man we brought 5 sirio EVO2 here to Brazil.... and all engines came with problems of wearing too fast the engine!!!!! just one race and all the engines had no compression at all!!!!! its amizing!!!! each of the guys used different procces of break-in....all of them have failed!!!! should we give it back to trinity!!!! i have to say that im really angry with this engine!!!!!

Fura, what process for break-in did you use, and what fuel.
What temps where you running, how was compression set (shiming).
I have a Sirio Evo2 for 3 months now, and after changing my conrod, have no problems with it. Yesterday I placed second in our local championship race and the engine is still tight and well.

Wan't to know this, because I was planning on buying a second
Evo2, and maybe ther is a batch of bad engines from USA.
AFM

Helpfull Tips on Sirios
 

Hi guys, for your records below is the official answer I got from the factory concerning conrod life for the Sirio S12. Also I did measurement to crank pin on a new stock engine and found that it has 4.428mm.

"The right play between crank pin and conrod bushing is 0,04 - 0,05 mm. I don't know if you're able to check it, but I suggest you change the conrod every 2-3 hours running.
The life of the conrod depends mainly on the fuel you use, as the lubrification and the right carburetion keeps your engine running well for long time."

Regards,

ANDREA ROSSI
Lavorazioni Meccaniche srl
Via Meucci, 3 Seggiano di Pioltello Mi Italy
Tel +39 0292160235 Fax +39 0292160581
Visit our Web Site at :
WWW.STAR-MOTOR.COM

From calculations about conrod life, according to Sirio factory, one should change the conrod between 0.4756 to 0.7133 gallon.

How come??? Well, if a 75cc tank lasts an average of 5 minutes, one makes 12 tanks in 1 hour, which is 900cc. So according to Sirio that says change conrod after 2 to 3 hours running, that means change conrod between 1800cc and 2700cc of fuel. Now if 1 gallon has 3,785cc, that means the lifetime of the conrod is less than one gallon.

BREAK-IN

After reading a post by Andrea Rossi in the Sirio's web site, this is the correct Break-In procedure for the S12's

1.- One (1) tank in the bench at WOT with very rich setting of HSN, avoiding it to go on 4 stroke.
COOL DOWN
2.- Three (3) tanks on the track with very rich setting of HSN, and tuning the HSN at the end of third tank to get almost full power.
COOL DOWN
He says after that, the engine will give more power after every new tank.
3.- For 20% Nitro, use .20 head shim and N° 7 Glow plug.

Which means that Break-In should be done with more or less 300 to 500cc of fuel.

AFM

i am also looking for a evo 2 any info is good for me to have!

hi , my engine was broke-in with 3 tank of sidewinder 16% nitro of full trotlle and 80c temperature.... and 1 colplete tank on the the so i started lean it out...... the engine last one race!!!
the other one was broke-in 5 tanks of byron 16% o iddle anmore 2 tanks on the track and started lean it out.... last ine race....
the other one with 1 tank of full throtlle and two on the track with novarossi 10%!!!! one race long!!!!!!!! the other two i dont know how the broke the engine in... all know is that the engin didnt last more than 2 races!!!!!!!!!!amaizing... i think all the engines that came here came with problems!!!!!!!!!! fuck!!!!

That is very strange. Have you posted your problems with Andrea Rossi at Sirio's web site, because it could be a a bad batch on the USA market.
I bought mine in Spain and has allready 4 races on it and still runs like hell. It is the fastest engine I've had up to now.

What are the symptoms. They don't perform well any more??? Hard to tune??? Doesn't hold Idle??? Overheats ??? You can move piston without resistance or pinch towards TDC???

AFM

It is realy sucks!!!!!!!!!!:nod:
I will never buy Sirio even after first engine, not to wait for 3.

They were different drivers with same problem, not one.

There's something wrong there. I have my Sirio after 4 races and is running better everytime.

AFM

Three different drivers, but problem is the same. So we can't claim someone make the same mistake-all three drivers can't make the same mistake. Only one thing left-engine.

