SIRIO.18 , Fantom .15, or 2.5?

**toomuchHP** · 05-21-2003 06:13 PM

I need help, I cannot decide. I also need to know what i will need to do the conversion for all engines, such as exhaust manifold (sirio/fantom) carb linkage and clutch/flywheel. I know the 2.5 is the cheapest, The Sirio is the HP king, fantom I heard was good. but it has less hp than the 2.5. I have been leaning toward the sirio but i do not know what i need to install it on my rustler. I am not interested in any OS engines they are vastly under powered! I was possibly considering a megatech as a distant backup.

**dAN4011** · 05-21-2003 06:42 PM

the sirio will be so powerful that it wont even be any fun in a rustler, the 2.5 is a good engine but i have heard alot of people are having problems with them (including me) but if you can get the 2.5 running right its a great engine also you wont need to make any modification to get this engine to work, the fantom fr12 and fr15 are supposevely great engines but im sure tazz rc owner will tell you a little bit more about this engine considering he owns one
id say overall the fantom engines are the best considering the sirio is WAY to powerful and the 2.5 has caused me and many others too have problems with it stalling but you might wanna take another look at the os engines ive heard alot of great stuff about these engines

**toomuchHP** · 05-21-2003 06:59 PM

i have owned os in other vehicles. I think they are junk! slow and weak.

**dAN4011** · 05-21-2003 07:04 PM

well lets see if tazz will tell us something about the fantoms he will probably respond, ive heard alot of great stuff about the sirio from t maxx owners but i think it will be a lil to powerful for the rustler just think about it, the 2.5 engine has 1.3 hp and i can barely keep it on the ground (when the engine is runnung right)and with the sirio engine that has near 2 hp it will just be crazy but you can try it

**srk399** · 05-21-2003 07:08 PM

What OS engines did you run? If the CVRs arent fast enough for you, then go with the Sirio, dont even consider the 2.5. I love my CVR .12 powered NRustler, very reliable, tuning is spot on. The CVs are a little slow, but the CVRs are in a total different ball game. Take a look at the CVRs, I think youll like them.

**villain_tfc** · 05-21-2003 09:05 PM

if you like sirio get the .15 one it has 1.7 hp heres a link to it
http://www2.towerhobbies.com/cgi-bin...?&I=LXDRC0&P=7

heres the specs http://www.teamtrinity.com/nitro/eng...irio/sirio.asp

**Tazz R/C owner** · 05-21-2003 11:17 PM

The 2.5 has a good powerband, good low end torque, and nice speed.
The Sirio .15 (the .18 is too much for a NR) has the most power, good speed (lower than the Fantom and 2.5 though), and nice torque (not as good as the 2.5).
The Fantom FR15 '03 has the most speed, fairy good torque, and plenty of power.

Just like the rest of Trinity's stuff, the sitio parts are overpriced. A piston and sleeve set cost over $80 ($120 retail price), the carb costs over $75. If your break something on the engine or ware it out, you might as well spend a little mroe and replace the whole engine.

Of those engines, I would only consider the 2.5 and the FR15 '03.

**Mantronic** · 05-25-2003 12:46 PM

I'm thinking of a FR15 '03 to replace my pro .15
It my best choice because IT,s will be the less expensive, run fast and have more torque than my .15

**Scrub** · 05-25-2003 03:06 PM

Well I think your'e making a good decision with a Fantom. I have an older FR 15 and it's a great little engine. Alot of people don't like them and I bad mouthed them also when I first got mine but felt like an idiot after talking with Jeff Schroeder over at Fantom. He's a super nice guy and will help you in any way he can... and if you still have problems you can box up your engine and send it to him and he'll either fix it or replace it. I haven't run the Sirio or the 2.5 engines but Tazz is right. 120 dollars for a piston and sleeve is just plain outrageous and I don't think my tuning abilities are quite good enough for a 2.5 from what I've heard about them. My Fantom does me just fine. My little rustler screams. I recently bought a parts truck with some RD stuff on it that had a stinger pipe and header. I've heard not so great things about them but I tried it just for kicks and my little engine seems to like it. It's geared 20/72 at the moment and is flying and will break the back tires loose on demand. Jeff over at Fantom suggested 18/70 or 16/70. I'm gonna play around with the gearing this weekend and see what works best. Good luck with whichever engine you choose.

