RE: What Grade Of Gas Do You Use?

Harley Davidson Forum

Sponsors

Harley Davidson History

RE: What Grade Of Gas Do You Use?

Printable Version

Harley Davidson Forums >> General Harley Davidson Tech Forums >> Engine/Fuel/Intake/Exhaust >> RE: What Grade Of Gas Do You Use?

Page: << < prev 1 2 3 [4]

Harley Davidson Forums Sponsor

Engine/Fuel/Intake/Exhaust Sponsored by Russell Performance

[Poll]

What Grade Of Gas Do You Use?

Hi test only

  84% (1421)

Medium grade only

  6% (107)

Regular only

  4% (78)

Whatever I can get

  1% (20)

Doesn't matter to me

  1% (22)

Hi test -w- octane booster

  1% (22)

Special people-- 114-116 octane

  0% (11)

Total Votes : 1681

(last vote on : 5/19/2008 7:30:08 PM)
(Poll will run till: -- )

Login
Message << Older Topic   Newer Topic >>

RE: What Grade Of Gas Do You Use? - 2/28/2008 5:40:17 PM

bullin

Posts: 19
Joined: 6/11/2007
Status: offline I put a gallon or two of 100 gas in mine. They have it at the pump I fuel at. Usually put 93 in when traveling outside my area.

(in reply to juaniosa)

Post #: 121

RE: What Grade Of Gas Do You Use? - 2/29/2008 5:59:47 PM

mphamrick

Posts: 146
Joined: 2/9/2008
Status: offline I use 91 octane as recomended in owners manual. Have not found a pump with a higher octane in the town that I live in. Will have to try a higher octane when I come across one. As of now everything is A O kay.
08 Ultra
Vance & Hines Big Shots
Stage 1

(in reply to Spectrexx)

Post #: 122

RE: What Grade Of Gas Do You Use? - 3/11/2008 7:20:20 PM

rmruder

Posts: 21
Joined: 2/15/2007
Status: offline In my Duece, stock except for intake and pipes, I run 89. I was always told that running too high an octane level can actually be as damaging as too low due to an incomplete burn and also causing fouled plugs. The rule of thumb I was given is to run whatever octane level keeps the engine from knocking and going higher has no advantage and is actually not good. Premium by me is 93 and when I run it in my Duece, it actually seems to make my engine run worse..............My Road King has a 117" build at 10.8-1 compression, so only 93 for it. My Roadstar is recommended at 87 which is all I ever put in it, and it runs great. From what I have been told the basic principal is, lower compression-lower octane.........higher compression-higher octane. I don't know if there's a chart somewhere that says for "x" compression you should run "x" octane level, but it would be nice if there was. It's not about the money as nothing is too good for my Harleys......

Has anyone heard the same about "too high" an octane level? To show how inconsistent opinions are, I was always under the understanding that the higher the octane the slower the burn to allow for higher compression which makes sense to me. Here are some varied opinions I have read. If you check out the websites below the exerpt from an "expert" you will see the opposite that says higher octane-slower burn...............It only gets more confusing. Is there a chemist out there that knows the truth!

Higher octane = burns faster
Lower Octane = burns slower

Now do not mistake burn faster = more power

Like many people have said. Higher octane allows you to run higher compression or forced induction. Other than that you are wasting your money.

Here are also a couple of websites with info on octane levels:

http://en.wikipedia.org/wiki/Octane_rating

http://chemistry.about.com/gi/dynamic/offsite.htm?site=http://theserviceadvisor.com/octane.htm

http://chemistry.about.com/library/weekly/aabyb100401.htm

http://www.wisegeek.com/what-is-high-octane-fuel.htm

(in reply to juaniosa)

Post #: 123

RE: What Grade Of Gas Do You Use? - 3/13/2008 3:59:39 PM

wydopn231

Posts: 700
Joined: 4/10/2007
Status: offline Hey where di i check for 95% nitro 5% alcohol what kind of survey leaves dragracers out.And where do check for the nitrous added at 4500 rpm.Man guess the 91 octane in the old fart bike is only one i can mark

(in reply to Spectrexx)

Post #: 124

RE: What Grade Of Gas Do You Use? - 4/6/2008 11:33:44 PM

pear69

Posts: 9
Joined: 4/6/2008
Status: offline Ok, here's the deal with gasoline and octane. Gasoline is an extremely combustable--explosive--liquid. When it is compressed --as in the combustion chamber-- it can ignite spontainiously before the spark plug fires. This causes what we call a spark knock or a ping. If this happens while the piston is on the way up this is called detonation--the effects of which can be terminal to an engine. Octane is added to gasoline to reduce the spontanious ignition of gasoline under compression, so the spark plug can fire the fuel/air mixture. The lower the octane--the more chance of spontanious combustion--the higher the octane--the less chance of spontainious combustion; a higher octane % in gasoline actually reduces the explosiveness of the raw gasoline. The octane rating really depends on what the compression ratio of your engine is. A stock engine that has a 8.5 or 8.8 to 1 one will run great on 87 octane. Any compression ratio around 8.9 or 9.5 to 1 will need 89 or 91 octane. Any compression ratio higher than that need the highest octane you can get.. But remember--compression ratio is the determining factor in the octane debate. If your bike does not ping or detonate on 87 octane then it is just fine to run.
It is true that a higher octane gasoline will burn cooler and cleaner but it must be compressed accordingly to do so. If your engine does not have enough compression then you are waisting your money..

