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Howard Jones · 03-17-07, 07:52 PM

First bit of data came in today. Outside air temp about 70F. Ran car down freeway about 15 mins at 75-85mph. Got off freeway and ran through Niles Canyon at relative slow speeds (traffic) for about 10 min. Oil temp in gearbox at this point without running pump yet aprox. 125F.

Turned off Niles and onto ------- canyon (testtrack) ran pretty hard for about 10mins in 2nd and 3rd gear. Engine speeds up to 6K a few times in second and 5K in third. Oil temp in gearbox now 180F ish. Ran pump/cooler for about 2 more mins at same pace. Oil temp in box down to about 160F.

At end of (test track) 5 min later Oil temp in gearbox remained at 160F ish.

It's really gonna take a long hard hot run to get above 225F or so. Not hot enough air temp yet to really see how good this works but it does work.

I should note that the temp sensor for GB oil is in drain hole fitting. I made a big "T" fitting that get good circulation around sensor as oil is pumped out of box. Sensor is selected when pump is on. Otherwise I use the gauge to read engine oil temp.

No leaks all well.

03-17-07, 07:52 PM	#18 (permalink)
Howard Jones 10 tenths Join Date: Jun 2002 GT40: San Francisco Bay Area California USA Posts: 1,884 Rep Power: 25	Re: R21 Gearbox cooler First bit of data came in today. Outside air temp about 70F. Ran car down freeway about 15 mins at 75-85mph. Got off freeway and ran through Niles Canyon at relative slow speeds (traffic) for about 10 min. Oil temp in gearbox at this point without running pump yet aprox. 125F. Turned off Niles and onto ------- canyon (testtrack) ran pretty hard for about 10mins in 2nd and 3rd gear. Engine speeds up to 6K a few times in second and 5K in third. Oil temp in gearbox now 180F ish. Ran pump/cooler for about 2 more mins at same pace. Oil temp in box down to about 160F. At end of (test track) 5 min later Oil temp in gearbox remained at 160F ish. It's really gonna take a long hard hot run to get above 225F or so. Not hot enough air temp yet to really see how good this works but it does work. I should note that the temp sensor for GB oil is in drain hole fitting. I made a big "T" fitting that get good circulation around sensor as oil is pumped out of box. Sensor is selected when pump is on. Otherwise I use the gauge to read engine oil temp. No leaks all well.