R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 08-21-2003, 03:01 PM   #46
Tech Elite
 
EdwardN's Avatar
 
Join Date: May 2003
Location: SoCal
Posts: 2,144
Trader Rating: 1 (100%+)
Default Re: Re: Re: Re: Where is everybody?

Quote:
Originally posted by Data
thanks for the reply, now i have more questions.

how would the shape and angle of the squish band affect the performance? As you said, the design of the squish band changes from engine to engine, but what is the general guide line the designer would follow ?
Ok, angle on sqish band is very iportant when we are talking about engine's aplication-on dragster-you will preferd to do 0, for RC racing 2-3 degrees and area will be around 65 %. Flat squish band is more difficult to control, but it will make more power and power will come up like somebody turn it in, with angled squish band it is much easier to control, but it will produce less power and engine performance will be smother. Also the clearance between piston and head is very important too-if it is too big-you most likely will have preignition and the temperature trnasfer from piston to the head will be lees and it will create detonation (sandblasting). In most of the cases people try to put more head gakets ( will create more difference in temperature and more detonation). In this case-use colder plug, or bigger volume botton.
__________________
DISCLAIMER: Since 90% of my posts may be BS, and since my posts may be either insanely idiotic, incoherent, and/or not even close to a rational thought, please accord my posts no more than 10% of credibility.
EdwardN is offline   Reply With Quote
Old 08-21-2003, 03:09 PM   #47
Tech Elite
 
EdwardN's Avatar
 
Join Date: May 2003
Location: SoCal
Posts: 2,144
Trader Rating: 1 (100%+)
Default

Quote:
Originally posted by fastharry
well,theres got to be some benefit(you would think).....but I'm curious as to the reason..shape,extra coil in the filament,takes up more cyl space for more compression....


I know they don't recommend them for off road use,as they are more fragile.....and harder to tune..

Hmmm..
The real benefit in that area is only to use all aluminum. I had mentioned before in other thred, platinum, which is part of filament, is ctalisator for burning process. We try to increase platinum area (plating the head) it didn't add any power. So after that we just end up with al glow heads. Compression-you mean compression ratio or compression itself? You got to be very carefull with compression ratio-only one-right one will work -too low-will lose power too much will loose plugs (overheating). Just right one wil work. I don't know real benefit of turbo plug, I have never seen them before and now, I didn't see so far any difference at all. May be there is some.
__________________
DISCLAIMER: Since 90% of my posts may be BS, and since my posts may be either insanely idiotic, incoherent, and/or not even close to a rational thought, please accord my posts no more than 10% of credibility.
EdwardN is offline   Reply With Quote
Old 08-21-2003, 03:31 PM   #48
Tech Elite
 
EdwardN's Avatar
 
Join Date: May 2003
Location: SoCal
Posts: 2,144
Trader Rating: 1 (100%+)
Default

This plug will give real benefit.
Attached Images
File Type: jpeg gloplug.jpeg (31.3 KB, 207 views)
__________________
DISCLAIMER: Since 90% of my posts may be BS, and since my posts may be either insanely idiotic, incoherent, and/or not even close to a rational thought, please accord my posts no more than 10% of credibility.
EdwardN is offline   Reply With Quote
Old 08-21-2003, 03:51 PM   #49
Tech Elite
 
fastharry™'s Avatar
 
Join Date: Sep 2001
Location: Mahwah, NJ.. USA!! ..... Home of http://www.fastharry.com
Posts: 2,846
Trader Rating: 4 (100%+)
Send a message via Skype™ to fastharry™
Default

Nice to have an RC conversation..


hope its not ruined 2 hours from now..
__________________
www.fastharry.com---search "fastharry" on facebook
See Fastharry in Super Nitro racing at the HPI CHALLENGE...
http://www.youtube.com/watch?v=jzo-cBEnE0c
fastharry™ is offline   Reply With Quote
Old 08-21-2003, 04:08 PM   #50
Tech Elite
 
EdwardN's Avatar
 
Join Date: May 2003
Location: SoCal
Posts: 2,144
Trader Rating: 1 (100%+)
Default

Quote:
Originally posted by fastharry
Nice to have an RC conversation..


hope its not ruined 2 hours from now..
Why it will? I don't see any reason to have it ruined (as long as nobody call me irrogant idiot)
__________________
DISCLAIMER: Since 90% of my posts may be BS, and since my posts may be either insanely idiotic, incoherent, and/or not even close to a rational thought, please accord my posts no more than 10% of credibility.
EdwardN is offline   Reply With Quote
Old 08-21-2003, 04:16 PM   #51
Tech Elite
 
fastharry™'s Avatar
 
Join Date: Sep 2001
Location: Mahwah, NJ.. USA!! ..... Home of http://www.fastharry.com
Posts: 2,846
Trader Rating: 4 (100%+)
Send a message via Skype™ to fastharry™
Default

no..its me they'll be after...

