So, I was out playing in the local hills when things got a bit scary. I turned the Cooling fan off to restart the engine on a steep hill and I forgot to turn it back on. It was around 260 degrees when I figured this out.
Scratch one 12A Rotary. The good news is that I had already accquired a 1986 RX7 donor car for an upgrade. The new engine is fuel injected, larger and quite a bit more power. To prevent any further issues, I wanted a good, simple mechanical fan this time.
Problem: the RX7 engine/trans is too long to leave enough room for one.
Solution: Chop 6 inches out of the transmission. Not as easy as it sounds. I took it out of the tail housing, shifter, output shaft, etc. This also has other benifts such as making room for the large 13B oil cooler as well as better weight distribution.
Here is the old 12a engine and trans coming out. It's too long.
Here is the machined collar I had made to shorten the output
shaft. It has a .002" interferance fit and was heated prior to installing it over the shaft.
It was then carefully welded on both ends. (not pictured)
Here is a shot of the shortened trans installed:
...and a close up of the shifter housing after being shortened.
This is the progress so far. I still have plenty of work to go.
Oil cooler hoses fitted: Header partialy fabricated:
IT RUNS AGAIN!
In final running configuration: Fabricated Air filter adaptor and K&N filter with prefilter.
The radiator is an off-the-rack fitment based on a VW sciracco intended for drag racing.