Drag Racing Discussions > Front Engine Dragsters
Cage/Helmet Clearance
lake_harley:
Did a 2nd fitment today with the driver wearing a driving suit (3 layer Sparco) over jeans. Decided to shorten the back "spine" tube of the 5-point cage by 1/2" which will leave 1"-1 1/2" clearance after allowing for the thickness of SFI roll bar padding.
I am going to bend a different spine tube with a bit tighter radius which will allow a longer tube between the front and rear hoops without the cage sticking W-A-Y forward of his helmet. With the rear tube I had the connector between front and rear hoops would have only been maybe 2" long. Leaning the rear hoop back a bit further by having a tighter bend radius on it will also put the rear hoop in a better position, like more out directly to the side of his helmet. I plan to have the front of the front hoop 3-4" out from the front of the helmet, measuring at about the top of the visor opening. I think I read somewhere in regulations that 3" is a minimum, and I believe that was to the front of the front hoop.
If you read anything wrong into what I have tried to describe, please call me out on it and correct me. I want to do this right. To me, it's the most important part of the whole chassis.
Lynn
gregm784:
--- Quote from: wideopen231 on September 21, 2022, 03:07:59 PM ---As tight as we have belts that should be nothing. Now if you wear them loose tighten them .
--- End quote ---
it really depends on how the belts are set up in relation to how you're pulled into the seat. If everything is right, you'll only move an inch or so.
lake_harley:
Belts should be here in a couple days. I ordered UltraShield 3" belts but with a 2" buckle so there's less bulk right in the driver's lap. Also, ordered them with pull-up adjusters on the lap belt so the driver can tighten it well themselves in the confines of the cockpit.
I've begun an initial assembly of the car just to see that everything is going to play nicely together before blowing it apart again for paint, etc.
Lynn
samotorsport:
I had a chat with a SFI inspector about this same topic in the jr dragster.
He told me on a hard tail 2 inch clearance, on a swing arm chassis 1 inch.
But this was for RED juniors . Don t know if the same rule applies for FED .
THE FRENCHTOWN FLYER:
I think SFI specs for dragster / altered are 3" clearance above the helmet to the roll cage.
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