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Scaling a Kart - How to get rid of cross wt and balance it
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Tero Kuha



Joined: 25 May 2012
Posts: 3

PostPosted: Tue Jan 01, 2013 7:44 pm    Post subject: Reply with quote

Ambrose Buldo wrote:

This gave me 83.5 69 - 152.5 = 41.1%
99.5 119 = 58.9

Then I went to the Left spindle where I had washers above and 2 washers below (same on other side) and switched the left front to 1 above and 3 below. This netted the fllowing

70 84 = 154 41.5%
112 106 58.5%


Did you swap R/L numbers above or those actually changed as you say?

What type of scales you have? Are those level also under pressure? Try swapping scale places and if it doesn't help, try turning the kart other way around.

Ensure front tires are straight forward, steering wheel position doesn't matter.

If it isn't scaling issue, I would hop on chassis to get numbers right Rolling Eyes
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Ambrose Buldo



Joined: 06 Jul 2009
Posts: 260
Location: United States, New Jersey, Old Tappan

PostPosted: Tue Jan 01, 2013 8:31 pm    Post subject: Reply with quote

I did not transpose the numbers, changing the LF spindle spacers (Moving spindle up) reverses the cross weights.

While not race scales, the scales are digitial freiegt scales recently calibrated. We used then sucessfully with the Formula car. Scales are Setup on a level pad, cross checked with a framers level.

At this point, I don't have any more time. going to put it in a truck and take up to a prep shop and let them take care of it.

Thanks to everyone who provided input...
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Ambrose Buldo - AKA Racer27
Old Tappan, NJ 07675
Current: Citation FC2000 (For Sale), Madza RX8, VW Eos
Kart for myself: Intrepid Silverstone Pro w/HPV3 --- With a ROK TAG engine waiting in wings
Kart for Daughter: 2001 Birel ARC-100
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Tony (Toe-Knee!) Morrison



Joined: 15 Nov 2007
Posts: 28

PostPosted: Tue Jan 01, 2013 9:32 pm    Post subject: Reply with quote

Ambose. Your results would indicate that the spindle spacer change you made, was larger then required, to correct the issue. (It (almost exactly) reversed your results, meaning that it was about twice the change needed) -Measure your spindle spacers, and get some that are half as thick. Splitting the difference should get you pretty close. (The washers need to be HARD, so try to use stainless steel, or something maufactured for use as a spindle spacer.) -Did you try to measure the Spindle mount heights? Lay the kart on a FLAT surface, without wheels/tires, to make a measurement. Make sure nothing is interfering with the kart frame sitting flat on the flat surface (radiator clamps, zip ties, engine mount, etc) You should be able to see/measure the difference using a tape measure, but use a vernier caliper, if one is available, as it will give more accurate results.
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al nunley



Joined: 13 Nov 2006
Posts: 3027

PostPosted: Wed Jan 02, 2013 8:44 am    Post subject: Reply with quote

If you would post the numbers like this;
LF 80.5 RF 90.6 = 171.1
LR 100 RR 110 = 210
It would help us read your numbers. We all have software to calculate the percentages and total weight, so no need to include that.
What??? You don’t.
Email anunley@austin.rr.com for a free Excel spreadsheet.
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If the data does not support the theory, get a new theory. (Al Nunley)
All else being equal; Compression is the Holy Grail.
45 years, in and around karting
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Chris Parks



Joined: 09 Sep 2001
Posts: 1504
Location: Australia, not USA state,

PostPosted: Wed Jan 02, 2013 4:13 pm    Post subject: Reply with quote

al nunley wrote:

What??? You don’t.


You must be psychic, never needed them.
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understeer happens on road courses and usually is pronounced with a British accent. Push happens on ovals and usually is pronounced through a wad of chew. Other than that, I don't think there's a difference - Jim Derrig


Chris
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