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10-20-2008, 04:15 AM
| #1 |
| Rock Crawler  Join Date: Jan 2007 Location: Secret Crawl Location Deep In England
Posts: 546
|  Nitro Crawler (Update page 5)
Hey, I wanted to have a stab at a Nitro Crawler. I have tested it and it works. Will have video up soon. Specs: Axial Axles Axial X Trail Chassis Moabs for the time being Toki 1cc NB16 Engine NB16 Gearbox (4-1ish) R2 Gearbox Couple pics.        Sorry for the blurry pics. Feel free to comment. Matt Last edited by littleskull99; 07-22-2009 at 04:03 AM. Reason: title change |
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10-20-2008, 06:00 AM
| #2 |
| On the lookout for Rocks   Join Date: Mar 2006 Location: Monroe, Louisiana
Posts: 3,711
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Congrats on getting everything crammed in there....looks like it'll work for ya.
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10-20-2008, 06:41 AM
| #3 |
| Rock Crawler Join Date: Jan 2007 Location: Secret Crawl Location Deep In England
Posts: 546
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Cheers. It just about fits in. One of the main requirements was that it fit under a 10th shell. Should have a video up very soon. Matt |
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10-20-2008, 06:58 AM
| #4 |
| I wanna be Dave  Join Date: Oct 2006 Location: Martinsburg WV
Posts: 2,781
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I can't resist looking every time I see a "I'm building a nitro crawler" thread. At least this thread is different from the norm - there are actual (albeit a bit blurry) pictures of a rig resembling a crawler that actually has a nitro motor mounted up, and the output actually has a clutch installed, that is really mated to some kind of transmission/transfer case. This is the first time I can remember someone has actually "made good on their threat" and really built something. Props for that Matt, and good luck to you. I'm Interested in a few things personally, please post back if you can: 1- Clutch type, how you set it up, and how long it takes you to burn it up? 2- Is the brake tied to the throttle servo like a normal set up, or do you have seperate control of the brake to hold you on hills? 3- Motor temperatures during a run, and how long it takes you to burn up a piston or head? (I notice there is a fan mounted behind the head, so it looks like you've at least thought about keeping temps in check) 4- How you pressurize the fuel system to keep it running during severe climbing, descending, or sidehilling? (Or does a stock set up suffice?) I'm not trying to knock you here, there are just some inherent problems to overcome when attempting a nitro powered crawler using conventional technology and I'm curious how this project is going to perform for you. I'd love to see video of it running... Last edited by Big Mike; 10-20-2008 at 07:01 AM. |
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10-20-2008, 07:16 AM
| #5 |
| RCC Addict Join Date: Jan 2008 Location: Lake Michigan
Posts: 1,898
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Nice job. Is the fan you have enough to keep temps down? Can you channel the air in and around the heads with some plastic shrouding and cut the body you plan on using? Are you considering a marine head for the nitro motor to aid in cooling it with a small electric pump and radiator setup? Somewhere I saw a post on RCgroups.com where someone had done that to a Tmaxx. Can you run it rich enough to lower head temp? Last edited by sweli; 10-20-2008 at 07:18 AM. |
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10-20-2008, 07:49 AM
| #6 | |
| Rock Crawler Join Date: Jan 2007 Location: Secret Crawl Location Deep In England
Posts: 546
| Quote:
The clutch that comes on the NB16 is not up to the job, we messed around with that for a while and then found out that a traxxas two shoe clutch fits. Got the traxxas clutch shoes installed with a tighter spring. The disc brake is tied to the throttle but it is on the first gearbox so it spins at the same rate it would on the 16th car. I will probably look into a clamp/parking brake in the future. The brake ends up being very proportional and precise. There is so much gearing in the truck that it pretty much holds itself on hills but does roll back when at idle. The engine is cooled by a fan running off the 6V pack, I thought I would need like 5 fans but one directly seems to do the job. I havent burned myself touching the motor yet  The amount of air that is produced by the small fan is amazing and probably not far off the normal air cooling of the car moving through the air.The pressurising (sp) of the tank is done in the usual way and as long as you keep half a tank or more of fuel, The pickup is always working. I need to have an extra coil of fuel line in somewhere so that it will run upside down long enough for me to run over and turn it back over. I realise thats its never gonna be a comp crawler but I sure am gonna have fun with it. Matt | |
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10-20-2008, 07:53 AM
| #7 | |
| Rock Crawler Join Date: Jan 2007 Location: Secret Crawl Location Deep In England
Posts: 546
| Quote:
Matt | |
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10-20-2008, 07:57 AM
| #8 |
| RCC Addict Join Date: Sep 2005 Location: Behind the torch!