I wouldn't jump on a terminal conclusion like you do TG, it would be the same if I said i have terrible experience with your Palmaris engine. Don't forget you are a manufacturer and it is not seriuos to comment like that.
I think we must make more serious analysis before bashing a brand of engine.
You know better than anybody that Breaking-in at WOT, if not done correctly can damage any engine, and maybe that is what they did wrong.
Here at my track there are several drivers with Sirios and nobody has had that kind of problems.
Lets have more caution on critizising an engine and not create panic among users because of somobody's bad experience we haven't lived or seen personally.
Or are you trying to "divert water to your well" ???????

AFM

Does anyone know if you can just get the venturi insert ( the chrome piece) seperately on the Sirio 12TRP carb. If so, let me know where to pick it up.

At Tower Hobbies:

http://www2.towerhobbies.com/cgi-bin...=SIRIO&S3=&S4=

They only have stock in 5mm and 6mm, and if you wan't it on 5.5mm you could just drill the 5mm one to that size.

AFM

Thanks, I got my local hobbyshop to order one for me.

Next Question: Does the Original Sirio .12 Conrod fit the
New ev02 as well? I have both a turbo button
and new conrod and am thinking about
getting a new EVO2 if these parts are
compatible.

Yes they are compatible.
afm

How does the EVO2 compare with the newer Novarossi engines?

It is at par with them (stock). Sirios have different powerband and emphasize top end. You need to understand that and normally have to gear them a tooth shorter in 1st speed and equal or some times a tooth taller in 2nd gear, than tha Novas. The right pipe is also important, they work very well with their own pipe, and others have had good results with the Novamega TPO4.
Allround they are very good engines for the Money. Mine runs as fast as the Novas at my track, and this last Sunday I placed second behind an RB Rody Tuned, and actually lost because he was better driver than me. But hey!! my engine costs $199.00 and the Rody is $340.00.
AFM

I'm currently running a Sirio 5 port AAC outlaw, so I know that their power is in the higher RPMs.
I just wanted to see how the newer engines are.
Is there a noticeable difference between the new outlaw engines, and the older ones?

There were at least 2 different drivers and 5 engines total. Fura Fura had 3 engines which all only lasted 1 race and there were 2 other engines which only lasted 2 races.

Regarding Sirio. Its possible that the engines in South America where all Mk1. They were reknowned for having serious problems and not lasting any length of time. Sirio denied anything wrong with the engines. But the conrod was so obviously weak.

Its quite possible you got one of the Mk2 engines which mysteriously are far improved and dont have the same reliability problem relating to the conrod.

How are the new carbs on the EVO2?
Are people still swtiching out the carbs for Novarossi carbs?

Actually they were engines bought in the USA (Trinity*&%$)

I bought my engine (Sirio S12 Evo2) in Europe (Spain) on October 2003, and didn't come with the new big blue cooling head????
So you are saying there are two batches of Evo2 engines???
How do we know which engines are MK1 or MK2.

AFM

Not anymore, Evo2's come with the new improved 3 needle carb, and as far as me goes, it is the best carb I've had so far. I even use it on my back-up/training engine, which is an RB X12.

AFM

I can't tell you that. My engine is a 3 port ABC, and as far as comparing it to the old 3 port Sirio, yes it is by far much faster.

AFM

AFM
 

would you recommend a novice to break in a evo 2 5 port??

Re: AFM
 

Hi ther Gent

Did you finally got yourself an Evo2 5 ports???? Why not Break-in any engine is the same, being an expert or a novice.

Any way following is the correct procedure for Break-In a SIRIO. I know you don't have a bench, but maybe somebody at your track or local, hobby shop might have one to lend. At any rate Break-in should be done between 90°C to 100°C maximum.

BREAK-IN

After reading a post by Andrea Rossi in the Sirio's web site, this is the correct Break-In procedure for the S12's

1.- One (1) tank in the bench at WOT with very rich setting of HSN, avoiding it to go on 4 stroke.
COOL DOWN
2.- Three (3) tanks on the track with very rich setting of HSN, and tuning the HSN at the end of third tank to get almost full power.
COOL DOWN
He says after that, the engine will give more power after every new tank.
3.- For 20% Nitro, use .20 head shim and N° 7 Glow plug.

