posted February 23, 2002 01:48 PM
Machinah, The seat should NEVER be mounted to the floorboard,so your tracks rule is a good one.
Usually,stockcars have a "seatbar" that is welded to the lower door bar and the rear hoop crossbar. This way, in the event you are hit in the door and the door bars start moving inward,YOU move inward with the blow,verses remaining stationary and in harms way...... When I build a stockcar,I run a straight tube from the rear hoop to the front down bar,one inch above the floorpan sheet. (This is in effect,another door bar, it just runs straight instead of being bent out toward the door skin.) It is this bar that I weld the seatbar to.
The seat is bolted at the front to tabs welded to the seat bar. The back of the seat is bolted by some means to the rear hoop crossbar. Some shops just weld some tabs to the rear hoop crossbar.Then the customer uses some pipe or tap tube spacers and long enough bolts to get the job done. This is done for several reasons, it is fast and easy and there is no way for them to know where the indivdual racer is going to want his seat. This method is widely used,it works well,so I'm not putting down. I prefer to fit each driver to his seat,and make brackets out of 1/4 thick,2 in. wide flatstock welded to rear hoop crossbar.
However,this doesn't particulary lend itself to making the seat moveable very well.(which you seem to wish to accomplish)
The only adjustable seat slider that I have seen was a piece of junk and I wouldn't put it on a kids push cart,much less a race car.
However,I have not seen the Kirkey rail,SO I'M NOT PUTTING IT DOWN,I KNOW THEY MAKE GOOD PRODUCTS AND ARE WONDERFULL PEOPLE,I HAVE A KIRKEY SEAT MYSELF AND THINK ITS GREAT. But just on GP I don't like sliders,one more thing to go wrong at the worst possible moment.(remember that the damage that you car (and YOU) are subject to increases at the square of the velosity)
If you do use a slider,you will need to install another bar at the back of your seat bar to catch the rear mounting point of the slider assembly. Then you still have the matter of supporting the back of your seat.You will have to have different bolt/spacers for your different seat positions. In any case,I would not install a seat that was not bolted on the back for any reason. Others may disagree but if I am going to make a mistake,I am going to err on the side of safety,and I hope that you will also.
In the end,just make sure your seat is bolted to the cage.You should in no way,shape or form depend on the sheetmetal floor to support you.
You should be able to get a diagram from Kirkey showing proper seat mounting.This is what they do,and they want to make sure thier seats are mounted properly.
Same deal with your belts,a diagram and detailed instructions come with every set sold.....Follow it to the letter.
These are my thoughts on the subject,I will make my phone number available to you (or anyone else) if you wish to discuss this matter in person,as I feel this is very important. I make no claim to be an expert,but I am always glad to help if I can.