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Re:Fuel Additives Comparisons and Test
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TOPIC: Re:Fuel Additives Comparisons and Test
#324613
Ivan (User)
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Fuel Additives Comparisons and Test 3 Years, 11 Months ago  
This should information should help with comparing various fuel additive cleaners and how well they work.

Background about tests:

As a worst case sample of material which might be found in gasoline I used ordinary tar. The brown deposits we find coating carburators, and which collects in fuel injectors and on intake valves, are the highest boiling components in gasoline. They are tar-like materials which distilled along with the lighter gasoline. The best solvent I've ever seen for these was methylene chloride, but it's expensive and I'm sure it's being phased out to protect our ozone layer. In any case, if you used it on a modern car the chlorine freed during combustion would corrode the oxygen sensor. Amoco advertises a cleaner gasoline and I'm sure it's because they've reduced these tar-like compounds. All gas these days contains at least a little detergent of some sort to help keep these deposits from building up too much.

Dimethylformamide is listed in the literature as being a good engine cleaner and is "especially good at dissolving carbonaceous deposits". I haven't used this myself because it is a bit too toxic. Instead I used N-methyl pyrrolidone, which is also good.

For my tests, I tried to use a wide variety of products, well known and unknown, expensive and cheap, and also some pure solvents in order to represent a good cross section of products on the market. Note, carbon itself (such as soot and other thermally decomposed material) is not soluble in ANY solvent but solvents like dimethylformamide and N-methyl pyrrolidone do a good job of breaking up clumps and dispersing the fine particles to release the heavy tarry materials trapped within them. However, some of these solvents are too harsh to use freely in the fuel system. (Someone in one of these forums told me that when the auto industry looks for good cleaners, they mostly look for solvents that will not attack the plastic and rubber parts in the system.)

Most cleaners (the safer & slightly less effective ones) usually have common solvents in them like toluene, alcohol, acetone or methyl ethyl ketone, and naphtha. If you want to use these to clean your system, you can get more for your money by buying the pure solvents at a hardware store and mixing them yourself. I have never had a problem adding toluene, acetone, alcohol, or naphtha to my gas tank in quantities up to one quart per 16 gallons.

Most of the straight solvents I used are at least as flammable as gasoline so be careful if you use them. The alcohol used was pure, 100% isopropyl alcohol. This has no water in it, it is not the same as "rubbing alcohol".

These test results are as fairly and accurately done as I could manage with the equipment I had available, and the other data presented is also accurate to my knowledge. Your car may have different plastics in it than mine does so if you choose to make your own cleaner, do it at your own risk.

TEST RESULTS

RELATIVE EFFICIENCIES AT WHICH VARIOUS CLEANERS WILL DISSOLVE HIGH BOILING RESIDUES FROM GASOLINE AND CARBONACEOUS DEPOSITS FOUND IN USED MOTOR OIL, (10=BEST):

· 10 Gunk Gas Treatment
· 10 Toluene (a common ingredient)
· 9 Castrol Syntec Power System
· 8 Duralube Fuel System Cleaner
· 7 Gunk Fuel Injector Cleaner
· 6 Redline SI-1
· 5 Gunk Air Intake Cleaner
· 4 Naphtha (a common ingredient)
· 4 STP Fuel System Cleaner
· 4 Seafoam Motor Tuneup
· 4 Trak Fuel Injector Cleaner
· 4 STP Intake Valve Cleaner
· 4 CD-2 Emission Cure
· 4 Prolong Fuel System Treatment
· 3 CD-2 Fuel Injector Cleaner
· 3 Techron Concentrate
· 0.5 Butyl Cellosolve (a COMMONLY used "AUTO INDUSTRY DETERGENT" for oil and grease)

THE FOLLOWING CLEANERS DO NOT HURT NYLON (LISTED RANDOMLY).
(The letters in parentheses indicate how well they dissolved the material from used oil, A=best.):

· Toluene (A)
· 2-Phenoxyethanol (A)
· Duralube Fuel System Treatment (
· B-12 Chemtool (
· Trak Fuel Injector Cleaner (C)
· Techron Concentrate (D)
· STP Intake Valve Cleaner (E)
· Seafoam Motor Tuneup
· CD-2 Emission Cure
· Prolong Fuel System Treatment
· Aromatic distillates
· Naphtha
· Butyl cellosolve
· Acetone

THE FOLLOWING CLEANERS WILL DECOMPOSE THE NYLON SOCK IN THE FUEL TANK. Listed in order of increasing severity:

· STP Fuel System Treatment
· CD-2 Fuel Injector Cleaner
· Gunk Fuel Injector Cleaner
· Castrol Syntec Power System
· Redline SI-1
· Gunk Gas Treatment
· Monoethanolamine
(The monoethanolamine is the worst here. It turns nylon black on contact. It is significant to note here that the "best" "detergents" in use today are similar, strongly alkaline organic solvents). Another use for the current bunch of organic amine "detergents" is cleaning deposits out of cylinders, so I hear.

