 wheelie bar length, wheel bar length calculation |
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 Feb 3 2010, 12:43 PM
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#1
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Member  Group: Members Posts: 24 Joined: 20-January 10 Member No.: 8,545  |
Finishing the build on my 125" altered...has a single wheelie bar...
Is there a formula to determine the correct length bar for a 125" chassis? Promise...pics will follow soon Mike |
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Feb 3 2010, 12:50 PM
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#2
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 Advanced Member Group: Members Posts: 56 Joined: 5-June 08 Member No.: 11 |
i don't know of any formula.....but i built mine 8 feet long.
-------------------- Darren Russell
Russell Performance Engineering |
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Feb 3 2010, 03:41 PM
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#3
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 Advanced Member Group: Members Posts: 154 Joined: 19-October 08 From: San Antonio, Texas Member No.: 763 |
I've heard the longer the bar the softer the "hit" when you "use it". The McKinney alky chassis I had, had a 9' (108") long wheele bar on it.
-------------------- A very short spelling lesson
1. The last four letters in "American" = I Can 2. The last four letters in "Republican" = I Can 3. The last four letters in "Democrats" = Rats End of Lesson. Test to follow in November. November will be set aside as rodent extermination month. |
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Feb 3 2010, 06:01 PM
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#4
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 Advanced Member Group: Members Posts: 256 Joined: 21-December 08 From: Tampa, Florida Member No.: 3,560 |
Just about 7 feet here, the longer ones flex more, and have a softer hit. For our car it is especially important (rear engine funny car)
 
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Feb 4 2010, 06:33 AM
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#5
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 Advanced Member Group: Members Posts: 219 Joined: 13-September 08 From: Jensen Beach, Fl Member No.: 79 |
Hardtail or suspension?
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Feb 4 2010, 09:41 AM
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#6
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 Advanced Member Group: Members Posts: 45 Joined: 6-June 08 From: St. Charles, MO. Member No.: 39 |
I always thought 1/3rd of the wheelbase, but maybe that's for front engine dragsters. Now I'm curious and will have to measure mine.
Sorry, that was the ladder bar formula. Wheelie bars should just be somewhere between 60" - 100". -------------------- 1994 Undercover Chassis 23T altered
member of The Torque and Recoil Club |
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Feb 4 2010, 02:06 PM
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#7
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Member Group: Members Posts: 24 Joined: 20-January 10 Member No.: 8,545 |
its a hardtail 125" altered...current bar is 4ft...125" divided by 3 = 42" ?about right at 48"???
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Feb 4 2010, 02:29 PM
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#8
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Advanced Member Group: Members Posts: 56 Joined: 5-June 08 Member No.: 11 |
if you are really going to get after it....and make quite a bit of power then do yourself a favor and build a long bar. it is just so much easier to tune the car this way. the trick is to build it strong enough to take the initial hit, but flexible enough to bend a little and not unload the tires.
Darren -------------------- Darren Russell
Russell Performance Engineering |
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Feb 4 2010, 05:50 PM
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#9
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Member Group: Members Posts: 24 Joined: 20-January 10 Member No.: 8,545 |
this engine/trans combo in my 235" RED went 7.32 @ 180 at Tucson (5800 density altitude)
planning a mar 6 test flight, if we get everything done in time |
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Mar 15 2010, 12:36 PM
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#10
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Member Group: Members Posts: 22 Joined: 14-March 10 From: ky Member No.: 8,554 |
MR RUSSELL AN BACKMOTOR thank you for the poto,s that helped me out i just got mine done its 8 feet long 1" cm what yall think
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Mar 15 2010, 07:33 PM
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#11
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 The Boss Group: Root Admin Posts: 809 Joined: 5-June 08 From: palm city florida,laurel maryland Member No.: 2 |
Looks good.
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