Go Back   RCCrawler.com Bulletin Board > RCCrawler General Tech > General Crawlers
Loading

Notices


Thread: Nitro Crawler

Reply
 
LinkBack Thread Tools Display Modes
Old 10-20-2008, 04:15 AM   #1
Rock Crawler
 
littleskull99's Avatar
 
Join Date: Jan 2007
Location: Secret Crawl Location Deep In England
Posts: 554
Default 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.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Sorry for the blurry pics.

Feel free to comment.

Matt

Last edited by littleskull99; 07-22-2009 at 04:03 AM. Reason: title change
littleskull99 is offline   Reply With Quote
Sponsored Links
Old 10-20-2008, 06:00 AM   #2
On the lookout for Rocks
 
constantmotion's Avatar
 
Join Date: Mar 2006
Location: Monroe, Louisiana
Posts: 3,742
Default

Congrats on getting everything crammed in there....looks like it'll work for ya.
constantmotion is offline   Reply With Quote
Old 10-20-2008, 06:41 AM   #3
Rock Crawler
 
littleskull99's Avatar
 
Join Date: Jan 2007
Location: Secret Crawl Location Deep In England
Posts: 554
Default

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
littleskull99 is offline   Reply With Quote
Old 10-20-2008, 06:58 AM   #4
I am the Nightrider!!!
 
Big Mike's Avatar
 
Join Date: Oct 2006
Location: Sterling VA VARCOR
Posts: 2,764
Default

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.
Big Mike is offline   Reply With Quote
Old 10-20-2008, 07:16 AM   #5
RCC Addict
 
Join Date: Jan 2008
Location: Lake Michigan
Posts: 1,917
Default

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.
sweli is offline   Reply With Quote
Old 10-20-2008, 07:49 AM   #6
Rock Crawler
 
littleskull99's Avatar
 
Join Date: Jan 2007
Location: Secret Crawl Location Deep In England
Posts: 554
Default

Quote:
Originally Posted by Big Mike View Post
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...
Mike, Thanks for the post. I thought I would already have a new a**hole by now but everyones been nice.

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
littleskull99 is offline   Reply With Quote
Old 10-20-2008, 07:53 AM   #7
Rock Crawler
 
littleskull99's Avatar
 
Join Date: Jan 2007
Location: Secret Crawl Location Deep In England
Posts: 554
Default

Quote:
Originally Posted by sweli View Post
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?
The electric fan seems to be up to the job, I dont have a temp gun so I dont know exactly what temp it runs at but I do check it about every 3 mins or so. Any other type of cooling would take up too much room so if I need more, I will add another fan. The air doesnt have a chance to miss the head as its so close.

Matt
littleskull99 is offline   Reply With Quote
Old 10-20-2008, 07:57 AM   #8
RCC Addict
 
Join Date: Sep 2005
Location: Behind the torch!
Posts: 1,373
Default

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.
Crawln Coles is offline   Reply With Quote
Old 10-20-2008, 08:44 AM   #9
Rock Stacker
 
Join Date: Sep 2007
Location: york, SC
Posts: 76
Default

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
daleo8803 is offline   Reply With Quote
Old 10-20-2008, 08:47 AM   #10
RCC Addict
 
Join Date: Sep 2007
Location: Westland, MI
Posts: 1,524
Default

I cant wait to see a vid this looks like it might do the trick. Of course it will make the sport much louder.
hitman46mod is offline   Reply With Quote
Old 10-20-2008, 09:08 AM   #11
Rock Crawler
 
littleskull99's Avatar
 
Join Date: Jan 2007
Location: Secret Crawl Location Deep In England
Posts: 554
Default

Oh yeah its loud! Pi**ed off most of my crawling buddys on the test run.

Matt
littleskull99 is offline   Reply With Quote
Old 10-20-2008, 09:10 AM   #12
Body movin'
 
Szczerba's Avatar
 
Join Date: Oct 2007
Location: Arkansas
Posts: 5,341
Default Gas Crawler

Quote:
Originally Posted by daleo8803 View Post
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

x2!
Szczerba is online now   Reply With Quote
Old 10-20-2008, 12:01 PM   #13
Serving with a Smile
 
frdtrkguy's Avatar
 
Join Date: Feb 2007
Location: BFE, NV
Posts: 2,068
Default

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
frdtrkguy is offline   Reply With Quote
Old 10-20-2008, 02:00 PM   #14
RCC Addict
 
Join Date: Oct 2005
Location: $t. Helen$, OR
Posts: 1,082
Default

video of it "CRAWLING" ?


not bashing

looks good though.
Jeepernick is offline   Reply With Quote
Old 10-20-2008, 02:10 PM   #15
RCC Addict
 
Join Date: Aug 2008
Location: cape crud... will you be my friend
Posts: 1,922
Default

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.
crunky is offline   Reply With Quote
Old 10-20-2008, 03:24 PM   #16
Quarry Creeper
 
Join Date: Jul 2008
Location: Saskatoon in summer, Las Vegas in winter.
Posts: 234
Default

Video please...
Prostreet is offline   Reply With Quote
Old 10-20-2008, 04:06 PM   #17
Quarry Creeper
 
Join Date: Jan 2007
Location: Ontario, Canada
Posts: 343
Default

Kudos.
HndsWthtShdws is offline   Reply With Quote
Old 10-20-2008, 04:12 PM   #18
I wanna be Dave
 
Join Date: Oct 2005
Location: Columbia TN
Posts: 6,173
Default

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!!!!
Kamikaze is offline   Reply With Quote
Old 10-20-2008, 04:13 PM   #19
Fullsize Addict
 
canadianbacon's Avatar
 
Join Date: Dec 2007
Location: Moncton, NB, Canada
Posts: 1,781
Default

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?
canadianbacon is offline   Reply With Quote
Old 10-20-2008, 05:02 PM   #20
RCC Addict
 
Join Date: Oct 2005
Location: $t. Helen$, OR
Posts: 1,082
Default

Quote:
Originally Posted by canadianbacon12 View Post
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?
Digital throttle servo

at least that is what helped on my Nitro Rustler

but it will never be as "smooth" as a electric... IMO
Jeepernick is offline   Reply With Quote
Reply


LinkBacks (?)
LinkBack to this Thread: http://www.rccrawler.com/forum/general-crawlers/140650-nitro-crawler.html
Posted By For Type Date
A nitro crawler, it can be done - VARCOR - Virginia Radio Control Off Roaders This thread Refback 10-05-2011 08:37 AM

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 02:12 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.
Copyright 2004-20010 RCCrawler.com