**dirtydog** · 05-25-2003 06:15 PM

Originally posted by toomuchHP
I need help, I cannot decide. I also need to know what i will need to do the conversion for all engines, such as exhaust manifold (sirio/fantom) carb linkage and clutch/flywheel. I know the 2.5 is the cheapest, The Sirio is the HP king, fantom I heard was good. but it has less hp than the 2.5. I have been leaning toward the sirio but i do not know what i need to install it on my rustler. I am not interested in any OS engines they are vastly under powered! I was possibly considering a megatech as a distant backup.

You are the first person I heard say that the OS engines are under powered.

**Po' Rustla** · 05-25-2003 07:56 PM

Hehe DirtDawg. If you want that much more power than O.S. provides, you might as well put liquid ROCKET FUEL In your engines

. There isnt anythnig better than better than O.S. without sacrificing waranty and more importantly RELIABILITY...

**dirtydog** · 05-25-2003 10:16 PM

Po ?.Too much hp is the one that thinks os engines are unde powered ,not me. I dont own one right now.

**Po' Rustla** · 05-25-2003 10:54 PM

Originally posted by dirtydog
Po ?.Too much hp is the one that thinks os engines are unde powered ,not me. I dont own one right now.

I know, I was just agreeing with you. I was taking about him though. Sorry for the confusion.

**dirtydog** · 06-05-2003 09:07 PM

Originally posted by villain_tfc
if you like sirio get the .15 one it has 1.7 hp heres a link to it
http://www2.towerhobbies.com/cgi-bin...?&I=LXDRC0&P=7

heres the specs http://www.teamtrinity.com/nitro/eng...irio/sirio.asp

This engine produces its H.P at 39,000 .It maybe a screamer but does it have any low end power?.

**dirtydog** · 06-06-2003 05:31 PM

Originally posted by Tazz R/C owner
The 2.5 has a good powerband, good low end torque, and nice speed.
The Sirio .15 (the .18 is too much for a NR) has the most power, good speed (lower than the Fantom and 2.5 though), and nice torque (not as good as the 2.5).
The Fantom FR15 '03 has the most speed, fairy good torque, and plenty of power.

Just like the rest of Trinity's stuff, the sitio parts are overpriced. A piston and sleeve set cost over $80 ($120 retail price), the carb costs over $75. If your break something on the engine or ware it out, you might as well spend a little mroe and replace the whole engine.

Of those engines, I would only consider the 2.5 and the FR15 '03.

Is the Phantom sps12 a good motor ?.I know a guy who can get one for 80.00 new.

**Rage Against the RC10** · 06-06-2003 09:34 PM

Of the three engine you mentioned two of them have questionable realibilty issues with them. The 2.5 is great just dont run the dog snot out of it. I know people that had them and after some run time they start to fall off dramaticly. The Fantom has questionable quality control issues. I know people that love them and think they are great but know just as many that want to throw them in the garbage. The Sirio I have not heard much on this one yet. Hope it lives up to all the hype but I still remember alot of products that had alot of hype and never lived up to expectations. the jury is still out on that one.

On that note. If you want to get a real serious engine get something made by Nova Rossi(or a clone like the MUGEN) or RB concepts. Plus avoid all asian engines like the plauge. The materials the asians use just dont hold up at all like the Italians. Yes the Italian engines are more expensive and parts arent as cheap but these engines are like the best there is. You can really run them extremely hard all the time and not hurt them. Yes some of the engines you listed might have better numbers listed but that doesnt tell the whole story. The Nova and RB have a very wide power band they make tremendous power from idle to WOT. So what an engine can 1.7 hp at 45000 rpm if it takes off like a slug because it has no bottom end. What it does on a dyno means nothing compared to what it will do in a truck.

