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Which engine for RC snowmobile? - 4/23/2012 6:56 PM   
Love2FlyMN


 

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From: Cottage Grove, MN, USA
Status: offline 		I'm going to be building an RC snowmobile and I don't know which engine to put in it. I would rather not have to design and build a custom starter box for it and I definitely don't want it to be pull start so I want electric start like the Traxxas Revo has.
I don't see that you can buy the engine with the electric start at tower or horizon but I see that you can buy the starter separately. Which engine would I have to get to put the electric start on it? also what are the differences in the IPS shaft and multi shaft?
Thanks guys.

PS. I am open to suggestions for other engines.

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RE: Which engine for RC snowmobile? - 4/23/2012 11:00 PM   
1QwkSport2.5r



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quote:

ORIGINAL: Love2FlyMN

I'm going to be building an RC snowmobile and I don't know which engine to put in it. I would rather not have to design and build a custom starter box for it and I definitely don't want it to be pull start so I want electric start like the Traxxas Revo has.
I don't see that you can buy the engine with the electric start at tower or horizon but I see that you can buy the starter separately. Which engine would I have to get to put the electric start on it? also what are the differences in the IPS shaft and multi shaft?
Thanks guys.

PS. I am open to suggestions for other engines.

How big do you plan to build the model? There are RTR snowmobile kits out there, but I think most of them are electric. A glow powered model would be super cool. For a Traxxas engine, the IPS shaft engine #5404 is a non-pullstart/EZ-start capable. It has a closed backplate and would require a bumpstarter to start the engine. The Multishaft engine #5407 comes with two threaded inserts for multiple applications. One crankshaft insert is short and one is longer. This engine accepts a pullstart or EZ-start. The single shaft engine with pullstart is #5409 and is EZ-start capable. The EZ-start system is sold seperately from the engines, which is normal. I dont know of anyone that sells an engine with an electric starter without buying a whole car.

Depending on the size of the model you plan on building will determine what engine you should/could use. I know Kyosho makes a Snow-cat looking RC track vehicle called the Nitro Blizzard. I believe this is 1/10th scale and comes with a .10 glow/nitro engine. I'm not sure how fast it is, but I would think anything from a .10 up to a .20 would be fine. I know the Traxxas EZ Start fits other engines, but I dont know off-hand which ones. Obviously the EZstart fits the Traxxas 2.5 and 3.3 engines, and I've heard it will fit an OS .21TM. I'm sure any pullstart smallblock would be able to be made to work.



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RE: Which engine for RC snowmobile? - 4/23/2012 11:06 PM   
Love2FlyMN


 

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Status: offline 		I'm planning on building it around the 3.3 Traxxas motor. A very reliable motor from what I've seen.

www.artattacksnowmobiles.net has a kit I could buy but I want to design my own and built it all custom. I will most likely be buying a track from the art attack website since I can't figure out what else I'd use. I think he puts a .21 in his kits that he sells so I should be alright with the 3.3 as long as I gear it correctly.
The company I work for has a 3D printer so I will be printing out many of the parts I will use and any of the machining I can do in the shop here as well (chassis, etc). The suspension will be bought from shocks and stuff I will buy at the LHS.

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RE: Which engine for RC snowmobile? - 4/23/2012 11:11 PM   
1QwkSport2.5r



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quote:

ORIGINAL: Love2FlyMN

I'm planning on building it around the 3.3 Traxxas motor. A very reliable motor from what I've seen.

www.artattacksnowmobiles.net has a kit I could buy but I want to design my own and built it all custom. I will most likely be buying a track from the art attack website since I can't figure out what else I'd use. I think he puts a .21 in his kits that he sells so I should be alright with the 3.3 as long as I gear it correctly.
The company I work for has a 3D printer so I will be printing out many of the parts I will use and any of the machining I can do in the shop here as well (chassis, etc). The suspension will be bought from shocks and stuff I will buy at the LHS.

The 3.3 is pretty stout for a stock RTR type engine. There are other engines in the same displacement class that are more powerful, but the 3.3 is no slouch. I have 2 of them currently and have had a few others in the past. I stay away from OS engines for a number of reasons, so I dont personally recommend them. I haven't tried one yet, but Dynamite has the .19T engine which is a direct replacement for the TRX 3.3. I think its a little cheaper, and having ran several Dynamite/Mach engines, they tune nicely and make good power.

This sounds like a pretty cool project. When you get more stuff put together for it like the overall look and design of it, start a build thread. I'll subscribe to it for sure.

