Best Normally Aspirated Engine for the RX8

[clive]

AS regards exhaust manifolds, Racing Beat do one for the RX8 that will only fit LHD.  If you\'re getting a continental one then why not go for this!

Steady, nobody knows if the Racing Beat will fit RHD yet, not even them,

I have told Racing Beat that I am sure this manifold will clear the steering rod and when they are avaliable I\'m going to try one on my car for them .

[RxRebels]

Thanks for the support guys, it\'s encouuraging to hear that 300 bhp is achievable within the sound constaints. It sounds as though our project is achievable, succesfully I hope! :eek
 
It\'s all this porting stuff that gets confusing, peripheral port, parallel port, bridge port. Everybody seems to think each one of them is the way to go??? Am I correct in saying the 13B-Ren is a peripheral port?
 
The engine is my primary concern if we can get the right kind of power we need everything else can be knitted together as I am confident the rest of the package will be excellent.  The engine will use FIA homologated fuel (102 Ron)
 
Can anybody tell the spec of the engine in the link below:
http://www.youtube.com/watch?v=I9WXEQpvdQk&feature=related
 
 
Here are the engine reg\'s:
 
 
"Touring Cars Group A with rear-wheel drive and a normally aspirated engine, conforming to Appendix J Group A (Articles 252 to 255).


The Cylinder capacity is limited to 2000cm3, the engine can be turned 90 degrees to transform from front to rear wheel drive. The engine is free but the engine block must be from a model of car of the same original registered trademark as the cars original bodywork.

Variable Valve Timing is not permitted
Variable Length inlet trumpets are forbidden
Titanium is not permitted except in connecting rods, valves, valve retainers and heat shields
The use of magnesium is not permitted in moving parts
The use of any ceramic component is forbidden
Internal and/or external spraying or injection of water or any substance whatsoever is forbidden (other than fuel for the normal purpose of combustion in the engine)
The use of carbon or composite materials is restricted to clutches and non-stressed covers or ducts.
Only a direct mechanical linkage between the throttle pedal and the engine load control device is permitted.
The tunnels used for the passage of the exhaust must remain open to the outside along at least two thirds of their length."


Does anyone see any stumbling blocks with the above reg\'s and achieving 300 BHP from a 13B Ren.


Rx Rebel.

[Will66]

Steady, nobody knows if the Racing Beat will fit RHD yet, not even them,
 
I have told Racing Beat that I am sure this manifold will clear the steering rod and when they are avaliable I\'m going to try one on my car for them .

 
Aha, but RxRebel said he was gonna go with a LHD car as the base for his track car, however if he goes peripheral port it\'s a moot point anyway since it won\'t fit.
 
As for the RX8 engine (13B-MSP) is not peripheral ported, all its ports are on the side faces of the rotor chambers.  It\'s to do with efficiency rather than power.  Peripheral Ports are on the rotor housing (the outer edge of the chamber, the surface on which the apex seals run) and allow for large ports and big power.  The RX8 rotors are lighter than the RX7 ones and have more upmarket seals I believe.
 
I\'d take your spec to a reputable Rotary Builder, Hayward Rotaries (since Carl Hayward has posted in this thread) for instance.  I\'d love to see an RX8 racing with that kind of power N/A.  My quest for similar oomph will be coming from some form of forced induction I\'m afraid since mine is a road car and my daily driver currently, although may become weekend warrior.

[clive]

Soory Will but you clearly stated that the Racing Beat would only fit LHD which was not correct as not even RB know this yet!,

Sorry to correct you as nobody likes to be wrong moot point or no moot point :cheers

Even, I\'m wrong sometimes, or is it right sometimes, ah well I know it\'s one or the other :rollin

[Will66]

My bad!  You\'d think they\'d check.  LHD should be easier since there\'s no steering column that side.

[clive]

Had a quick look at the rules (below) and the first thing I can see that will be good for you is that you can aim to trim the car down to 840 kilos as it will be classed as a 1300cc

Not sure your going to quite find 300 flywheel brake but add a good ECU with the correct tuning, a good inhale and exhale system to get those two lungs working properly I don\'t think your be too far away from what you want.

