Recent Topics
Yokohama Geolander A/T G015 or snow tires?
by sgc2c
03/23/17 06:39 PM
AutoCraft Gold made in Saudi Arabia? [censored]?
by friendly_jacek
03/23/17 06:29 PM
How do you curb your wheels?
by y_p_w
03/23/17 05:19 PM
Red Line oil
by endeavor to persevere
03/23/17 05:10 PM
Harley Syn 3
by endeavor to persevere
03/23/17 05:08 PM
Dress up pieces under my hood
by Ihatetochangeoil
03/23/17 04:33 PM
Fram Pro Filters Date Code? (Pics)
by KingCake
03/23/17 04:28 PM
Broken/dislogded suspension part
by RichardS
03/23/17 04:27 PM
Can atheroscleros be completely reversed?
by Ed_Flecko
03/23/17 04:11 PM
Royal Purple 5w30 Question.
by GumbyJarvis
03/23/17 04:05 PM
anyone ever use Starrett M1 oil?
by 2cool
03/23/17 04:03 PM
Anyone watch Schitt's Creek?
by grampi
03/23/17 03:26 PM
NAPA ProSelect 21358, 4,400 miles CUT OPEN
by car51
03/23/17 03:06 PM
Parts Plus PH 2876, 5,000 miles CUT OPEN
by car51
03/23/17 03:01 PM
Another fantastic Craigslist tire score!
by Drew99GT
03/23/17 01:35 PM
Is this mower safe to use?
by Atesz792
03/23/17 12:39 PM
We are Marshall
by HosteenJorje
03/23/17 12:18 PM
OCI on little used vehicle
by ALR
03/23/17 11:46 AM
hood adjusters/adjustment
s

by mjoekingz28
03/23/17 11:00 AM
Carquest Filters
by SavagePatch
03/23/17 10:42 AM
Newest Members
Skybolt, Enrike, gschabel, rdc0000, anthnson1
60943 Registered Users
Who's Online
91 registered (Bandito440, 2002 Maxima SE, asiancivicmaniac, 2KBMW, ag_ghost, 379KITTY, 12 invisible), 2282 Guests and 11 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
60943 Members
66 Forums
262696 Topics
4337058 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#1971410 - 07/31/10 05:34 PM MMO increases or decreases octane rating
jsap Offline


Registered: 07/22/10
Posts: 60
Loc: NorCal
Does MMO increase or decrease octane rating of gasoline?
_________________________
Beware of stealers

Top
#1971414 - 07/31/10 05:38 PM Re: MMO increases or decreases octane rating [Re: jsap]
Boomer Offline


Registered: 09/19/08
Posts: 1831
Loc: Pennsylvania
Most oily substances are linear hydrocarbons, statiscally speaking, and would therefore be of low octane rating. So I would put MMO in that category. However, if you follow the manfacturer's recs, it should not have a large affect.
_________________________
2013 VW Passat TDI SE, 42,100 miles
2017 VW Golf All Trak 1562 miles

Top
#1971417 - 07/31/10 05:42 PM Re: MMO increases or decreases octane rating [Re: Boomer]
Lethal1ty17 Offline


Registered: 07/01/10
Posts: 714
Loc: TX
technically yes they would, but to such a small degree that it is negligable. like the age old question of "does peeing in the ocean raise the sea level" yes, but to such a small degree that it doesnt matter.

i put an ounce or two of MMO in each tank of gas i get now.

Top
#1972128 - 08/01/10 02:40 PM Re: MMO increases or decreases octane rating [Re: Lethal1ty17]
jsap Offline


Registered: 07/22/10
Posts: 60
Loc: NorCal
I see, so it would lower octane, but only to the degree of [censored] in the ocean. :)

Well, I'm trying to add up the various factors on possible contributors to pre-ignition. So far, I have these two factors:

1. MMO, by decreasing octane rating
2. carbon buildup, by increasing compression

On an old engine like mine (Mercedes M119.982) that was designed with 10:1 compression ratio and has 170K miles on it, I would think then to use a step colder heat range on the spark plugs?

(Reading the plugs would be nice, but I've been top engine cleaning, so the plugs are not readable right now.)
_________________________
Beware of stealers

Top
#1972192 - 08/01/10 04:00 PM Re: MMO increases or decreases octane rating [Re: jsap]
demarpaint Offline


Registered: 07/03/05
Posts: 26982
Loc: NY
Incorrect timing can cause pre-ignition, so can carbon deposits on the valves, along with the wrong octane gas. Using MMO at the recommended dose isn't going to lower the octane. [censored] in the ocean pretty much sums up the effect on octane.

Have you tired very hot water via a vacuum line? That will get the carbon deposits out. Read up on it, it has been discussed several times on the site.
_________________________
God Bless Our Troops


Top
#1972226 - 08/01/10 04:51 PM Re: MMO increases or decreases octane rating [Re: demarpaint]
jsap Offline


Registered: 07/22/10
Posts: 60
Loc: NorCal
I've done water through pcv and brake booster, but the appearance of the piston is still the same. (Btw, I don't have any pre-ignition problems. I'm just looking for info for future reference.)

Regarding MMO, do you know the actual octane rating undiluted? Any quantitative info?


Edited by jsap (08/01/10 04:51 PM)
_________________________
Beware of stealers

Top
#1972848 - 08/02/10 09:25 AM Re: MMO increases or decreases octane rating [Re: jsap]
Jax_RX8 Offline


Registered: 12/13/06
Posts: 348
Loc: Northern VA, USA
This has been ask of Rich Kelly, Marvel Technical Director, and he has stated MMO is "Octane Neutral" in that it neither increases or decreases octane.

Top
#1973720 - 08/02/10 11:00 PM Re: MMO increases or decreases octane rating [Re: Jax_RX8]
SAATR Offline


Registered: 04/15/08
Posts: 109
Loc: Here
In the proper concentrations, it would have no measurable effect much like most (if not all) octane boosters.
_________________________
Time is an illusion, lunchtime doubly so

Top
#1974328 - 08/03/10 01:14 PM Re: MMO increases or decreases octane rating [Re: SAATR]
Lethal1ty17 Offline


Registered: 07/01/10
Posts: 714
Loc: TX
run some seafoam to clean off those exhaust valves, or try some more water, ignition is caused by hot spots in the cylinder and carbon buildup is very good at this.

Top