there was a hundreds of Novas engines and we will nevr find out how many blew up, but even if it was 20 out 100 it is only 20% failure, but 2 Sirios out of 6 is about 33 %. I think no need extra explanation.
To change head clearance from 0.0175 to 0.029 is realy huge difference ( about 0.025 cc head volume increase), I agree with that. But I am very certain that detonation came mainly not from compression ratio. If I will be asked what to do first, I will sugest to glue sleeve to crancase. I explain many times what happening with AAc sets and will do it again. Sleeve sitting in all Sirio engine pretty free and during the work sleeve has micro vibration and create a lot of microscopic debry. That debry goes to combustion chamber and light up during the combustion process and create a lot of temperature, which is creating abnormal detonation. I will be agree to slow down detonation if you change head volume on 0.012, but if it was reqired to rasise further, for me meaning-it wasn't compression ratio. It is my assuming and I will start from it. I also can sugest to use Ferrocene in this kind of case, it will remove detonation completely, but it will keep combustion speed at the same rate. Again if it is detonatin cause by compression ratio-it is easy solve by couple different ways, but if detonation create by other issues-it will not help.

TopGun, thanks, now we are talking more constructively. Regarding the % numbers I unserstand what you are saying. I was just talking about the guys in our team. There were more LCM engines there. The difference realy I think (and I think that you will agree with me) is that most normal drivers do not push their engines as far as what we (people running at A main national levels of racing) do. (guys, don't take me wrong, I'm not trying to sound like a snob). But what I'm saying is that when at this level people are pushing the raw limits of what any engine can do both in terms of HP and longevity. Most normal drivers will never push their engines this far in regards to compression, RPM and general strain, a 1 hour main at this level is simply torture for any brand of engine. I still stand by my beliefs that having 2 engine failures for 6 drivers under these conditions is good. Heck look at Sal, the only TOP driver to make the main. He blew his engine so this equals a 100% failure rate for them. Are their engines unreliable? I personaly don't think so, it was probably just pushed too far. As you are aware of it can be any numbers of variables, clutch engages too late causing engine to bog= excessive strain on engine= raising temp on engine, engine possibly a little too lean, pipe gets damaged causing engine to go lean, tires wear down too much=over rev engine, clutch starts slipping, tank leaks, engine is over compressed etc. etc. etc.

Regarding the aluminum particles that you mentioned it is possible. However the issues that we experienced were only with the drivers running this 1 particular type of fuel. The rest we could run at the lower deck heights and had no failures or engine related tuning issues. This leads me to think that it is fuel related. In hind sight having to make such a dramatic deck height change just to run this fuel without detonation should have been a warning sign. Something I guess we ignored.




daniz24 you said "Yes, the LCM indeed has a ton of HP. But how much is it? I believe it is almost twice (maybe over) than Sirio Evo2 price. So you can't say Sirio produce higher performance engine with less price compare to Novarossi. Sirio with Sirio-based LCM is totally different story..."





When you say Evo2 I think that you are talking about .12's which I do not know a lot about as I'm involved mostly with 1/8. I have however seen the new LCM .12 engines and there is a lot of neat stuff that they are doing. Regarding prices I think they said they are supposed to street around $300 and should be available in a month or so. Is this twice as much as the Evo2's?

I can talk about engines a lot and can give anybody a lot of advce and ideas how to solve this or that problem, but I realy don't like when destributor is blaming user and very often is for nothing.
About detonation, as I mentioned before, try to find ferrocene and try it, you will see real difference. Since it was used first time in airmodeling in some classes, results grew up tramendosly. But in many classes there ( FAI) they have standart fuel, with no additives, so it is use only on 1 class now. Most anti dtonation additives slow down detonation but also slow down speed of combustion process, but ferrocene is realy unique-it will not slow down combustion process whatsoever. It has some negative sides too-engine has to be clean more often, but if you go to limit of power, this is what people need.
about reliability of P/S sets- I realyy might make some prototyes for Sirio. At list for Novas it is working just great. It has no negative respond ( performance) if it is overleaned ( unless too lean), but it will loose power, and so far no one set ( there is more then you can immaging in use right now ) ever been blew up. Actualy I want to blew up one ( due to overheating) and so far never. We even run it with no smog was comming out from pipe for full tank-nothing, not even any damage for it.
The only one reason keep me off from it is -there are not too many Sirios is around and for whom I will make it?
Edward

Price depends on a lot of things. The way the company is set up is a huge influence on cost = shelf price. NovaRossi made some business decisions that are working against them at the moment. That is one reason prices went up.

TG......I owe you....a drink???.....well someday we'll meet there, or here in Peru......Hats off on your Guarantee Policy, it's one of a kind in the racing industry of any motorized sport.
And as I said before, If you decide to make better parts for Sirio engines, they will be more than welcomed.
Lets keep having fun meanwhile.

