R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road

Reply
 
Thread Tools Search this Thread
Old 03-18-2008, 03:14 PM   #1
Tech Regular
 
Join Date: May 2007
Posts: 290
Trader Rating: 14 (100%+)
Default OS .18 in an RC8 - questions

So I want to run a .18 in my RC8.

I know that several of the buggy nationals racers ran the .18 in qualifying, but have been unable to locate any information on what engine etc.

First: The engine mount, I was told it would require a special engine mount to run an .18. Who manufactures one for the RC8?

Second: Pipe and Header would likely need to be different due to the reduced flow that a .18 engine pushes through, what is a good match for an OS .18?

any information is appreciated, all of the threads on RCTech on this are dead ends.
Seyruuen is offline   Reply With Quote
Old 03-18-2008, 05:25 PM   #2
Tech Elite
 
looper's Avatar
 
Join Date: Feb 2006
Location: DFW area of Texas
Posts: 2,224
Trader Rating: 19 (100%+)
Send a message via Yahoo to looper
Default

the engine is a 18tz the pipe? hmm 053 or jp3
looper is offline   Reply With Quote
Old 03-18-2008, 07:50 PM   #3
Tech Elite
 
portyansky's Avatar
 
Join Date: Mar 2007
Posts: 2,979
Trader Rating: 54 (100%+)
Default

May I ask why you would put a .18 engine in a rc8?
__________________
Team Tekno Canadian Team Manager
Team Hitec
portyansky is offline   Reply With Quote
Old 03-18-2008, 07:59 PM   #4
Tech Elite
 
Scottmisfits's Avatar
 
Join Date: Jun 2004
Posts: 3,104
Trader Rating: 7 (100%+)
Default

Alot of the .21's out today are very overpowered. For the average club racer, an .18 could be faster around trhe track than the big blocks.
Scottmisfits is offline   Reply With Quote
Old 03-18-2008, 08:47 PM   #5
Tech Champion
 
thecman26's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jul 2006
Location: South Central Kansas
Posts: 7,685
Trader Rating: 98 (100%+)
Default

Yeah I heard about a guy running an .18 in his buggy at the rc pro races... Plenty of power but incredible fuel economy compared to a .21... Dont know how he did though...
__________________
Chris Keen: Viola, Kansas
Kyosho RZ6, TLR 22 3.0, TLR 4.0 SR (soon),& 22T 3.0
"I'm too drunk to taste this chicken!", Col. Sanders
thecman26 is offline   Reply With Quote
Old 03-18-2008, 08:47 PM   #6
Tech Champion
 
thecman26's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jul 2006
Location: South Central Kansas
Posts: 7,685
Trader Rating: 98 (100%+)
Default

I personally have an OS .18TZ in my crt .5, wanna talk about overkill????
__________________
Chris Keen: Viola, Kansas
Kyosho RZ6, TLR 22 3.0, TLR 4.0 SR (soon),& 22T 3.0
"I'm too drunk to taste this chicken!", Col. Sanders
thecman26 is offline   Reply With Quote
Old 03-18-2008, 08:55 PM   #7
Tech Champion
 
Tony Newland's Avatar
 
Join Date: May 2005
Location: Utah
Posts: 5,764
Trader Rating: 50 (100%+)
Default

I think you could get the stock motor mount to work...maybe haf to drill a hole or two, noone makes a specific mount for that

OS makes a pipe for small blocks that would be alot better than a .21 pipe IMO, even most REVO pipes would fit nice

Also clutch parts may have to swapped, I dont know if the .18 has the same crank diameter as a .21 where the collet goes on

I'm thinking of doing the same thing this summer to experiment with.... its not a new idea... I know a few have ran them at the worlds and at the nitro challenge this year, it keeps popping up in pics from time to time so it must work well.
__________________
Schumacher Factory Team - Core RC - Highest Servos - Avid - Lunsford - Bellgate Distributors - Jconcepts - www.Prime-hobby.com - IRCR
Tony Newland is offline   Reply With Quote
Old 03-18-2008, 09:03 PM   #8
Tech Champion
 
thecman26's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jul 2006
Location: South Central Kansas
Posts: 7,685
Trader Rating: 98 (100%+)
Default

Hell yeah.. An .18 has the same crank.. I use a losi 4 shoe clutch on my .18 in the crt .5... The carb is a slide carb so that will work just fine in an 1/8th scale... Try the stock motor mount or get a quick change one that can be mounted forward or back... As for a pipe, a regular one might work so give it a try...
__________________
Chris Keen: Viola, Kansas
Kyosho RZ6, TLR 22 3.0, TLR 4.0 SR (soon),& 22T 3.0
"I'm too drunk to taste this chicken!", Col. Sanders
thecman26 is offline   Reply With Quote
Old 03-18-2008, 10:04 PM   #9
Tech Regular
 