By the way, its good to see another Minnesotan around here. Not too many of us that I've seen lately.

Kudos on the project.


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RE: Which engine for RC snowmobile? - 4/24/2012 7:10 AM   
Precision and Accuracy


 

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quote:

ORIGINAL: Love2FlyMN

I'm planning on building it around the 3.3 Traxxas motor. A very reliable motor from what I've seen.

www.artattacksnowmobiles.net has a kit I could buy but I want to design my own and built it all custom. I will most likely be buying a track from the art attack website since I can't figure out what else I'd use. I think he puts a .21 in his kits that he sells so I should be alright with the 3.3 as long as I gear it correctly.
The company I work for has a 3D printer so I will be printing out many of the parts I will use and any of the machining I can do in the shop here as well (chassis, etc). The suspension will be bought from shocks and stuff I will buy at the LHS.


Based on all the TRX 3.3's I have owned (3) and seen, I would not use one. Very "cheap" engine in terms of quality and construction. Very high connecting rod failure rate.

Go w/ the Dynamite or OS drop in if you are set on ez start, either will be worlds better than the Traxxas mill.

Personally I would put smoething bigger like a .21 or .25 in there w/ a rotostart if you don't want pull start.

Sounds like a cool project, put some pics up when you have them.



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RE: Which engine for RC snowmobile? - 4/24/2012 12:16 PM   
1QwkSport2.5r



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Status: offline 		I believe the broken conrods in 3.3's are due to improper break in. I never had one fail and none of the other guys I know have had a conrod failure either.

Too rich (engine way too cold) of a break in will cause problems. "factory settings" are too rich to break in any engine 95% of the time IMHO.



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RE: Which engine for RC snowmobile? - 4/24/2012 8:22 PM   
nitroexpress



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Status: offline 		Cold break in is a no no for any engine.  It will stress the rod for sure and cause excessive wear.  But the Traxxas 3.3 is known for having a weak conrod.  That's why there are HD rods available.

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXVHW4

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RE: Which engine for RC snowmobile? - 5/1/2012 10:15 AM   
8MILLSNIPER007


 

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Status: offline 		I have been modding 3.3 for years, including lighting the con rod and have yet to have a failure.  I do recommend running Traxxas fuel in the 2.5 and 3.3 as it has a higher oil content.  As far as the snowmobile goes, I half to agree a big block 21-28 with a rotostart would be a better option.  I would love to see a build thread on this project!!

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RE: Which engine for RC snowmobile? - 5/2/2012 2:07 PM   
Love2FlyMN


 

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Status: offline 		Oh yeah! I totally forgot about the rotostarts. So I don't know much about what a good engine is. I have a Mach 427 (teal head) in my Mugen that I just blew but I didn't like that engine. Very finicky. I have two friends with Revo's and their 3.3's are very forgiving and still have enough power.
What other engines would you folks recommend? I don't want to spend more than about $175. Anywhere from .21+ for size.

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RE: Which engine for RC snowmobile? - 5/2/2012 9:05 PM   
8MILLSNIPER007


 

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Status: offline 		Well, you could go with a STS 28 or 30 for right around $100. They are very powerful engines, I use them in all my vehicles and have never had an issue, but you have to break them in correctly and preheat the head before you try and start them or you will risk damaging the con rod.  You only need to do this until the engine is broken in as they have a very tight pinch from the factory.  Also the XTM 24.7 is a great motor as well as the SH .28.  IF you do purchase a new engine, regardless of what brand you should always open it up and makes sure there is no left over metal shavings, you would be surprised at what you will find!  If you use the heat cycle method of breaking in your new mill it should give you many gallons of fuel before its time for a rebuild. If it was me I would go with the STS .28 or 30- the .30 is a monster though alot of power!  NITROCOUNTRY.COM sells STS engines and parts for them.

The SH and XTM line of engines are usally very easy to tune and they hold a tune very well, your 427 might of had a air leak and that could of been the reason it was hard to tune.

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RE: Which engine for RC snowmobile? - 5/3/2012 2:14 PM   
Love2FlyMN


 

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Status: offline 		Awesome, thanks 8MIL. I see they have a rotostart backplate for $15 for those at that website too.

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RE: Which engine for RC snowmobile? - 5/3/2012 8:33 PM   
8MILLSNIPER007


 

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Status: offline 		If you buy an STS from them I think you get your choice of either a bumpstart, pullstart or rotostart backplate so it shouldnt cost the $15 extra.

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