mine is gone for free

Guys,

I have a cooler and pump set up on my '16.

let me know if you want to see some pics and i will post up.

I am running over 400RWHP and barely see diff temp over 65 on a 15 lap race...... I had an extended housing from Greddy but as you all would know, the larger volume of oil took longer to heat up but still eventually reached the same temp, was a waste of time.

_________________
Cheers

Brad 'Cusco' Cuss
Race BRE 510 Replica....on Steroids!

Hi Turbovan and Cusco,

Post some pics up!

Cusco, as I am only going to be doing sprints (so perhaps 6-8 laps at full speed max if I am lucky), i'm not really worried about getting a cooler, but the extra oil capacity and the fins provides a little more 'confidence' the diff will cool down a little quicker between runs and perhaps be a little better in making sure the oil is kept up during "high G" events...
Are you running a clutch pack diff? What temperatures did you end up seeing?

Lampy,
I would be eager to see some data logging for diff temperature!!

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1972 Datsun 1600, S14 SR20DET Engineered (204rwkW @ 17psi.)
viewtopic.php?t=6579
#SR20Datsun @SR20Datsun

Note the blue return line on the left.

(hope this works it is the first pic i have posted).......

ill post up some more of the pump, cooler and set up if this works.

Cheers,

_________________
Cheers

Brad 'Cusco' Cuss
Race BRE 510 Replica....on Steroids!

You're seeing diff oil temps of 65c?
The oil is only just starting to get "loose"
It can handle 150c. before it breaks down.

The foaming out the breather, tap a larger diam thread into cover, screw in a larger barbed fitting, and run a flex line straight up into boot, into a seperator/breather can, vent that to the fuel filler hatch recess so the smell is gone.

Alesser variant, a short bit of hose out the breather, into a cheapo $2 clear Ryco type plastic fuel filter, but keep it upright to allow drainback.

Only time we saw very high temps was in long distance dirt rallies in a 260Z, the std cover was welded, milled drilled and tapped for dash fittings to an oil cooler, pump was a Jabsco Water Puppy,and cooler, all protected by mesh guards, up above halfshafts and next to wheel well on rhs.
Manually switched on by navigator, once temp guage hit 100deg or so, the pump would not flow below 60 due to viscosity.

In circuit racing ( not 6-8 lap sprints) have run 25 lap events, with no coolers/finned covers, and no issues with heat or breakdown of oil.
Diff is set at 140 lbs breakaway, car does 1.55's at PI and Eastern Ck,( 25 lap races there)

Bit of a wank factor these finned covers, they keep latent heat in the oil, due to higher volume.

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Yep, i race a Datsun, and I drive a truck, sometimes I get confused, and then the truck goes fast, and the Datsun gets a lot of boxes shoved into it. AWW GEE

Dat2Kman,
what size diff are you running for the 25lap circuit events?
Are you measuring the temperature during this time with a temperature gauge, or logging temp?

About foaming out the breather, what is the root cause?
Once the oil starts to foam, it becomes a more effective insulator (as air insulates), so you would think the diff would get hotter and hotter, which would make the situation worse. This would break down the oil, maybe cavitation would occur, and the oil would loose its shock absorbing properties..
So what can be done to minimise the foaming? Change the oil to a different brand? Reduce the temperature? (assuming foaming only occurs during hot temperature?) Change to a lighter viscosity (to reduce friction in the oil?)

I would assume the finned cover (with extra capacity) allows slower warm up time (getting up to hot temp), but also the greater surface area of the finned cover allows greater cool down temp during and between 'sprints' or 'circuit races'. This has got to make a difference.
I guess the proof would be in someone who is running one doing some back to back testing though.

My R180 is notorious for foaming when doing 2-3 hard laps. I'm running Motul competition oil with the Torsen LSD.
Changing to the R200 from the R180, potentially with a different centre (Kaaz clutch pack or maybe Quaife ATB), should increase the amount of oil, thermal mass and potentially reduce the internal friction on the crownwheel and pinion as they are slightly larger.

_________________
1972 Datsun 1600, S14 SR20DET Engineered (204rwkW @ 17psi.)
viewtopic.php?t=6579
#SR20Datsun @SR20Datsun

One thing I read years ago is that a finned sump, be it engine gearbox or in this case, diff, will only be truly effective if the fins are on the INSIDE of the device as well.
More surface area for the oil to contact and therefore shed heat.


Having said that, the design of the extended capacity and shape of the externally finned sump/cover will add more surface area to for the oil to contact by default.

I can't see how a finned cover can be worse in performance but maybe not cost effective if you pay lots 'o dollars for it.

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Regards, Graeme
Just trying to help...
http://nissanman.shutterfly.com/
graemes@internode.on.net

Hi guys, below are some pics of the cooler set up in my race car.

The diff hat is modified internally in an attempt to separate the cool oil returning from the cooler. the cooler is a Mocal item with a Tilton gear pump and and -8 400 series Speed flow plumbing.

The issue with excessive temp (150 ) is not only oil degradation but the wear on bearings and contact area of the pinion and crown-wheel, not to mention the tolerance increase in the machined parts. From a design perspective the L10 bearing life and load carrying capacity begins to decrease rapidly for every 10 degrees C above 80. In the case of of 150C the bearing life is down to 1/5, This issue is also compounded where the bearing is shimmed and not a C3 style clearance bearing...


Diff hat


Cooler and Pump


Cooler

Cheers

_________________
Cheers

Brad 'Cusco' Cuss
Race BRE 510 Replica....on Steroids!

Very interesting Cusco. Thanks for posting pics and at the same time explaining the temperature difference and the effect.

_________________
1972 Datsun 1600, S14 SR20DET Engineered (204rwkW @ 17psi.)
viewtopic.php?t=6579
#SR20Datsun @SR20Datsun

Here are some pics of the nismo one

Designed to be used with external cooler by the looks of it. There are studs for the moustache bar, a breather and 2bolts which would fit the internal baffle screw holes.

Also a couple of comparison shots with standard S13 cover

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1971 Datsun P510 SR20DET 276 rwkW
2005 Mercedes AMG E55 350 kW
1969 Datsun P510 L20B EFI 95 rwkW
1975 Ford XB Fairmont GS Wagon 179rwhp
1980 Escort Van SR20DET unfinished
2002 Suzuki GSX1300R Hayabusa 185hp

Thanks for posting the pics Chris. Always good to see what is out there. Handy having the part number, but I have a feeling they would be all sold out by now!
I have sourced a Z31 cover from Canada. I'll post up some photos when I get it..

I'm still very interested to know about diff temperature and what everyone is getting (who has a temp. monitor). I want what I am putting together to last!

_________________
1972 Datsun 1600, S14 SR20DET Engineered (204rwkW @ 17psi.)
viewtopic.php?t=6579
#SR20Datsun @SR20Datsun