Join Date: May 2007
Posts: 290
Trader Rating: 14 (100%+)
Default

No doubt. If I could save 10 to 15 seconds (easily given our pit setup at Boulder City Raceway, with 12 foot elevation change and speed bmps at the entrance and exit) It would be worth it. I currently have my OS Speed .21 turned down on the radio and fairly lean to make good fuel economy, with a .18 I might break into the 10-11 minute run mark, which would mean full qualifiers without a fuel stop. I wouldn't mind tearing up .18's because they are cheap.
Seyruuen is offline   Reply With Quote
Old 03-19-2008, 12:27 PM   #10
Tech Adept
 
TKCastle's Avatar
 
Join Date: May 2007
Posts: 118
Default

Quote:
Originally Posted by Seyruuen View Post
So I want to run a .18 in my RC8.

I know that several of the buggy nationals racers ran the .18 in qualifying, but have been unable to locate any information on what engine etc.

First: The engine mount, I was told it would require a special engine mount to run an .18. Who manufactures one for the RC8?

Second: Pipe and Header would likely need to be different due to the reduced flow that a .18 engine pushes through, what is a good match for an OS .18?

any information is appreciated, all of the threads on RCTech on this are dead ends.
Give this guy the RCTech member of the year award! Always wondered why 1/8 scale buggy drivers were using 21-28 high powered engines for medium to small scale tracks but was to afraid to ask why. Your out of the box thinking could really start something.
I can see it know......"Best .18 for my 1/8 buggy" thread.
__________________
Thats right!
TKCastle is offline   Reply With Quote
Old 03-19-2008, 12:38 PM   #11
Tech Elite
 
portyansky's Avatar
 
Join Date: Mar 2007
Posts: 2,979
Trader Rating: 54 (100%+)
Default

Ok, but you will be lacking the low end grunt. Why not just go with the OS .21vg and not deal with the hastles. I got 11 minutes on a tank of fuel when I had one in my truggy.
__________________
Team Tekno Canadian Team Manager
Team Hitec
portyansky is offline   Reply With Quote
Old 03-19-2008, 01:13 PM   #12
Tech Elite
 
Join Date: Oct 2004
Location: Michigan
Posts: 3,296
Trader Rating: 27 (100%+)
Default

I run one of these but an older version for indoor. Perfect for smaller tracks. I actually went to a 15 clutchbell for a little more bottom. And very cheap. Mines lasted quite well and is easy to tune. A little home porting on the sleeve and I get just under 15 minutes on a tank at normal temps. Took the tank plug out of my rc8 and I don't run an external fuel filter.
http://cgi.ebay.com/Megatech-SH-Engi...QQcmdZViewItem
jbrow1 is offline   Reply With Quote
Old 03-19-2008, 01:17 PM   #13
Tech Regular
 
rcboxer's Avatar
 
Join Date: Jan 2008
Location: Apple Valley, Ca.
Posts: 447
Trader Rating: 25 (100%+)
Send a message via Yahoo to rcboxer
Default

Could use small carb restrictors too to help out fuel economy.
rcboxer is offline   Reply With Quote
Old 03-19-2008, 02:04 PM   #14
Tech Regular
 
Join Date: May 2007
Posts: 290
Trader Rating: 14 (100%+)
Default

In my OS SPEED .21 I run the 7mm restrictor currently. I can stretch about 7.5 minutes on a ROAR legal 125cc tank. (they tech tank capacity here). if I could go 10:30 it would be worth doing, assuming it didn't kill my laptimes (more than 1 second slower appx to break even)
Seyruuen is offline   Reply With Quote
Old 03-19-2008, 02:23 PM   #15
Tech Addict
 
IanWright's Avatar
 
Join Date: Dec 2007
Location: If i'm not in England i'm in Southern California
Posts: 532
Trader Rating: 1 (100%+)
Send a message via AIM to IanWright
Default

when i want to turn it down the Picco .21 sport... 12+ minutes, low end grunt enough...


Testing yesterday we were getting 11.30 out of a Nova 5 port Turbo plug and the things are flying.

Going to see what we can get my RB doing with a restricter and a few tricks.

A .18 is an interesting idea, i would like to see it... if it went 15 minutes that would be real interesting.
IanWright is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
hyper7 shock questions and other questions buds302 Nitro Off-Road 1 06-10-2008 11:03 PM
B4: Kit vs RTR, Questions. BelialX13 Rookie Zone 15 02-14-2008 03:57 PM
kanai diff questions and other questions famous182 Electric Off-Road 2 02-25-2006 01:19 PM
TNX QUESTIONS chrometwanks Monster Trucks 2 02-03-2006 05:02 PM
TB questions nekmiyevo2 Electric On-Road 7 08-11-2005 08:37 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 07:10 AM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net