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Old 07-12-2006, 10:19 AM
Sudden Psycho 31's Avatar
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Racing Gear Oil Question

I have a question on what oil to use in the rear end of 9 inch floater. It is used in a short dirt track circle car with 6.2 gears. We have been using VERY high quality gear oil, which is super thick. I understand that it thins some when at operating race temperatures, but was wondering what others are using.

It seems that a little thinner oil would have less drag, and produce a little more power. You lighten every component you can... then drop in the gooey-est gear oil in the rear. Doesn't make a lot of sense.

Of course going remotely close to being to thin would make me nervous.

I guess I am just curious if anyone has experimented in this area. Every little edge helps.

thanks 31

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Old 07-12-2006, 10:34 AM
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Of course we know that chassis dynos record noticable improvements by using synthetics.

I am a big believer in synthetics. I would think that worn-in gears could use lighter weight synthetics without problems. Maybe with Lucas additive.

First I think that I would take some temp readings after each race using infra-red and see how hot it is running after say 6 hot laps, 10 lap race, and 20 lap features. That way you might know how much it is actually thinning.

I have heard that the cup-cars use very light weight lube for qualifying only.

8 years ago we just used 85W90 Mobil 1 and never thought about it... Your results could vary.... LOL

I have often wondered how much oil ends up in the axle tube with all that constant cornering. Usually cars never get truely straight.

Last edited by xntrik; 07-12-2006 at 10:43 AM.
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Old 07-12-2006, 11:09 AM
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Run synthetic, you do not need the heavy viscosity. Royal Purple Max gear oil needs no other additives.

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Old 07-13-2006, 09:28 AM
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thanks for the info... i already run engine synthetics. i think i will try the royal purple and see what i get
i will try the temp readings, before and after, and let you know what i find
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