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
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.
Ah thanks for that I was wondering if they stopped making the engine . On a track the RX7 mK 1 seemed very quick
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
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
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
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...
Oh, you can buy 20B motors ok still - or you can have a short cranker built for a lot of $$$$\'s :)
Plentiful. Carl even has one in his living room :)
Pip at WGT has a nice 20B race car for sale.
QuoteOriginally 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...
QuoteOriginally 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 ?
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.
QuoteOriginally 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.
QuoteOriginally posted by bill shurvinton
Already worked out quite a few of the issues with that.
\'issues\'??
Mine\'s nearly built! :rollin
QuoteOriginally 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
Ahhh, we have to have some secrets Maxim ;)
*thread hijack*
Speaking of the missus, is she good to get a lift at least part of the way to Trax in your motor? I think I can get her to shotgun to the M25 (if we go that way) in the red car but she wont do the trip to silverstone in it! :rollin
*/thread hijack*
QuoteOriginally posted by 20B_boy
Ahhh, we have to have some secrets Maxim ;)
*thread hijack*
Speaking of the missus, is she good to get a lift at least part of the way to Trax in your motor? I think I can get her to shotgun to the M25 (if we go that way) in the red car but she wont do the trip to silverstone in it! :rollin
*/thread hijack*
No worries :)
QuoteOriginally posted by 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...
Hi Rich,
The 13G engine had almost exactly the same dimensions as the 20b with the thick plate too.The only thing that made "Oh so very" slightly shorter is the front cover area being a little more compact.
Mazda them selves have NEVER made a shorter block.
Kind regards
Carl
Uggh, my bad - its been a while since of read about any of the \'exotic\' motors; I did think about that for a while too - shouldve checked it out - apologies. What sets the 13G apart from the 20B then? Were all 13Gs dry sumped out of interest (does that explain your shortly shorter length)?
As we are on the subject of multi rotors - how\'s the 4 coming on?
QuoteOriginally posted by 20B_boy
Uggh, my bad - its been a while since of read about any of the \'exotic\' motors; I did think about that for a while too - shouldve checked it out - apologies. What sets the 13G apart from the 20B then? Were all 13Gs dry sumped out of interest (does that explain your shortly shorter length)?
As we are on the subject of multi rotors - how\'s the 4 coming on?
Hi Rich,
Yes they were/are all drysumped.
That is why they are slightly shorter.
My quad is coming along nicely thanks,how\'s your triple?
Kind regards
Carl
P.S. Friday should be good!Tim has torn his engine down and ported it more and rebuilt it!So between Him and Geff they should make some pretty major improvement.
Let\'s hope someone get\'s a 10!!!!!
I presumed the dry sump explained the length - do you know how much the mazdaspeed/racing dry sump kits go for these days? any others worth looking at?
Yes, tomorrow should be fun; Tim\'s had lost some compression so was off to rebuild her whenever it was last week I saw him at geffs; he said he was going to port her out some more this time :)
I think Geff is scared :D Both cars should have a real advantage over their previous outings though (and no, NO GAS in geff\'s case tomorrow), I really hope one of them does it - I will hopefully have the camcorder there to record it if it does happen...
I wonder if Brian will take his T51 up - should go alright!!
Re Minis one was at Santa Pod last weekend with a turbo ? engine ran 10s if my memory serves me right
Pace do a good pump for the rotary (which I have on mine). You need to get some fabrication done, but the whole thing should cost around £600 for the engine, then obviously £££ for the tank and shiny aeroquip hoses.
QuoteOriginally posted by bill shurvinton
Pace do a good pump for the rotary (which I have on mine). You need to get some fabrication done, but the whole thing should cost around £600 for the engine, then obviously £££ for the tank and shiny aeroquip hoses.
Do you have any pics at all Bill? sounds very reasonable £\'s...
Have a look in the \'other rotary\' forum, some pics there. I can take more if really interested.
Just realised I need to get up in 6 hours so nighty night.
Bill
Will have a butchers tomorrow - up in <6hrs too :(
Ta,