Group C replica Mazda 787B
Discussion
After a very long time with no progress I'm finally working on the 787B again. No work on the chassis and running gear yet, concentrating more on the engine right now. As we all know, the main issue with my original plan was the lack of a rotary engine, however this is set to change. Around a year ago I bought a first gen RX7 complete with an engine that needed a rebuild but came with a whole load of spare engine parts. The engine in question is a 12A rotary turbo that I have fully rebuilt ready to drop into the car. During the rebuild I have measured and drawn up all the oem 12A Mazda internals, picked up some RX8/13B parts for comparison and drew them up, visited a guy who kindly let me have a look at some three and four rotor internals and and drew them all up as well. To cut a long story short (more info on the blog) I'm now at the point where I am going to start machining the parts to put together my own four rotor engine!
To start with, here are some experiments I've carried out introducing exhaust ports into junk RX8 rotor housings
Standard RX8 housing, note lack of anyperipheral ports:
Option 1, machine for steel port runner
Option 2, machine and press in raw material for creating port
To start with, here are some experiments I've carried out introducing exhaust ports into junk RX8 rotor housings
Standard RX8 housing, note lack of anyperipheral ports:
Option 1, machine for steel port runner
Option 2, machine and press in raw material for creating port
Edited by RobBiggs on Tuesday 25th April 20:35
Nice to see you are still working on it.
I've seen someone do the same with the housings before.
The "crank" is where all the real effort is though, that multi-part e-shaft is expensive or hard to make.
For those who haven't seen what goes into a 4-rotor https://www.rx7club.com/build-threads-294/4-rotor-...
I've seen someone do the same with the housings before.
The "crank" is where all the real effort is though, that multi-part e-shaft is expensive or hard to make.
For those who haven't seen what goes into a 4-rotor https://www.rx7club.com/build-threads-294/4-rotor-...
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