Triple rotor RX

[paulc]

I used to be a tech in a mazda main dealer and owned a Vreg RX7 the one without the rear spoiler. I can remember a Triple rotor RX7 wining Thunder saloons unlimited power saloon car circuit racing (normally V8 saloon cars). Do any of these cars still exist and why do they not use this engine for drag racing

[gsb876]

Some people do use the triple rotor rx7\'s for dragging, just very expensive to maintain i guess. The pink panther on this forum is a triple rotor rx s is Pip gardners rx TII.

[paulc]

Ah thanks for that I was wondering if they stopped making the engine . On a track the RX7 mK 1 seemed very quick

[marcusf]

Hi there, my mechanics are running a 20B PP Turbo in a series 5 body. The engine makes 900 HP on 15PSI. The quickest run so far is a 9.66, and thats when the V8 auto transmission was slipping badly. The turbo was a T-76 and they couldn\'t get enough boost, so now they have got a even bigger turbo, not sure exactly which model it is, but its bigger than a t-88. We are hoping to get into the late 8 seconds this season.

Incidently, the engine has done 4 seasons without a rebuild, so much for rotary engines being unreliable eh ! I have great faith in the reliability of the rotary engine, and this proves it. Most people do an engine in a meeting....

The 20B is a monster engine, when it was making 600HP, it had 800NM of torque, at 800HP, over 1000NM of torque.

Its a pity Mazda didn\'t make a limited RX7 with a 20B in it, then they could really upset everyone, like they used to :-)

Cheers
Marcus

[bill shurvinton]

Just for those who are interested, 900 HP at 15PSI is a Pressure ratio of 2 near as, or an isothermal NA output of 450HP. For a 20B PP this is well within reasonable limits so a very believable output.

Yum yum.

Bill

[paulc]

The Triple rotor was a almost unheard of in main stream English Motoring circles. I worked at a Mazda dealer but had never seen one. When I saw the RX racing with a Triple I thought it may have been a Modified Twin with a one off centre shaft and extra case. I did a search yesterday and it showed  the engine fitted in a Mazda with  a saloon style body. At thunder saloon racing the  RX was against V8 Ford  Sierras and the like but they where so far off the pace with  their wheels lifting off the track on corners it was funny. The Rx was quiet for a race car and shot past with a lovely Turbo whine sound. Out of interest how would you get hold of one of these engines today

[20B_boy]

Triple rotors\' manifest themselves in both forms; \'converted\' 2 rotors or as you realise - in the shape of the \'mass production\' 20B 3 rotor as found in some of the JC Eunos Cosmo saloons that were supplied JDM-only.

Over the years Mazda has built a number of 3 and 4 rotor engines in various numbers. The 13G 3-rotor was used by raced by Mazda I think, being of the non-20B short cranked variety.

These days a number of people make custom cranks to enable the construction of 13G-esque 3 rotor engines from largely 13B parts. This saves weight as the 20B has a hunking great intermediate plate in order to house the additional bearing and provide room for the additional primary and secondary side ports. And also assists with weight distribution as the \'13G-type\' are a little shorter. The \'downside\' is the short crank motors are limited to peripheral intake ports for obviuos reasons...

[20B_boy]

Oh, you can buy 20B motors ok still - or you can have a short cranker built for a lot of $$$$\'s

[bill shurvinton]

Plentiful. Carl even has one in his living room


Pip at WGT has a nice 20B race car for sale.

[20B_boy]

Originally posted by bill shurvinton
Plentiful. Carl even has one in his living room

Me too - well not in the living room. And another one at Geff\'s...

[GaryS]

Originally posted by 20B_boy
Me too - well not in the living room. And another one at Geff\'s...

You still got one of yours in you FC3 ?

[20B_boy]

Yeah, the one at geff\'s. Not for long tho I dont think, was going to use it for some 20B testing but the car is a dogger and would need too much cash thrown at it just to make it drive ok - I get carried away every now and then with these stupid ideas - concentration on the 20B-front firmly back in the direction of the FD now

No more silly thoughts for a while.

Except for the mid-mounted 13B non-seq twin turbo Mini of course.

[bill shurvinton]

Originally posted by 20B_boy

No more silly thoughts for a while.

Except for the mid-mounted 13B non-seq twin turbo Mini of course.

Already worked out quite a few of the issues with that.

[20B_boy]

Originally posted by bill shurvinton
Already worked out quite a few of the issues with that.

\'issues\'??

Mine\'s nearly built! :rollin

[maximtaylor]

Originally posted by 20B_boy
\'issues\'??

Mine\'s nearly built! :rollin

Only two things missing.......

a) the mini
b) permission of \'she who wears the trousers\':eek