IV-Rotor Build: 12 plugs/ 9 bearings/ 8 ports = 1 monster by GtoRx7

Now onto the 4-rotor! After all that is what everyone wants to see. 1st off the aluminum side housings. So light, so nice. 

The ultra-light rotors 

P-port all epoxy sealed 

All the new seals. Too much time in clearancing side seals. I always dred it

Super lightweight rotor assemblies. 9.7:1 compresion, but almost 1lb lighter. Balanced to .2 grams of the counterwieghts. Needed for spinning possibly to 12,000 rpm! 

The ultra ultra lightweight clutch and flywheel. 4.5lb flywheel and 9lb clutch. Alcon makes one sexy setup 

[b] The IV-rotor housings next to the workhorse 3-rotor semi p-port housings.

And of course, the triple spark plugs. 

Some of the machine work for the center stationary gears 

I wanted to save weight everywhere possible, and also make our 4-rotor look more "factory produced". So I shaved the center irons, which took some time to do. 

As stated earlier, there are SO many things inside the engine that I cant photograph unfortunately. The intake ports, the exhaust ports, internal cooling methods. All this made taking engine assembly pics impossible. Sorry guys! Here she is all finished and assembled. 

I made a fast custom engine stand to assemble the beast. Took a minute to think of a good way to do it. 

The drysump plate all bolted on and ready to scavenge some serious oil 

Temporary waterpump installed, front drysump pulley, custom trigger wheel for the electromotive 

Think that is enough mag sensors? lol 

Coil mount finished (12 coils..... whew) And the slide throttle fully machined and finished. The slider is out, while I fabricated the intake manifold. 

Does this look like a machine or what?? The R26b would be proud. Notice the very straight shot intake manifold. This was the reason for all that chassis modification. 

Wanted a nice lightweight alternator relocation bracket, so designed this one. All cnc of course. The aluminum front irons do not have any bolt provisions, so mounting brackets are little more difficult. 

This is an endurance engine through and through, so I had to think out extensive planning on cooling methods. Having 1.5 years timeframe, it gave me time to come up with very clean and creative ideas. Here is a pic showing all the coolant feeds, and oil feeds. Once nice tight package considering there is 15 lines there! 

CNC oil port plugs. Had "DAR" cut into them. Defined Autoworks Racing of course  

Had to go old school on this one, the ITB airhorns were anodized the same green as my very first 20b back in 2004. 

Another challenge was the variable intake. Uses metals that cant be welded, so I had some split flanges cnc cut. Notice the counterbore, this gave 1/4" more travel on the intake. 

Originally I had a goal of the 4-rotor being only 20lbs heavier than the 3-rotor it replaced. Once I started to weigh individual items I estimated 5lbs might be possible. The end result of all that work and special lightweight items?? 6lbs. That is correct, this 4-rotor is 6lbs heavier than my previous 20b, which is pretty damn light already! I'll post some weight scale pics sometime soon