AFM

For your files, and to set this issue clear. I distribute Sirio engines here in Peru, and this are the suggested retail prices in Europe for 3 ports .12 Sirio engines (prices in Euros):
S12 TRP Evo 2 EFRA ABC Turbo 253.00
S12 TRP PRO Evo 2 EFRA AAC Turbo 263.72
S12 TRP Evo 2 IFMAR ABC Turbo 261.95
S12 TRP PRO Evo2 IFMAR AAC Turbo 272.54
And these are the suggested retail prices for LCM engines:
LC12 PRO 3E Standard AAC EFRA Turbo 259.90
LC12 PRO 3E MC Mauro Collari Modified 340.20

So as you can see, the Standard EFRA AAC LCM, is actually
1.45 % cheaper than the equivalent EVO2

Now, the Modified LCM, is 25% more than the equivalent IFMAR EVO2.

Of course actual sales prices may vary from LHS to LHS.

Now if you compare the price of the Modified LCM with a Modified JP FX03.......they are priced just about the same.

Hope this clears the issue

AFM

Yes. That's weird, in here the Evo2 cost about US220 and other guy asking for almost US400 for M.Collari Modified Sirio.

Quote:

Now if you compare the price of the Modified LCM with a Modified JP FX03.......they are priced just about the same.

Hope this clears the issue

Yes, Modified LCM are slightly higher than JP Modified. For the power, I heard LCM is quite good but never have chance to try it since I'm distributing JP engines in here. Thanks AFM

does anyone got anything to say about the (21brpro)buggy pro? this motor has caused me grief for awhile now....i burned a hole through the piston(leaned out after running "good"??)...... rebuilt it..going for round 2...who knows this engine makes me feel like im brand new at this game??? sombody want to tell me a trick....plug??? fuel??? temp??? anything??? when this thing runs good (once in awhile)i got to hand it to em its fricken fast!!!..

Is it AAC construction? If it is , just glue sleeve in crancase and all your problem will disappear. Please don't ask me how to take it later-I have no idea, but you burn the hole in piston due to the issues which any AAC conventional desing engines have (please read my posts above). If it is ABC, above principals will not help, it might be different reasons. Give more dscription of your problems and I am sure someone will give you clue.
Edward

In regards to the engine failures at the nationals, we did some research to find the true cause of the engine problems and asked those racers what they found when they disassembled their broken engines. It's my understanding that they all changed to a new rod as suggested by the engines importer just before the A-main. Later upon disassembling the broken engines it was discovered that one engine had a wrist pin clip come out that destroied the piston and sleeve, another engine had the lower end of the rod break just above the crank pin. We're still waiting for a response from the third driver but I will post the response when available. In no way can a loose wrist pin clip or a broken rod (above the crank pin) be blamed on fuel! In fact these racers were using the fuel for several months prior to the event with total reliability. It's a real bummer when these things happen and it's only natural to try to find the cause.

So, what do you think will cause to c-clip come out and conrod broken? I agree it is not fuel at all.

yes top gun it is aac....glue the sleeve in with what? if that would help i guess its worth a try...when my engine broke or (burned a hole) it was pretty lean i developed an air leak somwhere and i was just trying to get another lap in the qualifier......stupid me! biggest mistake i ever made!! what my motor would do (when it was new) is start up fine then stall soon as i apply some throttle...seemed like no matter where i put my settings it would just stall anyway...it would also start (from cold)run for a little while stall then when i try to restart it wouldnt fire?? even after the last run was coming off at 240 deg??? with from what i saw as a great tune...fast punchy everything i wanted...have you heard of anybody haveing the idle screw back out?? i think this happend to me last run ive yet to really look but it seemed as if the slide was completely closed??? its also got a killer pinch is that because of aac?? how long do i have to run this thing before it just plain starts easier!!

Guy's, I have been reviewing this thread for a little while and wanted to make a couple of comments. 1, TKT's comments were based on overheard conversations and were an attempt to relay information that was not entirely accurate. 2, Those comments are not the opinion of Werks Racing. 3, Our team experienced a total of two engine failures at the nationals. 4, The two issues were caused by a wrist pin failure (not clip related) and a rod failure. Any time an engine is stressed under racing conditions these failures can occur for a multitude of reasons. 5, It is NOT our opinion that these issues are in any way fuel related. If you have further questions regarding this please feel free to call me directly at (408)365-1000.

Ron Hopkins
Werks Racing

You can use LOCTITE 635, 638 or 640. Defenetly you will not be able to disassembly it onese it cures.
Edward

if i have to actually glue my sleeve in for it to run right....what good is this engine then... ive been pulling my hair out with this thing for awhile and after a new piston sleeve button wrist pin and a proper bench break in the thing still dont run right?? i was starting to re-evaluate my tuning skills?? since this thread has people offiliated with star motors in it.....what would you say ive spent much$$$$$ and i have yet to see any return but problems!! i want to ship this thing back!! ive had a rb c3 rody(three thumbs up!!) and a rossi black magic ( another three thumbs up!!) still have em and they still run like a top...this motor i bought beacause i wanted to put a new engine in my x5 because i bought the x5 new...last year it cost me 3 points races and this year this last past sunday it cost me one because it stalled for no reason!! i dont want it anymore...