Manual transmission cooler? or for that matter diff cooler
#27
New Electric Oil Pump for Diff Cooler or Turbo Scavenge Conversion Unlike VDO | eBay
Some line, fittings, a cooler, relay, wiring, and a switch.... Or get fancy and run a coolant temp switch like the OEM miata fan switch.
Some line, fittings, a cooler, relay, wiring, and a switch.... Or get fancy and run a coolant temp switch like the OEM miata fan switch.
#30
Bump!
Anybody install a trans or diff cooler on their miata? It seems reasonable that cooling the transmission would improve reliability, this at least seems accepted as true in other applications (trucks towing, automatic transmissions).
I found this Boat Marine 12V Engine Oil Change Gear Pump 3 2 GPM Transfer Water Electric DC | eBay on ebay, it's rated at 3.2 GPM, and it's a gear driven oil pump. I've searched a lot, and it seems to be the biggest oil pump that's gear driven and electric and not 1000 dollars and weighs 40 lbs.
Doesn't seem like much flowrate to me? Even if you had a 100% effective oil cooler, you'd only be pumping about 3 gallons/minute of cool oil into a box that's having to handle a lot of power on a track. I would think you would want more flowrate, but maybe 3 is enough if your cooler is awesome?
Anybody install a trans or diff cooler on their miata? It seems reasonable that cooling the transmission would improve reliability, this at least seems accepted as true in other applications (trucks towing, automatic transmissions).
I found this Boat Marine 12V Engine Oil Change Gear Pump 3 2 GPM Transfer Water Electric DC | eBay on ebay, it's rated at 3.2 GPM, and it's a gear driven oil pump. I've searched a lot, and it seems to be the biggest oil pump that's gear driven and electric and not 1000 dollars and weighs 40 lbs.
Doesn't seem like much flowrate to me? Even if you had a 100% effective oil cooler, you'd only be pumping about 3 gallons/minute of cool oil into a box that's having to handle a lot of power on a track. I would think you would want more flowrate, but maybe 3 is enough if your cooler is awesome?
#35
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Keeping the trans temp below 230 may be a tall order, it runs a lot hotter than most realize. All the more reason for some experimentation in this area though. Personally would prefer an electric pump rather than gear driven I think..
-Ryan
-Ryan
#37
Well so far it's the best pump I've found under 500 bucks, so I'll probably just buy it, hook it up, and report back whether it works or not and if it leaks or not. Unless someone finds a better one!
Ryan- I agree, I don't think pumping 3 GPM of cool oil into a box that's handing 300+ hp is going to be enough to keep it cool, but I'd love to be wrong. I guess either way I'll find out.
So lets talk about heat exchangers for this. Where would you put it? How big? Fan or no fan? What size lines? I mean we're going to be pumping gear oil, so I'm thinking minimum 1/2" hoses.
Probably have the pump close to the transmission, so you don't have a lot of restriction on the inlet side, then let the pump push the fluid around to a heat exchanger and back.
Ryan- I agree, I don't think pumping 3 GPM of cool oil into a box that's handing 300+ hp is going to be enough to keep it cool, but I'd love to be wrong. I guess either way I'll find out.
So lets talk about heat exchangers for this. Where would you put it? How big? Fan or no fan? What size lines? I mean we're going to be pumping gear oil, so I'm thinking minimum 1/2" hoses.
Probably have the pump close to the transmission, so you don't have a lot of restriction on the inlet side, then let the pump push the fluid around to a heat exchanger and back.
#38
That pump looks fine, ryan its an gear-rotor electric pump like the same type of pump as the oil pump but driven with an electric motor. Probably only has one seal from looking at it and its probably an oring so it should be fine.
Pat, pretty spot on on pump placement. For tranny connection, were you planning on drilling and tapping or using drain and fill holes already there? A banjo fitting would probably fit on the drain hole pretty easy and have a low profile.
Heat exchange wise. Does anyone have any temperature data at all? Just knowing the mass of fluid, the mass of aluminum and the mass of steel in the tranny, and the time it took to raise the tranny and fluid to x temperature you could figure out how much heat rejection capacity you need with the heat exchanger. Or you could just guess randomly and measure temps and compensate from there.
Pat, pretty spot on on pump placement. For tranny connection, were you planning on drilling and tapping or using drain and fill holes already there? A banjo fitting would probably fit on the drain hole pretty easy and have a low profile.
Heat exchange wise. Does anyone have any temperature data at all? Just knowing the mass of fluid, the mass of aluminum and the mass of steel in the tranny, and the time it took to raise the tranny and fluid to x temperature you could figure out how much heat rejection capacity you need with the heat exchanger. Or you could just guess randomly and measure temps and compensate from there.
#39
That pump looks fine, ryan its an gear-rotor electric pump like the same type of pump as the oil pump but driven with an electric motor. Probably only has one seal from looking at it and its probably an oring so it should be fine.
Pat, pretty spot on on pump placement. For tranny connection, were you planning on drilling and tapping or using drain and fill holes already there? A banjo fitting would probably fit on the drain hole pretty easy and have a low profile.
Heat exchange wise. Does anyone have any temperature data at all? Just knowing the mass of fluid, the mass of aluminum and the mass of steel in the tranny, and the time it took to raise the tranny and fluid to x temperature you could figure out how much heat rejection capacity you need with the heat exchanger. Or you could just guess randomly and measure temps and compensate from there.
Pat, pretty spot on on pump placement. For tranny connection, were you planning on drilling and tapping or using drain and fill holes already there? A banjo fitting would probably fit on the drain hole pretty easy and have a low profile.
Heat exchange wise. Does anyone have any temperature data at all? Just knowing the mass of fluid, the mass of aluminum and the mass of steel in the tranny, and the time it took to raise the tranny and fluid to x temperature you could figure out how much heat rejection capacity you need with the heat exchanger. Or you could just guess randomly and measure temps and compensate from there.
I'm figuring that too much cooling is never bad, so build it big and see what it does. If it's too big the pump won't run all the time, so no harm their.
I will do a little calculations at some point, just haven't yet. Working on wiring design for my car right now. But the CP of oil looks like it was ~1.7 kJ/kg*K, so much less than water.