R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 03-29-2003, 08:48 PM   #16
Tech Addict
 
Join Date: Aug 2002
Location: Australia, wollongong
Posts: 740
Send a message via ICQ to V-One S
Default

the long pipe is for a short track modeller.

and a short pipe a long striaghter track.

short pipe just moves the power up the rev range.
long moves it down the rev range.
V-One S is offline   Reply With Quote
Old 03-29-2003, 08:57 PM   #17
Tech Regular
 
Old Skool's Avatar
 
Join Date: Nov 2001
Location: SF Bay Area
Posts: 342
Default Re: Re: Cutting the header for more top/low end?

Quote:
Originally posted by tennessee
Is it a 1-piece or 2-piece pipe

What car is it ?

What plug are you using ?

What fuel are you using ?
It doesn't matter, shortening the total exhaust tract length will shift the powerband upwards, regardless of car, plug or fuel type/brand/etc.
Old Skool is offline   Reply With Quote
Old 03-29-2003, 09:00 PM   #18
Tech Addict
 
Join Date: Aug 2002
Location: Australia, wollongong
Posts: 740
Send a message via ICQ to V-One S
Default

the rule normally to cutting is to mark out an area about 70ft-80ft long, maybe longer.

time the car going between the 2 marks from a standing start, then cut about 1/8 each run until there is no improvement in time.

if your time goes backwards, pull the exhaust about 1/16 through the coupler and then time again.

repeat until done.
V-One S is offline   Reply With Quote
Old 03-29-2003, 09:28 PM   #19
Tech Adept
 
tennessee's Avatar
 
Join Date: Jul 2002
Location: Arizona
Posts: 241
Default

Why not just have a pipe for long tracks and a pipe for short tracks

Most pipes are 1 piece these days spcificaly designed for long and short tracks

If you need more bottom end you might be able to fix that by adjusting you're clutch, top end change gears

Depending on what motor you run can have an effect on you're pipe choice also

Also engine tuning plays a big part

But hey if you want to goto the track and hack on a header while everyone else is running they're car then have at it
tennessee is offline   Reply With Quote
Old 03-29-2003, 09:34 PM   #20
Tech Adept
 
tennessee's Avatar
 
Join Date: Jul 2002
Location: Arizona
Posts: 241
Default Re: Re: Re: Cutting the header for more top/low end?

Quote:
Originally posted by Old Skool
It doesn't matter, shortening the total exhaust tract length will shift the powerband upwards, regardless of car, plug or fuel type/brand/etc.
Show me
tennessee is offline   Reply With Quote
Old 03-31-2003, 01:54 AM   #21
Tech Master
 
Im2lazy's Avatar
 
Join Date: Oct 2002
Location: Hawaii!
Posts: 1,967
Default

Quote:
Originally posted by tennessee
Why not just have a pipe for long tracks and a pipe for short tracks

Most pipes are 1 piece these days spcificaly designed for long and short tracks

If you need more bottom end you might be able to fix that by adjusting you're clutch, top end change gears

Depending on what motor you run can have an effect on you're pipe choice also

Also engine tuning plays a big part

But hey if you want to goto the track and hack on a header while everyone else is running they're car then have at it
I've had a pair of pipes and manifolds before at the track. However, since I race on only one track, it was just 'testing' to see which suited my purposes best.
Also, the length of the pipe/manifold combo is like adjust the midrange needle on a carb, however, it is easier to do. It doesn't do much, but its something to exploit if you have the time. It doesn't affect the car when it first engages the clutch, but it slightly affects acceleration from corners (or however you want it to affect your car).

The advantage between a pretty good length and the perfect length is very minimal, but certain manifolds are plainly too long, and so you have to alter the length in order to have a combo that is 'pretty good'. With one piece pipes, though, they are already 'pretty good' (or quite possibly 'very good') in the respect of their total length.

The reason I stick with two piece exhausts as opposed to one piece units is that I am more comfortable and acclimated to them. I always fear a one piece will pop apart (even though I know it is very unlikely). I feel safer with my 5mm thick coupler and hoseclamps keeping my exhaust system together, then with three springs keeping a onepiece together.
Im2lazy is offline   Reply With Quote
Old 03-31-2003, 02:08 AM   #22
Tech Apprentice
 
Join Date: Nov 2001
Posts: 98
Default

Are 'inline' pipes more likely to be damaged in a crash than regular pipes due to a (i assume) less flexible join? Also are different brand inline manifolds and pipes compatible with each other?
SHARP is offline   Reply With Quote
Old 03-31-2003, 02:35 AM   #23
Tech Addict
 
Join Date: Aug 2002
Location: Australia, wollongong
Posts: 740
Send a message via ICQ to V-One S
Default

Quote:
Im2Lazy:
I feel safer with my 5mm thick coupler and hoseclamps keeping my exhaust system together, then with three springs keeping a onepiece together.

WOAH, u got springs holding yours, like i only got a piece of rubber on the exhaust and then over onto the manifold,
now its meant to have cable ties, but the manifold is not flared, and it is no good trying to flare it as it will crack due to the fact it is cast iron,

lol
V-One S is offline   Reply With Quote
Old 03-31-2003, 03:13 AM   #24
Tech Prophet
 
InitialD's Avatar
 
Join Date: Feb 2002
Location: MORDOR
Posts: 19,679
Default

Quote:
Originally posted by SHARP
Are 'inline' pipes more likely to be damaged in a crash than regular pipes due to a (i assume) less flexible join? Also are different brand inline manifolds and pipes compatible with each other?
Funny as it seems but from what I have observed, I have personally never seen a car equipped with an inline pipe come into the pits to repair the joint in a middle of a race.

More often than not, cars that I see a lot come in to the pits to repair their pipe joints are cars equipped with the conventional 2 piece pipe join by a silicone coupler...

It's a bitch for the pit guy to try and get the pipes to join properly again because the pipes are damn hot to handle to begin with. It is almost certain that you'll be out of contention if you happen to run a 5 minute heat...
InitialD is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Cutting??? racing_jason Painting, Designs, Graphics and Photography 5 07-29-2008 09:48 PM
Conical header vs Std header - what's the difference? Sp Racer Onroad Nitro Engine Zone 13 07-24-2007 10:22 PM
cutting BayArea101 Painting, Designs, Graphics and Photography 11 01-30-2007 02:37 PM
cutting out??? Greenbox Onroad Nitro Engine Zone 3 09-25-2005 03:23 PM
my car keeps cutting out BoneHead Electric Off-Road 2 08-05-2004 06:06 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 09:44 AM.


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