Quote:
Originally Posted by KTL
Here's a picture of the thermostat cut open. You can see the path through the thermostat is a bit convoluted. Picture credit goes to Grady Clay, RIP fine sir
And here's some additional details on how the thermostat works
http://forums.pelicanparts.com/porsche-911-technical-forum/927332-how-external-oil-thermostat-works-illustration.html
And thanks for the correction by 76FJ55 regarding the pressure at the dead end when the thermostat is closed/cold.
Also note that the t-stat can be in open mode all the time. They do sometimes stick closed or stick open. I had one stuck open on my '87 Carrera and I have to assume when the oil was pretty cold the bypass passage was being tested. I could hear the oil gurgling in the oil lines on the passenger side of the car after startup |
Kevin,
With all the information you have posted above, you should by now realize that there is no flow restriction caused by the auxiliary thermostat at anytime during its operation as you claimed. Find or locate a point or spot within the thermostat that is smaller than the cross sectional area of "A" to cause a flow restriction. You said you think there was flow restriction for the oil flow from the scanvenger pump going to the auxiliary thermostat and interested to know where.
I had done some tests and measurements of the auxiliary thermostats and found no where within it to have a reduction in cross-sectional area along the oil paths starting at point "A" (oil inlet to aux. thermostat). BTW, measure the X-sec. area of the inlet and the oil line/s and compare because I've done my homework. Share your finding.
We could argue and contradict, but at the end of the day, we should still stay as friends. I highly value your knowledge and experience. Thanks.
Tony