Ital axle oil qty

Ital axle oil qty

Author
Discussion

pikeyboy

Original Poster:

2,349 posts

213 months

Thursday 23rd July 2015
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I'm changing the diff oil and James Whiting has moved the oil fill point higher up the axle case when he built my car. It's now above the stiffening rib. Any idea how much oil I should put back in to suitably over fill it. I only ask as at donington it was spitting quite a bit of oil mist out of the breather.

HustleRussell

24,602 posts

159 months

Thursday 23rd July 2015
quotequote all
Three litres- yes really! Extend the breather with a rubber hose up to just below the boot floor.

pikeyboy

Original Poster:

2,349 posts

213 months

Thursday 23rd July 2015
quotequote all
Thanks for that. It does sound a lot and prem previous testing I've done of diff drag losses due to oil viscosity qty its sapping quite a bit of power. However if it keeps my diff alive so be it!

HustleRussell

24,602 posts

159 months

Thursday 23rd July 2015
quotequote all
I used to race in Classic Graduates with an ital axle and Vauxhall engine. I killed two or three diffs in as many seasons before realising that I wasn't putting enough oil in, the season I did that I stopped killing diffs. Even though I was racing the extra reliability at the cost of a little drag was a fair trade.

BertBert

18,954 posts

210 months

Thursday 23rd July 2015
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boy said:
Thanks for that. It does sound a lot and prem previous testing I've done of diff drag losses due to oil viscosity qty its sapping quite a bit of power. However if it keeps my diff alive so be it!
How much power sapped out of interest?

pikeyboy

Original Poster:

2,349 posts

213 months

Thursday 23rd July 2015
quotequote all
BertBert said:
boy said:
Thanks for that. It does sound a lot and prem previous testing I've done of diff drag losses due to oil viscosity qty its sapping quite a bit of power. However if it keeps my diff alive so be it!
How much power sapped out of interest?
Sorry Bert Bert but it was when I worked in a drive train consultancy and I can't really say as our client would get upset. We did have a crown wheel in a large tank. torque transducers in the drive shaft and played with different oil levels and viscosities. I can say it would be worthwhile investigating using the lowest viscosity and fill level though if you're at the sharp end of the grid.

CaterBram

126 posts

174 months

Sunday 26th July 2015
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I normally put 1.9litres of redline ATF in, any more and i've always had seal issues.

If your running with standard half shafts make sure that if you take your half shafts out for any reason, replace the shaft oil seals.

pikeyboy

Original Poster:

2,349 posts

213 months

Sunday 26th July 2015
quotequote all
My car has the JW disk conversion on it and I've never had an issue with leaks when having around 3ltrs in it. With respect atf in axles, I'd have thought your bevel gears would have been happier with a more traditional hypoid gear oil.