Woodburn Dragstrip
7730 Hwy. 219
Woodburn, Oregon
503-982-4461

Tuesday Tech Question (12/10)

The Tuesday Tech Question is a fun section where prospective technical inspectors or anyone who wants to get a better idea of how to work the NHRA Rulebook can test their knowledge and search abilities. If you have an NHRA Rulebook, try and find the answer to the question in the book before looking down at the answer. If you don’t have a Rulebook but are an NHRA Member, you can download a pdf at nhra.com under ‘Member Benefits’.
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 Question:

I have a ’73 Duster that I compete in Pro ET with at my local NHRA track.  The car currently has a roll bar in it.  The car has a back-half installed, but the firewall, floor, and body are all stock.  This offseason I plan to build a new engine that should put my car into the low 6 second range in the eighth mile.  Will I need to install a complete roll cage?

Duster Dave

 

Answer:

Duster Dave,

If your car will be running quicker than 6.40 in the eighth mile or 10.00 in the quarter mile you will need a roll cage even though you have an unaltered firewall, floor, and body. Between 10.00 (6.40) and 10.99 (6.99) cars with your configuration are only required to have a roll bar so long as it is not a convertible.  Cars without an unaltered firewall, floor, or body running 10.99 (6.99) or quicker or faster than 135 mph must have a complete roll cage.

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