4-Rotor FC Build
10-28-11, 02:09 PM
#1
4-Rotor FC Build
Finally I've started on my build. After thinking about building a 4-Rotor for a long time I finally disassembled a few n/a engines I had lying around and started work. It's not purpose build for drifting or racing or anything, I'm pretty into fabricating my own parts, so this is more of a hobby project to keep me busy than anything else. The chassis is a basic red S4 FC, with Tein HA coilovers and SSR Type-C wheels. It's not the most pretty thing ever, but I don't mind. I'm not going to do anything outrageous with the chassis, just make sure the suspension and everything is in good condition, maybe remove some of the interior like the back seat's you can't use anyway but that's about it.
Now for the interesting bit, the engine. I can type out a really really long story about the engine, but I'm just going to let the pictures speak for themselves. All these pictures were taken within the last 6 weeks:
Now for the interesting bit, the engine. I can type out a really really long story about the engine, but I'm just going to let the pictures speak for themselves. All these pictures were taken within the last 6 weeks:
10-28-11, 02:11 PM
#4
http://www.youtube.com/watch?feature...&v=UDCborFfCmU
Progess so far, the e-shaft is coming along great, need to drill the final holes tomorrow, so the shaft can go out for heat treatment.nThe rotor housings are also coming along well, the ports are all in, need to add some epoxy in the water channel near the intake port though. I'm also planning some further modifications to the housings, but I need fuel injectors for that so I have to wait for the ID1000's to get here before I can continue with that. No worries though, lots of stuff to do in the meantime.
The following users liked this post:
boovood (05-31-23)
10-28-11, 02:36 PM
#8
I need a new user title
Join Date: Oct 2005
Location: Yaizu, Japan
Posts: 2,646
Likes: 0
Received 0 Likes
on
0 Posts
Interesting exhaust sleeves. I'm very curious how that will turn out. Also, I see GSL-SE/RESI rotor housings. Any particular reason for using those rather than the more readily available later style housings?
Can't wait to see how you do the center stationary gears.
Edit: I just noticed the slide throttle. I've been wondering how a slide throttle right up close to the ports like that would work out. Are you going to use round holes or teardrop ones?
Can't wait to see how you do the center stationary gears.
Edit: I just noticed the slide throttle. I've been wondering how a slide throttle right up close to the ports like that would work out. Are you going to use round holes or teardrop ones?
10-28-11, 03:29 PM
#11
Engine, Not Motor
iTrader: (1)
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes
on
91 Posts
Very nice. It must be wonderful to have a machine shop at your disposal. 
I'm wondering why you chose that design for the exhaust sleeves? Mazda created them in the shape they did so that the gasses could rapidly expand once they exited the port. I'd expect a smaller design would be a fair restriction at higher flow levels. About the only engines that Mazda had such narrow sleeves on are the 20B and 13B-RE, which are designed as low/midrange engines.
Those are FC housings. Earlier housings have coolant o-ring grooves in the housing. As does the Renesis.
I'm wondering why you chose that design for the exhaust sleeves? Mazda created them in the shape they did so that the gasses could rapidly expand once they exited the port. I'd expect a smaller design would be a fair restriction at higher flow levels. About the only engines that Mazda had such narrow sleeves on are the 20B and 13B-RE, which are designed as low/midrange engines.
Those are FC housings. Earlier housings have coolant o-ring grooves in the housing. As does the Renesis.
Last edited by Aaron Cake; 10-28-11 at 03:32 PM.
10-28-11, 04:15 PM
#13
Interesting exhaust sleeves. I'm very curious how that will turn out. Also, I see GSL-SE/RESI rotor housings. Any particular reason for using those rather than the more readily available later style housings?
Can't wait to see how you do the center stationary gears.
Edit: I just noticed the slide throttle. I've been wondering how a slide throttle right up close to the ports like that would work out. Are you going to use round holes or teardrop ones?
Can't wait to see how you do the center stationary gears.
Edit: I just noticed the slide throttle. I've been wondering how a slide throttle right up close to the ports like that would work out. Are you going to use round holes or teardrop ones?
The slide throttles will have round holes (or, well with a small cutout), because the peripheral port inserts in the rotor housings are round, and the intake manifold is also round. I'm going for uninterrupted laminar smooth flow here.
Very nice. It must be wonderful to have a machine shop at your disposal.
I'm wondering why you chose that design for the exhaust sleeves? Mazda created them in the shape they did so that the gasses could rapidly expand once they exited the port. I'd expect a smaller design would be a fair restriction at higher flow levels. About the only engines that Mazda had such narrow sleeves on are the 20B and 13B-RE, which are designed as low/midrange engines.
I'm wondering why you chose that design for the exhaust sleeves? Mazda created them in the shape they did so that the gasses could rapidly expand once they exited the port. I'd expect a smaller design would be a fair restriction at higher flow levels. About the only engines that Mazda had such narrow sleeves on are the 20B and 13B-RE, which are designed as low/midrange engines.
I think it will be fine, there is another topic about it here:
https://www.rx7club.com/rotary-car-performance-77/custom-exhaust-sleeves-explained-120200/
I also looked at the 26B exhaust inserts, they also aren't as large as you would think. This is not a turbo where you need to cram a lot of energy through the exhaust channels.
10-28-11, 04:20 PM
#14
I need a new user title
Join Date: Oct 2005
Location: Yaizu, Japan
Posts: 2,646
Likes: 0
Received 0 Likes
on
0 Posts
Well, I stand corrected, but those are the weirdest looking S4 rotor housings I've ever seen. Must be a Europe thing. I just saw the smooth castings and oil injection holes and assumed GSL-SE/RESI. Now that I look closer I can see the lack of coolant seal grooves, but otherwise they look exactly like GSL-SE housings except for the emissions tubes by the exhaust ports.