Which means that Break-In should be done with more or less 300 to 500cc of fuel.

AFM

hopefully i'll be breaking it in next week some time, but like i said the conrod posts and the fued you had with palarimis or what ever the name was just makes me want to make sure i break it in right, i dont have the money to kill a $200 motor. your advice has been the best!

Congratulations, welcome aboard Sirio's world.
You are right, just take your time and do it right, and you won't have problems, and if you do I'm here to give you adviceThakks for the compliments.
By the way, what fuel are you going to use??? I use Byrons 20%, very good fuel.
AFM

afm, perhaps the reliability of your Sirio engine has got to do with it being ABC instead of AAC? The engines that Fura Fura mentioned failing... Are they ABC or AAC?

So if one were to get the 5 port EVO II engine, which one now? ABC or AAC?

Good question "D" Something to ask Fura Fura when he answers some questions I've asked him a couple of posts back.

Any way, when I asked my contacts in Spain before buyin my engine about which one to get, they said to me to stick with ABC, that AAC was not being used by official drivers at the European Champinoship last year in Portugal, and that for the Pre Worlds in Brasil official drivers were going to use ABC, and they did, and won. That told me it was best to stay with proven technolgy, and let somebody else be "guinea pig". My decision has proven me right.
Got the official time results from this Sunday's race and the winner U$ 340.00 RB Rody Tuned engine stablished new track record at 24.045 secs, and I made second best time with my $200.00 Sirio Evo2 AFM Modified at 24.077 secs. That's only .032 secs. difference, which I admit is because he is a better driver than me, he has a Kyosho Evo, and I have an old Yokomo GT4

I think Sirio engines, properly tuned can give you exelent run for your money.

AFM

I am currently running the new EVO2 AAC and the engine powerband is good and run well. You may have to drop the pinon a little as the engine have good rev. I have been running Sirio AAC (the first genration) and they seem to last longer and run better than my buddy Sirio ABC. How long the engine last and perform really depend on how the engine is break in, tuned and geared.

all i can tell is that im really angry that i spent my U$$200 on Evo2 and they are like 2year old compression.... with only 1 race!!!!!!! and yes... we use only ABC ..piston and sleeve...

Fura Fura,
Have you contacted Andrea Rossi from Sirio???
You can access Sirio's web page and under "contact", send him an e-mail explaining the whole problem, detailing your break-in process, fuel used, settings, temperature while braking-in, during race, were you bought the engines, a serial number from the box or engine (if any) etc.etc.
He always answers all mails and gives great support.
I'm sure there's got to be an explanation to what happened to you guys. It is not normal for any brand of engine to wear out after 1 race, if properly broke-in and tuned.
AFM

so do the evo 2's come in the aac or abc sleeves?

From what you see at Sirio's web site, seems they are only working with ABC now, but they use to make AAC engines in the past, but haven't seen one on the Evo2 series.

Check it out here

www.star-motor.com

AFM

Yes, the EVO2 5 ports have both ABC and AAC, I am currently running the AAC version in my FW05R, I have run about 3/4 gallon on it and the engine still feel tight at TDC when cold. My last AAC still feel tight after 4-5 races (with average runtime of at least 90 mins per race), Temperature after 45 mins main is about 120-130 deg.

which is more durable and isnt that a very low temp for a motor to run at?

He is talking about Centigrades on temp.

Good question on durability, and may I add performance between AAC and ABC Evo2's. Who has the answer having raced both????

AFM

Anybody have problems with the Sirio .12 engines rod? Mine lasted less than 10 tanks!!!!!

Yes; mine lasted just as long!

Hmmm with all this talk with the sirio conrods.. I am starting to wonder, my bushing wore fast, I blamed it on being too lean but maybe it was the engine?!!?

My Sirio had over a gallon thru it with no problems...