I've seen a four rotor up close and personal. We (MOCA members) live about 20 minutes from Jim Downing's race shop. Retired Mazda LMP racer, inventor of the Hans device used my many racing sanctions, and one of hte pioneers of using a four rotor in racing (that wasn't Mazda). From what his shop guys have told me the four rotors they used are not 2 mated 13bs, but a whole engine supplied by Mazda.
At the track his four rotor screams like an indy car and gets spanked like my MX-3 trying to race a Venom 1000. God bless him for trying, but he couldn't get that car to run for crap.
I know, I know, I'm a bad a-- photographer
This pic was his last ever race at Road Atlanta 2003, he came in 3rd out of 3
ZE -strait neck,headers,2.5 exhaust,pheno spacers,lower cross member,GC coils,MS struts,Brembo slotted rotors,filled MS mounts,SS brake/clutch lines, CAI,to rear bat reloc,Hella headlamps,Hella DE fogs 180WHP
The 4 rotor is an awsome piece of machinery. I've seen won up close and personal from that car pictured above. When I asked what was involved in a 4 rotor, it's basically a custom engine built from the ground up. Truely amazing and there are only a few of them in the world for motorsports applications.
PATDIESEL wrote:At the track his four rotor screams like an indy car and gets spanked like my MX-3 trying to race a Venom 1000. God bless him for trying, but he couldn't get that car to run for crap.
I was talking to Rob at Pineapple racing (one of the best rotary building shops in the country) and he said if you don't tune the 4 rotors perfectly you can have some big problems. He builds custom 4 rotors and whatnot for a lot of the racecars since Mazda has decided to cut back their production of them.
But Ya they have a kit to take two 13b's and put em together now. Saw it on RX7club.com a couple months back. Kinda spendy cause the essentric shafts are so hard to make, but thats the fun of it.
My brother has a 85 GSL-SE (1st gen body) witha a TII Engine rebuilt with Large Street port and overhauled. He blew a side seal before he could get it tuned but that thing was gonna be pushing out well over 400whp. My Brother wanted 450whp and that engine was built to had that reliably. Rotories are awesome!!!
Piston engines go boing boing boing,
mazda engines go vrooommmmmmm....
I'm too lazy to quote whoever said that the 4 rotor engine need to be tuned PERFECTlY. Piston engine have about 1000 moving parts, mazda's 13b rotory engine has about 40, but they can be the worst 40 parts in the world if its not done right...
I've been on a couple rx-7 forums...back when i had my FC....You guys should check it out, there are some awesome 1000 Horsepower street cars out there, I've also come across a thread where some guy did a twin turbo 4 rotor that was supposed to push more than 1500 HP
Amazing counting that Mazda designed these cars stock at about 300 HP....
BTW...that widebody kit probably cost as much as sourcing that engine stock...looool
Kokiriwave wrote:I'm too lazy to quote whoever said that the 4 rotor engine need to be tuned PERFECTlY. Piston engine have about 1000 moving parts, mazda's 13b rotory engine has about 40, but they can be the worst 40 parts in the world if its not done right...
I've been on a couple rx-7 forums...back when i had my FC....You guys should check it out, there are some awesome 1000 Horsepower street cars out there, I've also come across a thread where some guy did a twin turbo 4 rotor that was supposed to push more than 1500 HP
Amazing counting that Mazda designed these cars stock at about 300 HP....
BTW...that widebody kit probably cost as much as sourcing that engine stock...looool
They need to be tuned Well if you want any power out of them. That is the thing with rotories, You can have a engine capable of 700+ HP but with lowsey tuning you can have only 400hp. There are a couple threads in the single turbo section of guys baseline dynoing at 350whp and ending up with 750whp at the end of the tune, tuning is everything no matter piston or rotor. But there is one thing, Pistons do last longer on bad tuning then Rotories...
at Road Atlanta 2003, he came in 3rd out of 3 