Most importantly as said above, you should end up with a good package,

 http://argent.fia.com/web/fia-public.nsf/37CD0FA342778EECC12573C4003FD439/$FILE/255%20(08-09).pdf

Good luck out there

[Wankeltrim]

Can anybody tell the spec of the engine in the link below:
http://www.youtube.com/watch?v=I9WXEQpvdQk&feature=related
 

Im the builder of this engine and i put it together tho Pirkka who compete in the Norweigan rallycross season. The 2007 season the engine was running with a 51mm downdraft carb and MSD ignition and he finished 3 total this season.
For the 2008 season we made some changes on the fuel and ignition setup and the engine is now running with a Swedish made fuel and ignition system( Prospark EFi System ) and Pirkka finished 2 total this season.
This engine is using 12A sideplates and 13B peripheral ported GSL-SE rotor housings.
We use 9:7 rotors with MFR race bearings and the rotors are balanced and weight adjusted to 1 gram tolerance.
Crankshaft and balance weights are from a 13B rew and a special made flywheel with a Tilton 71/4 rally clutch ( all balanced to very low tolerance ).
Front and rear stationary gear is Rx8 that we made som changes on.
Apex seals are Ianetti ceramis 2mm 2pc seals and the other seals are Mazda oem parts.
A Mazda Motorsport high flow oilpump supports the lubrication together with a Mazda Motorsport race pressure reulator.
The intake manifold is a inhouse custom made alu intake.
Throttle body is a 51mm with 4X460cc injectors.
With this setup the engine starts to pull from 3500rpm to 10.000.
Rpm limit is set to 10300rpm but we shift gear at 9500rpm.
We dyno this engine to 320hk and 270Nm

I made another engine to a Norweigan rallycross driver ( Jan Gabrielsen ) with basically the same internal parts but this engine is based on a S4 N/A engine. On this engine we are using a 52mm Gene Berg carb and MSD ignition and we dont see any bigg differance in power and torque if we compare with Pirkkas engine. This engine finished in 3place in Norweigan hillclimbing for rallycross cars 2008 season.

If you have more question about PP engines for all application send me a email on rotaryperformance@glocalnet.net.

Regards Jörgen

Pirkka engine



Gabrielsen engine

[Wankeltrim]

Hi all!
 
Excuse my ignorance as I\'m new to the world of Rotary but I like what I see.:Thumbs-up  I am looking at using an RX-8 for Motorsport use.  The RX-8 is homologated and class rules mean I can use any normally aspirated (N/A)Mazda engine up to 2000cc/1.3 ....el.
 
I am about to buy an RX-8, is the engine in the RX-8 the best solution for getting about 300 bhp or should I be looking at buying a 13B engine from the RX-7.  Does anyone know which engines you can get the most power from reliably and finally who are the best engine builders in Europe?
 
I am aware that a lot of MK2 Escorts run N/A 13B engines.  Are these 13B engines form the RX-8\'s of RX-7\'s.  Will I have to buy both an RX-8 and then the best engine seperately?
 
I would be very greatful for any comments.
 
Thanks a mill,
 
RxRebel.

Are you thinking of the Rallycross cup rules ?
If you are not allowed to use peripheral port.
BUT there are other engines the you can use with good power and more torqe on low rpm.

[RxRebels]

Hi Jorgen,
 
I have found you!  This is good news..  I have not started this project as yet because I feel it is important to find a rotary engine builder who understands Rallycross and Group A touring car regulations for the Rallycross Cup (New Division 2).  I will send you an e-mail to see if we can make a powerful solution of the RX-8!
 
Regards,
 
RX Rebel

[Wankeltrim]

Hi Jorgen,
 
I have found you!  This is good news..  I have not started this project as yet because I feel it is important to find a rotary engine builder who understands Rallycross and Group A touring car regulations for the Rallycross Cup (New Division 2).  I will send you an e-mail to see if we can make a powerful solution of the RX-8!
 
Regards,
 
RX Rebel

I got your email and i will answer it after new year until then HAPPY NEW YEAR :cheers