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Author Topic:   pull bar length and angles
badfastjr
Dirt Maniac

Total posts: 193
posted January 20, 2005 04:00 PM  
i have a long wheelbase 3-link. right now my car has about a 36" pull bar and it is angled to the left of the car. so the mounting point on the rearend is left of the mounting point on the chassis. I am thinking of shortening it to about 20" and making it straight from front to back, what do you think these changes will change in the cars handling and do you guys think this is a good thing to do.

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"son this aint a car its a racin' machine."

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted January 20, 2005 08:01 PM  
Putting a shorter pull bar on it will make it react quicker, but its just like using more angle. The shorter it is the quicker it will bite but it won't last as long.

Moving the bar back over to the center of the chassis (to the right) will help load the rear tires more equally. If the pull bar is located in the center of the weight mass of the car it will distribute equal force to both the left and right side tires. Moving it off center either way will load the closest tire more.

To find the center of the weight mass of the car, multiply the rear track width by the left side percentage. Therefore if you have a 60" rear track width and 54% left side weight you would: 60 X .54 = 32.4 So then you would measure 32.4" left of the center of the right rear tire. That point is the center of the weight mass of the car.

Hope that helps.

[This message has been edited by FlyNLoIMCA17 (edited January 20, 2005).]

badfastjr
Dirt Maniac

Total posts: 193
posted January 21, 2005 10:24 PM  
that helps a lot , but how would having a short pull bar with less than normal angle work, because i would think that it would gain angle a lot quicker and give you more bite, and with the tires we run, im not hurtin for bite down the straitaways even a little, so would there really be any problem to having the pull bar left of center and fairly flat. thanks for any help.

[This message has been edited by badfastjr (edited January 21, 2005).]

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