Thoughts on fuel Octane - Club700XX - Honda TRX700XX Forum
User Tag List

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 23 Old 11-08-2011, 09:19 AM Thread Starter
Senior Member
 
1dmbhonkey's Avatar
 
Join Date: Jun 2010
Location: Tamaroa, IL
Posts: 175
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thoughts on fuel Octane

I've recently read some post about fuel octane. Many stating that 93 octane is the min. for this motor. I personally have run 89 octane since the the day I brought it home (with no prolbems..ping exct. even with big three +cam), mostly because thats the highest I can get in my home town (Southern Illinois @ sea level). I do have access to 93 but its a 20 min drive. Anyway my thought is this.... would'nt you be better off running the LOWEST octane your engine could safely burn since the HIGHER octane fuel is actually harder to ingnite?? It seems to me that the only way to extract more power from higher octane fuel is to either add compression (I guess a cam could raise compression psi) or alter timing. Feel free to straighten me out...... comments are welcome.
1dmbhonkey is offline  
Sponsored Links
Advertisement
 
post #2 of 23 Old 11-08-2011, 10:11 AM
 
roadkill's Avatar
 
Join Date: Sep 2009
Location: San Freakshow
Posts: 1,888
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
If you can run a lower octane without ping and stuff... Then, it should be OK.

The higher the compression, the higher the octane needed. Higher octane fuels aren't harder to ignite, but they are more stable under higher compression... think of how diesel fuel fires. Lower octane fuels can pre-ignite (ping) under high compression... but higher octane can handle the high compression and not ignite FROM the compression like diesel fuel and lower octane fuels. But, when you add in the ethanol they mix with gas in the mid-west... ??

roadkill

x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x
"You lock the door and throw away the key. There's someone in my head, but it's not me."

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
R. Waters
x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x


roadkill is offline  
post #3 of 23 Old 11-08-2011, 10:53 AM
Sid
Senior Member
 
Join Date: Mar 2009
Location: Ridgecrest, Ca.
Posts: 1,031
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Living in California, I'm not sure what is done to the gasoline. I've used the lower octane with undesirable results. The 93 appears to work better in this machine. The manual says to use the higher rated fuel so I do it. I am at 2300 feet here and in the summer I noticed some pinging with the lower rated gasoline. Truly, with California changing from summer to winter blends (more or less oxygenators); it is hard to say how any vehicle can survive without reacting.
Sid
Sid is offline  
 
post #4 of 23 Old 11-08-2011, 11:13 AM Thread Starter
Senior Member
 
1dmbhonkey's Avatar
 
Join Date: Jun 2010
Location: Tamaroa, IL
Posts: 175
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I built a small block chevy several years back with 11.25 to 1 compression and cast iron heads..... had to run it on 93
1dmbhonkey is offline  
post #5 of 23 Old 11-08-2011, 11:20 AM
 
Red-N-BlackXX's Avatar
 
Join Date: Apr 2010
Location: E.Kentucky
Posts: 3,184
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
93 is readily available around me so that's what I use. Manual says premium fuel only and gas loses octain as it sits. So if my bike sits a couple months without riding. I put fresh gas in it.
Red-N-BlackXX is offline  
post #6 of 23 Old 11-08-2011, 12:27 PM
 
DL700's Avatar
 
Join Date: Jan 2011
Location: JUNCTION CITY, OR.
Posts: 790
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
on trails and roads u really wont see enough load or heat in the motor to detonate on 89 octane maybe even on 87, but put a really fat guy on the bike or put it in the sand where engine load greatly increases then u will have problems,... and the cost is A LOT MORE then just a FEW CENTS a gallon....Detonation will most likely run piston, cylinder head and cylinder...maybe even the rod...


on the contrary too high of octane will Hurt power(on low compression motors), the higher fuel octane will take longer to release the BTU energy thus suffering from higher rpm loss of performance...


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
DL700 is offline  
post #7 of 23 Old 11-08-2011, 05:38 PM
Senior Member
 
traitor08's Avatar
 
Join Date: May 2010
Posts: 821
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I always run 93 in all small engines.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
MY RIDES

Amish washing the buggy^^^^
traitor08 is offline  
post #8 of 23 Old 11-09-2011, 02:16 AM
Senior Member
 
AusTrx700xx's Avatar
 
Join Date: Oct 2010
Location: Broome, Western Australia
Posts: 258
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
We can't eveether 89here in Aus, our options are 91, 93 and 98, I'm stoked that for once Australia has acess to stuff that the U.S doesn't

All readyto roost thanks to
Mike at Quadparts.com.au
Bart at Pearl Coast Motorcycles
Team IMS imsproducts.com
George at MonsterLab Atv
Kimberly Motorcycles
Bj Network Consulting Australia
Minshull Mechanical Repairs

R.I.P Steve "Scuba" Hall 12th December 1988 - 5th December 2010

You are Greatly missed, cant wait to go riding with you again one day mate
AusTrx700xx is offline  
post #9 of 23 Old 11-09-2011, 06:48 AM
Senior Member
 
traitor08's Avatar
 
Join Date: May 2010
Posts: 821
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
We also have the option of 102 or 110 here


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
MY RIDES

Amish washing the buggy^^^^
traitor08 is offline  
post #10 of 23 Old 11-09-2011, 09:17 AM
Senior Member
 
09RappySE's Avatar
 
Join Date: Jul 2009
Location: norfolk,va
Posts: 505
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Quote:
Originally Posted by AusTrx700xx View Post
I'm stoked that for once Australia has acess to stuff that the U.S doesn't
I would'nt go that far.....I have access to 87,89,91,93,100,110,114 within 3 local stations.....

734 09 Raptor
Meglodon by Bo,KW springs, Web 4 Cam, 54mm TB, 105.5mm CP cylinder, 14:1 CP,Barkers Inframe,Dynatek Coil,PC V,Dynatek Programable ignition,CCP stabilizer,+5 swinger,Boss Noss Sys, Direct Drive Lock-up, KDS Evac valve,HID Light conversion,SPAL fan
Tuned by EHS Racing 78hp 55Tq
09RappySE is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Club700XX - Honda TRX700XX Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 On

 
For the best viewing experience please update your browser to Google Chrome