Posts: 1,360
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Finally somebody built one, pretty cool! I like different stuff. Thought about building a nitro scaler just for kicks, but it was only a thought.
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10-20-2008, 08:44 AM
| #9 |
| Rock Stacker Join Date: Sep 2007 Location: york, SC
Posts: 73
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thats pretty kool man. ive seen people build gas crawlers before but your looks every good. everything seems to have a real propose. looks good i need to see a video asap!! lol daleo |
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10-20-2008, 08:47 AM
| #10 |
| RCC Addict Join Date: Sep 2007 Location: Westland, MI
Posts: 1,508
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I cant wait to see a vid this looks like it might do the trick. Of course it will make the sport much louder.  |
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10-20-2008, 09:08 AM
| #11 |
| Rock Crawler Join Date: Jan 2007 Location: Secret Crawl Location Deep In England
Posts: 546
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Oh yeah its loud! Pi**ed off most of my crawling buddys on the test run. Matt |
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10-20-2008, 09:10 AM
| #12 | |
| I wanna be Dave Join Date: Oct 2007 Location: Castle Rock, WA
Posts: 8,785
| Gas Crawler Quote:
x2! | |
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10-20-2008, 12:01 PM
| #13 |
| I wanna be Dave Join Date: Feb 2007 Location: BFE, NV
Posts: 2,324
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I like the emphasis you placed on trying to keep the CG low and a forward weight bias. This is the best looking nitro crawler to date  |
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10-20-2008, 02:00 PM
| #14 |
| RCC Addict Join Date: Oct 2005 Location: $t. Helen$, OR
Posts: 1,082
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video of it "CRAWLING" ? not bashing looks good though. |
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10-20-2008, 02:10 PM
| #15 |
| I wanna be Dave Join Date: Aug 2008 Location: cape crud... will you be my friend
Posts: 2,102
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i'm sitting here tipping my head like a german shepard looking at someone after hours... gear reductions... cooling fans... damn m8 you just got this thing wrapped up tight, tucked better than a betty in singapore. get us some vids bro ! i always wondered why nobody has gone liquid cooled heads like the boats do. |
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10-20-2008, 03:24 PM
| #16 |
| Quarry Creeper Join Date: Jul 2008 Location: Saskatoon in summer, Las Vegas in winter.
Posts: 230
| Video please...
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10-20-2008, 04:06 PM
| #17 |
| Quarry Creeper Join Date: Jan 2007 Location: Ontario, Canada
Posts: 341
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Kudos.
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10-20-2008, 04:12 PM
| #18 |
| I wanna be Dave Join Date: Oct 2005 Location: Columbia TN
Posts: 6,154
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See how much better these threads turn out when someone actually has something to show without just being an ass hat about what they are "going" to built. Waiting on the video!!!! |
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10-20-2008, 04:13 PM
| #19 |
| RCC Addict Join Date: Dec 2007 Location: Moncton, NB, Canada
Posts: 1,962
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Looks like it should work good. Not really familiar with nitro's but can you make them have nice smooth throttle control like an electric?
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10-20-2008, 05:02 PM
| #20 | |
| RCC Addict Join Date: Oct 2005 Location: $t. Helen$, OR
Posts: 1,082
| Quote:
at least that is what helped on my Nitro Rustler but it will never be as "smooth" as a electric... IMO | |
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