I hope this takes the guesswork out of choosing good products.
 
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Last Edit: 2010/11/25 04:20 By Ivan.
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#324618
greenpus (User)
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Re:Fuel Additives Comparisons and Test 3 Years, 11 Months ago  
Very well written. Did you do this yourself?
 
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#324621
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Re:Fuel Additives Comparisons and Test 3 Years, 11 Months ago  
Wow!! Thank you Ivan. That's alot of info and well put together.

I am impressed with your research.
 
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#364045
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Re:Fuel Additives Comparisons and Test 3 Years, 6 Months ago  
Great bunch of information Ivan - Thank you. Myself having spent most of my life as a polymer chemist/formulator, I have poored over this type of info for years.

One or two tidbits I can pass along from personal experience since my hobby has been building hot rod engines: 1) Toluene added at approximately 10% will raise octane usually around 5 to 7 points. Quite a few dirt-track racers in my neck of the woods have used this. 2) A mixture of 80/20 Toluene and iso- or ethyl- Alcohol has the same Kauri-Butanol (solvency rating) as MEK (methyl ethyl ketone) which is an ultimately excellent solvent. Too much so to be used on a regular basis in a non-custom built fuel system.

I mention this so as to inform the guys here that if you add Toluol(toluene) or xylol (xylene) for that matter into a gasoline which contains any form of alcohol you run the risk of dissolving an awful lot of various types of plastic or rubber. The long term effects could rapidly become expensive. I do this on all my vehicles once a year just to give them one good cleaning. But i buy nothing but premium non-ethanol fuel for the rest of the year. Ethanol adulterated fuels should be banished from the planet by the way.

For all you tinkerers out there, the next time you have to clean oil gunk and carbon from that nasty engine you have taken apart - 80/20 toluene/isopropanol will amaze you!

You CAN NOT add toluol to your fuel because the FEDS have not collected fuel tax on the toluol. Did you hear me? I didn't think so, most people choose to block that part out.
 
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#364089
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Re:Fuel Additives Comparisons and Test 3 Years, 6 Months ago  
Thanks,Ivan & Gib.
I missed this thread the first time around. Glad I caught it this time. Real good info here.
 
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#364114
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Re:Fuel Additives Comparisons and Test 3 Years, 6 Months ago  
IVAN,thanks for all your hard work,very helpfull and informative,was very surprised how ineffecitve chevrons techtron concentrat was as cleaning ,was suposed rto be good.

Anyway,looks to me like duralubes fuel system cleaner is the best cleaner that doesnt seen to disolve the sock in tank or other plastic /rubber/nylon parts in fuel system.

Gib,thanks for your experience with the chemical side of the cleaners and octane boost info too.

Scott
 
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#364212
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Re:Fuel Additives Comparisons and Test 3 Years, 6 Months ago  
scottw wrote:
IVAN,thanks for all your hard work,very helpfull and informative,was very surprised how ineffecitve chevrons techtron concentrat was as cleaning ,was suposed rto be good.

t

actually he copied it from this website.
http://www.automotiveforums.com/t54232-fuel_injector_cleaners_tests.html
 
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#364317
CoyoteManNo1 (User)
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Re:Fuel Additives Comparisons and Test 3 Years, 6 Months ago  
Thanks for he info IVAN. Ben trying to clean out the fuel system in the Road King and now I know what I should be using. Thank You.


W. Coyote
 
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#364351
hrdbrgn (User)
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Re:Fuel Additives Comparisons and Test 3 Years, 6 Months ago  
greenpus wrote:
scottw wrote:
IVAN,thanks for all your hard work,very helpfull and informative,was very surprised how ineffecitve chevrons techtron concentrat was as cleaning ,was suposed rto be good.

t

actually he copied it from this website.
http://www.automotiveforums.com/t54232-fuel_injector_cleaners_tests.html


there's always one.......anyway,good stuff Ivan
 
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#364397
old dog (User)
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Re:Fuel Additives Comparisons and Test 3 Years, 6 Months ago  
And it's 9 yrs old.

bill
 
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110 cu in., PR/JE 10.25:1 HC pistons, PR Cam, PR adjustable push rods, PR stage II ported heads (2mm oversize valves)
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