Yes I think Sirio is an Italian engine just havent heard anything about them at this time. I wouldnt spend that much money on hype. Look at the 2.5 you had to pay like 180 for one a few months back but now I just saw one the other day at the LHS with the pull start for 119. That also leads me to belive it isnt all it was claimed to be if the prices dropped that fast on them. They lowered the price because the demand went down after the hype cooled off. It wasnt worth 180 to start with.

**srk399** · 06-07-2003 12:06 AM

OK, Ive had the 2.5, and currently run the TX-18. IMO, the 2.5 already overpowers a machine that cannot turn worth a hoot. The Sirio is so much more than the 2.5. The Fantom is your best bet Id say. If you want to show off, and will be mostly drag racing, get the Sirio. Im sure your tranny or axels will last long. My TRX Pro .15 twisted axels after a while. I stripped stub axels, and blew the tranny. The Sirio has so much more power than the Pro its not even a competition. I put my Sirio TX-18 into my Rustler. My LSN was at 4 turns out.... theyre supposed to be at 2.5 turns from closed. Well, this thing was wheelying downhill on asfault. This is not a long term set up, your rig will be toast if you run it a lot with this much power. If you dont like the CVR power, go with a high end Italian job, Orion makes a great engine, theyre been winning races with their WASP series engines. RBs haul, Novas, ect. IMO, the CVRs and MT-12s offer the most usable power the Rustler can handle. A 2.5 would be practicle in an RC10 or XXXNT, simply because they can turn. A TX-18 simply isnt meant to be put in a 1/10 scale truck. My Maxx will probably beat my NRustler, which has a CVR .12 in it. My Rustler would not turn barely at all when I had it in there, its heavy, so the rear gets traction, and the front is too light. If I were you, Id go with a Mugen MT-12, if not that, a CVR .12 or .15. Good luck.

**dirtydog** · 06-10-2003 05:37 PM

I have a line on a almost new cvrx12 for 100.00 and I was wondering if it would be much of an upgrade to my MEGATECH 16 that I ported .What do you guys think?.

**nitroracer3** · 06-10-2003 06:30 PM

Well dirtydog,I will be the second person to say that OS engines are under powered.The new Fantoms could probly smoke a OS.

**dirtydog** · 06-10-2003 07:35 PM

Are the new phantoms that strong !!!?.I will have to chk them out at nitro review.com .I wonder how the one way bearing is in the os engines.

**POKeY** · 06-10-2003 07:48 PM

Dirtydog-

Why pay $100 for a used engine (even slightly used) when you can get a new one for $130. See this link:
OS .12 CV-RX

If you have a starter box you can get the bump-start version of this engine for $100 from Tower.

Tower also has the .12 TR for $100 if you have a starter box. The TR is OS's new "flagship" engine, and it is a STEAL at that price.
OS .12 TR

You can never be EXACTLY sure what you are getting when you buy a used engine.

Good luck-

jeremy

**dirtydog** · 06-10-2003 07:49 PM

OK!.I just checked out the fr15 at nitro review .com and most of the guys like the engine.The torque isnt impresive .Some guys say the trx can beat it off the line ,but they say the TOP END is unreal.They say from midrange and above is when this engine really takes off.They say the sleeve is very hard and the piston seems to waer prematurely in some of them.It may beat the oscvr on topend ,but I dont think it will beat an oscvr off the line.

**Flash-R.C** · 06-10-2003 07:55 PM

Is this the Slide or Rotary Carb?

Steve

**dirtydog** · 06-10-2003 08:27 PM

I checked out thier website and they make a slide and rotory version.It puts out 1.25H.P. and tops out at 42,300 rpm.The 2003 is said to be even better but I am not sure it is out yet.

**villain_tfc** · 06-10-2003 08:36 PM

in the rc car action mag it says that the .15 03 engines have 1.35hp!

**dirtydog** · 06-10-2003 08:54 PM

WELL! .I guess they bumped up the 03s H.P. Any of you guys evr heard of an O.S.cz12 ?.

**jayman** · 06-11-2003 01:49 PM

Ok so now what I am hearing is the 2.5 motor is no good?... ?

**dirtydog** · 06-11-2003 03:10 PM

Alot of guys have had good success with the 2.5 ,and a few havent .If you follow the instructions you should be ok and traxxas backs up everything they sell.

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