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IMPBA racers there is hope. I am bringing a proposal before the board at the Evansville Nitro Nats meeting this Thursday, that would allow the interchange of parts within a manufacturer's outboards of the same size. Basically you could use any OS .21 outboard part on any OS .21 outboard, or any K&B .21 outboard part on any K&B .21 outboard, or any Thunder Tiger .21 outboard part on any Thunder Tiger .21 outboard. The proposal would also allow altering the factory finish such as polishing, painting or removing the factory finish
 
Bob,

This is awesome. Now are you talking about external only or does this apply to internal as well, in other words, do all of the internal parts have to be of the same manufacturer for that particular engine as well? Thanks.
 
krpnova said:
IMPBA racers there is hope. I am bringing a proposal before the board at the Evansville Nitro Nats meeting this Thursday, that would allow the interchange of parts within a manufacturer's outboards of the same size. Basically you could use any OS .21 outboard part on any OS .21 outboard, or any K&B .21 outboard part on any K&B .21 outboard, or any Thunder Tiger .21 outboard part on any Thunder Tiger .21 outboard. The proposal would also allow altering the factory finish such as polishing, painting or removing the factory finish
Click to expand...
Bob, this is something that has been needed in this sport for years. This will finally put an end to needless disqualifications over petty stock/sport class part infractions. For those who want the rules to be simple, here is your chance to finally have it. It won't get any more simple than that. No more engine series gurus needed at races to end disputes. All the race CD's should love this one. I am in favor of this 100%

-Carl
 
krpnova said:
IMPBA racers there is hope. I am bringing a proposal before the board at the Evansville Nitro Nats meeting this Thursday, that would allow the interchange of parts within a manufacturer's outboards of the same size. Basically you could use any OS .21 outboard part on any OS .21 outboard, or any K&B .21 outboard part on any K&B .21 outboard, or any Thunder Tiger .21 outboard part on any Thunder Tiger .21 outboard. The proposal would also allow altering the factory finish such as polishing, painting or removing the factory finish
Click to expand...
Great idea and a needed one IMHO - sure clears the air and removes petty disputes .

RonShaw said:
Bob,

This is awesome. Now are you talking about external only or does this apply to internal as well, in other words, do all of the internal parts have to be of the same manufacturer for that particular engine as well? Thanks.
Click to expand...
Ron , its just my thought and I would hope others chime in, but I for one say like parts in like motors and have at it.

You must be up to something
default_tongue.png
And yes I plan on also joining IMPBA / voting- and attending a few races in that org.
default_wink.png
 
Andy,

You see all the time sleeve and piston sets offered that have been "turned down" to fit the OS. It's clearly already being done. I was just curious about Bob's thoughts on this and was it part of his proposal or external parts only.
 
Jim Dorcy said:
Could also be that you guys are going much faster ? . I have nothing to compare to apart from the Stalker Pro. My best speeds have been in the

56 - 57 mph range with the boat on the looser side and 54 - 55 mph locked down
Click to expand...
If thats the case you would have one of the fastest SPORT OB tunnels I have ever seen.
 
RonShaw said:
Bob,

This is awesome. Now are you talking about external only or does this apply to internal as well, in other words, do all of the internal parts have to be of the same manufacturer for that particular engine as well? Thanks.
Click to expand...
Good point Ron. Will the "If you can't see it, it's okay to do it" rule still stand for internal parts?

Since people are already doing what they want inside the so called "sport" class engines (of course short of bumping up the displacement) we know nobody out there is doing that. I would think that the internal part of the rule could be left as is. It's the external parts that are causing the disputes and disqualifications that CD's are faced with. CD's already have their plates overflowing just putting on the race. I would be in favor of leaving that ( the internal part) as it is if we are going to streamline the rules and keep them simple and let the "No tuned pipe" "like manufactured external parts" and "Total cc" control the class. JMO

-Carl
 
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RonShaw said:
Andy,

You see all the time sleeve and piston sets offered that have been "turned down" to fit the OS. It's clearly already being done. I was just curious about Bob's thoughts on this and was it part of his proposal or external parts only.
Click to expand...
Asking to gain the knowledge only Ron, are those like parts of the same manufacture from different products being modified or crossing over manufactures parts ?
 
