JesseW.
forum member
I want to start doing some TT's next year with the SEDIV SCCA as they do a lot of events within a reasonable driving distance. I am looking at bolt in Roll bars and like the MM bar the most, but i'm not sure it would pass tech. top of the hoop must be a Max 6" from the driver's head. in my normal driving position I am more that 6" away from where the MM bar would be from my helmet.
Does the MM bar meet this spec? I think the RPM bar will but looks like it bolts right to the floor.....
i'm also not sure how I feel about the curved diagonal and harness bars although nothing is said about it in the rules. anyone have any problems getting the MM roll bar through a SCCA level 3 Time Trial or 4 hillclimb tech? anyone have any experience with the RPM bar?
10.3. TRACK TRIALS (LEVEL 3)A minimum of a roll bar meeting the requirements of this section of the TTR shall be required in all cars.
10.3.1. BASIC DESIGN CONSIDERATIONS
A. The basic purpose of the roll bar is to protect the driver in case the vehicle rolls over or runs into an obstacle such as aI. No portion of the safety roll bar shall have an aerodynamic effect by creating a vertical thrust.
guardrail or catch fence. This purpose should not be forgotten.
B. The top of the roll bar must be a minimum of two (2) inches above the drivers’ helmet when the driver is sitting in a normal driving position (as near the roof as possible on closed sedans) and shall not be more than six (6) inches behind the driver. In
case of two driver cars, both drivers must be within the roll bar height requirement, however only one driver must be within six inches of the roll bar.
C. The roll bar must be designed to withstand compression forces resulting from the weight of the car coming down on the roll structure, and to take fore-and-aft loads resulting from the car skidding along the ground on the roll structure.
D. The two (2) vertical members forming the sides of the hoop shall not be less than fifteen (15) inches apart (inside dimension).
It is recommended that the roll bar extend the full width of the cockpit to provide maximum bearing area in all soil conditions
during rollovers. The roll bar vertical members on formula cars and other single seat cars with a center driver position must be
not less than fifteen inches apart, inside dimension, at their attachment points to the uppermost main chassis member.
E. An inspection hole of at least 3/16 inch diameter must be drilled in a non-critical area of a roll bar member to facilitate
verification of wall thickness. This should be at least three inches from any weld or bend.
F. It is recommended that steel gusset plates be used at all welds. Gussets should be at least two inches long on each leg and
3/16 inches thick.
G. It is recommended that roll bars be coated only with a light coat of paint. If, however, a roll bar should be chrome-plated, it is
recommended that the structure be normalized.
H. Post or tripod types of roll bars are not acceptable.
Does the MM bar meet this spec? I think the RPM bar will but looks like it bolts right to the floor.....
i'm also not sure how I feel about the curved diagonal and harness bars although nothing is said about it in the rules. anyone have any problems getting the MM roll bar through a SCCA level 3 Time Trial or 4 hillclimb tech? anyone have any experience with the RPM bar?