race...also it's getting harder for people to find parts to keep a MODEL INTACT. If somebody runs away with all the trophies we still have the FAIR COMPETITION rule to keep things in check. Thanks for taking time to study the reference guide! Are we gonna see you out at any races this year Don?

Craig, I can't commit 100%, but I hope to be at Gravenhurst . I do like the idea of running a 60 hp 49 OMC short shaft big foot in T750.
It's a throw back to the original FE class before 1975. The twin carb 49 mercury raced in that class as well. I am sure if someone shows up with one on a Delta you would let it run.