Doesn't seem like the quality control is where its supposed to be.

You are right, as a matter of fact I just came back from Spain, and talking to the Sirio rep there, he told me that in the old old TRP series Sirios, they had a bad batch of broken cranks, and apparently it was because of to much hardness on them, so Sirio changed crank hardness to a softer one and that is what we got on the first series of EVO 2's.
I just got a new Evo 2 of the last production and they say the crank is with the correct hardness.
We will have to try it and see (when my older Evo2 dies, which might be after my enduro race this weekend).

AFM

I don't think so. I would say it is a question of design and evolution. Lets not forget that Sirio is a young brand compared to others, and they've been improving their engines over time.
With the new Evo 2 engines, carb problems are a question of the past and I must say it is the best and most reliable carb i've had so far. I even use it on my Nova based engines. The crank hardness seems to have been corrected now, so I would say they do care and improve their engines constantly.
To finish, I would say that they have the right price/performance equilibrium.
I will keep using these engines because when broken in correctly and tuned correctly, they give awesome performance.

AFM

ahhh....<sighing> the typical defensive response anytime anyone questions any brand on a message board.

Look, I wasn't trying to knock the brand, just expressing my opinion based on my experience. I had to send my engine back because the engine labeled on the box wasn't what was in the box, same thing happened to two others I know of. Sounds like a quality control issue to me. Now my engine seems to be leaking air badly at the carb and is very inconsistent after starting out excellent. That, along with the other problems I read right here on this thread led me to say that. Not presenting it as absolute fact, just what it seems to me.

I can't speak to the corrections made with the EVO2 (but my buddy seems to like his), cause I don't have one. All I can comment on is what I have personal experience with which is the 12TRP w/blue head. And when there are wrong engines in sealed boxes and carbs that develope problems 4 months after purchase, it seems like quality control issue to me.

I'm not telling anyone to stop using the engines or that Sirio doesn't care, just pointing out that there are some issues there that they need to address. Perhapes ones (as you say) they have already addressed with the EVO2. But that doesn't exactly help me with my original 12TRP.

Sorry if I offended anyone by daring to question Sirio's quality control. But from my personal experience, and from what I have read here, I have legitimate reason to.

Jezzz...

I'm hoping this reseal job I've done on the engine will do the trick. Unfortunately I wont be able to find out until I finish moving to my new place.

I'll try it with just the engine resealed first, then if that doesn't get results, I try replacing the tank too. If all that doesn't work! ....Uhhh...I don't know what to do other than replace the engine.

This leak chasing thing is almost as bad as chasing a glitch!

I'm not beeing defensive, you got me wrong, and I don't feel ofended either. Just trying to help based on my experience with Sirios.
All I was trying to point out is, that yes, early TRP Sirios had carb problems that are now corrected, and then crank problems that are now corrected.
I would suggest, if you can, get a hold of a Nova carb from a friend, and just drop it in and try it, it should fix your problem, because I don't think it's worth to buy a new Sirio carb for an allready superseeded engine.
As per packaging problems, that was and is an issue of Trinity, the US distributor, that I've heard has problems with all products they deal with, that's why they lost Novarossi, Team Magic and so on, and I wouldn't be surprised if they lost Sirio too.
If I can help you on any other question just drop it here, I'll be glad.

AFM

I have tried the M. Collari Version of the Sirio with good results. It has awesome high end power but it lacks a little bit of torque. I also noticed that the stock carburator does not hold the settings to well. Then again, the sleeve is ACC which is a little bit difficult to tune. I replaced the carb to Nova Mega with good results. Anyone has tried this engine?? please let me know your feedback.

Bottom line what do i need to do to this motor to get it to last?
What is the max running temp for long engine life and good performance, and are there any no no's for the motor besides running it hott?

gentlemen: I have tested my engine (Sirio/Collari, ACC) and I have found that it makes the best power at 260 degrees. I have tried running it at 200, 220 and 240 but it just does not perform up to racing standards. At 260 the engine has good response across the rpm range, it idles well, and a good line of smoke is visible while at full throttle.

After a full 20 minutes race the engine temps ranged from 265-270, dropping quickly to 262-260 after a 30 second idle.

It is the second time that I race Sirio engines, the first one did not worked well for me (early model) but I must say that the one I am running now is a leap forward to the previous one. The only mod that I have done to the Sirio/Collari was to replace the stock carb in favor to a Nova Mega carb with good results.

even the evo 2 has probs with the carbs?

and 260 deg isnt gonna cook my motor or rod if i run it at that temp consistantly?

where can i find parts for this motor and what type sleeve is used, aac or abc?

Hi Gent

Did you buy a used engine??? I thought you had a new one.
It depends what motor do you have to determine if it takes an AAC or ABC sleeve. There is both models.
Do you have an Evo2 model or the old TRP, there is a difference in models.
At any rate, both sleeve types fit in same crankcase of either model.
At Tower Hobbies they have ABC piston and sleeve kit for old TRP model and also the conrod, which fits either model, also gaskets circlips, and bearings.

AFM

i have a used trp and im geeting an evo2, i want to have the trp as a back up, the evo is not quite broken in yet.

Gentlemen: The statement you mentioned above is an old "urban leyend" my friend. That was true years ago when the tehcnology was not up to standars, even today's materials are far more stronger and better designed. Please check last month ( or this month edition, not sure) of Radio Control Car Action, they have an article on this topic which validates my point. I have raced a J.P Black S-12 Engine for about a year running at those temperatures and now, almost 13 months later it needs to be serviced. It's all on how do you mantain your motor. I always take apart my engine after a race, I clean it up inside and out with denaturated alchohol, polish the crank and the outside of the sleeve, check the bearings etc... after that I put the internals back in using enough after run oil mixed with a little of "Metal lube" .

That my friend, it what it takes to make an engine last longer. It's all on how do you treat it.