Watch..
__________________
www.fastharry.com---search "fastharry" on facebook
See Fastharry in Super Nitro racing at the HPI CHALLENGE...
http://www.youtube.com/watch?v=jzo-cBEnE0c
fastharry™ is offline   Reply With Quote
Old 08-21-2003, 04:36 PM   #52
Tech Elite
 
EdwardN's Avatar
 
Join Date: May 2003
Location: SoCal
Posts: 2,144
Trader Rating: 1 (100%+)
Default

Quote:
Originally posted by fastharry
no..its me they'll be after...

Watch..
What are you talking about? Who are they? Who cares if they exist? Who is going to stop me here or somewhere else? Are you kidding me? People come here to say something or ask question, or or share expirience, if somebody doesn't like it-it there problem and it means they are hiding something from people-I don't care if I open some secrets or so. I will say whatever I want to, about anyhting I want to.
__________________
DISCLAIMER: Since 90% of my posts may be BS, and since my posts may be either insanely idiotic, incoherent, and/or not even close to a rational thought, please accord my posts no more than 10% of credibility.
EdwardN is offline   Reply With Quote
Old 08-21-2003, 04:38 PM   #53
Tech Master
 
eddiethefish's Avatar
 
Join Date: Jun 2002
Location: Montebello, California
Posts: 1,658
Send a message via ICQ to eddiethefish
Default

Quote:
Originally posted by Top Gun 777
What are you talking about? Who are they? Who cares if they exist? Who is going to stop me here or somewhere else? Are you kidding me? People come here to say something or ask question, or or share expirience, if somebody doesn't like it-it there problem and it means they are hiding something from people-I don't care if I open some secrets or so. I will say whatever I want to, about anyhting I want to.
bravo!
eddiethefish is offline   Reply With Quote
Old 08-21-2003, 04:41 PM   #54
Tech Elite
 
AMGRacer's Avatar
 
Join Date: Oct 2001
Location: Brisbane, Australia
Posts: 3,939
Default

I have used both standard plugs and turbo plugs and I actually do think that there is a very slight performance difference with the turbo plug. BUT I think that it only becomes obvious when the engine becomes older.

On a standard head repeated plug removal and replacement wears the thread of the head down and it becomes a potential source for compression leakage. Similarly that stupid brass washer on the plug gets crushed and flattened out and alters the glow plug position slightly.

Turbo plugs seal the head chamber up really tight and always key into the right position. Also the actual face that goes into the chamber is much smaller meaning the shape of the chamber is less affected by the shape of the glowplug.

I have no scientific evidence to back this all up of course.
AMGRacer is offline   Reply With Quote
Old 08-21-2003, 04:42 PM   #55
Tech Master
 
modellor's Avatar
 
Join Date: Aug 2002
Location: Northern Ireland
Posts: 1,447
Default

Quote:
Originally posted by fastharry
and how does the shape of a TURBO plug help performance.....
The coning from what I am led to believe is just a better way of sealing the gap to stop leaks or loss of combustion like a standard square plug (hence the requirement of the washer). But due to the fact that the amount of outer material changes I guess it controls the amount of distance the most of the heat dissapates up through the plug to stop it from becoming damaged so quick and also provide a more controlled combustion rate.
modellor is offline   Reply With Quote
Old 08-21-2003, 04:48 PM   #56
Tech Elite
 
EdwardN's Avatar
 
Join Date: May 2003
Location: SoCal
Posts: 2,144
Trader Rating: 1 (100%+)
Default

Quote:
Originally posted by AMGRacer
I have used both standard plugs and turbo plugs and I actually do think that there is a very slight performance difference with the turbo plug. BUT I think that it only becomes obvious when the engine becomes older.