Carl Van Houten said:
RonShaw said:
Bob,

This is awesome. Now are you talking about external only or does this apply to internal as well, in other words, do all of the internal parts have to be of the same manufacturer for that particular engine as well? Thanks.
Click to expand...
Good point Ron. Will the "If you can't see it, it's okay to do it" rule still stand for internal parts?
Since people are already doing what they want inside the so called "sport" class engines (of course short of bumping up the displacement) we know nobody out there is doing that. I would think that the internal part of the rule could be left as is. It's the external parts that are causing the disputes and disqualifications that CD's are faced with. CD's already have their plates overflowing just putting on the race. I would be in favor of leaving that as it is if we are going to streamline the rules and keep them simple and let the "No tuned pipe" "like manufactured parts" and "Total cc" control the class.
Click to expand...
I agree Carl. Keep it simple...
default_smile.png
 
Andy Greene said:
RonShaw said:
Andy,

You see all the time sleeve and piston sets offered that have been "turned down" to fit the OS. It's clearly already being done. I was just curious about Bob's thoughts on this and was it part of his proposal or external parts only.
Click to expand...
Asking to gain the knowledge only Ron, are those like parts of the same manufacture from different products being modified or crossing over manufactures parts ?
Click to expand...
Bob stated "OS 21 outboard" so that should answer your question.
Look here:

http://www.intlwaters.com/index.php?showtopic=60844
 
Last edited by a moderator:
The rules are very vague on B tunnel. There are no rules in sport tunnel that limit the modifications inside the case (piston sleeve or timing "intake or exhaust") only EXTERNAL and no pipes or carb/muffler mods. My question is simple since I have been absent from the IMPBA.

lets say Marquette the flyer says B, D, O/B Tunnel. That's all it says. So in my mind, it don't say sport, mod or open O/B Tunnel, so I would bring my modified tunnel? modified motor and a pipe/Correct? B Tunnel right?

or the Fifteenth Jack Kohlmeyer Classic it says, B sport, B modified, open nitro tunnel so I know I can not run my mod tunnel in the sport class. But I can run it in the mod and open classes? Right?

if someone can explain to me so I do not bring the wrong boat to a race but B tunnel meant bring what you got. LOL Thanks!
 
Last edited by a moderator:
Kevin,

If the entry form says B Tunnel, any b mod or b sport tunnel can be entered. If it says B Sport, it has to be a b sport tunnel only that meets the current IMPBA b sport tunnel rules. And yes, the b mod can run in the open class.
 
Last edited by a moderator:
Kevin Burns said:
The rules are very vague on B tunnel. There are no rules in sport tunnel that limit the modifications inside the case (piston sleeve or timing "intake or exhaust") only EXTERNAL and no pipes or carb/muffler mods. My question is simple since I have been absent from the IMPBA.

lets say Marquette the flyer says B, D, O/B Tunnel. That's all it says. So in my mind, it don't say sport, mod or open O/B Tunnel, so I would bring my modified tunnel? modified motor and a pipe/Correct? B Tunnel right?

or the Fifteenth Jack Kohlmeyer Classic it says, B sport, B modified, open nitro tunnel so I know I can not run my mod tunnel in the sport class. But I can run it in the mod and open classes? Right?

if someone can explain to me so I do not bring the wrong boat to a race but B tunnel meant bring what you got. LOL Thanks!
Click to expand...
IMHO thats a huge part of the problem AND a deterrent to new racers - A clear cut set of rules that overlapped both orgs makes even more sense.

Make it EASY for someone to step in and race , be it IMPBA or NAMBA and the rules for these classes equal each other in order to allow a racers to have a clear cut picture of whats required to run in BOTH orgs with one boat.
 
The B Tunnel rules in IMPBA are not at all vague. You can run ANY engine, any lower, any pipe (or none if desired) any carb, etc., as long as it meets the engine limit of the class. That is essentially it, not vague or hard to understand. The B Tunnel class used to be known as the 20 Mod tunnel class.

There have been literally no issues in many years over a B Tunnel in a race. Not true with the Sport B (used to be called the B Stock) class. I asked Bob Kensill, IMPBA National OB Director, after the Tunnel Masters last month, to get a rules proposal to clean up the issues and holes in the present rules. Glad to see it happening. Sure would make my life at races much easier.
 

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