R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 11-27-2001, 10:40 PM   #1
Tech Initiate
 
FACTION95Si's Avatar
 
Join Date: Oct 2001
Location: Rancho Cucamonga, CA
Posts: 38
Send a message via ICQ to FACTION95Si Send a message via AIM to FACTION95Si
Default Middle Needle or Spray Bar Needle tuning tips?

Can someone explain to me how this needle works and the correct way to tune it? The only instructions that I have seen are to set it flush in the carb.
FACTION95Si is offline   Reply With Quote
Old 11-28-2001, 01:41 AM   #2
Tech Regular
 
ozzyNEOdriver's Avatar
 
Join Date: Oct 2001
Location: sydney,
Posts: 499
Default Re: Middle Needle or Spray Bar Needle tuning tips?

the brass needle should only realy be fooled around with if you have very high quality fuel. it adjusts the spray bar. this is the jet that the fuel comes out of. different positions means diferent response either down low or high end or mid range.

one turn of this screw equals something like 1 full turn of the low end. it is for fine tuning.

don't bother unless your fuel is like bbbbrand new. fuel that's been hanging around for a month or been in the sun during race day and heated itself up is probably already ruined if you are going to use it to tune the middle needle.
ozzyNEOdriver is offline   Reply With Quote
Old 11-28-2001, 03:46 AM   #3
Tech Elite
 
AMGRacer's Avatar
 
Join Date: Oct 2001
Location: Brisbane, Australia
Posts: 3,939
Default

Not sure about ozzys fuel theory. I am pretty loose with my fuel But he is right about the spray bar position. But basically the mid end needle effects the acceleration point from about 5-20 feet when you nail the throttle from a standstill. The first 5 feet are all low end, the next 15-20 are mid range then high end needle. Trying to feel the difference at partial throttle requires much more experience than I have so I never play with it on my engines. It can give you a bit more mid corner punch if done right.
AMGRacer is offline   Reply With Quote
Old 11-28-2001, 05:10 AM   #4
Tech Regular
 
ozzyNEOdriver's Avatar
 
Join Date: Oct 2001
Location: sydney,
Posts: 499
Default

the fuel thing was told to me by the hobby shop that i bought my rb from, (dei rossi hobbies). if you can find an utter engine tunning genius that could help you out at your local track then give it a go with thier assistance.
ozzyNEOdriver is offline   Reply With Quote
Old 11-28-2001, 03:24 PM   #5
Tech Elite
 
AMGRacer's Avatar
 
Join Date: Oct 2001
Location: Brisbane, Australia
Posts: 3,939
Default

Quote:
Originally posted by ozzyNEOdriver
the fuel thing was told to me by the hobby shop that i bought my rb from, (dei rossi hobbies). if you can find an utter engine tunning genius that could help you out at your local track then give it a go with thier assistance.
Yeah you are right, having fuel which has absorbed water is definately going to be bad. My experiences have been tho that leaving it in the sun all day at a race has never really seemed to affect the performance at all. I am sure leaving it for 6 months in heat or all day with no cap on would be bad.
AMGRacer is offline   Reply With Quote
Old 11-29-2001, 03:49 AM   #6
Tech Regular
 
ozzyNEOdriver's Avatar
 
Join Date: Oct 2001
Location: sydney,
Posts: 499
Default

i noticed just by putting my fuel in the boot of the car, once i get to the track the metho bottle i store it in is bloated. if i open it it hisses (gas comming out) this is either metho, which would end up making the fuel a fraction (very small) higher nitro content, or it is the nitro evaporating (='s lower nitro content obviously).

i always watch were i put the fuel. just incase.
ozzyNEOdriver is offline   Reply With Quote
Old 11-29-2001, 03:54 PM   #7
Tech Elite
 
Join Date: Aug 2001
Posts: 2,583
Default

ozzy

That's because the inside of the boot in your real car is hot and the air inside the bottle that was at "normal temp" expanded from the heat. Bet if you put the same bottle somewhere cold the fuel bottle would collapse.
Sydewynder is offline   Reply With Quote
Old 11-30-2001, 12:22 AM   #8
Tech Regular
 
ozzyNEOdriver's Avatar
 
Join Date: Oct 2001
Location: sydney,
Posts: 499
Default

Quote:
Originally posted by Sydewynder
ozzy

That's because the inside of the boot in your real car is hot and the air inside the bottle that was at "normal temp" expanded from the heat. Bet if you put the same bottle somewhere cold the fuel bottle would collapse.
yeah that;s true. my fuel bottle squeezes in sometimes.
ozzyNEOdriver is offline   Reply With Quote
Old 12-07-2001, 02:43 PM   #9
Tech Apprentice
 
Mad Max's Avatar
 
Join Date: Nov 2001
Posts: 63
Default

FACTION95Si did you ever get your RB working right?
Mad Max is offline   Reply With Quote
Old 12-12-2001, 11:19 AM   #10
Tech Initiate
 
FACTION95Si's Avatar
 
Join Date: Oct 2001
Location: Rancho Cucamonga, CA
Posts: 38
Send a message via ICQ to FACTION95Si Send a message via AIM to FACTION95Si
Default

Yes I got my RB running great! Its a beast of an engine. I just wanted to know about the middle needle so I could tune it perfectly.
FACTION95Si is offline   Reply With Quote
Old 12-22-2001, 01:19 PM   #11
zxt
Tech Regular
 
zxt's Avatar
 
Join Date: Aug 2001
Location: Manila
Posts: 294
Default I have a question

what needle?

I'm very new to nitro like 2 days old. On my OS .12 LD engine I can see 3 screws. One near the exhaust (I guess this is the top end) One just in line with the carb (idle screw?) and one tiny screw just right beside it with spring.

Now which is which?

Thanks
zxt is offline   Reply With Quote
Old 12-22-2001, 01:22 PM   #12
Tech Initiate
 
FACTION95Si's Avatar
 
Join Date: Oct 2001
Location: Rancho Cucamonga, CA
Posts: 38
Send a message via ICQ to FACTION95Si Send a message via AIM to FACTION95Si
Default

This is the Spray Bar Needle

If you go here http://www.rbproducts.com/rbww/faqrb/carbsetting.12.htm

That will explain and show you each of the needles on a Nova Rossi Style Slide Carb.
FACTION95Si is offline   Reply With Quote
Old 12-22-2001, 02:33 PM   #13
Tech Apprentice
 
Join Date: Oct 2001
Posts: 59
Default

The top one is main the one with spring is the idle. The other is low. On your engine there isn't a mid.
kyosho is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
That 3rd needle lowey79 Nitro Off-Road 8 07-01-2008 07:06 AM
2nd needle in new engine mebejammin Onroad Nitro Engine Zone 1 08-26-2007 03:39 PM
middle tuning needle? mrgsr Onroad Nitro Engine Zone 1 05-08-2007 03:36 AM
Mid range needle? Giuseppe Nitro On-Road 22 07-02-2005 06:05 AM
3 Needle Tuning Zizu Nitro On-Road 16 12-06-2003 10:59 PM



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 05:53 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net