On a standard head repeated plug removal and replacement wears the thread of the head down and it becomes a potential source for compression leakage. Similarly that stupid brass washer on the plug gets crushed and flattened out and alters the glow plug position slightly.

Turbo plugs seal the head chamber up really tight and always key into the right position. Also the actual face that goes into the chamber is much smaller meaning the shape of the chamber is less affected by the shape of the glowplug.

I have no scientific evidence to back this all up of course.
This is looks like real difference between turbo and regular plug. But if you pay attencion to the turbo thred-you will know it is much finner. I think it is easier to damge it if some debry will get there-specialy aluminum-it will ruined in second, but I am not sure, it just seems for me like this. What I saw in a lot of engines-which is realy shoked me-a lot of people use head shims made out of cooper-I would never do it, only soft AL.
__________________
DISCLAIMER: Since 90% of my posts may be BS, and since my posts may be either insanely idiotic, incoherent, and/or not even close to a rational thought, please accord my posts no more than 10% of credibility.
EdwardN is offline   Reply With Quote
Old 08-21-2003, 04:58 PM   #57
Tech Elite
 
Francis M.'s Avatar
 
Join Date: Apr 2002
Location: Yorba Linda, CA
Posts: 4,719
Trader Rating: 2 (100%+)
Default

i'm not sure about this but the dome shape
in the button is designed to bring fuel and
air mixture as close to the center of the
glow plug if you go with a flat shaped button
the engine might not be as efficient due to
the nitro mixture will not be directed towards
the glow plug as for different designs ive
noticed that some modifiers make a cut
on the button on the side where to boost
port is or on the exhaust side on the button
but they do not try to change the cumbustion
shape just the edges to help flow i guess.
i would be carfull not too leave sharp edges
when doing this modification as it will retain
heat and could cause preignition sometime
when the engine gets up to temp.
__________________
TQ-racing Yokomo BD7 Airtronics
Francis M. is offline   Reply With Quote
Old 08-21-2003, 05:03 PM   #58
Tech Elite
 
AMGRacer's Avatar
 
Join Date: Oct 2001
Location: Brisbane, Australia
Posts: 3,939
Default

Quote:
Originally posted by Top Gun 777
This is looks like real difference between turbo and regular plug. But if you pay attencion to the turbo thred-you will know it is much finner. I think it is easier to damge it if some debry will get there-specialy aluminum-it will ruined in second, but I am not sure, it just seems for me like this. What I saw in a lot of engines-which is realy shoked me-a lot of people use head shims made out of cooper-I would never do it, only soft AL.
Yes the threads are much finer and I agree may get damaged easier. But the threads are not doing the sealing so it does not matter as much.

My plug threads are still OK at the moment, seems to be undamaged so far.
AMGRacer is offline   Reply With Quote
Old 08-21-2003, 05:07 PM   #59
Nitro Tech
 
dino.tw's Avatar
 
Join Date: Oct 2002
Location: I can drive!
Posts: 1,459
Default

Dear TOP GUN,

We all know that higher exhaust port can move the torque/rpm curve to the high-rpm zone.But we will lost some torque on the bottom and get instable idle.What do you think between high-rpm engine and high-torque engine?Whatever we can change the gear ratio for them to fit for the track.Which one is your favorite?

Thanks in advance.
dino.tw is offline   Reply With Quote
Old 08-21-2003, 05:16 PM   #60
Nitro Tech
 
dino.tw's Avatar
 
Join Date: Oct 2002
Location: I can drive!
Posts: 1,459
Default



There is a photo to explain the TURBO PLUG.It can fix the content of the combustion chamber no matter which brand's turbo plug using on your engine.The purpose is the same with TOP GUN's antique Rossi.
dino.tw is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
RB Engine Thread snowboardgeek1 Onroad Nitro Engine Zone 515 06-16-2017 11:28 AM
GRP... Engine... Thread... xlgraphicspro Offroad Nitro Engine Forum 2135 09-10-2013 09:46 AM
OS TR engine thread compaq888 Onroad Nitro Engine Zone 612 03-25-2006 05:55 AM
REX engine thread? factory racer Onroad Nitro Engine Zone 1 06-05-2005 10:42 AM
SH Engine thread ziggy12345 Onroad Nitro Engine Zone 12 02-14-2005 01:48 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 09:40 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