Technical > Roo Man's Room

chassis top rail has bowed outwards

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Curly1:
You need to be able to control the wheelies. On my 225" FED I can pick up front wheels 4 feet high and carry them out well past 60 foot? or with just 25 Lbs on front and no other changes will pull them up 4 inches and maybe carry them 2 feet? I do not even run my wheelie bar any more I use weight up front to control wheelies.

nitroscott:
I am building my chassis 225" also. Thanks for the info about putting weight up front to control wheelies. Now I just have to figure out a good way putting weight up front. I am building the nose now and it would be real easy to incorporate some kind of aparatus for weight carrying. My engine is a SBC 350 and it is out 50 inches from the center of rear housing. The only thing I can think of is to stack plates on a small pole on a plate attached to the chassis.

Curly1:
So at the end of season last year I was experimenting with taking wheelie bars off and using weight to control wheelies. It sort of worked but created another problem, popping front tires out of beam. A little weight on the front makes a big difference but after trying it with out the wheelie bars I am going back to them. WHY? Well because it was popping front tires out of beams and wheelie bars seem to help that. It was popping out of the beams then it set them back down and after that it did a beautiful power wheelie.  But you can not win if it is popping out of the beams as it goes red and is not consistent. So I have moved the battery from the middle to the nose adding 17 Lbs up front and then putting another weight plate to add 35 Lbs up front and will be running the wheelie bar again.

What I think was happening from the video was the rear tire was wrapping up and front end coming up out of beams, then it goes right back down and slowly comes up. With the Wheelie bar it was hitting before the tire gets completely wrapped up and that helped stop it from popping out of the beams. Then as it get up on rear tire it was still allowing it to do a nice little wheelie about 8 inches high and carry it out about 60 foot. If that makes sense.

 One other issue I was having and the weight may help there to is the front tires simply were not doing much. I was cranking the wheel to the right and it was still going left a little. I believe under full throttle if you could scale my car I bet there was not 25 Lbs of weight under at the finish line.

BK:

--- Quote from: nitroscott on March 24, 2021, 12:07:08 AM ---I am building my chassis 225" also. Thanks for the info about putting weight up front to control wheelies. Now I just have to figure out a good way putting weight up front. I am building the nose now and it would be real easy to incorporate some kind of aparatus for weight carrying. My engine is a SBC 350 and it is out 50 inches from the center of rear housing. The only thing I can think of is to stack plates on a small pole on a plate attached to the chassis.

--- End quote ---
If you have a tube front axle fill it with shot. Mine had a couple pipe plugs in it to add and remove shot.

retroboy:
Hey Mate. I bent my chassis doing wheel stands so run a string line along the bottom rails and see if you haven't. Bend the bottom rail upward and the top rail will bend in or out.
Cheers

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