Fuel octane question - Page 3 - Harley Davidson Forums

Notices
Sportster Models 883, 883 Custom, 1200 Custom, 883L, 1200L, 1200S, 1200 Roadster, XR1200, and the Nightster.
Sponsored by:
Sponsored by:

Fuel octane question

  #21  
Old 01-10-2019, 03:12 PM
John Harper
John Harper is offline
Elite HDF Member
Join Date: Dec 2011
Location: Carlsbad
Posts: 3,839
Thanked 198 Times in 169 Posts
Default

Originally Posted by handirifle View Post
Oh and I happened to notice the other day, on the Vance n Hines Fuel Pak III web site, they have a CA model of it that does not alter CARB specs, so pretty worthless IMHO. Unless I could snag one from elsewhere......
I got a mainjet from Dynojet in Nevada, but I had to go through the R&D group to get it. Sales would not send me one here in Kalifornia. I was considering having one shipped to my sister in MO, then have her ship it to me if they would not ship direct. I did pick up another one off Ebay a few weeks later. That might be an option for you on the FP3.

John
 

Last edited by John Harper; 01-10-2019 at 03:14 PM.
  #22  
Old 01-10-2019, 03:12 PM
mrhammer2u
mrhammer2u is offline
Road Warrior
Join Date: Jan 2017
Location: New Jersey
Posts: 1,649
Thanked 259 Times in 201 Posts
Default

Originally Posted by handirifle View Post
Yea I guess you do. LOL I only paid a little over 4K for my bike. Obviously didn"t buy it new. Only had 14K on it. Thought about a big twin to take momma on, but not sure how long of a ride she will want to take, and the sporty is fine for shorter rides.

mrhammer
I might just try lower octane gas and see whut huppens. I would hate to hear the dreaded ping. CA gas is like a box of chocolates, ya never know what you're gonna get. Humm, that is a catchy phrase, I ought to repeat it.
That's the beauty of the ping. If you hear it, change octane, problem solved. But to blow an extra 15% on fuel is just wasteful. You've seen those commercials with the 3 legged 1 eyed dogs. Sponsor one of them if you have enough money to go around.
 
  #23  
Old 01-10-2019, 03:25 PM
Kingglide549's Avatar
Kingglide549
Kingglide549 is offline
Elite HDF Member
Join Date: May 2018
Location: Viet Vet, crossroads
Posts: 4,078
Thanked 810 Times in 590 Posts
Default

To help answer the question on octaine and it has been mentioned.
A stock cam with a lean condition is a certain recipe for a lot of ping.
 
  #24  
Old 01-10-2019, 05:29 PM
Thumper26's Avatar
Thumper26
Thumper26 is offline
Outstanding HDF Member
Join Date: May 2005
Location: A barrier island in NJ
Posts: 3,111
Thanks: 0
Thanked 20 Times in 18 Posts
Default

Manual says to run "91 octane", so what's the question?
 
The Following User Says Thank You to Thumper26 For This Useful Post:
Kingglide549 (01-10-2019)
  #25  
Old 01-10-2019, 06:14 PM
mrhammer2u
mrhammer2u is offline
Road Warrior
Join Date: Jan 2017
Location: New Jersey
Posts: 1,649
Thanked 259 Times in 201 Posts
Default

Originally Posted by handirifle View Post
You cannot buy avgas here without it going into an aircraft. As mentioned 91 is the highest available here. Mine runs fine on the 91 I was simply wondering how guys with high compression bikes do it, but am learning there is more to it than just octane.

I doubt I would ever get to the point of upgrading my engine like that. Not really sure I need or want it. At 65+ I am mostly overvmy hot rod days. Power is nice when I want to pull a hill loaded heavy, but a lower gear is always available.
Nope. Just compression ratio. Your Toyota Corolla is happy on 87. Your Lambo is happy on 93. Don't have a Lambo,...don't have to worry about it...lol.

Purge all that "high performance" and "better mileage" crap from your memory bank. I had to purge it from mine as well. But don't try and explain it to your friends at the pump. They'll just think YOU'RE the nutty one.
 
  #26  
Old 01-10-2019, 09:17 PM
handirifle
handirifle is online now
Senior Rider
Thread Starter
Join Date: Sep 2018
Location: Somewhere out west
Posts: 473
Thanked 16 Times in 16 Posts
Default

Dont have a Corrolla or a Lambo so no need to worry about either. My bike does not run lean, that has been taken care of. I was merely asking a question about performance machines.

For the record, a LOT of other brands run as high as 11.5 CR on 91 octane, so there seems to be something to what mrhammer says. Not defending it or condeming it.
 
  #27  
Old 01-10-2019, 09:24 PM
handirifle
handirifle is online now
Senior Rider
Thread Starter
Join Date: Sep 2018
Location: Somewhere out west
Posts: 473
Thanked 16 Times in 16 Posts
Default

But for the record, my 2005 Honda Accord with a 3.0L V6 has a 10.0 CR and is designed for and runs perfectly (still after 230,000 miles) on 89 octane gas. It has 240hp and 212 torque and still runs like new. Never used anything but 89 in it either, and we bought it new.
 
  #28  
Old 01-10-2019, 09:27 PM
Madnss
Madnss is offline
Outstanding HDF Member
Join Date: Dec 2012
Location: river
Posts: 2,390
Thanked 167 Times in 113 Posts
Default

#oilthread lmao
 
The Following User Says Thank You to Madnss For This Useful Post:
IdahoHacker (01-10-2019)
  #29  
Old 01-10-2019, 09:39 PM
handirifle
handirifle is online now
Senior Rider
Thread Starter
Join Date: Sep 2018
Location: Somewhere out west
Posts: 473
Thanked 16 Times in 16 Posts
Default

Originally Posted by Thumper26 View Post
Manual says to run "91 octane", so what's the question?
Did you READ the first post? I was asking about high performance bikes.
 
  #30  
Old 01-10-2019, 09:48 PM
apache snow's Avatar
apache snow
apache snow is offline
Road Captain
Join Date: Sep 2017
Location: over the mountain
Posts: 723
Thanked 146 Times in 123 Posts
Default

I use 93 in my hot rod Sportster. Never a problem. Ever.
 

Thread Tools
Search this Thread
Featured Sponsors
Vendor Directory

Contact Us About Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

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.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: