confused about diff fluid

[stum]

50 + 10 = 60 /2 = 30k So no.. w/o doing the math I'd do about 25% 10k

[BrianG]

Originally Posted by stum

50 + 10 = 60 /2 = 30k So no.. w/o doing the math I'd do about 25% 10k

Equal parts of 50 and 10 gets you 22.5. It's not just getting an average. The formula is:

mixfluidA = ((log(targetvisc) - log(viscfluidB)) / (log(viscfluidA) - log(viscfluidB)) )

mixfluidB = 1 - mixfluidA;


To get a 40k mix, you need 86% of 50k and 14% of 10k.

[GREYGHOST]

Calculating the viscosity of a blended liquid consisting of two or more liquids having different viscosities is a three step procedure. The first step involves calculation of the Viscosity Blending Index (VBI) of each component of the blend using the following equation (known as a Refutas equation):

(1) VBI = 14.534 × ln[ln(v + 0.8)] + 10.975

where v is the viscosity in centistokes and ln is the natural logarithm (Loge).

The second step involves using this blending equation:

(2) VBI-blend = [wA × VBIA] + [wB × VBIB] + ... + [wX × VBIX]

where w is the weight fraction (i.e., % ÷ 100) of each component of the blend. In using the above blending equation, it is necessary that all viscosities are determined at the same temperature, for example, 100 °C.

The third and final step is to determine the viscosity of the blend by using the invert of equation (1):

(3) v = (ee(VBI - 10.975) ÷ 14.534) − 0.8

[lincpimp]

It is best to just buy the correct fluid, as reading the last 2 posts has given me a headache.

Considering you have slight tendancy to wheely, you may have about the right fluid in the center diff now, maybe a bit too thick. If the front tires are growing huge the fluid is too thin, and if the truck wheelies then the fluid is too thick. I think some front tire growth is acceptable, as it will help pull the truck around corners. The pro nitro racers run light fluid, and go thru a set of front tires in a single race... I noticed this when looking at the race action pics in the rc mags, and checking out the racer's riders section they usually do on the national race winners.

I run thicker fluid as I like wheelies (no racing for me!) and really like tires to last...

i asked chad bradley this question on neobuggy he said 20-30-1 i ran that the whole time i had my crt and loved it