Tach Race 2015 Final Wrap-Up

Sounds perfect as long as you are OK with it Kim - I know the APC's are harder on the fingers.

Mark Boesen wrote:

pkrankow wrote:Baby bee proposal:

5cc stock fuel tank (darn, my baby stunt bees are eliminated now, I bored the venturis out on both.  Most of my non-stunt baby tanks are probably out for the same reason)
unported back plate

A go/nogo gauge should be able to verify this within reason unless screened.

Crank to case fit, and piston to cylinder fit are allowed to be adjusted within reason.  Head and head shims may be selected within reason.  A brass bushed case would be outside the spirit of the competition, although technically allowable as adjusting the fit of the case.

Phil

Stock means stock, The way it was made at the factory? I think that's the best way to look at it...was it built with a cylinder shim or a brass bushing?

These things came from the factory in many different configurations, as STOCK. Different cylinders, different pistons, different cases, different heads, different reeds, different tanks, different back plates... The easiest level field to get is intake diameters, and no modifications to the cylinder and piston, whatever cylinder it is. So what IS stock on an engine that over the decades it is made had changes cycled into production without a break?

In part this is to come up with a class that can be judged. Popping the head and inspecting for grinding, measuring the venturi and back plate diameters, sure. These could be measured easily. Tearing each and every engine down to judge would be insane!

A cylinder shim would be no. That is adjusting the engine timing. Similarly a shaved case or piston would be out.

A brass bushed case on the crank is generally reconditioned to as close to stock as reasonable, and would require pulling the crank out the verify this or not. I think it would be outside the spirit of the competition but not easily verified. If the case was restored to original tolerances then it should be fine and not run significantly different from the anodized aluminum.

This limits the adjustments to the engine to polishing the crank, adjusting the compression via head shim count, and running the engine in prior to sending it.

Phil

Hi Rod, Everybody,

I didn't realize the current Babe Bee with the "twin slit" exhaust is a dual intake port engine, I'd think that would be a considerable advantage over a single port engine.

So now what, do we allow a dual port "slit" type cylinders like the current Babe Bees and allow retro fitting of these newer cylinders to older Babe Bee & Golden Bee engines?

Or, stay with the older open exhaust single ports only Babe Bee/Golden Bee?

Or, maybe just go with late model Sure Starts with the grey snorkel back plate?

The idea was to use the most common engine out there with no modifications, but it seems there's no easy answers.

Remember, the later slit exhaust cylinders may be duel bypass, but they don't have SPI, which can make a huge difference to power.  There would need to be comparisons done, but I don't know how much advantage the later cylinders would be.
I guess you've chosen Babe Bee to avoid the problem of people sending in a "stock" Black Widow, or even a Killer Bee or Venom, but my original thoughts about a stock class weren't to limit it to one type of engine only.  It was just a way to allow people to be involved when they weren't into hot-rodding engines for all-out speed.  Maybe some folks have a couple of nice running engines but aren't mechanically minded and just want to know what they'll do in a controlled test.  It's not about winning but just competing.   (Though winning is always nice, so I hear   ).

Rod.

Yeah, Mark and I are still working on it.

I really don't get it, if it not about winning and just getting a number in controlled test any engine can be entered in Mouse or unlimited.
No need to over think it.

If there's prizes, glory and fame involved, there's going to be competition.

I thought it would be good to include products sold by Bernie (Cox International) but, never had the need to use a "slit type" cylinder I wasn't really aware that they changed to dual ports when I suggested including them. I'm leaning toward a "Vintage Babe Bee" class (including Golden Bee) for open port, single cylinders only. The only modification/change is to allow any reed to be used.

I really like the idea of including single port Golden Bee's as well, very Nostalgic!

Cheers, Paul

A Men Mark!

Looks good Kim!

Thanks For the Hard Work Kim and Mark , got my print out . Eric

Shoot Kim,

Sorry for the reply delay. Looks good, I am very happy with the rules!

Thank you guys!

It's a considerable load off my mind just to have the rules posted, with what LOOKS like pretty clear terms.

I am normally pretty good at record-keeping and such, but for whatever reason the Tach Race seems to suffer a bit.

I finally found some clarification (THANK YOU PAUL !!!) of the Mouse Class Rules that may help guys like me who MUST have things in layman terms.

This is from Paul Gibeault, and it greatly helped me get a working understanding of the Mouse Class:


AMA Class Mouse Racing 101:

The engine part is really simple.  There are ONLY three criteria.

1.  The engine maximum displacement must not be larger than .0504 cubic inches.

2. The engine MUST use a reed valve.  (This means that 99% of competitors use a Cox product [All...in our Tach Race's case] and the other 1% machine or make their own type of reed induction system)
***The Cox RR-1 Rear Disc induction engine is therefore not allowed.

3.  The engine MUST draw it's fuel from an attached, integral tank.  (This means that 99% of competitors use a Cox Black Widow tanks, and the other 1% machine or make their own integral tank.  Separate tanks are not allowed.

Engine modifications are unlimited.  You can grind away, chrome plate, port, polish, & modify to your heart's content.

And that's IT!  How much simpler can it get?


Thank you again, Paul !

Hi Kim & Mark,

Everything looks quite fine. Good job!

" GENTLEMEN, PREPARE (for Kim) TO START YOUR ENGINES!! "

Cheers, Paul

Guys!  

Kruzn Dave has offered to sponsor the fuel for this year's Tach Race, and I've accepted.

I'll be receiving 25% and 35% Cox Super Fuel (reformulated with castor) for the race in January.  Several tests of the new formula have been run by C.E.F. members, with no adverse effects on their engines, so I think it's only proper to take Dave up on his generous offer.  

This will be known-fresh fuel for the race, so we ought to have numbers we never saw before !!

Hope this is acceptable to everyone, and kudos to the positive attitude of Dave and Hobbico for giving us another source of good fuel !

Kim

Thanks for the fuel Dave. Any chance this stuff might get marketed in Australia?

Just a Reminder/Bump...

Hey Guys,

If possible, I'd like to get a general idea of the number of entries in each class for Tach Race 2015. I'm also working with Bernie and Matt, and need to give them an idea of this year's participation so we can get an idea of the break-down of prizes.

Thanks

I'm good for at least one, Kim.
Probably unlimited.
Bob

I'll be sending an Unlimited and possibly a Mouse-1.

Kinda torn.

I have been biting off more than I can chew lately.

Sign me up for unlimited bee and TD. If I can do another then I will let you know.

Ron

I'm in for unlimited, mouse, Tee Dee and stock stocker babe bee.