Recent Topics
Bill Cosby's sex assault case going to trial
by Mr Nice
12 minutes 10 seconds ago
This is one reason I prefer to do my own oil
by SirTanon
59 minutes 56 seconds ago
Recent discovery of SatbiliTrack failure Mode
by MolaKule
Today at 01:11 PM
Costco Insurance discountn going away?
by stockrex
Today at 12:56 PM
4 Wix Oil filters and 1 Mazda OEM AF (skyactiv)
by badtlc
Today at 12:48 PM
FYI, At&t Implements data caps today
by badtlc
Today at 12:12 PM
Top Tier Gasoline = only 5 miles more per tank?
by Hyde244
Today at 11:45 AM
Thoughts on buying a car with a rebuilt title?
by 7055
Today at 09:54 AM
bought used honda prelude sh, which motor oil
by h22rider
Today at 09:38 AM
REVIVE a 3 YEAR stored/maltreated battery?
by SumpChump
Today at 09:35 AM
5.0 Mustang & Napa Synthetic
by Camprunner
Today at 09:24 AM
Castrol Magnatec 5w-20 Observation
by AirgunSavant
Today at 09:11 AM
Newest Members
WeekendWarrior, emily, lex73, showstopr30, any_user
57966 Registered Users
Who's Online
91 registered (1JZ_E46, 69GTX, ag_ghost, 87sammy, alarmguy, adamrc, 9 invisible), 1996 Guests and 134 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
57966 Members
66 Forums
249347 Topics
4081131 Posts

Max Online: 2862 @ 07/07/14 03:10 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: 1797
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.
_________________________
2003 Saturn L 300 127,930 miles
2013 VW Passat TDI SE, 31,050 miles
2014 VW Jetta TDI SportWagen 16,870 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: 690
Loc: Georgia
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: 24947
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: 345
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: 690
Loc: Georgia
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