Gearbox Cooler

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greenMachine
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Re: Gearbox Cooler

Postby greenMachine » Sat Mar 10, 2012 1:26 pm

BOYRCR wrote:
greenMachine wrote:You don't need a filter block to monitor temps, you can get in-line housings.


I wanted to use a filter block for ease of selecting filters and replacing when servicing. I don't want to have to chase down an over priced filter that takes two weeks to get in when I can use the same filter for the engine oil as the gearbox and it screws on and off. Instead of an inline one the would be messy.


Good logic - I hate spilled oil, and I hate cleaning up the mess.

Correct me if I am wrong, but I thought gearbox oil, especially when cold, is pretty viscous. Put a filter in there, and you will have to be sure the pump will do the job until it warms up - probably rules out a cheap ebay pump? Same goes for the filter, I don't know how well an engine oil filter will handle gearbox oil, or whether a physically similar version exists for gearbox oil duty.

If it were me, I might limit myself to a strainer, but perhaps I am just blissfully ignorant of what is floating around in the crap in the gearbox sump :shock: :lol: Actually, an inline strainer would be good, as it will give you clear warning of bits coming off components in the 'box. I am not so sure that a conventional oil filter is as easy use for diagnosis. I am thinking of the petrol filters that have a filter element in a glass bowl, in a more racecar friendy package, would be a good all-in-one solution.

As far as chasing them down, buy them by the boxful (well, however many you need for a season say) regardless of what sort you use ... :wink: :D

:mrgreen:

Edit: Have you talked to the tech dept of the oil company - they could help by confirming what will or won't work.
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Okibi
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Re: Gearbox Cooler

Postby Okibi » Sat Mar 10, 2012 1:43 pm

I was thinking the same re viscosity, strainer seems a good compromise.
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Re: Gearbox Cooler

Postby ralt » Sat Mar 10, 2012 2:10 pm

Hi.
Lots of great ideas to solve a perceived problem when you do not know whether it is a problem. If it was me i would drill and tap the gearbox fit a temperature gauge sender go racing and monitor the temps. You may find you do not have to do anything. I really do not understand why you need a filter seems to be over engineering.

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Re: Gearbox Cooler

Postby greenMachine » Sat Mar 10, 2012 3:21 pm

ralt wrote:Hi.
Lots of great ideas to solve a perceived problem when you do not know whether it is a problem. If it was me i would drill and tap the gearbox fit a temperature gauge sender go racing and monitor the temps. You may find you do not have to do anything. I really do not understand why you need a filter seems to be over engineering.


I am guessing you don't race a turbo MX5. And haven't broken a gearbox or three ...

Putting 200rwk or so through slicks tends to point up the weak links, and that seems to end up as the gearbox.

:mrgreen:
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Re: Gearbox Cooler

Postby manga_blue » Sat Mar 10, 2012 4:13 pm

I can't see the need for a filter. How about a serious magnet in an accessible housing somewhere along the cooling hoses? That would mean you just have to unscrew the magnet from time to time to see what how what sort metal is getting washed off the gears. Might take a bit of thought about making sure that the chunky bits get that far though.
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Re: Gearbox Cooler

Postby greenMachine » Sat Mar 10, 2012 4:35 pm

manga_blue wrote:I can't see the need for a filter. How about a serious magnet in an accessible housing somewhere along the cooling hoses? That would mean you just have to unscrew the magnet from time to time to see what how what sort metal is getting washed off the gears. Might take a bit of thought about making sure that the chunky bits get that far though.


I am not sold on the NEED for a filter (as opposed to a fine strainer), but when you have gone to the trouble/expense of plumbing in a pump, lines, cooler, temp sender, ... a filter is little enough extra work/expense (making some assumptions here about this, and the general feasibility of filtering gearbox oil - see above), and given the fragility of these boxes at high engine RWKWs it might be enough insurance to tip me into one - if I had a turbo racecar.

Mind you, my car is an atmo car, so I will be doing nothing along these lines to my car bar regular gearbox oil changes :wink: however I am interested in the issue, you never know when some knowledge will come in handy 8)

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Re: Gearbox Cooler

Postby BOYRCR » Sat Mar 10, 2012 9:12 pm

The oil I use is royal purple. Viscosity 75W-90. Royal purple sell an oil filter witch filters up to 25mc. I am assuming this is for the engine oil but I have seen engine oil with level of viscosity before.

http://www.royalpurple.com/wp-content/u ... ilter1.pdf
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Re: Gearbox Cooler

Postby zoomzoom » Mon Mar 12, 2012 11:14 pm

FYI the viscosity of a SAE 90 grade gear oil is similar to a SAE 40 grade engine oil, both at 100C, gear and engine oils are graded on different scales.

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