< Message edited by pear69 -- 4/6/2008 11:39:32 PM >

(in reply to wydopn231)

Post #: 125

RE: What Grade Of Gas Do You Use? - 5/17/2008 7:22:31 PM

jason628

Posts: 144
Joined: 5/15/2008
Status: offline Greetings,

Only BP Ultimate in mine! It's well worth the extra money you have to spend for it.

(in reply to HDF Tech)

Post #: 126

RE: What Grade Of Gas Do You Use? - 5/21/2008 5:07:25 PM

The Mayor

Posts: 8
Joined: 5/21/2008
Status: offline I run nothing but premium and right about now it's around $4.20 a gallon where I live in California.

In my humble opinion I think we should all be running Iraqi gas for free, seems to me it's already been paid for.

_____________________________

Always Packin a Pistol

http://profile.myspace.com/index.cfm?fuseaction=user.viewprofile&friendid=151481375

(in reply to jason628)

Post #: 127

RE: What Grade Of Gas Do You Use? - 5/24/2008 6:25:26 PM

themensh

Posts: 857
Joined: 8/19/2007
Status: online I didn't see a response on your 'what gas' poll that allowed for
what I do.
I fill up on high test, next tank refill regular. Next tank refill High, next tank regular.

Luckily, I live in a FLAT state (florida) so knocking while climbing a mountain does not come
into play.

(in reply to HDF Tech)

Post #: 128

RE: What Grade Of Gas Do You Use? - 5/26/2008 9:38:48 PM

jimmyroadking

Posts: 353
Joined: 5/20/2008
From: Ontario,Canada
Status: offline 91 octane works fine for me

_____________________________

Have a great ride!
`07 roadking
103c.i.

(in reply to Spectrexx)

Post #: 129

RE: What Grade Of Gas Do You Use? - 6/18/2008 2:35:41 PM

divertim

Posts: 28
Joined: 1/6/2007
Status: offline I run premium in mine

(in reply to jimmyroadking)

Post #: 130

RE: What Grade Of Gas Do You Use? - 6/21/2008 5:08:45 AM

olgoat

Posts: 59
Joined: 11/22/2007
From: Penna. Furnace, PA.
Status: offline Hi-test for me

_____________________________

2005 Road King Custom
Yellow Pearl
V&H exhaust

(in reply to Spectrexx)

Post #: 131

RE: What Grade Of Gas Do You Use? - 6/22/2008 1:53:27 AM

italfatboy

Posts: 103
Joined: 4/17/2007
Status: offline Only the best for my baby! Shell V-Power.

_____________________________

2007 White Gold Pearl Fatboy

(in reply to olgoat)

Post #: 132

RE: What Grade Of Gas Do You Use? - 6/22/2008 2:49:00 PM

chad peterson

Posts: 53
Joined: 1/9/2007
Status: offline My 95 is 10.5:1, and I run 91 octane. \\; Occansionally I''ll throw some 100 octane in there (not that it needs it), but it smells so good!

(in reply to Spectrexx)

Post #: 133

RE: What Grade Of Gas Do You Use? - 6/25/2008 4:12:07 PM

BurgerFlaggen

Posts: 9
Joined: 6/22/2008
Status: offline I get 110 octane from the pump, it''s purple and smells a bit like laquer thinner.
I''ll sometimes use the 100 octane (red in color) which is also at it''s own dedicated pump, but they both go for the same price of $6.49 per gallon.
I figure if I''m paying that much, may as well get the extra 10 octane.
I guess the real question is whether the fact that the 110 is leaded will do any harm to the engine.
I am emissions exempt and don''t have any related equipment at all on my bike.
This engine is running at 10.5:1 compression.

< Message edited by BurgerFlaggen -- 7/3/2008 6:38:21 PM >

_____________________________

Road King
110"
10.5:1 forged pistons
Roller rockers etc.
HSR45
Andrews EV72 cam
Accel 40k single fire coil
Dyna 2000i single fire ignition
Rhinehart true dual system
Rivera Primo racing clutch

(in reply to chad peterson)

Post #: 134

RE: What Grade Of Gas Do You Use? - 7/2/2008 3:45:16 PM

FEV

Posts: 30
Joined: 2/26/2007
Status: offline Always premium - better performance & efficiency.

(in reply to Spectrexx)

Post #: 135

Login OR Register now to post a reply to this forum topic.

Page: <<   < prev  1 2 3 [4]