confused about diff fluid
 

best fluid to use for crt on a clay track....just broke a rear cap joint probably from a jump landing

i'm running a 1515/2.5d on 6s geared 12/62 MMM ......truck wants to pull the front wheels slightely

just use naptha to clean the gears? and dry off with paper towels?

Try 7 20 3

I run 7/30/5 with my 8ight-t on a similar surface

If you mix equal amounts of 50k and 10k would you then have 40k?

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.

This should clear things up.
 

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

To sum things up...
 

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

if you want 40k, you need 86% 50k and 14% 10k.


http://www.gesilicones.com/gesilwiza...ng/fluid2.html

That's what I said earlier. :wink:

BTW: I have that same calculator at my site. I just viewed the formula the script uses and added my own error checking and such. Since it is directly based from that gelsilicones site, I put credits at the top of the page.

Me to
 

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

You beat me to it James:diablo:. I was thinking that exact same thing as I started reading their posts:eyes:. If you have to work that hard to figure something like what portions of each grease to mix in order to get the right concoction for your setup:oh:, then it is time to just spend a few dollars and get the right grease in the first place:diablo:. What a brain twister that is.:oops:

Thats what I love about this site though, is having PROs like them to answer a question like that, and then have guys like us who say just buy the right thing up front and avoid frying your brain.

oops, I missed it the first time. I just scrolled back up and saw it...my bad:oops:

cool that you added it to your site tho.

Guys....easy....the 50k -10k thing was meant as a joke! I only quoted some professor's explanation of the formula when someone else did it too.....I thought it was funny....:sarcastic::sarcastic::sarcastic:

Yea funny stuff.
 

Guys....easy....the 50k -10k thing was meant as a joke! I only quoted some professor's explanation of the formula when someone else did it too.....I thought it was funny....



Yes we thought it was funny to, that was the point. :lol::rofl: