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March 2004 - Newsletter

2004 Results
News Letter -  New Records -  Points -  Event Pictures -  Run Log
East Coast Timing Association
Newsletter

Volume 11, Number 1     March 2004
ECTA, 11241 Barnes Bridge Rd.,
Laurinburg, NC 28352
910-266-9868

          Maxton “Monster Mile” March Madness

"Streamliner runs at ECTA bike meet”

          Calvin Smith brought out his newly redesigned streamliner out for some testing at Maxton. Only had one engine in it for testing purposes, but with a little tuning Jim Kintz was able to set top car speed of the meet at 188.0249 MPH.
          Gorgeous weather, warm, but not hot, a little Maxton HP on Saturday and just the opposite on Sunday, but all in all a great meet.
          Yates Racing made a nice easy pass at 186.409 MPH to gain the points lead over Koenig Bros Racing by 48 points.
          On the bike side of things some times he shares the ride some times he rides his own. This meet Rich Yancy’s rode his gorgeous
Suzuki to another absolute top speed of the meet at 237.354 MPH. The second fastest bike run was Don Smith at 218.563 MPH which gained him entry into the East Coast 200 MPH Club.
          Scott Guthrie Racing has the scooter points lead over OFOS Racing by the same margin as the car guys, 48 points.

Banquet

          The ‘03 Banquet was a great event this year thanks to Susan Miller who found us a new location, Scotch Meadows CC, and a new caterer, Rick’s catering. Bill Van Dykes songs were the hit of the evening along with Tonya and Keith Turk wedding cake and champagne after the meal.
          Congratulations to all who participated in the points chase, the champions and the top speeders.


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ECTA Schedule
April 24-25, May 29-30, June 26-27,
Sept 25-26, October 30-31.

Tech Corner
by Joe Timney

Box vs. Round Tubing

          There is generally no advantage to a box frame car. Most people think that this design is stronger, when in fact the strength of any racecar comes mainly from the roll cage being properly tied-into the chassis. The secrets are the triangular tubing layout, and properly installed gussets. A standard door car cage with engine bay bars and ‘x’ bars from the top of the cage back to the upper rear shock area will more than double the chassis stiffness. I must admit that an inexperienced first time builder may be uncomfortable with a round tube project but with all of the tube notching equipment available, it is not the problem it once was. Another advantage to a round tube car is that it sits lower to the ground, due to the fact that the frame isn’t as tall. One more plus for a round tube car is the $130 you will save not buying the box tubing.
Mild Steel vs. 4130 Material

          There is a myth that a chassis constructed of 4130-chrome molly is “stronger” than mild steel one. While 4130 is a stronger material, the rules allow us to use a thinner wall thickness (.083 8 .065). Therefore, the 4130 structure will be 25 to 30% lighter than mild steel. This may or may not be a consideration in your planning. Other factors to consider are the cost (about $900 more for 4130) and ease of construction. A mild steel chassis can be MIG welded (Metal Inert Gas) while the 4130 tubing requires the TIG method (Tungsten Inert ~Gas) and must be done by a professional.

Mild Steel Wall Thickness

Although the rulebook only requires .120” wall tubing thickness in a mild steel application, it would be wise to use .134 (11 ga.). You must be aware that .120 wall tubing can vary by production runs and can be within acceptable industry mill spec standards yet being under the minimum .120 nominal wall thickness! Since NHRA has instituted the .118 minimum, I have had to repair many “new” cars as thin as .113!
          When ordering tubing from a steel supplier, specify ASTM A51 3 Type 5, DOM (Drawn-Over-Mandrel). This material is a cold drawn electric resistance welded tube with all flash removed. Each tube is tested for soundness of weld. It is made from 1020 steel in walls up to 10 gauge and 1026 steel in walls heavier than 10 gauge. Normalizing and cold drawing over a mandrel makes DOM a uniform and precision Product. It is preferred over seamless tubing for it’s excellent O.D. & I.D. concentricity.
          Cold Drawn Seamless Tubing (ASTM A519) is another good choice but availability in .134 wall thickness is limited. It is made from 1026 steel, produced to OD & ID dimensions; and it is furnished in “As Drawn” condition. Cold Drawn Seamless offers good surface quality and increased mechanical properties over hot finished seamless tubing.


Future Topics

Tubing Notching Equipment

Tube Bending Equipment

Ouestions & Answers Column

Suggestions

RULE BOOK ADDENDUMS

OPERATING PROCEDURES -
ADDENDUM 6, March 27, 2004
I-14 DRIVERS LICENSING:
page 10

Categories:
AA250 to 275 MPH
A+225 to 249 MPH
A200 to 224 MPH

MOTORCYCLE RULES — ADDENDUM
EFFECTIVE MARCH 27, 2004

VI-2 GENERAL EQUIPMENT STANDARDS FOR SPEED TRIALS:

I) TIRE REQUIREMENTS:


Tire speed rating for ZR rated tires will temporarily be increased to 225mph, and if shaved per this article will be increased to 250mph. Every motorcycle exceeding 200mph is required to report to impound for technical re-inspection after each successful run, whether a record has been made or not.

Additional addendums are on the ECTA web page.