Pictures of my MazdaRX8 Slant project

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It will certainly have more torque! And more reliable.
Those RX8 had a lot of engine issues . The old 13B was a great engine and ran like a scalded cat in R1 and R2 RX7s with turbos . I put thousands of miles on them when I sold them .
 
Speaking of Mazdas . This is my 92 B2600i LE that I redid a few years ago . Only has 108k on it but I went thru everything just in case . Color keyed the grill and fender flares when I painted it .

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Clever location for the crank trigger. I set up one on the front and it takes up enough clearance to be annoying.
 
The rotary in the 2004 RX8 is all cast iron. Mine weighed 240 when I pulled it out. My slant weighed 470. So 230 more pounds. But as I said, a lot of parts came out that will no longer go back. Two huge oil coolers, lines and brackets. Lots of plastic, wires, emissions crap, on and on. About 100 pounds altogether. Then when the battery goes in the trunk it moves about 50 pounds from front to rear which restores the balance of the car. As far as power goes, the 1.3 rotary maxxed out at 238 HP-not 400 HP. I hope to get 200 HP from my slant. And the slant will far exceed the torque of the rotary at maybe 250 vs the rotary at 159. The car should be much quicker even with a mild build. We shall see.

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Thanks for your questions. The wood you see was the original fitment adapter model I made. I made the bottom of it flat to keep the engine and transmission square, using the Mazda crossmember as a guide. I made it out of three pieces of 3/4 plywood. One piece bolted to the transmission and two pieces bolted to the engine. So 2.2" total. ( 3/4 plywood is not quite 3/4). I had to use a larger spacer than I wanted to keep from cutting itno my firewall. I found the center of the crankshaft and the center of the transmission (using the back plate of the rotary engine case) then bolted the two together. Sorry about the bad pictures. Eventually I made the engine to tranny adapter out of billet aluminum I bought as drop on Ebay. 2.2 inches think. I was very careful to get the exact centers correct. They are within .002. The Mazda clutch is 240 mm which is 9.45". I cut down a 12" cast flywheel to make it have the same dimensions as the Mazda rotary flywheel. The ring gear, pilot bushing and clutch dowels and bolts are Mazda. The starter on the Mazda is mounted in the transmission so I had to fit the Mazda ring gear to the back of the Chrysler (now Mazda) flywheel. So the car thinks everything is Mazda. Clutch release and everything is Mazda. Everything from the face of the flywheel back is all stock Mazda. With the Haltech ECU it all plugs and plays. I cut the second v belt groove in the harmonic balancer so that both grooves were the same. For whatever reason they were two different sizes. I can now use a two groove Delco alternator and two groove PS pump and a two groove small block Chevy water pump pulley (modified). The PS pump is from a Miata. Two belts for the alternator, water pump, and PS pump. The AC compressor will be a Sanden run by one belt.

You may ask "Why would anyone do this?". I like to tinker and make things that are unusual. I wanted a modern car with electric windows and airbags. The slant fits right under the hood. It has about the same horsepower as the Mazda. The weight is near the same (late model slant is pretty light) so I won't need to change any suspension or driveline. I did change the transmission from a 6 speed to a 5 speed to get a better overdrive. I may have to change the rear end gears eventually. I calculated that I will be running 2704 RPM at 75 mph. I want to take it to the car show and people not know that it isn't factory. Thre are plenty of people making drifters from the RX8's. I don't care anything about that.

I'll keep you guys posted as I move along.

Kenny

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The wood mockups are sheer genius.
 
Yeah, shoulda done a 318. :icon_fU: RRR I seen your tagline.
All you clowns hating on the 318 are wrong.
ive seen front tires come off the ground with 318s and 6 bangers....all it takes is good math and a fat wallet.......ive had many 318s.........all good engines...as long as timing chain and gears where replaced..mpg was very good....a guy in missoula mt was a 318 nut....built them no issue to 400 hp but he used many chevy parts....pump gas...he said...there is not a better built sb then the 318..i think he ment after he was done with it.....for me.....gas engines are never my choice for power....speed yah ok...the 225 slant.....great little engine......
 
I believe your math is off. A iron slant is not light by any means, and if it's a stock slant, it will have about 105 hp.
I weighed my slant when I pulled it. 437#. I don't know what to tell you. Did you weigh yours? I'm not leaving it stock. Oregon cam, Gill Welding fuel injection intake, Dutra Duals with Gill Welding exhaust, six LS coils, Haltech ECU, head work, etc.

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what did the alloy slants weigh
were they all junk or could they be fixed
cool build ...would think header/alloy intake would shave 30lb
 
Rotor is kinda cool
But junk..never thought a slant would fit
 
Nice build I like it. Is the transmission shaft long enough to fit into the clutch plate
 

Nice build I like it. Is the transmission shaft long enough to fit into the clutch plate
I Made a 2.2" engine to trans adapter then an appropriate flywheel adapter, 2 inches plus or minus so that the transmission sees an identical situation as it had with the rotary. I would like to shrink the adapters to something smaller in the future. That will require a spacer between the bell housing and gear box and a longer input shaft. A future project.

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I weighed my slant when I pulled it. 437#. I don't know what to tell you. Did you weigh yours? I'm not leaving it stock. Oregon cam, Gill Welding fuel injection intake, Dutra Duals with Gill Welding exhaust, six LS coils, Haltech ECU, head work, etc.

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I Made a 2.2" engine to trans adapter then an appropriate flywheel adapter, 2 inches plus or minus so that the transmission sees an identical situation as it had with the rotary. I would like to shrink the adapters to something smaller in the future. That will require a spacer between the bell housing and gear box and a longer input shaft. A future project.

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